"""运输计划管理 - 运费结算 API"""
from datetime import date
from typing import Optional

from fastapi import APIRouter, Depends, HTTPException, Query, status
from sqlalchemy.orm import Session

from app.core.database import get_db
from app.core.db_auth import DbUserContext, get_db_current_user
from app.core.tenant_context import get_tenant_no
from app.models.pl_models import PlFreightSettlement
from app.schemas.pl.freight import (
    FreightSettlementApprovalActionBody,
    FreightSettlementByTransportRead,
    FreightSettlementCreate,
    FreightSettlementDisburseBody,
    FreightSettlementListResponse,
    FreightSettlementRead,
    FreightSettlementSubmitApprovalBody,
    FreightSettlementUpdate,
    FreightSettlementWithTransports,
    RemittanceVoucherRead,
    UnsettledPlanListResponse,
)
from app.services import pl_freight_settlement_service as freight_svc

router = APIRouter(prefix="/freight", tags=["运输计划-运费结算"])


def _generate_settlement_no(db: Session) -> str:
    today = date.today()
    prefix = f"YF{today.strftime('%Y%m%d')}"

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

    seq = int(last.settlement_no[-2:]) + 1 if last else 1
    return f"{prefix}{seq:02d}"


@router.get("/unsettled-plans", response_model=UnsettledPlanListResponse)
def list_unsettled_plans(
    q: Optional[str] = Query(default=None),
    carrier_id: Optional[str] = Query(default=None, alias="carrierId"),
    plan_type: Optional[str] = Query(default=None, alias="planType"),
    license_plate: Optional[str] = Query(default=None, alias="licensePlate"),
    page: int = Query(default=1, ge=1),
    page_size: int = Query(default=20, ge=1, le=100, alias="pageSize"),
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> UnsettledPlanListResponse:
    tenant_no = get_tenant_no(db, user.to_tenant_user_dict())
    total, items = freight_svc.list_unsettled_plans(
        db,
        tenant_no=tenant_no,
        user=user,
        q=q,
        carrier_id=carrier_id,
        plan_type=plan_type,
        license_plate=license_plate,
        page=page,
        page_size=page_size,
    )
    return UnsettledPlanListResponse(total=total, list=items)


@router.get("/", response_model=FreightSettlementListResponse)
def list_settlements(
    q: Optional[str] = Query(default=None),
    carrier_id: Optional[str] = Query(default=None, alias="carrierId"),
    settlement_status: Optional[str] = Query(default=None, alias="settlementStatus"),
    tab: Optional[str] = Query(
        default=None,
        description="bills|approval_pending|approval_done|disburse|settled",
    ),
    page: int = Query(default=1, ge=1),
    page_size: int = Query(default=20, ge=1, le=100, alias="pageSize"),
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> FreightSettlementListResponse:
    tenant_no = get_tenant_no(db, user.to_tenant_user_dict())
    total, items = freight_svc.list_settlements_enriched(
        db,
        tenant_no=tenant_no,
        user_id=user.id,
        user=user,
        q=q,
        carrier_id=carrier_id,
        settlement_status=settlement_status,
        tab=tab,
        page=page,
        page_size=page_size,
    )
    return FreightSettlementListResponse(total=total, list=items)


@router.get("/by-transport/{transport_id}", response_model=Optional[FreightSettlementByTransportRead])
def get_settlement_by_transport(
    transport_id: str,
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> Optional[FreightSettlementByTransportRead]:
    tenant_no = get_tenant_no(db, user.to_tenant_user_dict())
    detail = freight_svc.get_settlement_by_transport_id(
        db, tenant_no=tenant_no, transport_id=transport_id, user=user
    )
    if not detail:
        return None
    return FreightSettlementByTransportRead.model_validate(detail)


@router.post("/", response_model=FreightSettlementRead, status_code=status.HTTP_201_CREATED)
def create_settlement(
    payload: FreightSettlementCreate,
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> FreightSettlementRead:
    tenant_no = get_tenant_no(db, user.to_tenant_user_dict())
    settlement = freight_svc.create_settlement(
        db,
        tenant_no=tenant_no,
        plan_ids=payload.plan_ids,
        transport_ids=payload.transport_ids,
        user_id=user.id,
        dept_id=user.dept_id,
        settlement_no=_generate_settlement_no(db),
    )
    return settlement


@router.get("/{id}", response_model=FreightSettlementWithTransports)
def get_settlement(
    id: str,
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> FreightSettlementWithTransports:
    tenant_no = get_tenant_no(db, user.to_tenant_user_dict())
    detail = freight_svc.get_settlement_detail(
        db, tenant_no=tenant_no, settlement_id=id, user_id=user.id, user=user
    )
    return FreightSettlementWithTransports.model_validate(detail)


@router.put("/{id}", response_model=FreightSettlementRead)
def update_settlement(
    id: str,
    payload: FreightSettlementUpdate,
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> FreightSettlementRead:
    tenant_no = get_tenant_no(db, user.to_tenant_user_dict())
    return freight_svc.update_settlement_draft(
        db,
        tenant_no=tenant_no,
        settlement_id=id,
        payload=payload,
        user_id=user.id,
        user=user,
    )


@router.post("/{id}/cancel", response_model=FreightSettlementRead)
def cancel_settlement(
    id: str,
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> FreightSettlementRead:
    tenant_no = get_tenant_no(db, user.to_tenant_user_dict())
    return freight_svc.cancel_draft_settlement(
        db, tenant_no=tenant_no, settlement_id=id, user_id=user.id, user=user
    )


@router.delete("/{id}", status_code=status.HTTP_204_NO_CONTENT)
def delete_settlement(
    id: str,
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> None:
    tenant_no = get_tenant_no(db, user.to_tenant_user_dict())
    freight_svc.delete_draft_settlement(
        db, tenant_no=tenant_no, settlement_id=id, user_id=user.id, user=user
    )


@router.post("/{id}/submit-approval", response_model=FreightSettlementRead)
def submit_settlement_approval(
    id: str,
    payload: FreightSettlementSubmitApprovalBody,
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> FreightSettlementRead:
    tenant_no = get_tenant_no(db, user.to_tenant_user_dict())
    return freight_svc.submit_settlement_approval(
        db,
        tenant_no=tenant_no,
        settlement_id=id,
        body=payload,
        user_id=user.id,
        dept_id=user.dept_id,
        user=user,
    )


@router.post("/approval/{approval_id}", response_model=FreightSettlementRead)
def process_settlement_approval(
    approval_id: str,
    payload: FreightSettlementApprovalActionBody,
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> FreightSettlementRead:
    tenant_no = get_tenant_no(db, user.to_tenant_user_dict())
    if payload.action not in ("approve", "reject"):
        raise HTTPException(status_code=400, detail="action 必须为 approve 或 reject")
    return freight_svc.process_settlement_approval(
        db,
        tenant_no=tenant_no,
        approval_id=approval_id,
        action=payload.action,
        comment=payload.comment,
        user_id=user.id,
    )


@router.post("/{id}/withdraw-approval", response_model=FreightSettlementRead)
def withdraw_settlement_approval(
    id: str,
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> FreightSettlementRead:
    tenant_no = get_tenant_no(db, user.to_tenant_user_dict())
    return freight_svc.withdraw_settlement_approval(
        db, tenant_no=tenant_no, settlement_id=id, user_id=user.id, user=user
    )


@router.get("/{id}/approval-flow")
def get_settlement_approval_flow(
    id: str,
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
):
    tenant_no = get_tenant_no(db, user.to_tenant_user_dict())
    freight_svc.get_settlement_row(db, tenant_no, id, user=user)
    return freight_svc.get_approval_flow(db, id)


@router.post("/{id}/disburse", response_model=FreightSettlementRead)
def disburse_settlement(
    id: str,
    payload: FreightSettlementDisburseBody,
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> FreightSettlementRead:
    tenant_no = get_tenant_no(db, user.to_tenant_user_dict())
    return freight_svc.disburse_settlement(
        db,
        tenant_no=tenant_no,
        settlement_id=id,
        body=payload,
        user_id=user.id,
        dept_id=user.dept_id,
        user=user,
    )


# 向后兼容旧接口
@router.post("/{id}/submit", response_model=FreightSettlementRead, deprecated=True)
def submit_settlement_legacy(
    id: str,
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> FreightSettlementRead:
    raise HTTPException(status_code=400, detail="请使用 submit-approval 接口并选择审批人")


@router.post("/{id}/approve", response_model=FreightSettlementRead, deprecated=True)
def approve_settlement_legacy(
    id: str,
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> FreightSettlementRead:
    raise HTTPException(status_code=400, detail="请使用 approval/{approvalId} 接口审批")


@router.get("/voucher/{settlement_id}", response_model=list[RemittanceVoucherRead])
def list_vouchers(
    settlement_id: str,
    db: Session = Depends(get_db),
    user: DbUserContext = Depends(get_db_current_user),
) -> list[RemittanceVoucherRead]:
    tenant_no = get_tenant_no(db, user.to_tenant_user_dict())
    freight_svc.get_settlement_row(db, tenant_no, settlement_id, user=user)
    detail = freight_svc.get_settlement_detail(
        db, tenant_no=tenant_no, settlement_id=settlement_id, user_id=user.id, user=user
    )
    return detail.get("vouchers") or []