const express = require('express');
const router = express.Router();
const shippingService = require('../services/shippingService.js');
const config = require('../config');

module.exports = (pool, query, authMiddleware) => {
  // Apply authentication middleware to all routes
  router.use(authMiddleware);
  
  /**
   * Get shipping rates
   * POST /api/shipping/rates
   * 
   * Request Body:
   * {
   *   address: {
   *     name: string,
   *     street: string,
   *     city: string,
   *     state: string,
   *     zip: string,
   *     country: string,
   *     email: string
   *   },
   *   parcel: {
   *     length: number,
   *     width: number,
   *     height: number,
   *     weight: number,
   *     order_total: number
   *   },
   *   items: [{ id, quantity, weight_grams }]  // Optional cart items for weight calculation
   * }
   */
  router.post('/rates', async (req, res, next) => {
    try {
      const { address, parcel, items } = req.body;
      
      // Shipping must be enabled
      if (!config.shipping.enabled) {
        return res.status(400).json({
          error: true,
          message: 'Shipping is currently disabled'
        });
      }
      
      // Validate required fields
      if (!address || !parcel) {
        return res.status(400).json({
          error: true,
          message: 'Address and parcel information are required'
        });
      }
      
      // If address is a string, parse it
      const parsedAddress = typeof address === 'string' 
        ? shippingService.parseAddressString(address)
        : address;
      
      // Calculate total weight if items are provided
      if (items && items.length > 0) {
        parcel.weight = shippingService.calculateTotalWeight(items);
      }
      
      // Get shipping rates
      const rates = await shippingService.getShippingRates(
        null, // Use default from config
        parsedAddress,
        {
          ...parcel,
          order_total: parcel.order_total || 0
        }
      );
      
      res.json({
        success: true,
        rates
      });
    } catch (error) {
      console.error('Error getting shipping rates:', error);
      next(error);
    }
  });
  
  /**
   * Validate shipping address
   * POST /api/shipping/validate-address
   * 
   * Request Body:
   * {
   *   address: {
   *     name: string,
   *     street: string,
   *     city: string,
   *     state: string,
   *     zip: string,
   *     country: string,
   *     email: string
   *   }
   * }
   */
  router.post('/validate-address', async (req, res, next) => {
    try {
      const { address } = req.body;
      
      // Shipping must be enabled
      if (!config.shipping.enabled) {
        return res.status(400).json({
          error: true,
          message: 'Shipping is currently disabled'
        });
      }
      
      // Validate required fields
      if (!address) {
        return res.status(400).json({
          error: true,
          message: 'Address information is required'
        });
      }
      
      // If EasyPost is not enabled, just perform basic validation
      if (!config.shipping.easypostEnabled || !config.shipping.easypostApiKey) {
        const isValid = validateAddressFormat(address);
        
        return res.json({
          success: true,
          valid: isValid,
          original_address: address,
          verified_address: address
        });
      }
      
      // If address is a string, parse it
      const parsedAddress = typeof address === 'string' 
        ? shippingService.parseAddressString(address)
        : address;
      
      // TODO: Implement EasyPost address verification
      // This would require making a call to EasyPost's API
      // For now, we'll return the original address
      
      res.json({
        success: true,
        valid: true,
        original_address: parsedAddress,
        verified_address: parsedAddress
      });
    } catch (error) {
      console.error('Error validating address:', error);
      next(error);
    }
  });
  return router;
};
  
  /**
   * Basic address format validation
   * @param {Object} address - Address to validate
   * @returns {boolean} Whether the address has valid format
   */
  function validateAddressFormat(address) {
    // Check required fields
    if (!address.street || !address.city || !address.zip || !address.country) {
      return false;
    }
    
    // Check zip code format - just basic validation
    if (address.country === 'US' && !/^\d{5}(-\d{4})?$/.test(address.zip)) {
      return false;
    }
    
    if (address.country === 'CA' && !/^[A-Za-z]\d[A-Za-z] \d[A-Za-z]\d$/.test(address.zip)) {
      return false;
    }
    
    return true;
  }