"""hyungi_Document_Server — FastAPI 엔트리포인트"""

from contextlib import asynccontextmanager

from fastapi import FastAPI, Request
from fastapi.responses import RedirectResponse
from sqlalchemy import func, select, text

from api.auth import router as auth_router
from api.dashboard import router as dashboard_router
from api.documents import router as documents_router
from api.search import router as search_router
from api.setup import router as setup_router
from core.config import settings
from core.database import async_session, engine, init_db
from models.user import User


@asynccontextmanager
async def lifespan(app: FastAPI):
    """앱 시작/종료 시 실행되는 lifespan 핸들러"""
    from apscheduler.schedulers.asyncio import AsyncIOScheduler
    from apscheduler.triggers.cron import CronTrigger
    from workers.daily_digest import run as daily_digest_run
    from workers.file_watcher import watch_inbox
    from workers.law_monitor import run as law_monitor_run
    from workers.mailplus_archive import run as mailplus_run
    from workers.queue_consumer import consume_queue

    # 시작: DB 연결 확인
    await init_db()

    # NAS 마운트 확인 (NFS 미마운트 시 로컬 빈 디렉토리에 쓰는 것 방지)
    from pathlib import Path
    nas_check = Path(settings.nas_mount_path) / "PKM"
    if not nas_check.is_dir():
        raise RuntimeError(
            f"NAS 마운트 확인 실패: {nas_check} 디렉토리 없음. "
            f"NFS 마운트 상태를 확인하세요."
        )

    # APScheduler: 백그라운드 작업
    scheduler = AsyncIOScheduler(timezone="Asia/Seoul")
    # 상시 실행
    scheduler.add_job(consume_queue, "interval", minutes=1, id="queue_consumer")
    scheduler.add_job(watch_inbox, "interval", minutes=5, id="file_watcher")
    # 일일 스케줄 (KST)
    scheduler.add_job(law_monitor_run, CronTrigger(hour=7), id="law_monitor")
    scheduler.add_job(mailplus_run, CronTrigger(hour=7), id="mailplus_morning")
    scheduler.add_job(mailplus_run, CronTrigger(hour=18), id="mailplus_evening")
    scheduler.add_job(daily_digest_run, CronTrigger(hour=20), id="daily_digest")
    scheduler.start()

    yield

    # 종료: 스케줄러 → DB 순서로 정리
    scheduler.shutdown(wait=False)
    await engine.dispose()


app = FastAPI(
    title="hyungi_Document_Server",
    description="Self-hosted PKM 웹 애플리케이션 API",
    version="2.0.0",
    lifespan=lifespan,
)

# ─── 라우터 등록 ───
app.include_router(setup_router, prefix="/api/setup", tags=["setup"])
app.include_router(auth_router, prefix="/api/auth", tags=["auth"])
app.include_router(documents_router, prefix="/api/documents", tags=["documents"])
app.include_router(search_router, prefix="/api/search", tags=["search"])

app.include_router(dashboard_router, prefix="/api/dashboard", tags=["dashboard"])

# TODO: Phase 5에서 추가
# app.include_router(tasks.router, prefix="/api/tasks", tags=["tasks"])
# app.include_router(export.router, prefix="/api/export", tags=["export"])


# ─── 셋업 미들웨어: 유저 0명이면 /setup으로 리다이렉트 ───
SETUP_BYPASS_PREFIXES = (
    "/api/setup", "/setup", "/health", "/docs", "/openapi.json", "/redoc",
)


@app.middleware("http")
async def setup_redirect_middleware(request: Request, call_next):
    path = request.url.path
    # 바이패스 경로는 항상 통과
    if any(path.startswith(p) for p in SETUP_BYPASS_PREFIXES):
        return await call_next(request)

    # 유저 존재 여부 확인
    try:
        async with async_session() as session:
            result = await session.execute(select(func.count(User.id)))
            user_count = result.scalar()
        if user_count == 0:
            return RedirectResponse(url="/setup")
    except Exception:
        pass  # DB 연결 실패 시 통과 (health에서 확인 가능)

    return await call_next(request)


# ─── 셋업 페이지 라우트 (API가 아닌 HTML 페이지) ───
@app.get("/setup")
async def setup_page_redirect(request: Request):
    """셋업 위자드 페이지로 포워딩"""
    from api.setup import setup_page
    from core.database import get_session

    async for session in get_session():
        return await setup_page(request, session)


@app.get("/health")
async def health_check():
    """헬스체크 — DB 연결 상태 포함"""
    db_ok = False
    try:
        async with engine.connect() as conn:
            await conn.execute(text("SELECT 1"))
        db_ok = True
    except Exception:
        pass

    return {
        "status": "ok" if db_ok else "degraded",
        "version": "2.0.0",
        "database": "connected" if db_ok else "disconnected",
    }