// src/Webshop.Application/Services/Public/PaymentMethodService.cs
using System.Collections.Generic;
using System.Linq;
using System.Text.Json;
using System.Threading.Tasks;
using Webshop.Application;
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<ServiceResult<IEnumerable<PaymentMethodDto>>> GetAllActiveAsync()
        {
            var paymentMethods = await _paymentMethodRepository.GetAllAsync();

            var activeMethods = 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();

            return ServiceResult.Ok<IEnumerable<PaymentMethodDto>>(activeMethods);
        }

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

            try
            {
                var config = JsonSerializer.Deserialize<Dictionary<string, JsonElement>>(configJson);
                if (config == null) return null;

                if (type == PaymentGatewayType.BankTransfer)
                {
                    return new
                    {
                        IBAN = config.ContainsKey("IBAN") ? config["IBAN"].GetString() : null,
                        BIC = config.ContainsKey("BIC") ? config["BIC"].GetString() : null,
                        BankName = config.ContainsKey("BankName") ? config["BankName"].GetString() : null
                    };
                }

                if (type == PaymentGatewayType.Stripe)
                {
                    return new { PublicKey = config.ContainsKey("PublicKey") ? config["PublicKey"].GetString() : null };
                }

                // Für PayPal oder andere geben wir keine öffentlichen Konfigurationsdetails preis
                return null;
            }
            catch (JsonException)
            {
                // Log error if needed, but return null to the client
                return null;
            }
        }
    }
}