import express from 'express';
import { transactionService } from '../services/transactionService.js';
import { authenticate, requireTenant, requireAdmin } from '../middleware/auth.js';
import { validateRequest } from '../middleware/validation.js';
import { body, param, query } from 'express-validator';
import { logger } from '../utils/logger.js';

const router = express.Router();

// Get transactions
router.get('/',
  authenticate,
  requireTenant,
  validateRequest([
    query('type').optional().isIn(['payment', 'refund', 'adjustment', 'fee']),
    query('status').optional().isIn(['pending', 'processing', 'succeeded', 'failed', 'canceled']),
    query('startDate').optional().isISO8601(),
    query('endDate').optional().isISO8601(),
    query('limit').optional().isInt({ min: 1, max: 100 }),
    query('offset').optional().isInt({ min: 0 })
  ]),
  async (req, res) => {
    try {
      const transactions = await transactionService.getTransactions(
        req.tenantId,
        req.query
      );

      res.json({
        success: true,
        transactions
      });
    } catch (error) {
      logger.error('Get transactions error:', error);
      res.status(500).json({
        success: false,
        error: 'Failed to get transactions'
      });
    }
  }
);

// Get transaction by ID
router.get('/:id',
  authenticate,
  requireTenant,
  validateRequest([
    param('id').isMongoId()
  ]),
  async (req, res) => {
    try {
      const transaction = await transactionService.getTransaction(
        req.tenantId,
        req.params.id
      );

      if (!transaction) {
        return res.status(404).json({
          success: false,
          error: 'Transaction not found'
        });
      }

      res.json({
        success: true,
        transaction
      });
    } catch (error) {
      logger.error('Get transaction error:', error);
      res.status(500).json({
        success: false,
        error: 'Failed to get transaction'
      });
    }
  }
);

// Create refund
router.post('/:id/refund',
  authenticate,
  requireTenant,
  validateRequest([
    param('id').isMongoId(),
    body('amount').optional().isFloat({ min: 0 }),
    body('reason').notEmpty(),
    body('metadata').optional().isObject()
  ]),
  async (req, res) => {
    try {
      const refund = await transactionService.createRefund(
        req.tenantId,
        req.params.id,
        {
          ...req.body,
          initiatedBy: req.user.id
        }
      );

      res.status(201).json({
        success: true,
        refund,
        message: 'Refund initiated successfully'
      });
    } catch (error) {
      logger.error('Create refund error:', error);
      res.status(500).json({
        success: false,
        error: 'Failed to create refund'
      });
    }
  }
);

// Get transaction summary
router.get('/summary/:period',
  authenticate,
  requireTenant,
  validateRequest([
    param('period').isIn(['daily', 'weekly', 'monthly', 'yearly']),
    query('startDate').optional().isISO8601(),
    query('endDate').optional().isISO8601()
  ]),
  async (req, res) => {
    try {
      const summary = await transactionService.getTransactionSummary(
        req.tenantId,
        req.params.period,
        {
          startDate: req.query.startDate,
          endDate: req.query.endDate
        }
      );

      res.json({
        success: true,
        summary
      });
    } catch (error) {
      logger.error('Get transaction summary error:', error);
      res.status(500).json({
        success: false,
        error: 'Failed to get transaction summary'
      });
    }
  }
);

// Export transactions
router.get('/export/:format',
  authenticate,
  requireTenant,
  validateRequest([
    param('format').isIn(['csv', 'pdf', 'excel']),
    query('startDate').optional().isISO8601(),
    query('endDate').optional().isISO8601()
  ]),
  async (req, res) => {
    try {
      const { filename, data } = await transactionService.exportTransactions(
        req.tenantId,
        req.params.format,
        {
          startDate: req.query.startDate,
          endDate: req.query.endDate
        }
      );

      // Set appropriate headers based on format
      const contentType = {
        csv: 'text/csv',
        pdf: 'application/pdf',
        excel: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
      };

      res.setHeader('Content-Type', contentType[req.params.format]);
      res.setHeader('Content-Disposition', `attachment; filename="${filename}"`);
      res.send(data);
    } catch (error) {
      logger.error('Export transactions error:', error);
      res.status(500).json({
        success: false,
        error: 'Failed to export transactions'
      });
    }
  }
);

// Admin: Create manual adjustment
router.post('/adjustment',
  authenticate,
  requireAdmin,
  validateRequest([
    body('tenantId').isMongoId(),
    body('type').isIn(['credit', 'debit']),
    body('amount').isFloat({ min: 0 }),
    body('currency').optional().isString(),
    body('reason').notEmpty(),
    body('metadata').optional().isObject()
  ]),
  async (req, res) => {
    try {
      const adjustment = await transactionService.createAdjustment({
        ...req.body,
        createdBy: req.user.id
      });

      res.status(201).json({
        success: true,
        adjustment,
        message: 'Adjustment created successfully'
      });
    } catch (error) {
      logger.error('Create adjustment error:', error);
      res.status(500).json({
        success: false,
        error: 'Failed to create adjustment'
      });
    }
  }
);

export default router;