const express = require('express');
const { query, validationResult } = require('express-validator');
const { authorize } = require('../middleware/auth');
const reportsController = require('../controllers/reportsController');

const router = express.Router();

// Validation middleware
const handleValidationErrors = (req, res, next) => {
  const errors = validationResult(req);
  if (!errors.isEmpty()) {
    return res.status(400).json({
      success: false,
      message: 'Validation failed',
      errors: errors.array()
    });
  }
  next();
};

// Date range validation
const dateRangeValidation = [
  query('startDate')
    .optional()
    .isISO8601()
    .withMessage('Start date must be a valid ISO 8601 date'),
  query('endDate')
    .optional()
    .isISO8601()
    .withMessage('End date must be a valid ISO 8601 date'),
  query('groupBy')
    .optional()
    .isIn(['day', 'week', 'month', 'quarter', 'year'])
    .withMessage('Group by must be day, week, month, quarter, or year'),
  query('format')
    .optional()
    .isIn(['json', 'csv'])
    .withMessage('Format must be json or csv')
];

// Export validation
const exportValidation = [
  query('reportType')
    .isIn(['sales', 'usage', 'commission'])
    .withMessage('Report type must be sales, usage, or commission'),
  query('format')
    .optional()
    .isIn(['json', 'csv', 'pdf'])
    .withMessage('Format must be json, csv, or pdf')
];

// Sales report
router.get('/sales', dateRangeValidation, handleValidationErrors, reportsController.getSalesReport);

// Usage report
router.get('/usage', [
  ...dateRangeValidation,
  query('customerId')
    .optional()
    .isUUID()
    .withMessage('Customer ID must be a valid UUID'),
  query('productId')
    .optional()
    .isUUID()
    .withMessage('Product ID must be a valid UUID')
], handleValidationErrors, reportsController.getUsageReport);

// Commission report
router.get('/commission', [
  ...dateRangeValidation,
  query('status')
    .optional()
    .isIn(['all', 'pending', 'approved', 'paid', 'disputed', 'cancelled'])
    .withMessage('Invalid commission status')
], handleValidationErrors, reportsController.getCommissionReport);

// Export reports
router.get('/export', exportValidation, handleValidationErrors, reportsController.exportReport);

module.exports = router;