"""物品单位 CRUD（biz_item_unit）"""
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.utils import generate_uuid
from app.models.models import BizItemUnit


def _row_to_dict(u: BizItemUnit) -> Dict[str, Any]:
    return {
        "id": u.id,
        "unitCode": u.unit_code,
        "unitName": u.unit_name,
        "tenantNo": u.tenant_no,
        "orderNum": u.order_num if u.order_num is not None else 0,
        "remark": u.remark or "",
        "createTime": u.create_time.strftime("%Y-%m-%d %H:%M:%S") if u.create_time else "",
        "updateTime": u.update_time.strftime("%Y-%m-%d %H:%M:%S") if u.update_time else "",
    }


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

    total = _filtered().order_by(None).with_entities(func.count(BizItemUnit.id)).scalar() or 0
    page = max(1, page)
    page_size = min(max(1, page_size), 100)
    rows = (
        _filtered()
        .order_by(BizItemUnit.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_item_unit(db: Session, unit_id: str) -> Optional[BizItemUnit]:
    return (
        db.query(BizItemUnit)
        .filter(and_(BizItemUnit.id == unit_id, BizItemUnit.del_flag == 0))
        .first()
    )


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


def create_item_unit(
    db: Session,
    *,
    unit_code: str,
    unit_name: str,
    tenant_no: str = "zkxw",
    order_num: Optional[int] = None,
    remark: Optional[str] = None,
    user_id: Optional[str] = None,
) -> BizItemUnit:
    uc = (unit_code or "").strip()
    if not uc:
        raise ValueError("单位编码不能为空")
    if unit_code_exists(db, uc, tenant_no):
        raise ValueError("单位编码已存在")
    obj = BizItemUnit(
        id=generate_uuid(),
        unit_code=uc,
        unit_name=(unit_name or "").strip() or uc,
        tenant_no=tenant_no,
        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_item_unit(
    db: Session,
    unit_id: str,
    *,
    unit_code: Optional[str] = None,
    unit_name: Optional[str] = None,
    order_num: Optional[int] = None,
    remark: Optional[str] = None,
    user_id: Optional[str] = None,
) -> BizItemUnit:
    obj = get_item_unit(db, unit_id)
    if not obj:
        raise ValueError("物品单位不存在")
    if unit_code is not None:
        new_code = unit_code.strip()
        if not new_code:
            raise ValueError("单位编码不能为空")
        if new_code != obj.unit_code and unit_code_exists(db, new_code, obj.tenant_no, exclude_id=unit_id):
            raise ValueError("单位编码已存在")
        obj.unit_code = new_code
    if unit_name is not None:
        obj.unit_name = (unit_name or "").strip() or obj.unit_name
    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_item_unit(db: Session, unit_id: str) -> None:
    obj = get_item_unit(db, unit_id)
    if not obj:
        raise ValueError("物品单位不存在")
    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)))