import 'package:dio/dio.dart';
import 'package:eatvio_app/features/chat/models/payment_model.dart';
import 'package:eatvio_app/features/chat/services/chat_service.dart';
import 'package:eatvio_app/features/payment/models/promo_applied_list_response.dart';
import 'package:eatvio_app/features/payment/models/promo_apply_response.dart';
import 'package:eatvio_app/features/payment/models/promo_code_model.dart';
import 'package:eatvio_app/features/payment/models/promo_remove_response.dart';
import 'package:eatvio_app/features/payment/models/promo_validate_response.dart';

/// Репозиторий оплаты консультаций (chosen_plan) через Alfa Bank / СБП.
class PaymentRepository {
  final ChatService chatService;

  PaymentRepository({required this.chatService});

  /// Запускает процесс оплаты: POST `/api/chosen_plans/{id}/start_payment_process`
  /// с `payment_provider: alfa-bank`.
  Future<PaymentModel> startPaymentProcess({required int planId}) async {
    return chatService.getPaymentLink(
      id: planId,
      body: const {'payment_provider': 'alfa-bank'},
    );
  }

  /// Список applied-промокодов текущего пользователя.
  Future<PromoAppliedListResponse> listAppliedPromoCodes() {
    return chatService.listAppliedPromoCodes();
  }

  /// Applied-промокод для конкретного chosen_plan, либо null (нет / ошибка сети).
  Future<PromoCodeModel?> findAppliedPromoForPlan(int planId) async {
    try {
      final response = await listAppliedPromoCodes();
      for (final promo in response.promoCodes) {
        if (promo.chosenPlanId == planId && promo.state == 'applied') {
          return promo;
        }
      }
      return null;
    } catch (_) {
      return null;
    }
  }

  /// Preview-валидация промокода без применения.
  Future<PromoValidateResponse> validatePromoCode({
    required int planId,
    required String promoCode,
  }) {
    return chatService.validatePromoCode(
      id: planId,
      body: {'promo_code': promoCode},
    );
  }

  /// Применяет промокод к chosen_plan. При HTTP 422 возвращает тело ответа.
  Future<PromoApplyResponse> applyPromoCode({
    required int planId,
    required String promoCode,
  }) async {
    try {
      return await chatService.applyPromoCode(
        id: planId,
        body: {'promo_code': promoCode},
      );
    } on DioException catch (e) {
      final data = e.response?.data;
      if (data is Map<String, dynamic>) {
        return PromoApplyResponse.fromJson(data);
      }
      rethrow;
    }
  }

  /// Удаляет применённый промокод (idempotent).
  Future<PromoRemoveResponse> removePromoCode({required int planId}) async {
    try {
      return await chatService.removePromoCode(id: planId);
    } on DioException catch (e) {
      final data = e.response?.data;
      if (data is Map<String, dynamic>) {
        return PromoRemoveResponse.fromJson(data);
      }
      rethrow;
    }
  }
}