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}">/rss/{handler_name}</a> - 默认加密货币价格</li>
                <li><a href="/rss/{handler_name}/eth/usdt">/rss/{handler_name}/eth/usdt</a> - ETH/USDT价格</li>
                <li><a href="/rss/{handler_name}/btc/usdt">/rss/{handler_name}/btc/usdt</a> - BTC/USDT价格</li>
                <li><a href="/rss/{handler_name}/ETH/USDC">/rss/{handler_name}/ETH/USDC</a> - ETH/USDC价格（大写）</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>
        <p>URL格式：/rss/crypto/[base_currency]/[quote_currency]</p>
        <p>例如：/rss/crypto/eth/usdc 或 /rss/crypto/ETH/USDC 都表示 ETH-USDC 交易对</p>
        <p>支持大小写混合格式</p>
        """
        return docs
    
    @app.route('/rss/<handler_name>')
    @app.route('/rss/<handler_name>/<path:base_currency>')
    @app.route('/rss/<handler_name>/<path:base_currency>/<path:quote_currency>')
    def rss_feed(handler_name, base_currency=None, quote_currency=None):
        """RSS订阅源端点"""
        handler = handler_registry.get_handler(handler_name)
        
        if not handler:
            return Response("Handler not found", status=404)
        
        try:
            # 构建请求参数
            request_params = {}
            
            # 处理crypto handler的特殊逻辑
            if handler_name == 'crypto':
                if base_currency and quote_currency:
                    # 将路径参数转换为pair格式
                    pair = f"{base_currency.upper()}-{quote_currency.upper()}"
                    request_params['pair'] = pair
                elif base_currency and not quote_currency:
                    # 只有base_currency，使用默认quote_currency (通常是USDC)
                    default_quote = 'USDC'  # 你可以在config中配置这个默认值
                    pair = f"{base_currency.upper()}-{default_quote}"
                    request_params['pair'] = pair
                else:
                    # 使用默认pair
                    request_params['pair'] = app.config.get('DEFAULT_CRYPTO_PAIR', 'BTC-USDT')
            
            # 合并其他查询参数（如果有的话）
            request_params.update(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.get('DEFAULT_CRYPTO_PAIR', 'BTC-USDT'))
                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

app = create_app('production')  # 生产环境使用production配置

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