import logging
from fastapi import FastAPI, Depends, HTTPException, Request
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from fastapi.responses import FileResponse
from sqlalchemy.orm import Session
from datetime import datetime
from pathlib import Path

from .database import engine, get_db, init_db
from .models import Base
from .api import topics, system, articles, publishing, auth, admin, audit, optimizer_logs, cases, task_logs, llm_configs, system_configs, topic_config, calendar, metrics, assets, tasks, platform_config, collector_mgmt, assistant
from .initial_data import import_initial_data
from .core.scheduler import scheduler

app = FastAPI(title="宇之然内容创作平台", version="0.1.0")
logger = logging.getLogger(__name__)


@app.on_event("startup")
def start_scheduler():
    scheduler.start()
    logger.info("Background scheduler started")


@app.on_event("shutdown")
def stop_scheduler():
    scheduler.shutdown()
    logger.info("Background scheduler shut down")

# CORS - local-only origins
_local_origins = [
    "http://localhost:8001",
    "http://127.0.0.1:8001",
    "http://localhost:8000",
    "http://127.0.0.1:8000",
]
app.add_middleware(
    CORSMiddleware,
    allow_origins=_local_origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# 初始化数据库
Base.metadata.create_all(bind=engine)
init_db()
import_initial_data()

# 清理超时任务（运行超过 1 小时的任务视为故障）
from datetime import datetime, timezone, timedelta
from .database import SessionLocal
from .models import ContentTask
try:
    cleanup_db = SessionLocal()
    cutoff = datetime.now(timezone.utc) - timedelta(hours=1)
    stale = cleanup_db.query(ContentTask).filter(
        ContentTask.status == "running",
        ContentTask.started_at.isnot(None),
        ContentTask.started_at < cutoff
    ).all()
    for t in stale:
        t.status = "failed"
        t.error_msg = "任务超时（服务重启导致状态丢失）"
        if t.started_at:
            t.duration = int((datetime.now(timezone.utc) - t.started_at).total_seconds())
        logger.warning(f"标记超时任务: {t.task_id}")
    if stale:
        cleanup_db.commit()
        logger.info(f"已清理 {len(stale)} 个超时任务")
    cleanup_db.close()
except Exception as e:
    logger.warning(f"任务清理失败: {e}")

# 注册 API 路由
app.include_router(topics.router)
app.include_router(system.router)
app.include_router(articles.router)
app.include_router(publishing.router)
app.include_router(auth.router)
app.include_router(admin.router)
app.include_router(audit.router)
app.include_router(optimizer_logs.router)
app.include_router(cases.router)
app.include_router(task_logs.router)
app.include_router(llm_configs.router)
app.include_router(system_configs.router)
app.include_router(topic_config.router)
app.include_router(calendar.router)
app.include_router(metrics.router)
app.include_router(assets.router)
app.include_router(tasks.router)
app.include_router(platform_config.router)
app.include_router(collector_mgmt.router)
app.include_router(assistant.router)

# 挂载前端
FRONTEND_DIR = Path(__file__).parent.parent.parent / "frontend"
if FRONTEND_DIR.exists() and (FRONTEND_DIR / "index.html").exists():
    app.mount("/", StaticFiles(directory=str(FRONTEND_DIR), html=True), name="frontend")
    logger.info(f"Frontend mounted at / from {FRONTEND_DIR}")

    # SW 特殊处理
    sw_path = FRONTEND_DIR / "sw.js"
    if sw_path.exists():
        @app.get("/sw.js")
        async def service_worker():
            return FileResponse(
                sw_path,
                media_type="application/javascript",
                headers={"Cache-Control": "no-cache", "Service-Worker-Allowed": "/"}
            )

    # 离线页面
    offline_path = FRONTEND_DIR / "offline.html"
    if offline_path.exists():
        @app.get("/offline.html")
        async def offline_page():
            return FileResponse(offline_path, media_type="text/html")
else:
    @app.get("/")
    def root():
        return {"service": "API only", "docs": "/docs"}

if __name__ == "__main__":
    import uvicorn
    uvicorn.run("app.main:app", host="0.0.0.0", port=8001)