from typing import List
from datetime import datetime
from app.core.utils import now_tw
from fastapi import APIRouter, Depends, HTTPException, BackgroundTasks
from sqlalchemy.orm import Session
from croniter import croniter

from app.core.database import get_db
from app.models.schedule import Schedule
from app.schemas.schedule import (
    ScheduleResponse, ScheduleUpdate, ScheduleLogResponse,
    LogResultsResponse, TenantResultItem, AccountResultItem,
)

router = APIRouter(prefix="/schedules", tags=["schedules"])


@router.get("", response_model=List[ScheduleResponse])
def list_schedules(db: Session = Depends(get_db)):
    return db.query(Schedule).order_by(Schedule.id).all()


@router.get("/{schedule_id}", response_model=ScheduleResponse)
def get_schedule(schedule_id: int, db: Session = Depends(get_db)):
    s = db.get(Schedule, schedule_id)
    if not s:
        raise HTTPException(status_code=404, detail="Schedule not found")
    return s


@router.put("/{schedule_id}", response_model=ScheduleResponse)
def update_schedule_cron(schedule_id: int, payload: ScheduleUpdate, db: Session = Depends(get_db)):
    s = db.get(Schedule, schedule_id)
    if not s:
        raise HTTPException(status_code=404, detail="Schedule not found")
    # Validate cron expression (5-field: 分 時 日 月 週)
    try:
        cron = croniter(payload.cron_timer, now_tw())
        next_run = cron.get_next(datetime)
    except Exception:
        raise HTTPException(status_code=422, detail="Invalid cron expression")
    s.cron_timer = payload.cron_timer
    s.next_run_at = next_run
    db.commit()
    db.refresh(s)
    return s


@router.post("/{schedule_id}/run", status_code=202)
def manual_run(schedule_id: int, background_tasks: BackgroundTasks, db: Session = Depends(get_db)):
    """手動觸發排程（非同步執行）"""
    s = db.get(Schedule, schedule_id)
    if not s:
        raise HTTPException(status_code=404, detail="Schedule not found")
    if s.status == "Going":
        raise HTTPException(status_code=409, detail="Schedule is already running")

    from app.services.scheduler.runner import dispatch_schedule
    background_tasks.add_task(dispatch_schedule, schedule_id)
    return {"message": f"Schedule '{s.name}' triggered", "schedule_id": schedule_id}


@router.get("/{schedule_id}/logs", response_model=List[ScheduleLogResponse])
def get_schedule_logs(schedule_id: int, limit: int = 20, db: Session = Depends(get_db)):
    from app.models.schedule import ScheduleLog
    logs = (
        db.query(ScheduleLog)
        .filter(ScheduleLog.schedule_id == schedule_id)
        .order_by(ScheduleLog.started_at.desc())
        .limit(limit)
        .all()
    )
    return logs


@router.get("/{schedule_id}/logs/{log_id}/results", response_model=LogResultsResponse)
def get_log_results(schedule_id: int, log_id: int, db: Session = Depends(get_db)):
    """取得某次排程執行的詳細逐項結果"""
    from app.models.result import TenantScheduleResult, AccountScheduleResult
    from app.models.tenant import Tenant
    from app.models.account import Account

    tenant_results = []
    account_results = []

    if schedule_id == 1:
        rows = (
            db.query(TenantScheduleResult)
            .filter(TenantScheduleResult.schedule_log_id == log_id)
            .all()
        )
        for r in rows:
            tenant = db.get(Tenant, r.tenant_id)
            tenant_results.append(TenantResultItem(
                tenant_id=r.tenant_id,
                tenant_name=tenant.name if tenant else None,
                traefik_status=r.traefik_status,
                sso_result=r.sso_result,
                mailbox_result=r.mailbox_result,
                nc_result=r.nc_result,
                office_result=r.office_result,
                quota_usage=r.quota_usage,
                fail_reason=r.fail_reason,
            ))

    elif schedule_id == 2:
        rows = (
            db.query(AccountScheduleResult)
            .filter(AccountScheduleResult.schedule_log_id == log_id)
            .all()
        )
        for r in rows:
            account_results.append(AccountResultItem(
                account_id=r.account_id,
                sso_account=r.sso_account,
                sso_result=r.sso_result,
                mailbox_result=r.mailbox_result,
                nc_result=r.nc_result,
                nc_mail_result=r.nc_mail_result,
                quota_usage=r.quota_usage,
                fail_reason=r.fail_reason,
            ))

    return LogResultsResponse(
        log_id=log_id,
        schedule_id=schedule_id,
        tenant_results=tenant_results,
        account_results=account_results,
    )