# 文件位置: app/__init__.py
# 文件名: __init__.py

"""
Flask应用工厂
"""
import os
import logging
from flask import Flask, render_template, jsonify
from flask_cors import CORS
from flask_socketio import SocketIO
from config import config

# 创建SocketIO实例
socketio = SocketIO()

def create_app(config_name=None):
    """创建Flask应用"""
    if config_name is None:
        config_name = os.environ.get('FLASK_CONFIG', 'development')
    
    # 创建Flask应用
    app = Flask(__name__)
    
    # 加载配置
    app.config.from_object(config[config_name])
    config[config_name].init_app(app)
    
    # 初始化扩展
    CORS(app, resources={r"/api/*": {"origins": "*"}})
    socketio.init_app(app, 
                      cors_allowed_origins="*",
                      async_mode='eventlet',
                      logger=True,
                      engineio_logger=True if app.debug else False)
    
    # 配置日志
    setup_logging(app)
    
    # 注册蓝图
    register_blueprints(app)
    
    # 注册WebSocket事件处理器
    with app.app_context():
        from app.routes.websocket import register_handlers
        register_handlers(socketio)
    
    # 注册错误处理器
    register_error_handlers(app)
    
    # 创建必要的目录
    create_directories(app)
    
    # 初始化任务管理器
    init_task_manager(app)
    
    app.logger.info(f'DeepResearch应用已创建，配置: {config_name}')
    
    return app

def register_blueprints(app):
    """注册所有蓝图"""
    from app.routes.main import main_bp
    from app.routes.api import api_bp
    from app.routes.frontend import frontend_bp
    
    # 先注册前端路由，确保 '/' 路由正确
    app.register_blueprint(frontend_bp)
    app.register_blueprint(api_bp, url_prefix='/api')
    app.register_blueprint(main_bp)
    
    app.logger.info('蓝图注册完成')

def register_error_handlers(app):
    """注册错误处理器"""
    
    @app.errorhandler(404)
    def not_found_error(error):
        if request.path.startswith('/api/'):
            return jsonify({'error': 'Not found'}), 404
        return render_template('404.html'), 404
    
    @app.errorhandler(500)
    def internal_error(error):
        app.logger.error(f'服务器错误: {error}')
        if request.path.startswith('/api/'):
            return jsonify({'error': 'Internal server error'}), 500
        return render_template('500.html'), 500
    
    @app.errorhandler(Exception)
    def unhandled_exception(error):
        app.logger.error(f'未处理的异常: {error}', exc_info=True)
        if request.path.startswith('/api/'):
            return jsonify({'error': str(error)}), 500
        return render_template('500.html'), 500

def setup_logging(app):
    """设置日志系统"""
    from app.utils.logger import setup_logging as logger_setup
    logger_setup(app)
    
    # 设置依赖库的日志级别
    logging.getLogger('werkzeug').setLevel(logging.WARNING)
    logging.getLogger('socketio').setLevel(logging.INFO if app.debug else logging.WARNING)
    logging.getLogger('engineio').setLevel(logging.INFO if app.debug else logging.WARNING)

def create_directories(app):
    """创建必要的目录"""
    directories = [
        app.config.get('DATA_DIR'),
        app.config.get('SESSIONS_DIR'),
        app.config.get('REPORTS_DIR'),
        app.config.get('CACHE_DIR'),
        app.config.get('LOG_DIR'),
        os.path.join(app.config.get('DATA_DIR'), 'debug')  # 调试日志目录
    ]
    
    for directory in directories:
        if directory and not os.path.exists(directory):
            os.makedirs(directory)
            app.logger.info(f'创建目录: {directory}')

def init_task_manager(app):
    """初始化任务管理器"""
    try:
        from app.services.task_manager import task_manager
        
        # 清理旧任务
        if hasattr(task_manager, 'cleanup_old_tasks'):
            cleaned = task_manager.cleanup_old_tasks(hours=24)
            app.logger.info(f'清理了 {cleaned} 个旧任务')
        
        app.logger.info('任务管理器初始化完成')
        
    except Exception as e:
        app.logger.error(f'任务管理器初始化失败: {e}')

# 导入必要的模块以避免导入错误
from flask import request

# 创建简单的错误页面模板（如果不存在）
def create_error_templates(app):
    """创建基本的错误页面模板"""
    templates_dir = os.path.join(app.root_path, 'templates')
    
    # 404页面
    error_404_path = os.path.join(templates_dir, '404.html')
    if not os.path.exists(error_404_path):
        error_404_content = '''
<!DOCTYPE html>
<html>
<head>
    <title>404 - 页面未找到</title>
    <style>
        body { font-family: Arial, sans-serif; text-align: center; padding: 50px; }
        h1 { color: #333; }
        a { color: #007bff; text-decoration: none; }
    </style>
</head>
<body>
    <h1>404 - 页面未找到</h1>
    <p>抱歉，您访问的页面不存在。</p>
    <p><a href="/">返回首页</a></p>
</body>
</html>
'''
        try:
            with open(error_404_path, 'w', encoding='utf-8') as f:
                f.write(error_404_content)
        except:
            pass
    
    # 500页面
    error_500_path = os.path.join(templates_dir, '500.html')
    if not os.path.exists(error_500_path):
        error_500_content = '''
<!DOCTYPE html>
<html>
<head>
    <title>500 - 服务器错误</title>
    <style>
        body { font-family: Arial, sans-serif; text-align: center; padding: 50px; }
        h1 { color: #dc3545; }
        a { color: #007bff; text-decoration: none; }
    </style>
</head>
<body>
    <h1>500 - 服务器错误</h1>
    <p>抱歉，服务器遇到了一个错误。</p>
    <p><a href="/">返回首页</a></p>
</body>
</html>
'''
        try:
            with open(error_500_path, 'w', encoding='utf-8') as f:
                f.write(error_500_content)
        except:
            pass

# 提供一个便捷的函数来获取socketio实例
def get_socketio():
    """获取socketio实例"""
    return socketio