"""租户 CRUD（sys_tenant）"""
from __future__ import annotations

import math
from datetime import datetime
from typing import Any, Dict, List, Optional, Tuple

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

from app.core.config import settings
from app.core.utils import generate_uuid
from app.models.models import SysTenant


def _row_to_dict(t: SysTenant) -> Dict[str, Any]:
    return {
        "id": t.id,
        "tenantNo": t.tenant_no,
        "tenantName": t.tenant_name,
        "contactName": t.contact_name or "",
        "contactPhone": t.contact_phone or "",
        "orderNum": t.order_num if t.order_num is not None else 0,
        "remark": t.remark or "",
        "createTime": t.create_time.strftime("%Y-%m-%d %H:%M:%S") if t.create_time else "",
        "updateTime": t.update_time.strftime("%Y-%m-%d %H:%M:%S") if t.update_time else "",
    }


def list_tenants(
    db: Session,
    *,
    page: int = 1,
    page_size: int = 10,
    keyword: Optional[str] = None,
    user_info=None,
) -> Tuple[List[Dict[str, Any]], int]:
    def _filtered():
        q0 = db.query(SysTenant).filter(SysTenant.del_flag == 0)
        kw = (keyword or "").strip()
        if kw:
            like = f"%{kw}%"
            q0 = q0.filter(or_(SysTenant.tenant_no.like(like), SysTenant.tenant_name.like(like)))
        if user_info:
            from app.core.data_scope import apply_data_scope
            q0 = apply_data_scope(q0, SysTenant, user_info, db)
        return q0

    total = _filtered().order_by(None).with_entities(func.count(SysTenant.id)).scalar() or 0
    page = max(1, page)
    page_size = min(max(1, page_size), 100)
    rows = (
        _filtered()
        .order_by(SysTenant.create_time.desc())
        .offset((page - 1) * page_size)
        .limit(page_size)
        .all()
    )
    return [_row_to_dict(x) for x in rows], int(total)


def get_tenant(db: Session, tenant_id: str) -> Optional[SysTenant]:
    return (
        db.query(SysTenant)
        .filter(and_(SysTenant.id == tenant_id, SysTenant.del_flag == 0))
        .first()
    )


def tenant_no_exists(db: Session, tenant_no: str, exclude_id: Optional[str] = None) -> bool:
    q = db.query(SysTenant).filter(and_(SysTenant.tenant_no == tenant_no.strip(), SysTenant.del_flag == 0))
    if exclude_id:
        q = q.filter(SysTenant.id != exclude_id)
    return q.first() is not None


def create_tenant(
    db: Session,
    *,
    tenant_no: str,
    tenant_name: str,
    contact_name: Optional[str] = None,
    contact_phone: Optional[str] = None,
    order_num: Optional[int] = None,
    remark: Optional[str] = None,
    user_id: Optional[str] = None,
) -> SysTenant:
    tn = (tenant_no or "").strip()
    if not tn:
        raise ValueError("租户编号不能为空")
    if tenant_no_exists(db, tn):
        raise ValueError("租户编号已存在")
    obj = SysTenant(
        id=generate_uuid(),
        tenant_no=tn,
        tenant_name=(tenant_name or "").strip() or tn,
        contact_name=(contact_name or "").strip() or None,
        contact_phone=(contact_phone or "").strip() or None,
        order_num=order_num if order_num is not None else 0,
        remark=(remark or "").strip() or None,
        create_by=user_id,
        create_dept_id="",
        create_time=datetime.now(),
        update_by=user_id,
        update_time=datetime.now(),
        del_flag=0,
    )
    db.add(obj)
    db.commit()
    db.refresh(obj)
    return obj


def update_tenant(
    db: Session,
    tenant_id: str,
    *,
    tenant_no: Optional[str] = None,
    tenant_name: Optional[str] = None,
    contact_name: Optional[str] = None,
    contact_phone: Optional[str] = None,
    order_num: Optional[int] = None,
    remark: Optional[str] = None,
    user_id: Optional[str] = None,
) -> SysTenant:
    obj = get_tenant(db, tenant_id)
    if not obj:
        raise ValueError("租户不存在")
    if tenant_no is not None:
        new_no = tenant_no.strip()
        if not new_no:
            raise ValueError("租户编号不能为空")
        if obj.tenant_no == settings.DEFAULT_TENANT_NO and new_no != settings.DEFAULT_TENANT_NO:
            raise ValueError("默认租户编号不可修改")
        if new_no != obj.tenant_no and tenant_no_exists(db, new_no, exclude_id=tenant_id):
            raise ValueError("租户编号已存在")
        obj.tenant_no = new_no
    if tenant_name is not None:
        obj.tenant_name = (tenant_name or "").strip() or obj.tenant_name
    if contact_name is not None:
        obj.contact_name = (contact_name or "").strip() or None
    if contact_phone is not None:
        obj.contact_phone = (contact_phone or "").strip() or None
    if order_num is not None:
        obj.order_num = order_num
    if remark is not None:
        obj.remark = (remark or "").strip() or None
    obj.update_by = user_id
    obj.update_time = datetime.now()
    db.add(obj)
    db.commit()
    db.refresh(obj)
    return obj


def soft_delete_tenant(db: Session, tenant_id: str) -> None:
    obj = get_tenant(db, tenant_id)
    if not obj:
        raise ValueError("租户不存在")
    if obj.tenant_no == settings.DEFAULT_TENANT_NO:
        raise ValueError("默认租户不可删除")
    obj.del_flag = 1
    obj.update_time = datetime.now()
    db.add(obj)
    db.commit()


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