shanxia2.0/backend/app/crud/crm/contract.py

"""CRM 合同 CRUD — 对照 CrmContractServiceImpl.java（列表/详情 P1）"""
from __future__ import annotations

import json
import math
import re
from collections import defaultdict
from datetime import date, datetime, timedelta
from decimal import Decimal, ROUND_HALF_UP
from typing import Any, Dict, List, Optional, Tuple

from sqlalchemy import func, or_
from sqlalchemy.orm import Query, Session

from app.core.utils import generate_uuid
from app.crud.crm.data_scope_helpers import apply_crm_owner_scope, ensure_crm_owner_row_in_scope, apply_crm_create_by_scope, ensure_crm_create_by_row_in_scope
from app.crud.crm.contact import get_contact
from app.crud.crm.contract_approval import (
    can_user_approve,
    create_approval_records,
    delete_pending_approvals,
)
from app.crud.crm.contract_product import (
    batch_insert_contract_products,
    delete_products_by_contract_id,
    list_contract_products,
)
from app.crud.crm.customer import get_customer
from app.crud.crm.invoice_info import list_invoice_info_by_customer
from app.crud.crm.product import resolve_product_id_for_quote_item
from app.crud.crm.quote import get_quote
from app.crud.crm.quote_product import list_quote_products
from app.crud.crm.supplier_info import get_supplier_info
from app.models.crm_models import (
    CrmContract,
    CrmContractApproval,
    CrmContractChange,
    CrmContractProductPriceTier,
    CrmContractTemplate,
    CrmOpportunity,
    CrmQuote,
)
from app.models.models import SysUser

_FMT = "%Y-%m-%d %H:%M:%S"

def _ensure_contract_in_scope(db: Session, row: CrmContract, user_info, tenant_no: str) -> None:
    ensure_crm_owner_row_in_scope(db, row, user_info, tenant_no, message="无权访问该合同")


def _get_contract_row_in_scope(
    db: Session,
    contract_id: str,
    *,
    tenant_no: str,
    user_info=None,
) -> CrmContract:
    row = get_contract_row(db, contract_id, tenant_no=tenant_no)
    if not row:
        raise ValueError("合同不存在")
    _ensure_contract_in_scope(db, row, user_info, tenant_no)
    return row


_DATE_FMT = "%Y-%m-%d"


def total_pages(total: int, page_size: int) -> int:
    if page_size <= 0:
        return 0
    return math.ceil(total / page_size)


def _decimal_value(value: Any, default: Decimal = Decimal("0")) -> Decimal:
    if value is None or value == "":
        return default
    if isinstance(value, Decimal):
        return value
    return Decimal(str(value))


def _parse_optional_date(value: Any) -> Optional[date]:
    if value is None:
        return None
    if isinstance(value, date) and not isinstance(value, datetime):
        return value
    if isinstance(value, datetime):
        return value.date()
    text = str(value).strip()
    if not text:
        return None
    for fmt in (_DATE_FMT, _FMT):
        try:
            return datetime.strptime(text, fmt).date()
        except ValueError:
            continue
    raise ValueError(f"日期格式无效: {text}")


def _parse_optional_datetime(value: Any) -> Optional[datetime]:
    if value is None:
        return None
    if isinstance(value, datetime):
        return value
    text = str(value).strip()
    if not text:
        return None
    for fmt in (_FMT, _DATE_FMT):
        try:
            return datetime.strptime(text, fmt)
        except ValueError:
            continue
    raise ValueError(f"日期时间格式无效: {text}")


def _get_field(data: dict, *keys: str, default=None):
    for key in keys:
        if key in data and data[key] is not None:
            return data[key]
    return default


def _resolve_user_display_name(db: Session, user_id: Optional[str]) -> str:
    uid = (user_id or "").strip()
    if not uid:
        return ""
    u = db.query(SysUser).filter(SysUser.id == uid, SysUser.del_flag == 0).first()
    if not u:
        return ""
    return (u.nick_name or u.user_no or "").strip()


def _is_blank(value: Any) -> bool:
    return value is None or str(value).strip() == ""


def _first_non_blank(*values: Any) -> str:
    for value in values:
        text = "" if value is None else str(value).strip()
        if text:
            return text
    return ""


def _get_default_invoice_info(db: Session, *, tenant_no: str, customer_id: str) -> Optional[dict]:
    rows = list_invoice_info_by_customer(db, tenant_no, customer_id)
    if not rows:
        return None
    for row in rows:
        if str(row.get("isDefault") or "").strip() == "1":
            return row
    return rows[0]


def _build_customer_address(customer: Any) -> str:
    if not customer:
        return ""
    address_parts = [
        _first_non_blank(getattr(customer, "province", "")),
        _first_non_blank(getattr(customer, "city", "")),
        _first_non_blank(getattr(customer, "district", "")),
        _first_non_blank(getattr(customer, "address", "")),
    ]
    return "".join([part for part in address_parts if part])


def _row_to_dict(row: CrmContract) -> Dict[str, Any]:
    """ORM → camelCase（单点真相）"""
    return {
        "id": row.id,
        "contractNo": row.contract_no or "",
        "contractName": row.contract_name or "",
        "customerId": row.customer_id or "",
        "customerName": row.customer_name or "",
        "opportunityId": row.opportunity_id or "",
        "quoteId": row.quote_id or "",
        "parentContractId": row.parent_contract_id or "",
        "renewalCount": row.renewal_count if row.renewal_count is not None else 0,
        "templateId": row.template_id or "",
        "contractTemplate": row.contract_template or "",
        "contactId": row.contact_id or "",
        "contactName": row.contact_name or "",
        "contactMobile": row.contact_mobile or "",
        "contractType": row.contract_type or "",
        "contractNature": row.contract_nature or "",
        "amount": float(row.amount) if row.amount is not None else 0.0,
        "currency": row.currency or "CNY",
        "taxRate": float(row.tax_rate) if row.tax_rate is not None else 0.0,
        "amountWithTax": float(row.amount_with_tax) if row.amount_with_tax is not None else 0.0,
        "status": row.status or "draft",
        "approvalStatus": row.approval_status or "",
        "signDate": row.sign_date.strftime(_DATE_FMT) if row.sign_date else "",
        "actualSignDate": row.actual_sign_date.strftime(_DATE_FMT) if row.actual_sign_date else "",
        "startDate": row.start_date.strftime(_DATE_FMT) if row.start_date else "",
        "endDate": row.end_date.strftime(_DATE_FMT) if row.end_date else "",
        "contractPeriod": row.contract_period,
        "performanceStatus": row.performance_status or "",
        "performanceRate": float(row.performance_rate) if row.performance_rate is not None else 0.0,
        "customerSatisfaction": row.customer_satisfaction,
        "approvalFlowId": row.approval_flow_id or "",
        "contractFile": row.contract_file or "",
        "attachmentFiles": row.attachment_files or "",
        "ownerUserId": row.owner_user_id or "",
        "ownerUserName": row.owner_user_name or "",
        "receivedAmount": float(row.received_amount) if row.received_amount is not None else 0.0,
        "unreceivedAmount": float(row.unreceived_amount) if row.unreceived_amount is not None else 0.0,
        "invoiceAmount": float(row.invoice_amount) if row.invoice_amount is not None else 0.0,
        "uninvoiceAmount": float(row.uninvoice_amount) if row.uninvoice_amount is not None else 0.0,
        "partyA": row.party_a or "",
        "partyAAddress": row.party_a_address or "",
        "partyAContact": row.party_a_contact or "",
        "partyAMobile": row.party_a_mobile or "",
        "partyALegalPerson": row.party_a_legal_person or "",
        "partyAAgent": row.party_a_agent or "",
        "partyAPhoneFax": row.party_a_phone_fax or "",
        "partyABank": row.party_a_bank or "",
        "partyAAccount": row.party_a_account or "",
        "supplierId": row.supplier_id or "",
        "settlementMethod": row.settlement_method or "",
        "partyB": row.party_b or "",
        "partyBAddress": row.party_b_address or "",
        "partyBContact": row.party_b_contact or "",
        "partyBMobile": row.party_b_mobile or "",
        "partyBLegalPerson": row.party_b_legal_person or "",
        "partyBAgent": row.party_b_agent or "",
        "partyBPhoneFax": row.party_b_phone_fax or "",
        "partyBBank": row.party_b_bank or "",
        "partyBAccount": row.party_b_account or "",
        "paymentTerms": row.payment_terms or "",
        "deliveryTerms": row.delivery_terms or "",
        "contractTerms": row.contract_terms or "",
        "invalidReason": row.invalid_reason or "",
        "invalidTime": row.invalid_time.strftime(_FMT) if row.invalid_time else "",
        "templateContent": row.template_content or "",
        "settlementClauseDrafts": row.settlement_clause_drafts or "",
        "createBy": row.create_by or "",
        "createTime": row.create_time.strftime(_FMT) if row.create_time else "",
        "updateBy": row.update_by or "",
        "updateTime": row.update_time.strftime(_FMT) if row.update_time else "",
        "remark": row.remark or "",
    }


def contract_row_to_dict(row: CrmContract) -> Dict[str, Any]:
    return _row_to_dict(row)


def _build_contract_filters(
    db: Session,
    q: Query,
    filters: dict,
    *,
    tenant_no: str,
) -> Query:
    """Java: buildQueryWrapper"""
    q = q.filter(CrmContract.tenant_no == tenant_no, CrmContract.del_flag == 0)

    contract_no = (_get_field(filters, "contract_no", "contractNo") or "").strip()
    contract_name = (_get_field(filters, "contract_name", "contractName") or "").strip()
    customer_name = (_get_field(filters, "customer_name", "customerName") or "").strip()

    if (
        contract_no
        and contract_name
        and customer_name
        and contract_no == contract_name == customer_name
    ):
        keyword = contract_no
        q = q.filter(
            or_(
                CrmContract.contract_no.like(f"%{keyword}%"),
                CrmContract.contract_name.like(f"%{keyword}%"),
                CrmContract.customer_name.like(f"%{keyword}%"),
            )
        )
    else:
        if contract_no:
            q = q.filter(CrmContract.contract_no.like(f"%{contract_no}%"))
        if contract_name:
            q = q.filter(CrmContract.contract_name.like(f"%{contract_name}%"))
        if customer_name:
            q = q.filter(CrmContract.customer_name.like(f"%{customer_name}%"))

    customer_id = (_get_field(filters, "customer_id", "customerId") or "").strip()
    if customer_id:
        q = q.filter(CrmContract.customer_id == customer_id)

    opportunity_id = (_get_field(filters, "opportunity_id", "opportunityId") or "").strip()
    if opportunity_id:
        q = q.filter(CrmContract.opportunity_id == opportunity_id)

    quote_id = (_get_field(filters, "quote_id", "quoteId") or "").strip()
    if quote_id:
        q = q.filter(CrmContract.quote_id == quote_id)

    contract_type = (_get_field(filters, "contract_type", "contractType") or "").strip()
    if contract_type:
        q = q.filter(CrmContract.contract_type == contract_type)

    status = (_get_field(filters, "status") or "").strip()
    if status:
        q = q.filter(CrmContract.status == status)

    exclude_status = (_get_field(filters, "exclude_status", "excludeStatus") or "").strip()
    if exclude_status:
        q = q.filter(CrmContract.status != exclude_status)

    approval_status = (_get_field(filters, "approval_status", "approvalStatus") or "").strip()
    if approval_status:
        q = q.filter(CrmContract.approval_status == approval_status)

    owner_user_id = (_get_field(filters, "owner_user_id", "ownerUserId") or "").strip()
    if owner_user_id:
        q = q.filter(CrmContract.owner_user_id == owner_user_id)

    pending_approval_user_id = (
        _get_field(filters, "pending_approval_user_id", "pendingApprovalUserId") or ""
    ).strip()
    if pending_approval_user_id:
        # 仅返回当前处于审批中且审批状态为待审批的合同，避免历史审批记录混入草稿/已审批数据
        q = q.filter(
            CrmContract.status == "approving",
            CrmContract.approval_status == "pending",
        )
        q = q.filter(
            CrmContract.id.in_(
                db.query(CrmContractApproval.contract_id)
                .filter(
                    CrmContractApproval.approver_id == pending_approval_user_id,
                    CrmContractApproval.approval_result == "pending",
                    CrmContractApproval.is_current == 1,
                    CrmContractApproval.del_flag == 0,
                )
                .distinct()
            )
        )

    approved_by_user_id = (
        _get_field(filters, "approved_by_user_id", "approvedByUserId") or ""
    ).strip()
    if approved_by_user_id:
        # 已审批列表应只看审批流已结束的合同，排除仍在审批中的记录
        q = q.filter(CrmContract.approval_status.in_(("approved", "rejected")))
        contract_ids = [
            cid
            for (cid,) in db.query(CrmContractApproval.contract_id)
            .filter(
                CrmContractApproval.approver_id == approved_by_user_id,
                CrmContractApproval.approval_result.in_(("approved", "rejected")),
                CrmContractApproval.del_flag == 0,
            )
            .distinct()
            .all()
            if cid
        ]
        if contract_ids:
            q = q.filter(CrmContract.id.in_(contract_ids))
        else:
            q = q.filter(CrmContract.id == "__none__")

    min_amount = _get_field(filters, "min_amount", "minAmount")
    if min_amount is not None and min_amount != "":
        q = q.filter(CrmContract.amount >= _decimal_value(min_amount))

    max_amount = _get_field(filters, "max_amount", "maxAmount")
    if max_amount is not None and max_amount != "":
        q = q.filter(CrmContract.amount <= _decimal_value(max_amount))

    sign_date_begin = _parse_optional_date(_get_field(filters, "sign_date_begin", "signDateBegin"))
    if sign_date_begin:
        q = q.filter(CrmContract.sign_date >= sign_date_begin)

    sign_date_end = _parse_optional_date(_get_field(filters, "sign_date_end", "signDateEnd"))
    if sign_date_end:
        q = q.filter(CrmContract.sign_date <= sign_date_end)

    begin_time = _parse_optional_datetime(_get_field(filters, "begin_time", "beginTime"))
    end_time = _parse_optional_datetime(_get_field(filters, "end_time", "endTime"))
    if begin_time and end_time:
        q = q.filter(CrmContract.create_time >= begin_time, CrmContract.create_time <= end_time)
    elif begin_time:
        q = q.filter(CrmContract.create_time >= begin_time)
    elif end_time:
        q = q.filter(CrmContract.create_time <= end_time)

    return q.order_by(CrmContract.create_time.desc())


def list_contracts(
    db: Session,
    tenant_no: str,
    *,
    page: int = 1,
    page_size: int = 10,
    filters: dict = None,
    current_user_id: str = None,
    user_info=None,
) -> Tuple[List[Dict[str, Any]], int]:
    """Java: queryPageList"""
    q = db.query(CrmContract)
    q = _build_contract_filters(db, q, filters or {}, tenant_no=tenant_no)
    if user_info:
        q = apply_crm_owner_scope(q, CrmContract, user_info, db, tenant_no)
    total = q.order_by(None).with_entities(func.count(CrmContract.id)).scalar() or 0
    page = max(1, page)
    page_size = min(max(1, page_size), 100)
    rows = q.offset((page - 1) * page_size).limit(page_size).all()
    result = [_row_to_dict(r) for r in rows]

    for item in result:
        if item.get("status") == "approving" and current_user_id:
            item["canApprove"] = can_user_approve(db, item["id"], current_user_id)
        else:
            item["canApprove"] = False
        if item.get("ownerUserId") and not item.get("ownerUserName"):
            item["ownerUserName"] = _resolve_user_display_name(db, item["ownerUserId"])
        if item.get("createBy") and not item.get("createByName"):
            item["createByName"] = _resolve_user_display_name(db, item["createBy"])

    return result, int(total)


def get_contract(
    db: Session,
    contract_id: str,
    *,
    tenant_no: str,
    current_user_id: str = None,
    user_info=None,
) -> Optional[Dict[str, Any]]:
    """Java: queryById"""
    row = (
        db.query(CrmContract)
        .filter(
            CrmContract.id == contract_id,
            CrmContract.tenant_no == tenant_no,
            CrmContract.del_flag == 0,
        )
        .first()
    )
    if not row:
        return None
    _ensure_contract_in_scope(db, row, user_info, tenant_no)

    detail = _row_to_dict(row)
    detail["createByName"] = _resolve_user_display_name(db, detail.get("createBy"))
    detail["updateByName"] = _resolve_user_display_name(db, detail.get("updateBy"))
    if detail.get("ownerUserId") and not detail.get("ownerUserName"):
        detail["ownerUserName"] = _resolve_user_display_name(db, detail["ownerUserId"])

    supplier_id = (detail.get("supplierId") or "").strip()
    supplier = None
    if supplier_id:
        supplier = get_supplier_info(db, supplier_id, tenant_no=tenant_no)
        if supplier:
            detail["supplierName"] = supplier.supplier_name or ""

    customer = None
    customer_id = (detail.get("customerId") or "").strip()
    if customer_id:
        customer = get_customer(db, customer_id)

    # 查询兜底：历史空数据按基础资料补展示，不改变原始库存量
    if supplier:
        if _is_blank(detail.get("partyA")):
            detail["partyA"] = _first_non_blank(getattr(supplier, "supplier_name", ""))
        if _is_blank(detail.get("partyAAddress")):
            detail["partyAAddress"] = _first_non_blank(getattr(supplier, "supplier_address", ""))
        if _is_blank(detail.get("partyALegalPerson")):
            detail["partyALegalPerson"] = _first_non_blank(getattr(supplier, "legal_person", ""))
        if _is_blank(detail.get("partyAAgent")):
            detail["partyAAgent"] = _first_non_blank(getattr(supplier, "agent", ""))
        if _is_blank(detail.get("partyAPhoneFax")):
            detail["partyAPhoneFax"] = _first_non_blank(getattr(supplier, "phone_fax", ""))
        if _is_blank(detail.get("partyABank")):
            detail["partyABank"] = _first_non_blank(getattr(supplier, "bank_name", ""))
        if _is_blank(detail.get("partyAAccount")):
            detail["partyAAccount"] = _first_non_blank(getattr(supplier, "bank_account", ""))

    if customer:
        inv = _get_default_invoice_info(db, tenant_no=tenant_no, customer_id=customer_id)
        if _is_blank(detail.get("partyB")):
            detail["partyB"] = _first_non_blank(
                inv.get("companyName") if inv else "",
                customer.customer_name,
            )
        if _is_blank(detail.get("partyBAddress")):
            detail["partyBAddress"] = _first_non_blank(
                inv.get("companyAddress") if inv else "",
                _build_customer_address(customer),
            )
        if _is_blank(detail.get("partyBContact")):
            detail["partyBContact"] = _first_non_blank(detail.get("contactName"))
        if _is_blank(detail.get("partyBMobile")):
            detail["partyBMobile"] = _first_non_blank(
                inv.get("phoneFax") if inv else "",
                detail.get("contactMobile"),
                customer.mobile,
                customer.telephone,
            )
        if _is_blank(detail.get("partyBLegalPerson")):
            detail["partyBLegalPerson"] = _first_non_blank(inv.get("legalRepresentative") if inv else "")
        if _is_blank(detail.get("partyBPhoneFax")):
            detail["partyBPhoneFax"] = _first_non_blank(
                inv.get("phoneFax") if inv else "",
                customer.telephone,
            )
        if _is_blank(detail.get("partyBBank")):
            detail["partyBBank"] = _first_non_blank(inv.get("bankName") if inv else "")
        if _is_blank(detail.get("partyBAccount")):
            detail["partyBAccount"] = _first_non_blank(inv.get("bankAccount") if inv else "")

    detail["products"] = list_contract_products(
        db,
        contract_id,
        tenant_no=tenant_no,
        include_price_tiers=True,
    )

    if current_user_id and detail.get("status") == "approving":
        detail["canApprove"] = can_user_approve(db, contract_id, current_user_id)
    else:
        detail["canApprove"] = False

    return detail


def get_contract_detail(
    db: Session,
    contract_id: str,
    *,
    tenant_no: str,
    current_user_id: str = None,
    user_info=None,
) -> Dict[str, Any]:
    detail = get_contract(
        db,
        contract_id,
        tenant_no=tenant_no,
        current_user_id=current_user_id,
        user_info=user_info,
    )
    if not detail:
        raise ValueError("合同不存在")
    return detail


def get_contract_row(
    db: Session,
    contract_id: str,
    *,
    tenant_no: str,
) -> Optional[CrmContract]:
    return (
        db.query(CrmContract)
        .filter(
            CrmContract.id == contract_id,
            CrmContract.tenant_no == tenant_no,
            CrmContract.del_flag == 0,
        )
        .first()
    )


def _get_supplier_short_name(db: Session, supplier_id: str, tenant_no: str) -> str:
    if not supplier_id:
        return "山峡"
    supplier = get_supplier_info(db, supplier_id, tenant_no=tenant_no)
    if not supplier:
        return "山峡"
    if (supplier.short_name or "").strip():
        return supplier.short_name.strip()
    if (supplier.supplier_name or "").strip():
        return supplier.supplier_name.strip()
    return "山峡"


def generate_contract_no(
    db: Session,
    tenant_no: str,
    *,
    supplier_id: str = None,
    sign_date: date = None,
) -> str:
    """Java: generateContractNo — {供方编码}/X-JT{yyyyMMdd}{3位序号}"""
    supplier_code = "SX"
    if supplier_id:
        supplier = get_supplier_info(db, supplier_id, tenant_no=tenant_no)
        if supplier and (supplier.supplier_code or "").strip():
            supplier_code = supplier.supplier_code.strip()

    date_to_use = sign_date or date.today()
    date_str = date_to_use.strftime("%Y%m%d")
    prefix = f"{supplier_code}/X-JT{date_str}"

    last = (
        db.query(CrmContract)
        .filter(
            CrmContract.tenant_no == tenant_no,
            CrmContract.del_flag == 0,
            CrmContract.contract_no.like(f"{prefix}%"),
        )
        .order_by(CrmContract.contract_no.desc())
        .first()
    )

    sequence = 1
    if last and last.contract_no and len(last.contract_no) >= len(prefix) + 3:
        try:
            sequence = int(last.contract_no[len(prefix) :]) + 1
        except ValueError:
            sequence = 1

    for retry in range(10):
        candidate = f"{prefix}{sequence + retry:03d}"
        exists = (
            db.query(CrmContract.id)
            .filter(CrmContract.contract_no == candidate, CrmContract.del_flag == 0)
            .first()
        )
        if not exists:
            return candidate

    raise ValueError("生成合同编号失败，请稍后重试")


def generate_contract_name(
    contract_no: str,
    contract_type: str,
    supplier_short_name: str,
    customer_short_name: str,
    user_contract_name: str = "",
) -> str:
    """Java: generateContractName"""
    if not (user_contract_name or "").strip():
        if contract_type in ("sale", "framework"):
            return f"{supplier_short_name}-{customer_short_name}（{contract_no}）"
        if contract_type == "purchase":
            return f"{customer_short_name}-{supplier_short_name}（{contract_no}）"
        return f"合同（{contract_no}）"

    cleaned = re.sub(r"（[^）]+）$", "", user_contract_name.strip())
    if f"（{contract_no}）" not in cleaned:
        return f"{cleaned}（{contract_no}）"
    return cleaned


def _validate_contract_type_and_products(data: dict) -> None:
    contract_type = (_get_field(data, "contract_type", "contractType") or "").strip()
    if contract_type in ("sale", "purchase", "framework"):
        products = _get_field(data, "products", "productList") or []
        if not products:
            raise ValueError("销售合同、采购合同或框架合同必须至少添加一个产品")


def _normalize_framework_contract_data(data: dict) -> None:
    if (_get_field(data, "contract_type", "contractType") or "").strip() != "framework":
        return
    data["amount"] = 0
    data["amountWithTax"] = 0
    products = _get_field(data, "products", "productList") or []
    for product in products:
        if isinstance(product, dict):
            product["price"] = 0
            product["subtotal"] = 0
            product["taxAmount"] = 0


def _validate_product_prices_by_contract_type(data: dict) -> None:
    contract_type = (_get_field(data, "contract_type", "contractType") or "").strip()
    if contract_type not in ("sale", "purchase"):
        return
    products = _get_field(data, "products", "productList") or []
    for product in products:
        price = _decimal_value(_get_field(product, "price"))
        subtotal = _decimal_value(_get_field(product, "subtotal"))
        if price < Decimal("0.01"):
            raise ValueError("销售/采购合同产品的含税单价必须大于0")
        if subtotal < Decimal("0.01"):
            raise ValueError("销售/采购合同产品的含税总价必须大于0")


def _validate_sale_purchase_contract_amount(data: dict) -> None:
    contract_type = (_get_field(data, "contract_type", "contractType") or "").strip()
    if contract_type not in ("sale", "purchase"):
        return
    amount = _decimal_value(_get_field(data, "amount"))
    if amount < Decimal("0.01"):
        raise ValueError("销售合同或采购合同的合同金额必须大于0")


def _resolve_contract_product_ids(
    db: Session,
    *,
    tenant_no: str,
    products: List[dict],
    user_id: str = None,
) -> None:
    for product in products:
        pid = resolve_product_id_for_quote_item(
            db,
            tenant_no=tenant_no,
            product_data=product,
            user_id=user_id,
        )
        product["productId"] = pid
        product["product_id"] = pid


def _calc_amount_with_tax(amount: Decimal, tax_rate: Decimal) -> Decimal:
    if tax_rate is None:
        tax_rate = Decimal("0")
    return amount * (Decimal("1") + tax_rate / Decimal("100"))


def _apply_contract_entity_fields(
    entity: CrmContract,
    data: dict,
    *,
    db: Session,
    tenant_no: str,
    user_id: str = None,
    is_create: bool = True,
) -> None:
    field_map = (
        (("contract_name", "contractName"), "contract_name"),
        (("customer_id", "customerId"), "customer_id"),
        (("customer_name", "customerName"), "customer_name"),
        (("opportunity_id", "opportunityId"), "opportunity_id"),
        (("quote_id", "quoteId"), "quote_id"),
        (("parent_contract_id", "parentContractId"), "parent_contract_id"),
        (("template_id", "templateId"), "template_id"),
        (("contract_template", "contractTemplate"), "contract_template"),
        (("contact_id", "contactId"), "contact_id"),
        (("contract_type", "contractType"), "contract_type"),
        (("contract_nature", "contractNature"), "contract_nature"),
        (("currency",), "currency"),
        (("performance_status", "performanceStatus"), "performance_status"),
        (("contract_file", "contractFile"), "contract_file"),
        (("attachment_files", "attachmentFiles"), "attachment_files"),
        (("owner_user_id", "ownerUserId"), "owner_user_id"),
        (("party_a", "partyA"), "party_a"),
        (("party_a_address", "partyAAddress"), "party_a_address"),
        (("party_a_contact", "partyAContact"), "party_a_contact"),
        (("party_a_mobile", "partyAMobile"), "party_a_mobile"),
        (("party_a_legal_person", "partyALegalPerson"), "party_a_legal_person"),
        (("party_a_agent", "partyAAgent"), "party_a_agent"),
        (("party_a_phone_fax", "partyAPhoneFax"), "party_a_phone_fax"),
        (("party_a_bank", "partyABank"), "party_a_bank"),
        (("party_a_account", "partyAAccount"), "party_a_account"),
        (("supplier_id", "supplierId"), "supplier_id"),
        (("settlement_method", "settlementMethod"), "settlement_method"),
        (("party_b", "partyB"), "party_b"),
        (("party_b_address", "partyBAddress"), "party_b_address"),
        (("party_b_contact", "partyBContact"), "party_b_contact"),
        (("party_b_mobile", "partyBMobile"), "party_b_mobile"),
        (("party_b_legal_person", "partyBLegalPerson"), "party_b_legal_person"),
        (("party_b_agent", "partyBAgent"), "party_b_agent"),
        (("party_b_phone_fax", "partyBPhoneFax"), "party_b_phone_fax"),
        (("party_b_bank", "partyBBank"), "party_b_bank"),
        (("party_b_account", "partyBAccount"), "party_b_account"),
        (("payment_terms", "paymentTerms"), "payment_terms"),
        (("delivery_terms", "deliveryTerms"), "delivery_terms"),
        (("contract_terms", "contractTerms"), "contract_terms"),
        (("template_content", "templateContent"), "template_content"),
        (("settlement_clause_drafts", "settlementClauseDrafts"), "settlement_clause_drafts"),
        (("remark",), "remark"),
        (("order_num", "orderNum"), "order_num"),
    )
    for keys, attr in field_map:
        val = _get_field(data, *keys)
        if val is not None:
            setattr(entity, attr, val)

    if _get_field(data, "amount") is not None:
        entity.amount = _decimal_value(_get_field(data, "amount"))
    if _get_field(data, "tax_rate", "taxRate") is not None:
        entity.tax_rate = _decimal_value(_get_field(data, "tax_rate", "taxRate"))
    if _get_field(data, "amount_with_tax", "amountWithTax") is not None:
        entity.amount_with_tax = _decimal_value(_get_field(data, "amount_with_tax", "amountWithTax"))
    elif entity.amount is not None and entity.tax_rate is not None:
        entity.amount_with_tax = _calc_amount_with_tax(entity.amount, entity.tax_rate)

    for date_key, attr in (
        (("sign_date", "signDate"), "sign_date"),
        (("actual_sign_date", "actualSignDate"), "actual_sign_date"),
        (("start_date", "startDate"), "start_date"),
        (("end_date", "endDate"), "end_date"),
    ):
        val = _get_field(data, *date_key)
        if val is not None:
            setattr(entity, attr, _parse_optional_date(val))

    if _get_field(data, "contract_period", "contractPeriod") is not None:
        entity.contract_period = int(_get_field(data, "contract_period", "contractPeriod"))
    if _get_field(data, "performance_rate", "performanceRate") is not None:
        entity.performance_rate = _decimal_value(_get_field(data, "performance_rate", "performanceRate"))
    if _get_field(data, "customer_satisfaction", "customerSatisfaction") is not None:
        entity.customer_satisfaction = int(_get_field(data, "customer_satisfaction", "customerSatisfaction"))
    if _get_field(data, "renewal_count", "renewalCount") is not None:
        entity.renewal_count = int(_get_field(data, "renewal_count", "renewalCount"))

    if is_create and not entity.status:
        entity.status = "draft"
    if entity.status == "draft":
        entity.approval_status = None

    customer_id = (entity.customer_id or "").strip()
    customer = None
    if customer_id:
        customer = get_customer(db, customer_id)
        if customer and tenant_no and customer.tenant_no != tenant_no:
            raise ValueError("客户不存在")
        if customer:
            entity.customer_name = customer.customer_name or entity.customer_name or ""

    if entity.contact_id:
        contact = get_contact(db, entity.contact_id)
        if contact:
            entity.contact_name = contact.contact_name or entity.contact_name or ""
            entity.contact_mobile = contact.mobile or entity.contact_mobile or ""

    owner_id = (entity.owner_user_id or user_id or "").strip()
    if owner_id:
        entity.owner_user_id = owner_id
        entity.owner_user_name = _resolve_user_display_name(db, owner_id)

    supplier = None
    supplier_id = (entity.supplier_id or "").strip()
    if supplier_id:
        supplier = get_supplier_info(db, supplier_id, tenant_no=tenant_no)

    # 后端兜底：当新增/编辑未显式传入供需方信息时，按供应商与客户基础资料补齐，避免写入空数据
    if supplier:
        if _is_blank(entity.party_a):
            entity.party_a = _first_non_blank(getattr(supplier, "supplier_name", ""))
        if _is_blank(entity.party_a_address):
            entity.party_a_address = _first_non_blank(getattr(supplier, "supplier_address", ""))
        if _is_blank(entity.party_a_legal_person):
            entity.party_a_legal_person = _first_non_blank(getattr(supplier, "legal_person", ""))
        if _is_blank(entity.party_a_agent):
            entity.party_a_agent = _first_non_blank(getattr(supplier, "agent", ""))
        if _is_blank(entity.party_a_phone_fax):
            entity.party_a_phone_fax = _first_non_blank(getattr(supplier, "phone_fax", ""))
        if _is_blank(entity.party_a_bank):
            entity.party_a_bank = _first_non_blank(getattr(supplier, "bank_name", ""))
        if _is_blank(entity.party_a_account):
            entity.party_a_account = _first_non_blank(getattr(supplier, "bank_account", ""))

    if customer:
        inv = _get_default_invoice_info(db, tenant_no=tenant_no, customer_id=customer_id)
        if _is_blank(entity.party_b):
            entity.party_b = _first_non_blank(
                inv.get("companyName") if inv else "",
                customer.customer_name,
            )
        if _is_blank(entity.party_b_address):
            entity.party_b_address = _first_non_blank(
                inv.get("companyAddress") if inv else "",
                _build_customer_address(customer),
            )
        if _is_blank(entity.party_b_contact):
            entity.party_b_contact = _first_non_blank(entity.contact_name)
        if _is_blank(entity.party_b_mobile):
            entity.party_b_mobile = _first_non_blank(
                inv.get("phoneFax") if inv else "",
                entity.contact_mobile,
                customer.mobile,
                customer.telephone,
            )
        if _is_blank(entity.party_b_legal_person):
            entity.party_b_legal_person = _first_non_blank(inv.get("legalRepresentative") if inv else "")
        if _is_blank(entity.party_b_phone_fax):
            entity.party_b_phone_fax = _first_non_blank(
                inv.get("phoneFax") if inv else "",
                customer.telephone,
            )
        if _is_blank(entity.party_b_bank):
            entity.party_b_bank = _first_non_blank(inv.get("bankName") if inv else "")
        if _is_blank(entity.party_b_account):
            entity.party_b_account = _first_non_blank(inv.get("bankAccount") if inv else "")

    received = entity.received_amount if entity.received_amount is not None else Decimal("0")
    invoice = entity.invoice_amount if entity.invoice_amount is not None else Decimal("0")
    amount = entity.amount if entity.amount is not None else Decimal("0")
    entity.received_amount = received
    entity.invoice_amount = invoice
    entity.unreceived_amount = amount - received
    entity.uninvoice_amount = amount - invoice


def create_contract(
    db: Session,
    *,
    tenant_no: str,
    data: dict,
    user_id: str = None,
    dept_id: str = "",
) -> Dict[str, Any]:
    """Java: insertByBo"""
    products = _get_field(data, "products", "productList") or []
    if not isinstance(products, list):
        raise ValueError("产品明细格式无效")
    product_rows = [dict(p) for p in products]

    _validate_contract_type_and_products(data)
    _normalize_framework_contract_data(data)
    _validate_product_prices_by_contract_type(data)
    _validate_sale_purchase_contract_amount(data)

    customer_id = (_get_field(data, "customer_id", "customerId") or "").strip()
    if not customer_id:
        raise ValueError("客户ID不能为空")

    supplier_id = (_get_field(data, "supplier_id", "supplierId") or "").strip() or None
    supplier_short_name = _get_supplier_short_name(db, supplier_id or "", tenant_no)
    contract_type = (_get_field(data, "contract_type", "contractType") or "sale").strip() or "sale"
    sign_date = _parse_optional_date(_get_field(data, "sign_date", "signDate")) or date.today()

    contract_no = (_get_field(data, "contract_no", "contractNo") or "").strip()
    if not contract_no:
        contract_no = generate_contract_no(db, tenant_no, supplier_id=supplier_id, sign_date=sign_date)

    customer = get_customer(db, customer_id)
    customer_short_name = (customer.short_name or "") if customer else ""
    user_contract_name = (_get_field(data, "contract_name", "contractName") or "").strip()
    contract_name = generate_contract_name(
        contract_no, contract_type, supplier_short_name, customer_short_name, user_contract_name
    )

    now = datetime.now()
    entity = CrmContract(
        id=generate_uuid(),
        contract_no=contract_no,
        contract_name=contract_name,
        customer_id=customer_id,
        status="draft",
        contract_type=contract_type,
        amount=_decimal_value(_get_field(data, "amount")),
        tax_rate=_decimal_value(_get_field(data, "tax_rate", "taxRate"), Decimal("6.00")),
        currency=_get_field(data, "currency") or "CNY",
        sign_date=sign_date,
        tenant_no=tenant_no,
        create_by=user_id,
        create_dept_id=dept_id or "",
        create_time=now,
        update_by=user_id,
        update_time=now,
        del_flag=0,
        received_amount=Decimal("0"),
        invoice_amount=Decimal("0"),
    )
    _apply_contract_entity_fields(
        entity, data, db=db, tenant_no=tenant_no, user_id=user_id, is_create=True
    )
    entity.contract_no = contract_no
    entity.contract_name = contract_name

    _resolve_contract_product_ids(db, tenant_no=tenant_no, products=product_rows, user_id=user_id)
    db.add(entity)
    db.flush()

    if product_rows:
        batch_insert_contract_products(
            db,
            tenant_no=tenant_no,
            contract_id=entity.id,
            products=product_rows,
            contract_type=contract_type,
            user_id=user_id,
            dept_id=dept_id,
        )

    db.commit()
    db.refresh(entity)
    return get_contract_detail(db, entity.id, tenant_no=tenant_no)


def update_contract(
    db: Session,
    contract_id: str,
    *,
    tenant_no: str,
    data: dict,
    user_id: str = None,
    dept_id: str = "",
    user_info=None,
) -> Dict[str, Any]:
    """Java: updateByBo"""
    old = _get_contract_row_in_scope(db, contract_id, tenant_no=tenant_no, user_info=user_info)
    if not old:
        raise ValueError("合同不存在")
    if old.status != "draft":
        raise ValueError("只有草稿状态的合同才能修改")

    products = _get_field(data, "products", "productList")
    product_rows = [dict(p) for p in products] if products is not None else None

    work_data = dict(data)
    if product_rows is not None:
        work_data["products"] = product_rows
    _validate_contract_type_and_products(work_data)
    _normalize_framework_contract_data(work_data)
    _validate_product_prices_by_contract_type(work_data)
    _validate_sale_purchase_contract_amount(work_data)

    contract_type = (_get_field(data, "contract_type", "contractType") or old.contract_type or "sale").strip()
    old.contract_type = contract_type
    old.approval_status = None

    _apply_contract_entity_fields(
        old, data, db=db, tenant_no=tenant_no, user_id=user_id, is_create=False
    )

    if product_rows is not None:
        _resolve_contract_product_ids(db, tenant_no=tenant_no, products=product_rows, user_id=user_id)

    supplier_short_name = _get_supplier_short_name(db, old.supplier_id or "", tenant_no)
    customer = get_customer(db, old.customer_id) if old.customer_id else None
    customer_short_name = (customer.short_name or "") if customer else (old.customer_name or "")
    user_name = (_get_field(data, "contract_name", "contractName") or old.contract_name or "").strip()
    old.contract_name = generate_contract_name(
        old.contract_no or "",
        contract_type,
        supplier_short_name,
        customer_short_name,
        user_name,
    )

    old.update_by = user_id
    old.update_time = datetime.now()
    db.flush()

    if product_rows is not None:
        delete_products_by_contract_id(db, contract_id)
        if product_rows:
            batch_insert_contract_products(
                db,
                tenant_no=tenant_no,
                contract_id=contract_id,
                products=product_rows,
                contract_type=contract_type,
                user_id=user_id,
                dept_id=dept_id,
            )

    db.commit()
    return get_contract_detail(db, contract_id, tenant_no=tenant_no)


def soft_delete_contracts(
    db: Session,
    contract_ids: List[str],
    *,
    tenant_no: str,
    validate: bool = True,
    user_info=None,
) -> int:
    """Java: deleteWithValidByIds — 软删除"""
    count = 0
    for cid in contract_ids:
        entity = _get_contract_row_in_scope(db, cid, tenant_no=tenant_no, user_info=user_info)
        if not entity:
            continue
        if validate and entity.status != "draft":
            raise ValueError("只能删除草稿状态的合同")
        entity.del_flag = 1
        entity.update_time = datetime.now()
        count += 1
    db.commit()
    return count


def _parse_letter_oss_ids_from_tier(tier: CrmContractProductPriceTier) -> List[str]:
    letter_ids: List[str] = []
    raw = (tier.letter_oss_ids or "").strip()
    if raw:
        try:
            parsed = json.loads(raw)
            if isinstance(parsed, list):
                letter_ids = [str(x).strip() for x in parsed if str(x).strip()]
            elif parsed:
                letter_ids = [str(parsed).strip()]
        except json.JSONDecodeError:
            letter_ids = [part.strip() for part in raw.split(",") if part.strip()]
    single = (tier.letter_oss_id or "").strip()
    if single and single not in letter_ids:
        letter_ids.append(single)
    return letter_ids


def validate_framework_contract_for_submit_approval(
    db: Session,
    contract_id: str,
    *,
    tenant_no: str,
    contract: CrmContract = None,
) -> None:
    """Java: validateFrameworkContractForSubmitApproval"""
    entity = contract or get_contract_row(db, contract_id, tenant_no=tenant_no)
    if not entity:
        raise ValueError("合同不存在")
    if (entity.contract_type or "").strip() != "framework":
        return

    products = list_contract_products(db, contract_id, tenant_no=tenant_no)
    if not products:
        raise ValueError("框架合同必须维护产品明细")

    tiers = (
        db.query(CrmContractProductPriceTier)
        .filter(
            CrmContractProductPriceTier.contract_id == contract_id,
            CrmContractProductPriceTier.tenant_no == tenant_no,
            CrmContractProductPriceTier.del_flag == 0,
        )
        .all()
    )
    by_product: Dict[str, List[CrmContractProductPriceTier]] = defaultdict(list)
    for tier in tiers:
        by_product[tier.contract_product_id].append(tier)

    for prod in products:
        product_name = prod.get("productName") or "产品"
        tier_list = by_product.get(prod.get("id") or "", [])
        if not tier_list:
            raise ValueError(f"框架合同产品「{product_name}」至少维护一条调价区间（含调价函）")
        for tier in tier_list:
            if not tier.start_date or not tier.end_date:
                raise ValueError(f"框架合同产品「{product_name}」调价区间日期不能为空")
            if tier.start_date > tier.end_date:
                raise ValueError(f"框架合同产品「{product_name}」调价开始日期不能晚于结束日期")
            if tier.price is None or _decimal_value(tier.price) <= Decimal("0"):
                raise ValueError(f"框架合同产品「{product_name}」调价含税单价必须大于0")
            if not _parse_letter_oss_ids_from_tier(tier):
                raise ValueError(f"框架合同产品「{product_name}」每条调价区间须上传调价函附件")


def submit_contract_approval(
    db: Session,
    contract_id: str,
    *,
    tenant_no: str,
    approver_ids: List[str] = None,
    remark: str = "",
    user_id: str = None,
    dept_id: str = "",
    user_info=None,
) -> bool:
    """Java: submitApproval"""
    entity = _get_contract_row_in_scope(db, contract_id, tenant_no=tenant_no, user_info=user_info)
    if not entity:
        raise ValueError("合同不存在")
    if entity.status != "draft":
        raise ValueError("只有草稿状态的合同才能提交审批")

    validate_framework_contract_for_submit_approval(
        db, contract_id, tenant_no=tenant_no, contract=entity
    )

    entity.status = "approving"
    entity.approval_status = "pending"
    if remark:
        entity.remark = remark
    entity.update_time = datetime.now()
    db.flush()

    if approver_ids:
        create_approval_records(
            db,
            tenant_no=tenant_no,
            contract_id=contract_id,
            approver_ids=approver_ids,
            user_id=user_id,
            dept_id=dept_id,
        )

    db.commit()
    return True


def batch_submit_contract_approval(
    db: Session,
    contract_ids: List[str],
    *,
    tenant_no: str,
    approver_ids: List[str] = None,
    remark: str = "",
    user_id: str = None,
    dept_id: str = "",
    user_info=None,
) -> int:
    """Java: batchSubmitApproval"""
    success = 0
    for cid in contract_ids:
        try:
            submit_contract_approval(
                db,
                cid,
                tenant_no=tenant_no,
                approver_ids=approver_ids,
                remark=remark,
                user_id=user_id,
                dept_id=dept_id,
            )
            success += 1
        except ValueError:
            continue
    return success


def withdraw_contract_approval(
    db: Session,
    contract_id: str,
    *,
    tenant_no: str,
    remark: str = "",
    user_id: str = None,
    user_info=None,
) -> bool:
    """Java: withdrawApproval"""
    entity = _get_contract_row_in_scope(db, contract_id, tenant_no=tenant_no, user_info=user_info)
    if not entity:
        raise ValueError("合同不存在")
    if entity.status != "approving":
        raise ValueError("只有审批中的合同才能撤回")

    entity.status = "draft"
    entity.approval_status = None
    if remark:
        entity.remark = remark
    entity.update_by = user_id
    entity.update_time = datetime.now()
    delete_pending_approvals(db, contract_id)
    db.commit()
    return True


def start_execute(
    db: Session,
    contract_id: str,
    *,
    tenant_no: str,
    remark: str = "",
    user_id: str = None,
    user_info=None,
) -> bool:
    entity = _get_contract_row_in_scope(db, contract_id, tenant_no=tenant_no, user_info=user_info)
    if not entity:
        raise ValueError("合同不存在")
    if entity.status != "approved":
        raise ValueError("只有已审批的合同才能开始执行")
    entity.status = "executing"
    if remark:
        entity.remark = remark
    entity.update_by = user_id
    entity.update_time = datetime.now()
    db.commit()
    return True


def finish_contract(
    db: Session,
    contract_id: str,
    *,
    tenant_no: str,
    remark: str = "",
    user_id: str = None,
    user_info=None,
) -> bool:
    entity = _get_contract_row_in_scope(db, contract_id, tenant_no=tenant_no, user_info=user_info)
    if not entity:
        raise ValueError("合同不存在")
    if entity.status != "executing":
        raise ValueError("只有执行中的合同才能完成")
    entity.status = "finished"
    if remark:
        entity.remark = remark
    entity.update_by = user_id
    entity.update_time = datetime.now()
    db.commit()
    return True


def invalid_contract(
    db: Session,
    contract_id: str,
    *,
    tenant_no: str,
    invalid_reason: str,
    remark: str = "",
    user_id: str = None,
    user_info=None,
) -> bool:
    if not (invalid_reason or "").strip():
        raise ValueError("作废原因不能为空")
    entity = _get_contract_row_in_scope(db, contract_id, tenant_no=tenant_no, user_info=user_info)
    if not entity:
        raise ValueError("合同不存在")
    if entity.status == "finished":
        raise ValueError("已完成的合同不能作废")
    entity.status = "invalid"
    entity.invalid_reason = invalid_reason
    entity.invalid_time = datetime.now()
    if remark:
        entity.remark = remark
    entity.update_by = user_id
    entity.update_time = datetime.now()
    db.commit()
    return True


def save_template(
    db: Session,
    contract_id: str,
    template_content: str,
    *,
    tenant_no: str,
    settlement_clause_drafts: str = None,
    user_info=None,
) -> bool:
    entity = _get_contract_row_in_scope(db, contract_id, tenant_no=tenant_no, user_info=user_info)
    if not entity:
        raise ValueError("合同不存在")

    drafts = settlement_clause_drafts
    if not (drafts or "").strip():
        method = (entity.settlement_method or "").strip() or "arrive_payment"
        default_clause = (
            "款到发货。需方付款后安排发货，需方收到货物后，供方开具13%增值税专用发票。"
            if method == "advance_payment"
            else "货到付款，需方收到供方货物后，供方开具13%增值税专用发票，无异议后，以现汇方式月结。"
        )
        drafts = json.dumps({method: default_clause}, ensure_ascii=False)

    entity.template_content = template_content or ""
    entity.settlement_clause_drafts = drafts
    entity.update_time = datetime.now()
    db.commit()
    return True


def get_template(db: Session, contract_id: str, *, tenant_no: str) -> str:
    entity = _get_contract_row_in_scope(db, contract_id, tenant_no=tenant_no, user_info=user_info)
    if not entity:
        raise ValueError("合同不存在")
    return entity.template_content or ""


def upload_file(
    db: Session,
    contract_id: str,
    file_url: str,
    *,
    tenant_no: str,
    user_info=None,
) -> bool:
    entity = _get_contract_row_in_scope(db, contract_id, tenant_no=tenant_no, user_info=user_info)
    if not entity:
        raise ValueError("合同不存在")
    entity.contract_file = file_url or ""
    entity.update_time = datetime.now()
    db.commit()
    return True


def upload_attachments(
    db: Session,
    contract_id: str,
    oss_ids: str,
    *,
    tenant_no: str,
    user_info=None,
) -> bool:
    if not (oss_ids or "").strip():
        raise ValueError("附件ossId不能为空")
    entity = _get_contract_row_in_scope(db, contract_id, tenant_no=tenant_no, user_info=user_info)
    if not entity:
        raise ValueError("合同不存在")

    existing = (entity.attachment_files or "").strip()
    new_parts = [x.strip() for x in oss_ids.split(",") if x.strip()]
    merged = set(existing.split(",")) if existing and not existing.startswith("[") else set()
    merged.discard("")
    merged.update(new_parts)
    entity.attachment_files = ",".join(sorted(merged))
    entity.update_time = datetime.now()
    db.commit()
    return True


def upload_attachments_with_category(
    db: Session,
    contract_id: str,
    attachments: List[dict],
    *,
    tenant_no: str,
    user_info=None,
) -> bool:
    if not attachments:
        raise ValueError("附件列表不能为空")
    entity = _get_contract_row_in_scope(db, contract_id, tenant_no=tenant_no, user_info=user_info)
    if not entity:
        raise ValueError("合同不存在")

    existing_list: List[dict] = []
    raw = (entity.attachment_files or "").strip()
    if raw:
        if raw.startswith("["):
            try:
                parsed = json.loads(raw)
                if isinstance(parsed, list):
                    existing_list = [x for x in parsed if isinstance(x, dict)]
            except json.JSONDecodeError:
                pass
        else:
            for oss_id in raw.split(","):
                oid = oss_id.strip()
                if oid:
                    existing_list.append({"ossId": oid, "category": "other"})

    oss_index = {str(item.get("ossId", "")): item for item in existing_list if item.get("ossId")}
    for att in attachments:
        oss_id = str(att.get("ossId") or att.get("oss_id") or "").strip()
        if not oss_id:
            continue
        category = str(att.get("category") or "other")
        if oss_id in oss_index:
            oss_index[oss_id]["category"] = category
        else:
            oss_index[oss_id] = {"ossId": oss_id, "category": category}

    entity.attachment_files = json.dumps(list(oss_index.values()), ensure_ascii=False)
    entity.update_time = datetime.now()
    db.commit()
    return True


def statistics_overview(
    db: Session,
    tenant_no: str,
    *,
    owner_user_id: str = None,
    begin_time: str = None,
    end_time: str = None,
    user_info=None,
) -> Dict[str, Any]:
    q = db.query(CrmContract).filter(CrmContract.tenant_no == tenant_no, CrmContract.del_flag == 0)
    if owner_user_id:
        q = q.filter(CrmContract.owner_user_id == owner_user_id)
    begin_dt = _parse_optional_datetime(begin_time)
    end_dt = _parse_optional_datetime(end_time)
    if begin_dt and end_dt:
        q = q.filter(CrmContract.create_time >= begin_dt, CrmContract.create_time <= end_dt)
    elif begin_dt:
        q = q.filter(CrmContract.create_time >= begin_dt)
    elif end_dt:
        q = q.filter(CrmContract.create_time <= end_dt)
    if user_info:
        q = apply_crm_owner_scope(q, CrmContract, user_info, db, tenant_no)

    contracts = q.all()
    total_count = len(contracts)

    def _count(status: str) -> int:
        return sum(1 for c in contracts if c.status == status)

    total_amount = sum(_decimal_value(c.amount) for c in contracts)
    received_amount = sum(_decimal_value(c.received_amount) for c in contracts)
    unreceived_amount = sum(_decimal_value(c.unreceived_amount) for c in contracts)
    invoice_amount = sum(_decimal_value(c.invoice_amount) for c in contracts)
    uninvoice_amount = sum(_decimal_value(c.uninvoice_amount) for c in contracts)

    received_rate = (
        (received_amount / total_amount * Decimal("100")).quantize(Decimal("0.01"), rounding=ROUND_HALF_UP)
        if total_amount > 0
        else Decimal("0")
    )
    invoice_rate = (
        (invoice_amount / total_amount * Decimal("100")).quantize(Decimal("0.01"), rounding=ROUND_HALF_UP)
        if total_amount > 0
        else Decimal("0")
    )

    return {
        "totalCount": total_count,
        "draftCount": _count("draft"),
        "approvingCount": _count("approving"),
        "executingCount": _count("executing"),
        "finishedCount": _count("finished"),
        "invalidCount": _count("invalid"),
        "totalAmount": float(total_amount),
        "receivedAmount": float(received_amount),
        "unreceivedAmount": float(unreceived_amount),
        "receivedRate": float(received_rate),
        "invoiceAmount": float(invoice_amount),
        "uninvoiceAmount": float(uninvoice_amount),
        "invoiceRate": float(invoice_rate),
    }


def statistics_by_status(db: Session, tenant_no: str, *, user_info=None) -> List[Dict[str, Any]]:
    q = db.query(CrmContract).filter(CrmContract.tenant_no == tenant_no, CrmContract.del_flag == 0)
    if user_info:
        q = apply_crm_owner_scope(q, CrmContract, user_info, db, tenant_no)
    contracts = q.all()
    total_count = len(contracts)
    total_amount = sum(_decimal_value(c.amount) for c in contracts)

    status_map = (
        ("draft", "草稿"),
        ("approving", "审批中"),
        ("approved", "已审批"),
        ("executing", "执行中"),
        ("finished", "已完成"),
        ("invalid", "已作废"),
    )
    result = []
    for status, status_name in status_map:
        subset = [c for c in contracts if c.status == status]
        count = len(subset)
        amount = sum(_decimal_value(c.amount) for c in subset)
        percent = (count * 100.0 / total_count) if total_count else 0.0
        result.append(
            {
                "status": status,
                "statusName": status_name,
                "count": count,
                "amount": float(amount),
                "percent": f"{percent:.2f}",
            }
        )
    return result


def statistics_by_type(db: Session, tenant_no: str, *, user_info=None) -> List[Dict[str, Any]]:
    q = db.query(CrmContract).filter(CrmContract.tenant_no == tenant_no, CrmContract.del_flag == 0)
    if user_info:
        q = apply_crm_owner_scope(q, CrmContract, user_info, db, tenant_no)
    contracts = q.all()
    total_count = len(contracts)
    type_map = (
        ("sale", "销售合同"),
        ("service", "服务合同"),
        ("purchase", "采购合同"),
        ("framework", "框架合同"),
        ("supplement", "补充协议"),
        ("lease", "租赁合同"),
        ("other", "其他"),
    )
    result = []
    for contract_type, type_name in type_map:
        subset = [c for c in contracts if c.contract_type == contract_type]
        count = len(subset)
        if count == 0:
            continue
        amount = sum(_decimal_value(c.amount) for c in subset)
        percent = (count * 100.0 / total_count) if total_count else 0.0
        result.append(
            {
                "contractType": contract_type,
                "typeName": type_name,
                "count": count,
                "amount": float(amount),
                "percent": f"{percent:.2f}",
            }
        )
    return result


def _contract_period_key(dt: datetime, period_type: str) -> str:
    if period_type == "year":
        return dt.strftime("%Y")
    if period_type == "quarter":
        quarter = (dt.month - 1) // 3 + 1
        return f"{dt.year}-Q{quarter}"
    return dt.strftime("%Y-%m")


def statistics_trend(
    db: Session,
    tenant_no: str,
    *,
    period_type: str = "month",
    begin_time: str = None,
    end_time: str = None,
    user_info=None,
) -> List[Dict[str, Any]]:
    q = db.query(CrmContract).filter(CrmContract.tenant_no == tenant_no, CrmContract.del_flag == 0)
    begin_dt = _parse_optional_datetime(begin_time)
    end_dt = _parse_optional_datetime(end_time)
    if begin_dt and end_dt:
        q = q.filter(CrmContract.create_time >= begin_dt, CrmContract.create_time <= end_dt)
    if user_info:
        q = apply_crm_owner_scope(q, CrmContract, user_info, db, tenant_no)
    contracts = q.all()
    if not contracts:
        return []

    grouped: Dict[str, List[CrmContract]] = defaultdict(list)
    for contract in contracts:
        create_time = contract.create_time or datetime.now()
        grouped[_contract_period_key(create_time, period_type or "month")].append(contract)

    result = []
    for period, subset in sorted(grouped.items()):
        total_amount = sum(_decimal_value(c.amount) for c in subset)
        received_amount = sum(_decimal_value(c.received_amount) for c in subset)
        received_rate = (
            (received_amount / total_amount * Decimal("100")).quantize(Decimal("0.01"), rounding=ROUND_HALF_UP)
            if total_amount > 0
            else Decimal("0")
        )
        result.append(
            {
                "period": period,
                "totalCount": len(subset),
                "totalAmount": float(total_amount),
                "receivedAmount": float(received_amount),
                "receivedRate": float(received_rate),
            }
        )
    return result


def query_expiring(
    db: Session,
    tenant_no: str,
    *,
    days: int = 30,
    user_info=None,
) -> List[Dict[str, Any]]:
    if not days or days <= 0:
        days = 30
    today = date.today()
    end_date = today + timedelta(days=days)
    rows = (
        db.query(CrmContract)
        .filter(
            CrmContract.tenant_no == tenant_no,
            CrmContract.del_flag == 0,
            CrmContract.status == "executing",
            CrmContract.end_date.isnot(None),
            CrmContract.end_date <= end_date,
            CrmContract.end_date >= today,
        )
        .order_by(CrmContract.end_date.asc())
        .all()
    )
    return [_row_to_dict(r) for r in rows]


def _quote_products_to_contract_products(quote_products: List[dict]) -> List[dict]:
    rows = []
    for item in quote_products:
        rows.append(
            {
                "productId": item.get("productId") or item.get("product_id"),
                "productName": item.get("productName") or item.get("product_name"),
                "productNo": item.get("productNo") or item.get("product_no"),
                "categoryId": item.get("categoryId") or item.get("category_id"),
                "categoryName": item.get("categoryName") or item.get("category_name"),
                "model": item.get("model"),
                "unit": item.get("unit"),
                "quantity": item.get("quantity"),
                "price": item.get("price"),
                "discount": item.get("discount"),
                "taxRate": item.get("taxRate") or item.get("tax_rate"),
                "taxAmount": item.get("taxAmount") or item.get("tax_amount"),
                "subtotal": item.get("subtotal"),
                "packageSpec": item.get("packageSpec") or item.get("package_spec"),
                "deliveryMethod": item.get("deliveryMethod") or item.get("delivery_method"),
                "description": item.get("description"),
                "sort": item.get("sort"),
                "remark": item.get("remark"),
            }
        )
    return rows


def create_from_quote(
    db: Session,
    quote_id: str,
    *,
    tenant_no: str,
    data: dict,
    user_id: str = None,
    dept_id: str = "",
    user_info=None,
) -> str:
    """Java: createFromQuote — 返回合同 id"""
    quote = get_quote(db, quote_id, tenant_no=tenant_no)
    if not quote:
        raise ValueError("报价单不存在")

    payload = dict(data)
    payload.setdefault("quoteId", quote_id)
    payload.setdefault("customerId", quote.customer_id)
    if quote.opportunity_id:
        payload.setdefault("opportunityId", quote.opportunity_id)
    if payload.get("amount") is None:
        payload["amount"] = float(quote.final_amount or quote.total_amount or 0)
    if not payload.get("ownerUserId"):
        payload["ownerUserId"] = quote.owner_user_id or user_id or ""
    if quote.supplier_id and not payload.get("supplierId"):
        payload["supplierId"] = quote.supplier_id

    products = _get_field(payload, "products", "productList")
    if not products:
        quote_products = list_quote_products(db, quote_id, tenant_no=tenant_no)
        payload["products"] = _quote_products_to_contract_products(quote_products)

    if not payload.get("contractType"):
        qtype = (quote.quote_type or "sales").strip()
        payload["contractType"] = "purchase" if qtype == "purchase" else "sale"

    detail = create_contract(
        db,
        tenant_no=tenant_no,
        data=payload,
        user_id=user_id,
        dept_id=dept_id,
    )
    contract_id = detail["id"]

    quote_row = (
        db.query(CrmQuote)
        .filter(CrmQuote.id == quote_id, CrmQuote.tenant_no == tenant_no, CrmQuote.del_flag == 0)
        .first()
    )
    if quote_row:
        quote_row.status = "converted"
        quote_row.contract_id = contract_id
        quote_row.update_time = datetime.now()
        db.commit()

    return contract_id


def renew_contract(
    db: Session,
    parent_contract_id: str,
    *,
    tenant_no: str,
    data: dict,
    user_id: str = None,
    dept_id: str = "",
    user_info=None,
) -> str:
    """Java: renewContract — 基础续签"""
    parent = get_contract_row(db, parent_contract_id, tenant_no=tenant_no)
    if not parent:
        raise ValueError("原合同不存在")

    renewal_count = (parent.renewal_count or 0) + 1
    payload = dict(data)
    payload.setdefault("customerId", parent.customer_id)
    payload.setdefault("contactId", parent.contact_id)
    payload.setdefault("contractType", parent.contract_type)
    payload.setdefault("ownerUserId", parent.owner_user_id)
    payload.setdefault("supplierId", payload.get("supplierId") or parent.supplier_id)
    payload["parentContractId"] = parent_contract_id
    payload["renewalCount"] = renewal_count
    payload["contractNature"] = "renewal"

    if not payload.get("contractName"):
        payload["contractName"] = f"{parent.contract_name or '合同'}-续签{renewal_count}"

    payload.setdefault("partyA", parent.party_a)
    payload.setdefault("partyAAddress", parent.party_a_address)
    payload.setdefault("partyAContact", parent.party_a_contact)
    payload.setdefault("partyAMobile", parent.party_a_mobile)
    payload.setdefault("partyB", parent.party_b)
    payload.setdefault("partyBAddress", parent.party_b_address)
    payload.setdefault("partyBContact", parent.party_b_contact)
    payload.setdefault("partyBMobile", parent.party_b_mobile)
    payload.setdefault("paymentTerms", payload.get("paymentTerms") or parent.payment_terms)
    payload.setdefault("deliveryTerms", payload.get("deliveryTerms") or parent.delivery_terms)
    payload.setdefault("contractTerms", payload.get("contractTerms") or parent.contract_terms)

    if payload.get("amount") is None:
        payload["amount"] = float(parent.amount or 0)
    if payload.get("taxRate") is None and parent.tax_rate is not None:
        payload["taxRate"] = float(parent.tax_rate)

    products = _get_field(payload, "products", "productList")
    if not products:
        payload["products"] = list_contract_products(db, parent_contract_id, tenant_no=tenant_no)

    detail = create_contract(db, tenant_no=tenant_no, data=payload, user_id=user_id, dept_id=dept_id)
    return detail["id"]


def export_contracts(
    db: Session,
    tenant_no: str,
    *,
    filters: dict = None,
    user_info=None,
) -> List[Dict[str, Any]]:
    """Java: queryList for export"""
    q = db.query(CrmContract)
    q = _build_contract_filters(db, q, filters or {}, tenant_no=tenant_no)
    rows = q.limit(10000).all()
    return [_row_to_dict(r) for r in rows]


# --- 子模块：变更 / 模板（列表与详情） ---


def _change_row_to_dict(row: CrmContractChange) -> Dict[str, Any]:
    return {
        "id": row.id,
        "contractId": row.contract_id or "",
        "contractNo": row.contract_no or "",
        "changeType": row.change_type or "",
        "changeReason": row.change_reason or "",
        "changeContent": row.change_content or "",
        "oldValue": row.old_value or "",
        "newValue": row.new_value or "",
        "changeAmount": float(row.change_amount) if row.change_amount is not None else None,
        "approvalStatus": row.approval_status or "",
        "approverId": row.approver_id or "",
        "approverName": row.approver_name or "",
        "approvalTime": row.approval_time.strftime(_FMT) if row.approval_time else "",
        "approvalOpinion": row.approval_opinion or "",
        "attachmentFiles": row.attachment_files or "",
        "remark": row.remark or "",
        "createTime": row.create_time.strftime(_FMT) if row.create_time else "",
    }


def list_contract_changes(
    db: Session,
    tenant_no: str,
    *,
    page: int = 1,
    page_size: int = 10,
    filters: dict = None,
    user_info=None,
) -> Tuple[List[Dict[str, Any]], int]:
    q = db.query(CrmContractChange).filter(
        CrmContractChange.tenant_no == tenant_no,
        CrmContractChange.del_flag == 0,
    )
    if user_info:
        q = apply_crm_create_by_scope(q, CrmContractChange, user_info, db, tenant_no)
    filters = filters or {}
    contract_id = (filters.get("contractId") or filters.get("contract_id") or "").strip()
    if contract_id:
        q = q.filter(CrmContractChange.contract_id == contract_id)
    contract_no = (filters.get("contractNo") or filters.get("contract_no") or "").strip()
    if contract_no:
        q = q.filter(CrmContractChange.contract_no.like(f"%{contract_no}%"))
    total = q.order_by(None).with_entities(func.count(CrmContractChange.id)).scalar() or 0
    page = max(1, page)
    page_size = min(max(1, page_size), 100)
    rows = q.order_by(CrmContractChange.create_time.desc()).offset((page - 1) * page_size).limit(page_size).all()
    return [_change_row_to_dict(r) for r in rows], int(total)


def get_contract_change_detail(
    db: Session,
    change_id: str,
    *,
    tenant_no: str,
    user_info=None,
) -> Dict[str, Any]:
    row = (
        db.query(CrmContractChange)
        .filter(
            CrmContractChange.id == change_id,
            CrmContractChange.tenant_no == tenant_no,
            CrmContractChange.del_flag == 0,
        )
        .first()
    )
    if not row:
        raise ValueError("合同变更记录不存在")
    ensure_crm_create_by_row_in_scope(
        db, row, user_info, tenant_no, message="无权访问该合同变更"
    )
    return _change_row_to_dict(row)


def _template_row_to_dict(row: CrmContractTemplate) -> Dict[str, Any]:
    return {
        "id": row.id,
        "templateNo": row.template_no or "",
        "templateName": row.template_name or "",
        "contractType": row.contract_type or "",
        "templateContent": row.template_content or "",
        "paymentTerms": row.payment_terms or "",
        "deliveryTerms": row.delivery_terms or "",
        "contractTerms": row.contract_terms or "",
        "partyB": row.party_b or "",
        "partyBAddress": row.party_b_address or "",
        "partyBContact": row.party_b_contact or "",
        "partyBMobile": row.party_b_mobile or "",
        "defaultCurrency": row.default_currency or "CNY",
        "defaultTaxRate": float(row.default_tax_rate) if row.default_tax_rate is not None else 6.0,
        "defaultPeriod": row.default_period,
        "isActive": row.is_active if row.is_active is not None else 1,
        "usageCount": row.usage_count if row.usage_count is not None else 0,
        "sort": row.sort if row.sort is not None else 0,
        "remark": row.remark or "",
        "createTime": row.create_time.strftime(_FMT) if row.create_time else "",
    }


def list_contract_templates(
    db: Session,
    tenant_no: str,
    *,
    page: int = 1,
    page_size: int = 10,
    filters: dict = None,
    user_info=None,
) -> Tuple[List[Dict[str, Any]], int]:
    q = db.query(CrmContractTemplate).filter(
        CrmContractTemplate.tenant_no == tenant_no,
        CrmContractTemplate.del_flag == 0,
    )
    if user_info:
        q = apply_crm_create_by_scope(q, CrmContractTemplate, user_info, db, tenant_no)
    filters = filters or {}
    template_no = (filters.get("templateNo") or filters.get("template_no") or "").strip()
    if template_no:
        q = q.filter(CrmContractTemplate.template_no.like(f"%{template_no}%"))
    template_name = (filters.get("templateName") or filters.get("template_name") or "").strip()
    if template_name:
        q = q.filter(CrmContractTemplate.template_name.like(f"%{template_name}%"))
    if filters.get("isActive") is not None:
        q = q.filter(CrmContractTemplate.is_active == int(filters["isActive"]))
    total = q.order_by(None).with_entities(func.count(CrmContractTemplate.id)).scalar() or 0
    page = max(1, page)
    page_size = min(max(1, page_size), 100)
    rows = q.order_by(CrmContractTemplate.sort.asc(), CrmContractTemplate.create_time.desc()).offset(
        (page - 1) * page_size
    ).limit(page_size).all()
    return [_template_row_to_dict(r) for r in rows], int(total)


def get_contract_template_detail(
    db: Session,
    template_id: str,
    *,
    tenant_no: str,
) -> Dict[str, Any]:
    row = (
        db.query(CrmContractTemplate)
        .filter(
            CrmContractTemplate.id == template_id,
            CrmContractTemplate.tenant_no == tenant_no,
            CrmContractTemplate.del_flag == 0,
        )
        .first()
    )
    if not row:
        raise ValueError("合同模板不存在")
    return _template_row_to_dict(row)


def _opportunity_products_to_contract_products(items: List[dict]) -> List[dict]:
    rows = []
    for item in items:
        rows.append(
            {
                "productId": item.get("productId") or item.get("product_id"),
                "productName": item.get("productName") or item.get("product_name"),
                "productNo": item.get("productNo") or item.get("product_no") or item.get("productCode"),
                "categoryId": item.get("categoryId") or item.get("category_id"),
                "categoryName": item.get("categoryName") or item.get("category_name"),
                "model": item.get("model"),
                "unit": item.get("unit"),
                "quantity": item.get("quantity"),
                "price": item.get("price"),
                "discount": item.get("discount"),
                "taxRate": item.get("taxRate") or item.get("tax_rate"),
                "subtotal": item.get("subtotal"),
                "description": item.get("description"),
                "sort": item.get("sort") or item.get("sortOrder"),
                "remark": item.get("remark"),
            }
        )
    return rows


def create_from_opportunity(
    db: Session,
    opportunity_id: str,
    *,
    tenant_no: str,
    data: dict,
    user_id: str = None,
    dept_id: str = "",
    user_info=None,
) -> str:
    """Java: createFromOpportunity — 返回合同 id"""
    opp_row = (
        db.query(CrmOpportunity)
        .filter(
            CrmOpportunity.id == opportunity_id,
            CrmOpportunity.tenant_no == tenant_no,
            CrmOpportunity.del_flag == 0,
        )
        .first()
    )
    if not opp_row:
        raise ValueError("商机不存在")

    payload = dict(data)
    payload.setdefault("opportunityId", opportunity_id)
    payload.setdefault("customerId", opp_row.customer_id)
    if payload.get("amount") is None:
        payload["amount"] = float(opp_row.amount or 0)
    if not payload.get("ownerUserId"):
        payload["ownerUserId"] = opp_row.owner_user_id or user_id or ""

    products = _get_field(payload, "products", "productList")
    if not products:
        from app.crud.crm.opportunity_product import list_products_by_opportunity

        opp_products = list_products_by_opportunity(db, opportunity_id, tenant_no=tenant_no)
        payload["products"] = _opportunity_products_to_contract_products(opp_products)

    detail = create_contract(
        db,
        tenant_no=tenant_no,
        data=payload,
        user_id=user_id,
        dept_id=dept_id,
    )
    contract_id = detail["id"]

    opp_row.stage = "won"
    opp_row.update_time = datetime.now()
    db.commit()
    return contract_id


def sign_contract(
    db: Session,
    contract_id: str,
    *,
    tenant_no: str,
    actual_sign_date: str,
    contract_file: str,
    remark: str = "",
    user_id: str = None,
    user_info=None,
) -> bool:
    """Java: signContract"""
    entity = _get_contract_row_in_scope(db, contract_id, tenant_no=tenant_no, user_info=user_info)
    if not entity:
        raise ValueError("合同不存在")
    if entity.status != "approved":
        raise ValueError("只有审批通过的合同才能签订")

    entity.actual_sign_date = _parse_optional_date(actual_sign_date)
    entity.contract_file = (contract_file or "").strip()
    entity.status = "executing"
    entity.performance_status = "normal"
    entity.performance_rate = Decimal("0")
    if remark:
        entity.remark = remark
    entity.update_by = user_id
    entity.update_time = datetime.now()
    db.commit()
    return True


def batch_assign_owner(
    db: Session,
    contract_ids: List[str],
    *,
    tenant_no: str,
    owner_user_id: str,
    remark: str = "",
    user_id: str = None,
    user_info=None,
) -> int:
    """Java: batchAssignOwner"""
    if not contract_ids:
        raise ValueError("合同ID列表不能为空")
    owner_id = (owner_user_id or "").strip()
    if not owner_id:
        raise ValueError("负责人ID不能为空")

    success = 0
    owner_name = _resolve_user_display_name(db, owner_id)
    for cid in contract_ids:
        entity = _get_contract_row_in_scope(db, cid, tenant_no=tenant_no, user_info=user_info)
        if not entity:
            continue
        entity.owner_user_id = owner_id
        entity.owner_user_name = owner_name
        if remark:
            entity.remark = remark
        entity.update_by = user_id
        entity.update_time = datetime.now()
        success += 1
    db.commit()
    return success


def download_contract_pdf(
    db: Session,
    contract_id: str,
    *,
    tenant_no: str,
    user_info=None,
) -> str:
    """Java: downloadContractPdf — 返回合同文件 URL/路径"""
    detail = get_contract_detail(db, contract_id, tenant_no=tenant_no)
    if not detail:
        raise ValueError("合同不存在")
    file_path = (detail.get("contractFile") or "").strip()
    if not file_path:
        raise ValueError("合同PDF文件不存在")
    return file_path


def generate_template_no(db: Session, tenant_no: str) -> str:
    """Java: generateTemplateNo — TMPL{yyyyMMdd}{4位序号}"""
    date_str = datetime.now().strftime("%Y%m%d")
    prefix = f"TMPL{date_str}"
    last = (
        db.query(CrmContractTemplate)
        .filter(
            CrmContractTemplate.tenant_no == tenant_no,
            CrmContractTemplate.del_flag == 0,
            CrmContractTemplate.template_no.like(f"{prefix}%"),
        )
        .order_by(CrmContractTemplate.template_no.desc())
        .first()
    )
    sequence = 1
    if last and last.template_no and len(last.template_no) >= len(prefix) + 4:
        try:
            sequence = int(last.template_no[len(prefix) :]) + 1
        except ValueError:
            sequence = 1
    for retry in range(10):
        candidate = f"{prefix}{sequence + retry:04d}"
        exists = (
            db.query(CrmContractTemplate.id)
            .filter(CrmContractTemplate.template_no == candidate, CrmContractTemplate.del_flag == 0)
            .first()
        )
        if not exists:
            return candidate
    raise ValueError("生成模板编号失败，请稍后重试")


def _get_change_row(db: Session, change_id: str, *, tenant_no: str) -> Optional[CrmContractChange]:
    return (
        db.query(CrmContractChange)
        .filter(
            CrmContractChange.id == change_id,
            CrmContractChange.tenant_no == tenant_no,
            CrmContractChange.del_flag == 0,
        )
        .first()
    )


def _enrich_change_rows(db: Session, rows: List[Dict[str, Any]]) -> List[Dict[str, Any]]:
    contract_ids = {row.get("contractId") for row in rows if row.get("contractId")}
    if not contract_ids:
        return rows
    contracts = (
        db.query(CrmContract.id, CrmContract.contract_name)
        .filter(CrmContract.id.in_(contract_ids), CrmContract.del_flag == 0)
        .all()
    )
    name_map = {item.id: item.contract_name or "" for item in contracts}
    for row in rows:
        row["contractName"] = name_map.get(row.get("contractId"), "")
    return rows


def create_contract_change(
    db: Session,
    *,
    tenant_no: str,
    data: dict,
    user_id: str = None,
    dept_id: str = "",
) -> Dict[str, Any]:
    contract_id = (_get_field(data, "contract_id", "contractId") or "").strip()
    if not contract_id:
        raise ValueError("合同ID不能为空")
    contract = get_contract_row(db, contract_id, tenant_no=tenant_no)
    if not contract:
        raise ValueError("合同不存在")

    change_type = (_get_field(data, "change_type", "changeType") or "").strip()
    change_reason = (_get_field(data, "change_reason", "changeReason") or "").strip()
    if not change_type:
        raise ValueError("变更类型不能为空")
    if not change_reason:
        raise ValueError("变更原因不能为空")

    now = datetime.now()
    entity = CrmContractChange(
        id=generate_uuid(),
        contract_id=contract_id,
        contract_no=(_get_field(data, "contract_no", "contractNo") or contract.contract_no or "").strip(),
        change_type=change_type,
        change_reason=change_reason,
        change_content=_get_field(data, "change_content", "changeContent") or "",
        old_value=_get_field(data, "old_value", "oldValue") or "",
        new_value=_get_field(data, "new_value", "newValue") or "",
        change_amount=_decimal_value(_get_field(data, "change_amount", "changeAmount"))
        if _get_field(data, "change_amount", "changeAmount") is not None
        else None,
        approval_status="pending",
        attachment_files=_get_field(data, "attachment_files", "attachmentFiles") or "",
        remark=_get_field(data, "remark") or "",
        tenant_no=tenant_no,
        create_by=user_id,
        create_dept_id=dept_id or "",
        create_time=now,
        update_by=user_id,
        update_time=now,
        del_flag=0,
    )
    db.add(entity)
    db.commit()
    return get_contract_change_detail(db, entity.id, tenant_no=tenant_no)


def update_contract_change(
    db: Session,
    change_id: str,
    *,
    tenant_no: str,
    data: dict,
    user_id: str = None,
    user_info=None,
) -> Dict[str, Any]:
    entity = _get_change_row(db, change_id, tenant_no=tenant_no)
    if not entity:
        raise ValueError("合同变更记录不存在")
    ensure_crm_create_by_row_in_scope(
        db, entity, user_info, tenant_no, message="无权访问该合同变更"
    )
    if entity.approval_status != "pending":
        raise ValueError("只能修改待审批状态的变更记录")

    for keys, attr in (
        (("change_type", "changeType"), "change_type"),
        (("change_reason", "changeReason"), "change_reason"),
        (("change_content", "changeContent"), "change_content"),
        (("old_value", "oldValue"), "old_value"),
        (("new_value", "newValue"), "new_value"),
        (("attachment_files", "attachmentFiles"), "attachment_files"),
        (("remark",), "remark"),
    ):
        val = _get_field(data, *keys)
        if val is not None:
            setattr(entity, attr, val)
    if _get_field(data, "change_amount", "changeAmount") is not None:
        entity.change_amount = _decimal_value(_get_field(data, "change_amount", "changeAmount"))
    entity.update_by = user_id
    entity.update_time = datetime.now()
    db.commit()
    return get_contract_change_detail(db, change_id, tenant_no=tenant_no)


def soft_delete_contract_changes(
    db: Session,
    change_ids: List[str],
    *,
    tenant_no: str,
    validate: bool = True,
    user_info=None,
) -> int:
    count = 0
    for cid in change_ids:
        entity = _get_change_row(db, cid, tenant_no=tenant_no)
        if not entity:
            continue
        ensure_crm_create_by_row_in_scope(
            db, entity, user_info, tenant_no, message="无权访问该合同变更"
        )
        if validate and entity.approval_status != "pending":
            raise ValueError("只能删除待审批状态的变更记录")
        entity.del_flag = 1
        entity.update_time = datetime.now()
        count += 1
    db.commit()
    return count


def submit_change_approval(
    db: Session,
    change_id: str,
    *,
    tenant_no: str,
    approver_ids: List[str] = None,
    remark: str = "",
    user_id: str = None,
) -> bool:
    """Java Controller TODO — 保持 pending，记录备注"""
    entity = _get_change_row(db, change_id, tenant_no=tenant_no)
    if not entity:
        raise ValueError("变更记录不存在")
    if entity.approval_status != "pending":
        raise ValueError("只能提交待审批状态的变更记录")
    if remark:
        entity.remark = remark
    entity.update_by = user_id
    entity.update_time = datetime.now()
    db.commit()
    return True


def withdraw_change(db: Session, change_id: str, *, tenant_no: str, user_id: str = None) -> bool:
    entity = _get_change_row(db, change_id, tenant_no=tenant_no)
    if not entity:
        raise ValueError("变更记录不存在")
    if entity.approval_status != "pending":
        raise ValueError("只能撤回待审批状态的变更记录")
    entity.del_flag = 1
    entity.update_by = user_id
    entity.update_time = datetime.now()
    db.commit()
    return True


def execute_change(db: Session, change_id: str, *, tenant_no: str, user_id: str = None) -> bool:
    entity = _get_change_row(db, change_id, tenant_no=tenant_no)
    if not entity:
        raise ValueError("变更记录不存在")
    if entity.approval_status != "approved":
        raise ValueError("只能执行已通过审批的变更")
    entity.update_by = user_id
    entity.update_time = datetime.now()
    db.commit()
    return True


def export_contract_changes(
    db: Session,
    tenant_no: str,
    *,
    filters: dict = None,
) -> List[Dict[str, Any]]:
    rows, _ = list_contract_changes(
        db,
        tenant_no,
        page=1,
        page_size=10000,
        filters=filters or {},
    )
    return _enrich_change_rows(db, rows)


def create_contract_template(
    db: Session,
    *,
    tenant_no: str,
    data: dict,
    user_id: str = None,
    dept_id: str = "",
) -> Dict[str, Any]:
    template_name = (_get_field(data, "template_name", "templateName") or "").strip()
    if not template_name:
        raise ValueError("模板名称不能为空")

    template_no = (_get_field(data, "template_no", "templateNo") or "").strip()
    if not template_no:
        template_no = generate_template_no(db, tenant_no)

    now = datetime.now()
    entity = CrmContractTemplate(
        id=generate_uuid(),
        template_no=template_no,
        template_name=template_name,
        contract_type=_get_field(data, "contract_type", "contractType") or "",
        template_content=_get_field(data, "template_content", "templateContent") or "",
        payment_terms=_get_field(data, "payment_terms", "paymentTerms") or "",
        delivery_terms=_get_field(data, "delivery_terms", "deliveryTerms") or "",
        contract_terms=_get_field(data, "contract_terms", "contractTerms") or "",
        party_b=_get_field(data, "party_b", "partyB") or "",
        party_b_address=_get_field(data, "party_b_address", "partyBAddress") or "",
        party_b_contact=_get_field(data, "party_b_contact", "partyBContact") or "",
        party_b_mobile=_get_field(data, "party_b_mobile", "partyBMobile") or "",
        default_currency=_get_field(data, "default_currency", "defaultCurrency") or "CNY",
        default_tax_rate=_decimal_value(_get_field(data, "default_tax_rate", "defaultTaxRate"), Decimal("6.00")),
        default_period=int(_get_field(data, "default_period", "defaultPeriod") or 12),
        is_active=int(_get_field(data, "is_active", "isActive") if _get_field(data, "is_active", "isActive") is not None else 1),
        usage_count=0,
        sort=int(_get_field(data, "sort") or 0),
        remark=_get_field(data, "remark") or "",
        tenant_no=tenant_no,
        create_by=user_id,
        create_dept_id=dept_id or "",
        create_time=now,
        update_by=user_id,
        update_time=now,
        del_flag=0,
    )
    db.add(entity)
    db.commit()
    return get_contract_template_detail(db, entity.id, tenant_no=tenant_no)


def update_contract_template(
    db: Session,
    template_id: str,
    *,
    tenant_no: str,
    data: dict,
    user_id: str = None,
    user_info=None,
) -> Dict[str, Any]:
    entity = (
        db.query(CrmContractTemplate)
        .filter(
            CrmContractTemplate.id == template_id,
            CrmContractTemplate.tenant_no == tenant_no,
            CrmContractTemplate.del_flag == 0,
        )
        .first()
    )
    if not entity:
        raise ValueError("合同模板不存在")
    ensure_crm_create_by_row_in_scope(
        db, entity, user_info, tenant_no, message="无权访问该合同模板"
    )

    field_map = (
        (("template_no", "templateNo"), "template_no"),
        (("template_name", "templateName"), "template_name"),
        (("contract_type", "contractType"), "contract_type"),
        (("template_content", "templateContent"), "template_content"),
        (("payment_terms", "paymentTerms"), "payment_terms"),
        (("delivery_terms", "deliveryTerms"), "delivery_terms"),
        (("contract_terms", "contractTerms"), "contract_terms"),
        (("party_b", "partyB"), "party_b"),
        (("party_b_address", "partyBAddress"), "party_b_address"),
        (("party_b_contact", "partyBContact"), "party_b_contact"),
        (("party_b_mobile", "partyBMobile"), "party_b_mobile"),
        (("default_currency", "defaultCurrency"), "default_currency"),
        (("remark",), "remark"),
    )
    for keys, attr in field_map:
        val = _get_field(data, *keys)
        if val is not None:
            setattr(entity, attr, val)
    if _get_field(data, "default_tax_rate", "defaultTaxRate") is not None:
        entity.default_tax_rate = _decimal_value(_get_field(data, "default_tax_rate", "defaultTaxRate"))
    if _get_field(data, "default_period", "defaultPeriod") is not None:
        entity.default_period = int(_get_field(data, "default_period", "defaultPeriod"))
    if _get_field(data, "is_active", "isActive") is not None:
        entity.is_active = int(_get_field(data, "is_active", "isActive"))
    if _get_field(data, "sort") is not None:
        entity.sort = int(_get_field(data, "sort"))
    entity.update_by = user_id
    entity.update_time = datetime.now()
    db.commit()
    return get_contract_template_detail(db, template_id, tenant_no=tenant_no)


def soft_delete_contract_templates(
    db: Session,
    template_ids: List[str],
    *,
    tenant_no: str,
    validate: bool = True,
    user_info=None,
) -> int:
    count = 0
    for tid in template_ids:
        entity = (
            db.query(CrmContractTemplate)
            .filter(
                CrmContractTemplate.id == tid,
                CrmContractTemplate.tenant_no == tenant_no,
                CrmContractTemplate.del_flag == 0,
            )
            .first()
        )
        if not entity:
            continue
        ensure_crm_create_by_row_in_scope(
            db, entity, user_info, tenant_no, message="无权访问该合同模板"
        )
        if validate and (entity.usage_count or 0) > 0:
            raise ValueError(f"模板【{entity.template_name}】已被使用，不能删除")
        entity.del_flag = 1
        entity.update_time = datetime.now()
        count += 1
    db.commit()
    return count


def toggle_contract_template_active(
    db: Session,
    template_id: str,
    *,
    tenant_no: str,
    is_active: int,
    user_id: str = None,
) -> bool:
    entity = (
        db.query(CrmContractTemplate)
        .filter(
            CrmContractTemplate.id == template_id,
            CrmContractTemplate.tenant_no == tenant_no,
            CrmContractTemplate.del_flag == 0,
        )
        .first()
    )
    if not entity:
        raise ValueError("合同模板不存在")
    entity.is_active = 1 if int(is_active) == 1 else 0
    entity.update_by = user_id
    entity.update_time = datetime.now()
    db.commit()
    return True


def export_contract_templates(
    db: Session,
    tenant_no: str,
    *,
    filters: dict = None,
) -> List[Dict[str, Any]]:
    rows, _ = list_contract_templates(
        db,
        tenant_no,
        page=1,
        page_size=10000,
        filters=filters or {},
    )
    return rows