import logging
import os
from flask import Flask, send_from_directory, send_file
from flask_cors import CORS
from .config import Config
from .logging_config import configure_logging
from .routes import bp as api_bp


def create_app(config_class: type[Config] = Config) -> Flask:
    configure_logging()
    
    # 设置静态文件目录
    static_folder = os.path.join(os.path.dirname(__file__), 'web', 'dist')
    app = Flask(__name__, static_folder=static_folder, static_url_path='')
    app.config.from_object(config_class)

    # CORS
    CORS(app, resources={r"/api/*": {"origins": app.config.get("CORS_ORIGINS", "*")}})

    # Blueprints
    app.register_blueprint(api_bp)

    # 静态文件路由
    @app.route('/')
    def serve_index():
        """服务主页面"""
        return send_file(os.path.join(app.static_folder, 'index.html'))
    
    @app.route('/<path:path>')
    def serve_static(path):
        """服务其他静态文件"""
        try:
            return send_from_directory(app.static_folder, path)
        except FileNotFoundError:
            # 如果文件不存在，返回主页面（用于SPA路由）
            return send_file(os.path.join(app.static_folder, 'index.html'))

    # Error handlers -> JSON
    @app.errorhandler(413)
    def too_large(_):
        return {"success": False, "error": "上传文件过大"}, 413

    @app.errorhandler(404)
    def not_found(_):
        return {"success": False, "error": "未找到"}, 404

    @app.errorhandler(Exception)
    def all_errors(e):
        logging.getLogger(__name__).exception("Unhandled error")
        return {"success": False, "error": str(e)}, 500

    return app