const config = require('../config');

class ApiResponse {
  constructor(success, statusCode, data = null, message = null, errors = null) {
    this.success = success;
    this.statusCode = statusCode;
    this.data = data;
    this.message = message;
    this.errors = errors;
    this.timestamp = new Date().toISOString();
  }

  toJSON() {
    const response = {
      success: this.success,
      timestamp: this.timestamp,
    };

    if (this.message) response.message = this.message;
    if (this.data !== null) response.data = this.data;
    if (this.errors) response.errors = this.errors;

    return response;
  }
}

class ResponseHandler {
  static success(res, data, message = 'Success', statusCode = config.HTTP_STATUS.OK) {
    const response = new ApiResponse(true, statusCode, data, message);
    return res.status(statusCode).json(response.toJSON());
  }

  static created(res, data, message = 'Resource created successfully') {
    return this.success(res, data, message, config.HTTP_STATUS.CREATED);
  }

  static error(
    res,
    message,
    statusCode = config.HTTP_STATUS.INTERNAL_SERVER_ERROR,
    errors = null
  ) {
    const response = new ApiResponse(false, statusCode, null, message, errors);
    return res.status(statusCode).json(response.toJSON());
  }

  static badRequest(res, message = 'Bad request', errors = null) {
    return this.error(res, message, config.HTTP_STATUS.BAD_REQUEST, errors);
  }

  static notFound(res, message = 'Resource not found') {
    return this.error(res, message, config.HTTP_STATUS.NOT_FOUND);
  }

  static unauthorized(res, message = 'Unauthorized') {
    return this.error(res, message, config.HTTP_STATUS.UNAUTHORIZED);
  }

  static forbidden(res, message = 'Forbidden') {
    return this.error(res, message, config.HTTP_STATUS.FORBIDDEN);
  }

  static conflict(res, message = 'Resource conflict', errors = null) {
    return this.error(res, message, config.HTTP_STATUS.CONFLICT, errors);
  }

  static internalError(res, message = 'Internal server error', error = null) {
    if (error && config.isDevelopment) {
      console.error('Internal Error:', error);
    }
    return this.error(res, message, config.HTTP_STATUS.INTERNAL_SERVER_ERROR);
  }
}

module.exports = ResponseHandler;