using Grpc.Net.Client;
using Microsoft.eShopOnContainers.Web.Shopping.HttpAggregator.Config;
using Microsoft.eShopOnContainers.Web.Shopping.HttpAggregator.Models;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using System;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;
using GrpcOrdering;
using Grpc.Core;

namespace Microsoft.eShopOnContainers.Web.Shopping.HttpAggregator.Services
{
    public class OrderingService : IOrderingService
    {
        private readonly HttpClient _httpClient;
        private readonly UrlsConfig _urls;
        private readonly ILogger<OrderingService> _logger;

        public OrderingService(HttpClient httpClient, IOptions<UrlsConfig> config, ILogger<OrderingService> logger)
        {
            _httpClient = httpClient;
            _urls = config.Value;
            _logger = logger;
        }

        public async Task<OrderData> GetOrderDraftAsync(BasketData basketData)
        {
            AppContext.SetSwitch("System.Net.Http.SocketsHttpHandler.Http2UnencryptedSupport", true);
            AppContext.SetSwitch("System.Net.Http.SocketsHttpHandler.Http2Support", true);

            using (var httpClientHandler = new HttpClientHandler())
            {
                httpClientHandler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => { return true; };
                using (var httpClient = new HttpClient(httpClientHandler))
                {
                    httpClient.BaseAddress = new Uri(_urls.GrpcOrdering);

                    _logger.LogDebug(" Creating grpc client for ordering {@httpClient.BaseAddress}", httpClient.BaseAddress);

                    var client = GrpcClient.Create<OrderingGrpc.OrderingGrpcClient>(httpClient);

                    _logger.LogDebug(" grpc client created, basketData={@basketData}", basketData);

                    try
                    {

                        var command = MapToOrderDraftCommand(basketData);
                        var response = await client.CreateOrderDraftFromBasketDataAsync(command);

                        _logger.LogDebug(" grpc response: {@response}", response);

                        return MapToResponse(response);
                    }
                    catch (RpcException e)
                    {
                        _logger.LogError($"Error calling via grpc to ordering: {e.Status} - {e.Message}");
                    }
                }
            }

            return null;
        }

        private OrderData MapToResponse(GrpcOrdering.OrderDraftDTO orderDraft)
        {
            if (orderDraft == null)
            {
                return null;
            }

            var data = new OrderData
            {
                Total = (decimal)orderDraft.Total,
            };

            orderDraft.OrderItems.ToList().ForEach(o => data.OrderItems.Add(new OrderItemData
            {
                Discount = (decimal)o.Discount,
                PictureUrl = o.PictureUrl,
                ProductId = o.ProductId,
                ProductName = o.ProductName,
                UnitPrice = (decimal)o.UnitPrice,
                Units = o.Units,
            }));

            return data;
        }

        private CreateOrderDraftCommand MapToOrderDraftCommand(BasketData basketData)
        {
            var command = new CreateOrderDraftCommand
            {
                BuyerId = basketData.BuyerId,
            };

            basketData.Items.ForEach(i => command.Items.Add(new BasketItem
            {
                Id = i.Id,
                OldUnitPrice = (double)i.OldUnitPrice,
                PictureUrl = i.PictureUrl,
                ProductId = i.ProductId,
                ProductName = i.ProductName,
                Quantity = i.Quantity,
                UnitPrice = (double)i.UnitPrice,
            }));

            return command;
        }

    }
}