from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select, func, desc
from typing import Optional
from datetime import datetime

from app.database import get_db
from app.models.production import ProductionRecord
from app.models.plan import ProductionPlan
from app.schemas.production import ProductionRecordCreate, ProductionRecordUpdate, ProductionRecordOut
from app.schemas.common import Response, PageResponse
from app.services.auth_service import get_current_user


async def _mark_plan_produced(db: AsyncSession, record: ProductionRecord):
    """根据实绩记录的卷号自动把对应计划标记为 produced。"""
    candidates = []
    for v in (getattr(record, "hot_coil_no", None), record.coil_no, getattr(record, "sub_coil_no", None)):
        if v and v not in candidates:
            candidates.append(v)
    if not candidates:
        return
    q = select(ProductionPlan).where(
        (ProductionPlan.cold_coil_no.in_(candidates)) | (ProductionPlan.hot_coil_no.in_(candidates))
    )
    res = await db.execute(q)
    for plan in res.scalars():
        if plan.status != "produced":
            plan.status = "produced"

router = APIRouter()


def _parse_dt(s):
    if not s:
        return None
    try:
        return datetime.fromisoformat(s.replace('Z', ''))
    except Exception:
        return None


@router.get("/", response_model=Response[PageResponse[ProductionRecordOut]])
async def list_records(
    page: int = 1,
    page_size: int = 20,
    coil_no: Optional[str] = None,
    shift: Optional[str] = None,
    start_date: Optional[str] = Query(None),
    end_date: Optional[str] = Query(None),
    db: AsyncSession = Depends(get_db),
    _ = Depends(get_current_user),
):
    query = select(ProductionRecord).order_by(desc(ProductionRecord.start_time))
    if coil_no:
        query = query.where(ProductionRecord.coil_no.ilike(f"%{coil_no}%"))
    if shift:
        query = query.where(ProductionRecord.shift == shift)
    _sd = _parse_dt(start_date)
    if _sd:
        query = query.where(ProductionRecord.start_time >= _sd)
    _ed = _parse_dt(end_date)
    if _ed:
        query = query.where(ProductionRecord.start_time <= _ed)

    total = (await db.execute(select(func.count()).select_from(query.subquery()))).scalar()
    result = await db.execute(query.offset((page - 1) * page_size).limit(page_size))
    items = [ProductionRecordOut.model_validate(r) for r in result.scalars()]
    return Response.ok(PageResponse(total=total, page=page, page_size=page_size, items=items))


@router.post("/", response_model=Response[ProductionRecordOut])
async def create_record(
    body: ProductionRecordCreate,
    db: AsyncSession = Depends(get_db),
    _ = Depends(get_current_user),
):
    record = ProductionRecord(**body.model_dump())
    db.add(record)
    await db.flush()
    await _mark_plan_produced(db, record)
    await db.flush()
    return Response.ok(ProductionRecordOut.model_validate(record))


@router.get("/{record_id}", response_model=Response[ProductionRecordOut])
async def get_record(record_id: int, db: AsyncSession = Depends(get_db), _ = Depends(get_current_user)):
    result = await db.execute(select(ProductionRecord).where(ProductionRecord.id == record_id))
    record = result.scalar_one_or_none()
    if not record:
        raise HTTPException(status_code=404, detail="实绩记录不存在")
    return Response.ok(ProductionRecordOut.model_validate(record))


@router.put("/{record_id}", response_model=Response[ProductionRecordOut])
async def update_record(
    record_id: int,
    body: ProductionRecordUpdate,
    db: AsyncSession = Depends(get_db),
    _ = Depends(get_current_user),
):
    result = await db.execute(select(ProductionRecord).where(ProductionRecord.id == record_id))
    record = result.scalar_one_or_none()
    if not record:
        raise HTTPException(status_code=404, detail="实绩记录不存在")
    for k, v in body.model_dump(exclude_none=True).items():
        setattr(record, k, v)
    await db.flush()
    await _mark_plan_produced(db, record)
    await db.flush()
    return Response.ok(ProductionRecordOut.model_validate(record))