import time
from contextlib import asynccontextmanager

from fastapi import FastAPI, Request, Response
from fastapi.middleware.cors import CORSMiddleware
from fastapi.middleware.gzip import GZipMiddleware
from sqlalchemy import text

from common.database.db_session_manager import DB_SESSION_MNG
from common.enums import DBType, DBWRType
from common.logger import LOG
from common.utils.gtime import GTime
from config.server_configs import web_server_config
from scheduler import shutdown_scheduler, start_scheduler
import router.v1.auth.account
import router.v1.place.place
import router.v1.fact.fact
import router.v1.faq.faq
import router.v1.media.media
import router.v1.media.relay
import router.v1.job.job
import router.v1.site.site
import router.v1.site.showcase
import router.v1.site.booking_request
import router.v1.site.post
import router.v1.site.review
import router.v1.local.local
import router.v1.ops.ops
import router.v1.social.social
import router.v1.social.oauth
import router.v1.agent.kakao
import router.v1.agent.chat
import router.v1.agent.kakao_bot

API_SERVER_START_TIME = GTime.UTCStr()


@asynccontextmanager
async def lifespan(app: FastAPI):
    # startup: 배치 스케줄러 기동(SCHEDULER_ENABLED=1 인 프로세스에서만)
    start_scheduler()
    yield
    # shutdown: 스케줄러 정지 + DB 엔진 커넥션 풀 정리
    shutdown_scheduler()
    await DB_SESSION_MNG.dispose_all()


app = FastAPI(title="Web4Ai API", lifespan=lifespan)

# CORS — 관리자 프론트(client_url) + 랜딩(landing_url, 미설정이면 제외).
def _origins(*values: str) -> list[str]:
    seen: list[str] = []
    for value in values:
        for origin in value.split(","):
            origin = origin.strip().rstrip("/")
            if origin and origin not in seen:
                seen.append(origin)
    return seen


ALLOWED_ORIGINS = _origins(web_server_config.client_url, web_server_config.landing_url)

app.add_middleware(
    CORSMiddleware,
    allow_origins=ALLOWED_ORIGINS,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Accept-Encoding: gzip 요청에 대해 1000 bytes 이상 응답을 압축.
app.add_middleware(GZipMiddleware, minimum_size=1000)


@app.middleware("http")
async def log_time(request: Request, call_next):
    start_time = time.time()
    response = await call_next(request)
    if request.url.path.startswith('/v1/social/'):
        response.headers['Cache-Control'] = 'no-store'
        response.headers['Referrer-Policy'] = 'no-referrer'
        response.headers['X-Robots-Tag'] = 'noindex, nofollow'
    elapsed = time.time() - start_time
    # status_code 를 함께 남긴다(403/4xx 등을 로그만으로 식별 가능하게).
    LOG.d(f"{response.status_code} {request.method} {request.url.path} - {elapsed:.4f}s")
    return response


@app.get(path="/healthz", responses={404: {"description": "Not found"}})
async def healthz():
    return API_SERVER_START_TIME


@app.get(path="/readyz", responses={404: {"description": "Not found"}, 503: {"description": "Not ready"}})
async def readyz(response: Response):
    """healthz 와 다른 걸 본다 — healthz 는 "프로세스가 살아 있나"(항상 200), 이건 "요청을 실제로 처리할 수 있나"(DB 에 붙는지 실제로 한 번 물어본다)."""
    try:
        async def _ping(s):
            await s.execute(text("SELECT 1"))
            return True

        await DB_SESSION_MNG.execute_lambda(DBType.MAIN.value, DBWRType.DB_READ.value, _ping)
        return {"ok": True, "db": "up"}
    except Exception as ex:  # noqa: BLE001 — 준비 안 됐다는 것 자체가 이 엔드포인트의 응답이다
        LOG.w(f"[readyz] DB 연결 확인 실패: {type(ex).__name__}: {ex}")
        response.status_code = 503
        return {"ok": False, "db": "down"}


# 각 도메인 라우터를 등록한다.
app.include_router(router.v1.auth.account.router)
app.include_router(router.v1.place.place.router)
app.include_router(router.v1.fact.fact.router)
app.include_router(router.v1.faq.faq.router)
app.include_router(router.v1.media.media.router)
# 인증 없는 공개 중계.
app.include_router(router.v1.media.relay.router)
app.include_router(router.v1.job.job.router)
app.include_router(router.v1.site.site.router)
app.include_router(router.v1.site.site.my_router)
# 인증 없는 공개 목록.
app.include_router(router.v1.site.showcase.router)
app.include_router(router.v1.site.booking_request.router)
app.include_router(router.v1.site.post.router)
app.include_router(router.v1.site.post.owner_router)
app.include_router(router.v1.site.review.router)
app.include_router(router.v1.local.local.router)
app.include_router(router.v1.local.local.weather_router)
app.include_router(router.v1.ops.ops.router)

app.include_router(router.v1.social.social.router)
app.include_router(router.v1.social.oauth.router)
app.include_router(router.v1.agent.kakao.router)
app.include_router(router.v1.agent.chat.router)
app.include_router(router.v1.agent.kakao_bot.router)