import os
import yaml
from flask import Flask, request, jsonify
from werkzeug.exceptions import HTTPException

app = Flask(__name__)

CONFIG_FILE = "config.yml"

# Load config from environment variable or default to config.yml
CONFIG_FILE = os.environ.get('CONFIG_FILE', 'config.yml')


def load_config():
    with open(CONFIG_FILE, "r") as f:
        return yaml.safe_load(f)


def save_config(config):
    with open(CONFIG_FILE, "w") as f:
        yaml.dump(config, f, default_flow_style=False)


@app.route('/', methods=['POST'])
def api_endpoint():
    try:
        data = request.get_json()
        action = data.get('action')

        config = load_config()

        if action == "ListRoutes":
            return jsonify({"routes": config['config']['lite']['routes']})
        elif action == "UpdateRoutes":
            new_routes = data.get('routes')
            if not isinstance(new_routes, list):
                # More specific exception
                raise ValueError("Invalid routes format")
            config['config']['lite']['routes'] = new_routes
            save_config(config)
            return jsonify({"message": "Routes updated successfully"})
        else:
            raise ValueError("Invalid action")  # More specific exception

    except FileNotFoundError:
        return jsonify({"error": "Config file not found"}), 500
    except yaml.YAMLError as e:
        return jsonify({"error": f"Error parsing YAML: {e}"}), 500
    except ValueError as e:
        # Return 400 for client-side errors
        return jsonify({"error": str(e)}), 400
    except HTTPException as e:
        # Handle HTTP exceptions gracefully
        return jsonify({"error": str(e)}), e.code
    except Exception as e:
        # Log unexpected error for debugging
        return jsonify({"error": f"An unexpected error occurred: {e}"}), 500

    # This is to ensure you handle all scenarios
    finally:
        pass


if __name__ == "__main__":
    app.run(host='0.0.0.0', port=int(os.environ.get('PORT', 5000)))