from flask import Flask, request, Response
import logging
from config import config
from handlers.registry import HandlerRegistry
from utils.rss_generator import RSSGenerator

# 配置日志
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

def create_app(config_name='default'):
    app = Flask(__name__)
    app.config.from_object(config[config_name])
    
    # 初始化处理器注册中心
    handler_registry = HandlerRegistry()
    
    # 初始化RSS生成器
    rss_generator = RSSGenerator(
        title=app.config['RSS_TITLE'],
        description=app.config['RSS_DESCRIPTION'],
        link=app.config['RSS_LINK'],
        language=app.config['RSS_LANGUAGE']
    )
    
    @app.route('/')
    def index():
        """API文档页面"""
        available_handlers = handler_registry.list_handlers()
        docs = f"""
        <h1>Crypto RSS Service</h1>
        <h2>可用的RSS订阅源：</h2>
        <ul>
        """
        
        for handler_name in available_handlers:
            if handler_name == 'crypto':
                docs += f"""
                <li><a href="/rss/{handler_name}?pair=ETH-USDT">/rss/{handler_name}?pair=ETH-USDT</a> - ETH价格</li>
                <li><a href="/rss/{handler_name}?pair=BTC-USDT">/rss/{handler_name}?pair=BTC-USDT</a> - BTC价格</li>
                """
        
        docs += """
        </ul>
        <h2>使用说明：</h2>
        <p>将RSS链接粘贴到您的墨水屏RSS阅读器中即可。</p>
        """
        return docs
    
    @app.route('/rss/<handler_name>')
    def rss_feed(handler_name):
        """RSS订阅源端点"""
        handler = handler_registry.get_handler(handler_name)
        
        if not handler:
            return Response("Handler not found", status=404)
        
        try:
            # 获取查询参数
            request_params = request.args.to_dict()
            
            # 让处理器处理请求
            items = handler.handle(**request_params)
            
            if not items:
                return Response("No data available", status=204)
            
            if handler_name == 'crypto':
                motdTitle = request_params.get('pair', app.config['DEFAULT_CRYPTO_PAIR'])
                motdTitle = motdTitle.replace('-', '/').upper()
                rss_xml = rss_generator.generate_rss(items, motdTitle=motdTitle)
            else:
                rss_xml = rss_generator.generate_rss(items)
            
            return Response(rss_xml, mimetype='application/rss+xml')

            
        except Exception as e:
            logger.error(f"生成RSS时出错: {e}")
            error_items = [{
                "title": "服务暂时不可用",
                "description": f"生成RSS时出现错误: {str(e)}",
                "link": app.config['RSS_LINK']
            }]
            rss_xml = rss_generator.generate_rss(error_items)
            return Response(rss_xml, mimetype='application/rss+xml', status=500)
    
    @app.route('/health')
    def health_check():
        """健康检查端点"""
        return {"status": "healthy", "available_handlers": handler_registry.list_handlers()}
    
    return app

if __name__ == '__main__':
    app = create_app('development')
    app.run(host='0.0.0.0', port=5000, debug=True)