from fastapi import APIRouter, Depends, HTTPException
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.inspection import EqpChecklist, EqpChecklistItem, EqpInspectionRecord, EqpInspectionDetail
from app.schemas.inspection import (
    EqpChecklistCreate, EqpChecklistUpdate, EqpChecklistOut,
    EqpChecklistItemCreate, EqpChecklistItemOut,
    EqpInspectionRecordCreate, EqpInspectionRecordOut,
    EqpInspectionDetailOut,
)
from app.schemas.common import Response, PageResponse
from app.services.auth_service import get_current_user

router = APIRouter()


# ─── 巡检模板 ────────────────────────────────────────────────────────────────

@router.get("/checklists", response_model=Response[list[EqpChecklistOut]])
async def list_checklists(
    equipment_code: Optional[str] = None,
    db: AsyncSession = Depends(get_db),
    _=Depends(get_current_user),
):
    query = select(EqpChecklist).order_by(EqpChecklist.id)
    if equipment_code:
        query = query.where(EqpChecklist.equipment_code == equipment_code)
    r = await db.execute(query)
    return Response.ok([EqpChecklistOut.model_validate(c) for c in r.scalars()])


@router.post("/checklists", response_model=Response[EqpChecklistOut])
async def create_checklist(body: EqpChecklistCreate, db: AsyncSession = Depends(get_db), _=Depends(get_current_user)):
    items_data = body.items or []
    data = body.model_dump(exclude={"items"})
    checklist = EqpChecklist(**data)
    db.add(checklist)
    await db.flush()
    for item in items_data:
        ci = EqpChecklistItem(checklist_id=checklist.id, **item.model_dump())
        db.add(ci)
    await db.flush()
    return Response.ok(EqpChecklistOut.model_validate(checklist))


@router.put("/checklists/{checklist_id}", response_model=Response[EqpChecklistOut])
async def update_checklist(checklist_id: int, body: EqpChecklistUpdate, db: AsyncSession = Depends(get_db), _=Depends(get_current_user)):
    r = await db.execute(select(EqpChecklist).where(EqpChecklist.id == checklist_id))
    checklist = r.scalar_one_or_none()
    if not checklist:
        raise HTTPException(status_code=404, detail="模板不存在")
    for k, v in body.model_dump(exclude_none=True).items():
        setattr(checklist, k, v)
    await db.flush()
    return Response.ok(EqpChecklistOut.model_validate(checklist))


@router.get("/checklists/{checklist_id}/items", response_model=Response[list[EqpChecklistItemOut]])
async def list_checklist_items(checklist_id: int, db: AsyncSession = Depends(get_db), _=Depends(get_current_user)):
    r = await db.execute(
        select(EqpChecklistItem).where(EqpChecklistItem.checklist_id == checklist_id)
        .order_by(EqpChecklistItem.sort_order, EqpChecklistItem.id)
    )
    return Response.ok([EqpChecklistItemOut.model_validate(i) for i in r.scalars()])


@router.post("/checklist-items", response_model=Response[EqpChecklistItemOut])
async def create_checklist_item(
    body: EqpChecklistItemCreate,
    checklist_id: int,
    db: AsyncSession = Depends(get_db),
    _=Depends(get_current_user),
):
    item = EqpChecklistItem(checklist_id=checklist_id, **body.model_dump())
    db.add(item)
    await db.flush()
    return Response.ok(EqpChecklistItemOut.model_validate(item))


# ─── 巡检记录 ────────────────────────────────────────────────────────────────

@router.get("/records", response_model=Response[PageResponse[EqpInspectionRecordOut]])
async def list_records(
    page: int = 1,
    page_size: int = 20,
    checklist_id: Optional[int] = None,
    status: Optional[str] = None,
    start_date: Optional[str] = None,
    end_date: Optional[str] = None,
    db: AsyncSession = Depends(get_db),
    _=Depends(get_current_user),
):
    query = select(EqpInspectionRecord).order_by(desc(EqpInspectionRecord.created_at))
    if checklist_id:
        query = query.where(EqpInspectionRecord.checklist_id == checklist_id)
    if status:
        query = query.where(EqpInspectionRecord.status == status)
    if start_date:
        query = query.where(EqpInspectionRecord.inspect_time >= datetime.fromisoformat(start_date))
    if end_date:
        query = query.where(EqpInspectionRecord.inspect_time <= datetime.fromisoformat(end_date + "T23:59:59"))
    total = (await db.execute(select(func.count()).select_from(query.subquery()))).scalar()
    rows = await db.execute(query.offset((page - 1) * page_size).limit(page_size))
    items = [EqpInspectionRecordOut.model_validate(r) for r in rows.scalars()]
    return Response.ok(PageResponse(total=total, page=page, page_size=page_size, items=items))


@router.post("/records", response_model=Response[EqpInspectionRecordOut])
async def create_record(body: EqpInspectionRecordCreate, db: AsyncSession = Depends(get_db), _=Depends(get_current_user)):
    details_data = body.details or []
    # get checklist name
    cl_r = await db.execute(select(EqpChecklist).where(EqpChecklist.id == body.checklist_id))
    cl = cl_r.scalar_one_or_none()
    data = body.model_dump(exclude={"details"})
    record = EqpInspectionRecord(**data, checklist_name=cl.name if cl else None)
    db.add(record)
    await db.flush()
    for d in details_data:
        detail = EqpInspectionDetail(record_id=record.id, **d.model_dump())
        db.add(detail)
    await db.flush()
    return Response.ok(EqpInspectionRecordOut.model_validate(record))


@router.get("/records/{record_id}/details", response_model=Response[list[EqpInspectionDetailOut]])
async def get_record_details(record_id: int, db: AsyncSession = Depends(get_db), _=Depends(get_current_user)):
    r = await db.execute(
        select(EqpInspectionDetail).where(EqpInspectionDetail.record_id == record_id).order_by(EqpInspectionDetail.id)
    )
    return Response.ok([EqpInspectionDetailOut.model_validate(d) for d in r.scalars()])