#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
知识管理平台自动化工具 - 多用户版本

说明（P0–P3 优化后）：
- `app.py` 仅保留启动/装配层
- 路由拆分到 `routes/`（Blueprint）
- 业务拆分到 `services/`（tasks/screenshots/scheduler/...）
- SocketIO 事件拆分到 `realtime/`
"""

from __future__ import annotations

import atexit
import os
import signal
import sys
import threading

from flask import Flask, jsonify, redirect, request, send_from_directory, url_for
from flask_login import LoginManager
from flask_socketio import SocketIO

import database
import db_pool
import email_service
from app_config import get_config
from app_logger import get_logger, init_logging
from app_security import is_safe_path
from browser_pool_worker import init_browser_worker_pool, shutdown_browser_worker_pool
from realtime.socketio_handlers import register_socketio_handlers
from realtime.status_push import status_push_worker
from routes import register_blueprints
from services.browser_manager import init_browser_manager
from services.checkpoints import init_checkpoint_manager
from services.maintenance import start_cleanup_scheduler
from services.models import User
from services.runtime import init_runtime
from services.scheduler import scheduled_task_worker
from services.state import safe_iter_user_accounts_items
from services.tasks import get_task_scheduler


# ==================== 进程级基础设置 ====================

# 设置时区为中国标准时间（CST, UTC+8）
os.environ["TZ"] = "Asia/Shanghai"
try:
    import time as _time

    _time.tzset()
except Exception:
    pass


def _sigchld_handler(signum, frame):
    """SIGCHLD 信号处理器 - 自动回收僵尸子进程（Docker PID 1 场景）"""
    while True:
        try:
            pid, _ = os.waitpid(-1, os.WNOHANG)
            if pid == 0:
                break
        except ChildProcessError:
            break
        except Exception:
            break


if os.name != "nt":
    signal.signal(signal.SIGCHLD, _sigchld_handler)


# ==================== Flask / SocketIO 装配 ====================

config = get_config()

app = Flask(__name__)
app.config.from_object(config)

if not app.config.get("SECRET_KEY"):
    raise RuntimeError("SECRET_KEY未配置，请检查 app_config.py 或环境变量")

cors_origins = os.environ.get("CORS_ALLOWED_ORIGINS", "").strip()
cors_allowed = [o.strip() for o in cors_origins.split(",") if o.strip()] if cors_origins else []

socketio = SocketIO(
    app,
    cors_allowed_origins=cors_allowed if cors_allowed else None,
    async_mode="threading",
    ping_timeout=60,
    ping_interval=25,
    logger=False,
    engineio_logger=False,
)

init_logging(log_level=config.LOG_LEVEL, log_file=config.LOG_FILE)
logger = get_logger("app")
init_runtime(socketio=socketio, logger=logger)

# 注册 Blueprint（路由不变）
register_blueprints(app)

# 注册 SocketIO 事件
register_socketio_handlers(socketio)


# ==================== Flask-Login 配置 ====================

login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = "pages.login_page"


@login_manager.user_loader
def load_user(user_id: str):
    user = database.get_user_by_id(int(user_id))
    if user:
        return User(user["id"])
    return None


@login_manager.unauthorized_handler
def unauthorized():
    """未授权访问：API 返回 JSON，页面重定向登录页（行为保持不变）。"""
    if request.path.startswith("/api/") or request.path.startswith("/yuyx/api/"):
        return jsonify({"error": "请先登录", "code": "unauthorized"}), 401
    return redirect(url_for("pages.login_page", next=request.url))


# ==================== 静态文件（保持 endpoint 名称不变） ====================


@app.route("/static/<path:filename>")
def serve_static(filename):
    if not is_safe_path("static", filename):
        return jsonify({"error": "非法路径"}), 403

    response = send_from_directory("static", filename)
    response.headers["Cache-Control"] = "no-store, no-cache, must-revalidate, max-age=0"
    response.headers["Pragma"] = "no-cache"
    response.headers["Expires"] = "0"
    return response


# ==================== 退出清理 ====================


def cleanup_on_exit():
    logger.info("正在清理资源...")

    logger.info("- 停止运行中的任务...")
    try:
        for _, accounts in safe_iter_user_accounts_items():
            for acc in accounts.values():
                if getattr(acc, "is_running", False):
                    acc.should_stop = True
    except Exception:
        pass

    logger.info("- 停止任务调度器...")
    try:
        scheduler = get_task_scheduler()
        scheduler.shutdown(timeout=5)
    except Exception:
        pass

    logger.info("- 关闭浏览器线程池...")
    try:
        shutdown_browser_worker_pool()
    except Exception:
        pass

    logger.info("- 关闭邮件队列...")
    try:
        email_service.shutdown_email_queue()
    except Exception:
        pass

    logger.info("- 关闭数据库连接池...")
    try:
        db_pool._pool.close_all() if db_pool._pool else None
    except Exception:
        pass

    logger.info("✓ 资源清理完成")


# ==================== 启动入口（保持 python app.py 可用） ====================


def _signal_handler(sig, frame):
    logger.info("收到退出信号，正在关闭...")
    cleanup_on_exit()
    sys.exit(0)


if __name__ == "__main__":
    atexit.register(cleanup_on_exit)
    signal.signal(signal.SIGINT, _signal_handler)
    signal.signal(signal.SIGTERM, _signal_handler)

    logger.info("=" * 60)
    logger.info("知识管理平台自动化工具 - 多用户版")
    logger.info("=" * 60)

    database.init_database()
    init_checkpoint_manager()
    logger.info("✓ 任务断点管理器已初始化")

    try:
        email_service.init_email_service()
        logger.info("✓ 邮件服务已初始化")
    except Exception as e:
        logger.warning(f"警告: 邮件服务初始化失败: {e}")

    start_cleanup_scheduler()

    try:
        system_config = database.get_system_config() or {}
        max_concurrent_global = int(system_config.get("max_concurrent_global", config.MAX_CONCURRENT_GLOBAL))
        max_concurrent_per_account = int(system_config.get("max_concurrent_per_account", config.MAX_CONCURRENT_PER_ACCOUNT))
        get_task_scheduler().update_limits(max_global=max_concurrent_global, max_per_user=max_concurrent_per_account)
        logger.info(f"✓ 已加载并发配置: 全局={max_concurrent_global}, 单账号={max_concurrent_per_account}")
    except Exception as e:
        logger.warning(f"警告: 加载并发配置失败,使用默认值: {e}")

    logger.info("正在初始化浏览器管理器...")
    init_browser_manager()

    logger.info("启动定时任务调度器...")
    threading.Thread(target=scheduled_task_worker, daemon=True, name="scheduled-task-worker").start()
    logger.info("✓ 定时任务调度器已启动")

    logger.info("✓ 状态推送线程已启动（默认2秒/次）")
    threading.Thread(target=status_push_worker, daemon=True, name="status-push-worker").start()

    logger.info("服务器启动中...")
    logger.info(f"用户访问地址: http://{config.SERVER_HOST}:{config.SERVER_PORT}")
    logger.info(f"后台管理地址: http://{config.SERVER_HOST}:{config.SERVER_PORT}/yuyx")
    logger.info("默认管理员: admin (首次运行随机密码见日志)")
    logger.info("=" * 60)

    try:
        pool_size = int((database.get_system_config() or {}).get("max_screenshot_concurrent", 3))
    except Exception:
        pool_size = 3
    try:
        logger.info(f"初始化截图线程池（{pool_size}个worker，按需启动浏览器，空闲5分钟后自动关闭）...")
        init_browser_worker_pool(pool_size=pool_size)
        logger.info("✓ 截图线程池初始化完成")
    except Exception as e:
        logger.warning(f"警告: 截图线程池初始化失败: {e}")

    socketio.run(
        app,
        host=config.SERVER_HOST,
        port=config.SERVER_PORT,
        debug=config.DEBUG,
        allow_unsafe_werkzeug=True,
    )