// src/Webshop.Application/Services/Public/PaymentMethodService.cs
using System.Collections.Generic;
using System.Linq;
using System.Text.Json; // Für JSON-Verarbeitung
using System.Threading.Tasks;
using Webshop.Application.DTOs.Payments;
using Webshop.Domain.Enums;
using Webshop.Domain.Interfaces;


namespace Webshop.Application.Services.Public
{
    public class PaymentMethodService : IPaymentMethodService
    {
        private readonly IPaymentMethodRepository _paymentMethodRepository;

        public PaymentMethodService(IPaymentMethodRepository paymentMethodRepository)
        {
            _paymentMethodRepository = paymentMethodRepository;
        }

        public async Task<IEnumerable<PaymentMethodDto>> GetAllActiveAsync()
        {
            var paymentMethods = await _paymentMethodRepository.GetAllAsync();

            return paymentMethods
                .Where(pm => pm.IsActive)
                .Select(pm => new PaymentMethodDto
                {
                    Id = pm.Id,
                    Name = pm.Name,
                    Description = pm.Description,
                    PaymentGatewayType = pm.PaymentGatewayType,
                    ProcessingFee = pm.ProcessingFee,
                    PublicConfiguration = GetPublicConfiguration(pm.PaymentGatewayType, pm.Configuration)
                }).ToList();
        }

        private object? GetPublicConfiguration(PaymentGatewayType type, string? configJson)
        {
            if (string.IsNullOrEmpty(configJson)) return null;

            // Beispiel: Nur für BankTransfer geben wir IBAN etc. preis
            if (type == PaymentGatewayType.BankTransfer)
            {
                var config = JsonSerializer.Deserialize<Dictionary<string, string>>(configJson);
                if (config != null)
                {
                    // Filter, um geheime Schlüssel NICHT an das Frontend zu senden
                    return new { IBAN = config.GetValueOrDefault("IBAN"), BIC = config.GetValueOrDefault("BIC"), BankName = config.GetValueOrDefault("BankName") };
                }
            }

            // Für Stripe/PayPal geben wir nur den Public Key preis
            if (type == PaymentGatewayType.Stripe)
            {
                var config = JsonSerializer.Deserialize<Dictionary<string, string>>(configJson);
                if (config != null)
                {
                    return new { PublicKey = config.GetValueOrDefault("PublicKey") };
                }
            }

            return null; // Für andere Typen geben wir keine Konfigurationsdetails preis
        }
    }
}