"""地磅单联动业务逻辑 — 迁移自 simple-dibang-xiaoshou weighing._process_weighing_business_logic。"""
from __future__ import annotations

from datetime import datetime

from sqlalchemy import or_
from sqlalchemy.orm import Session

from app.models.db_models import DbInboundOutbound, DbPurchasePlan, DbWeighingSlip


def _has_weight_time(value: datetime | str | None) -> bool:
    if value is None:
        return False
    if isinstance(value, datetime):
        return True
    return bool(str(value).strip())


def process_weighing_business_logic(db: Session, weighing: DbWeighingSlip) -> None:
    """
    处理地磅单的业务逻辑：
    1. 更新计划单的已执行量（单位：kg）
    2. 更新出入库单的状态
    3. 重新计算地磅单的 executed_quantity（按创建时间顺序累计）
    """
    plan_ids_to_process: set[str] = set()
    inventory_ids_to_process: set[str] = set()

    if weighing.purchase_plan_id:
        plan_ids_to_process.add(weighing.purchase_plan_id)

    if weighing.inbound_outbound_id:
        inventory_ids_to_process.add(weighing.inbound_outbound_id)

    if weighing.plan_no:
        plans = (
            db.query(DbPurchasePlan)
            .filter(
                DbPurchasePlan.plan_no == weighing.plan_no,
                DbPurchasePlan.del_flag == 0,
                DbPurchasePlan.tenant_no == weighing.tenant_no,
            )
            .all()
        )
        for plan in plans:
            plan_ids_to_process.add(plan.id)

    for plan_id in plan_ids_to_process:
        plan = db.query(DbPurchasePlan).filter(DbPurchasePlan.id == plan_id).one_or_none()
        if not plan:
            continue

        plan_weighings = (
            db.query(DbWeighingSlip)
            .filter(
                DbWeighingSlip.is_voided == 0,
                DbWeighingSlip.del_flag == 0,
                DbWeighingSlip.tenant_no == plan.tenant_no,
                or_(
                    DbWeighingSlip.plan_no == plan.plan_no,
                    DbWeighingSlip.purchase_plan_id == plan.id,
                ),
            )
            .order_by(DbWeighingSlip.create_time.asc())
            .all()
        )

        total_executed = sum(w.net_weight for w in plan_weighings if w.net_weight)
        plan.executed_quantity = total_executed

        planned_quantity_kg = plan.planned_quantity * 1000
        if total_executed >= planned_quantity_kg:
            plan.execution_status = "已入库" if plan.business_type == "入库" else "已出库"
        elif total_executed > 0:
            plan.execution_status = "入库中" if plan.business_type == "入库" else "出库中"
        else:
            plan.execution_status = "待入库" if plan.business_type == "入库" else "待出库"

        db.commit()
        db.refresh(plan)

        cumulative_executed = 0.0
        for slip in plan_weighings:
            cumulative_executed += slip.net_weight if slip.net_weight else 0.0
            slip.executed_quantity = cumulative_executed
        db.commit()

    for inventory_id in inventory_ids_to_process:
        inventory = (
            db.query(DbInboundOutbound)
            .filter(DbInboundOutbound.id == inventory_id)
            .one_or_none()
        )
        if not inventory:
            continue

        related_weighings = (
            db.query(DbWeighingSlip)
            .filter(
                DbWeighingSlip.inbound_outbound_id == inventory_id,
                DbWeighingSlip.is_voided == 0,
                DbWeighingSlip.del_flag == 0,
            )
            .all()
        )

        all_complete = (
            len(related_weighings) > 0
            and all(
                _has_weight_time(w.gross_weight_time) and _has_weight_time(w.tare_weight_time)
                for w in related_weighings
            )
        )

        if all_complete:
            inventory.status = "已完成"
        else:
            inventory.status = (
                "待入库" if inventory.business_type == "入库" else "待出库"
            )

        db.commit()
        db.refresh(inventory)