// /components/payments/paymentValidator.js
'use strict';

const AppError = require('../../utils/AppError');

const PAYMENT_METHODS = new Set(['online', 'card', 'cash']);
const TRANSACTION_STATUSES = new Set(['pending', 'paid']);

const passThrough = (req, res, next) => next();

const validateTransactionBody = (body, { requireAmount = true } = {}) => {
  const details = {};

  if (requireAmount && (body.amount === undefined || body.amount === null || Number(body.amount) <= 0)) {
    details.amount = 'مبلغ تراکنش باید بیشتر از صفر باشد';
  } else if (body.amount !== undefined && Number(body.amount) < 0) {
    details.amount = 'مبلغ تراکنش نمی‌تواند منفی باشد';
  }

  if (body.status !== undefined && !TRANSACTION_STATUSES.has(body.status)) {
    details.status = 'وضعیت تراکنش نامعتبر است';
  }

  if (body.method !== undefined && body.method !== '' && !PAYMENT_METHODS.has(body.method)) {
    details.method = 'روش پرداخت نامعتبر است';
  }

  if (body.notes !== undefined && String(body.notes).length > 5000) {
    details.notes = 'یادداشت نباید بیش از ۵۰۰۰ کاراکتر باشد';
  }

  if (Object.keys(details).length) {
    throw new AppError('VALIDATION_FAILED', details);
  }
};

const validateAddTransaction = (req, res, next) => {
  try {
    validateTransactionBody(req.body || {}, { requireAmount: true });
    next();
  } catch (err) {
    next(err);
  }
};

const validateUpdateTransaction = (req, res, next) => {
  try {
    validateTransactionBody(req.body || {}, { requireAmount: false });
    next();
  } catch (err) {
    next(err);
  }
};

module.exports = {
  validateCreatePayment: passThrough,
  validateUpdatePayment: passThrough,
  validateAddTransaction,
  validateUpdateTransaction
};