"""
main.py
FastAPI 애플리케이션 진입점

- 공통 설정 로드 (config_system, config_db)
- 프론트엔드 자동 빌드 및 서빙 (npm run build)
- 정적 파일 서빙 (프론트엔드 빌드 결과)
- DB 풀 초기화/종료
- 라우터 등록 (페이지별 API)
"""

import asyncio
import logging
import os
import subprocess
from contextlib import asynccontextmanager
from pathlib import Path

from fastapi import Depends, FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles

from A06_Login.A06_Login_Router import router as a06_login_router
from A07_Register.A07_Register_Router import router as a07_register_router
from A08_Support.A08_Support_Router import router as a08_support_router
from A09_Security.A09_Security_Router import router as a09_security_router
from B01_Dashboard.B01_Dashboard_Router import router as b01_dashboard_router
from B03_FileInput.B03_FileInput_Router import router as b03_file_input_router
from B04_wf1_Surface.B04_wf1_Surface_Router import router as b04_surface_router
from B05_wf2_Route.B05_wf2_Route_Router import router as b05_route_router
from B06_wf3_ProfileCross.B06_wf3_ProfileCross_Router import router as b06_section_router
from common_util.common_util_auth import require_company, verify_session
from common_util.common_util_resource_monitor import sample_resources_loop
from config.config_db import close_db_pool, get_db_pool, init_db_pool

# 설정 import
from config.config_system import (
    ADMIN_EMAIL,
    CORS_ORIGINS,
    DEBUG,
    ENVIRONMENT,
    LOG_LEVEL,
    SERVER_HOST,
    SERVER_PORT,
    STATIC_DIR,
    STATIC_URL,
)

# 로깅 설정
logging.basicConfig(level=getattr(logging, LOG_LEVEL))
logger = logging.getLogger(__name__)

# ─────────────────────────────────────────────────────────────────────────
# 프론트엔드 빌드 및 서빙 함수
# ─────────────────────────────────────────────────────────────────────────


def build_frontend() -> bool:
    """프론트엔드 빌드 (npm run build from project root)"""
    root_dir = Path(__file__).resolve().parent

    logger.info("[Frontend] npm run build 시작...")
    try:
        result = subprocess.run(
            "npm run build",
            shell=True,
            cwd=str(root_dir),
            capture_output=True,
            text=True,
            encoding="utf-8",
            errors="replace",
            timeout=300,
        )
        if result.returncode == 0:
            logger.info("✓ 프론트엔드 빌드 완료")
            return True
        else:
            logger.error(f"✗ 프론트엔드 빌드 실패:\n{result.stderr}")
            return False
    except subprocess.TimeoutExpired:
        logger.error("✗ 프론트엔드 빌드 타임아웃 (300초)")
        return False
    except Exception as e:
        logger.error(f"✗ 프론트엔드 빌드 중 예외: {e}")
        return False


def serve_frontend_dev() -> None:
    """프론트엔드 개발 서버 실행 (npm run dev from project root) — 선택 사항"""
    root_dir = Path(__file__).resolve().parent

    if ENVIRONMENT == "production":
        logger.info("[Frontend] 프로덕션 환경: 개발 서버 실행 스킵")
        return

    logger.info("[Frontend] npm run dev 시작 (백그라운드)...")
    try:
        subprocess.Popen(
            "npm run dev",
            shell=True,
            cwd=str(root_dir),
            stdout=subprocess.DEVNULL,
            stderr=subprocess.DEVNULL,
        )
        logger.info("✓ 프론트엔드 개발 서버 백그라운드 실행")
    except Exception as e:
        logger.warning(f"⚠ 프론트엔드 개발 서버 실행 실패: {e}")


async def cleanup_expired_sessions() -> None:
    """매시간 만료된 세션과 사용 완료 OTP를 정리한다."""
    while True:
        await asyncio.sleep(3600)
        pool = get_db_pool()
        async with pool.acquire() as connection, connection.cursor() as cursor:
            await cursor.execute("DELETE FROM sessions WHERE expires_at < CURRENT_TIMESTAMP")
            await cursor.execute(
                """DELETE FROM email_otps
                   WHERE expires_at < CURRENT_TIMESTAMP
                      OR consumed_at < DATE_SUB(CURRENT_TIMESTAMP, INTERVAL 1 DAY)"""
            )
            await cursor.execute(
                """DELETE FROM login_logs WHERE
                   (status = 'SUCCESS'
                     AND login_at < DATE_SUB(CURRENT_TIMESTAMP, INTERVAL 1 YEAR))
                   OR (status = 'FAILURE'
                     AND login_at < DATE_SUB(CURRENT_TIMESTAMP, INTERVAL 6 MONTH))"""
            )
            await cursor.execute(
                """DELETE FROM activity_logs
                   WHERE action_at < DATE_SUB(CURRENT_TIMESTAMP, INTERVAL 2 YEAR)"""
            )
            await connection.commit()


# ─────────────────────────────────────────────────────────────────────────
# 라이프사이클: 앱 시작/종료
# ─────────────────────────────────────────────────────────────────────────


@asynccontextmanager
async def lifespan(app: FastAPI):
    """FastAPI 라이프사이클 관리"""
    # 시작
    logger.info(f"[{ENVIRONMENT}] 앱 시작 중...")

    # 프론트엔드 빌드 (필수)
    build_frontend()

    # 개발 환경에서 개발 서버 실행 (선택사항)
    if ENVIRONMENT == "development":
        serve_frontend_dev()

    # DB 풀 초기화
    await init_db_pool()
    logger.info("✓ DB 풀 초기화 완료")
    if ADMIN_EMAIL:
        pool = get_db_pool()
        async with pool.acquire() as connection, connection.cursor() as cursor:
            await cursor.execute(
                "UPDATE users SET role = 'SYSTEM_ADMIN' WHERE email = %s", (ADMIN_EMAIL.lower(),)
            )
            await connection.commit()
    cleanup_task = asyncio.create_task(cleanup_expired_sessions())
    resource_task = asyncio.create_task(sample_resources_loop())

    yield

    # 종료
    logger.info("앱 종료 중...")
    cleanup_task.cancel()
    resource_task.cancel()
    await close_db_pool()
    logger.info("✓ DB 풀 종료 완료")


# ─────────────────────────────────────────────────────────────────────────
# FastAPI 앱 생성
# ─────────────────────────────────────────────────────────────────────────
app = FastAPI(
    title="임도 설계 및 견적 자동화",
    description="Forest Road Design & Estimation API",
    version="0.1.0",
    debug=DEBUG,
    lifespan=lifespan,
)

# ─────────────────────────────────────────────────────────────────────────
# CORS 미들웨어
# ─────────────────────────────────────────────────────────────────────────
app.add_middleware(
    CORSMiddleware,
    allow_origins=CORS_ORIGINS,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# ─────────────────────────────────────────────────────────────────────────
# 정적 파일 서빙 (프론트엔드)
# ─────────────────────────────────────────────────────────────────────────
if os.path.isdir(STATIC_DIR):
    app.mount(STATIC_URL, StaticFiles(directory=STATIC_DIR), name="static")
    logger.info(f"✓ 정적 파일 서빙: {STATIC_URL} → {STATIC_DIR}")
else:
    logger.warning(f"⚠ 정적 파일 디렉토리 없음: {STATIC_DIR}")

# ─────────────────────────────────────────────────────────────────────────
# 기본 엔드포인트
# ─────────────────────────────────────────────────────────────────────────


@app.get("/")
async def root():
    """루트 엔드포인트 — 프론트엔드 진입점 리다이렉트"""
    return {
        "message": "임도 설계 및 견적 자동화 API",
        "version": "0.1.0",
        "frontend": f"http://{SERVER_HOST}:{SERVER_PORT}{STATIC_URL}/",
    }


@app.get("/api/health")
async def health():
    """헬스 체크"""
    return {"status": "ok", "environment": ENVIRONMENT}


# ─────────────────────────────────────────────────────────────────────────
# 라우터 등록 (pages → API)
# ─────────────────────────────────────────────────────────────────────────
# 예: from A01_Home.A01_Home_Api_Fetch import router as a01_router
#     app.include_router(a01_router, prefix="/api/a01", tags=["A01_Home"])
#
# 나중에 각 페이지별 라우터가 구현되면 여기에 등록.
app.include_router(a06_login_router)
app.include_router(a07_register_router)
app.include_router(a08_support_router)
app.include_router(a09_security_router)
app.include_router(b01_dashboard_router)
protected = [Depends(verify_session)]
protected_with_company = [Depends(verify_session), Depends(require_company)]
app.include_router(b03_file_input_router, dependencies=protected_with_company)
app.include_router(b04_surface_router, dependencies=protected_with_company)
app.include_router(b05_route_router, dependencies=protected_with_company)
app.include_router(b06_section_router, dependencies=protected_with_company)

# ─────────────────────────────────────────────────────────────────────────
# 앱 실행
# ─────────────────────────────────────────────────────────────────────────
if __name__ == "__main__":
    import uvicorn

    logger.info(f"Starting server on {SERVER_HOST}:{SERVER_PORT}")
    uvicorn.run(
        "main:app",
        host=SERVER_HOST,
        port=SERVER_PORT,
        reload=DEBUG,
    )