import 'dart:convert';
import 'package:http/http.dart' as http;
import '../models/coupon.dart';
import 'woocommerce_service.dart';

class CouponService {
  /// Validiert einen Gutschein-Code
  Future<Coupon> validateCoupon(String code) async {
    try {
      final queryParams = {
        'code': code,
        'status': 'publish',
        'consumer_key': WooCommerceService.consumerKey,
        'consumer_secret': WooCommerceService.consumerSecret,
      };
      
      final uri = Uri.parse('${WooCommerceService.baseUrl}/wp-json/wc/v3/coupons').replace(
        queryParameters: queryParams,
      );

      final response = await http.get(uri);

      if (response.statusCode == 200) {
        final List<dynamic> data = json.decode(response.body);
        
        if (data.isNotEmpty) {
          final couponData = data[0];
          return Coupon(
            code: couponData['code'] ?? code,
            description: couponData['description'],
            discountType: couponData['discount_type'] ?? 'fixed_cart',
            amount: couponData['amount'] ?? '0',
            isValid: true,
          );
        } else {
          return Coupon(
            code: code,
            discountType: 'fixed_cart',
            amount: '0',
            isValid: false,
            errorMessage: 'Gutschein-Code nicht gefunden',
          );
        }
      } else {
        return Coupon(
          code: code,
          discountType: 'fixed_cart',
          amount: '0',
          isValid: false,
          errorMessage: 'Fehler beim Validieren des Gutscheins',
        );
      }
    } catch (e) {
      return Coupon(
        code: code,
        discountType: 'fixed_cart',
        amount: '0',
        isValid: false,
        errorMessage: 'Fehler: $e',
      );
    }
  }

  /// Berechnet den Rabatt für einen Warenkorb
  double calculateDiscount(Coupon coupon, double cartTotal) {
    if (!coupon.isValid) return 0.0;

    final amount = double.tryParse(coupon.amount) ?? 0.0;

    switch (coupon.discountType) {
      case 'percent':
      case 'percent_product':
        return (cartTotal * amount) / 100;
      case 'fixed_cart':
      case 'fixed_product':
        return amount;
      default:
        return 0.0;
    }
  }
}