using AyCode.Core.Extensions;
using AyCode.Utils.Extensions;
using Mango.Nop.Services;
using Nop.Plugin.Misc.AuctionPlugin.Hubs.Messages;
using Nop.Plugin.Misc.AuctionPlugin.Services;
using Nop.Services.Catalog;
using Nop.Services.Logging;
using Microsoft.AspNetCore.SignalR;
using Nop.Core;
using Nop.Core.Domain.Catalog;
using Nop.Plugin.Misc.AuctionPlugin.Domains.Enums;
using Nop.Core.Domain.Customers;
using Nop.Plugin.Misc.AuctionPlugin.Domains.Entities;
using Nop.Services.Customers;

namespace Nop.Plugin.Misc.AuctionPlugin.Hubs
{
    //- Dollár currency
    //- Pipa, ha tied a licit
    //- Pause, Lezárás, Revert, 

    //- ha saját licit  a legjobb vagy lezárt, ne lehessen bid-elni
    //- az előző esetben a kliensen a gombot is tiltani, már a.cshtml-ben ellenőrizni!


    //- csak a watch-olt item-eknél legyen announcment
    //- ha bid-elt 1x is, kerüljön a watch-ba
    //- DbTransaction-t vhogy megcsinánli!

    public class SignalRMessageHandler(ILogger logger, IProductService productService, AuctionService auctionService, IHubContext<AuctionHub> hubContext, IWorkContext workContext, ICustomerService customerService, ICategoryService categoryService)
    {
        private readonly Mutex _handleMessageMutex = new();

        public async Task HandleMessage(MessageWrapper messageWrapper, SessionItem sessionItem, string connectionId)
        {
            var customer = await workContext.GetCurrentCustomerAsync();
            //var connectionId = sessionItem?.SessionId;

            if (messageWrapper?.Data == null)
            {
                logger.Error($"SignalRMessageHandler.HandleMessage(); message?.Data == null; connectionId: {connectionId}", null, customer);
                return;
            }

            if (sessionItem == null || sessionItem.RequestCount != messageWrapper.RequestCount)
                await logger.WarningAsync($"SignalRMessageHandler.HandleMessage(); sessionItem == null || sessionItem.RequestCount != messageWrapper.RequestCount; connectionId: {connectionId}; sessionId: {sessionItem?.SessionId}; sessionRequests: {sessionItem?.RequestCount}; wrapperRequests: {messageWrapper.RequestCount}", null, customer);

            if (customer == null || messageWrapper.SenderId <= 0 || messageWrapper.SenderId != customer.Id || await customerService.IsGuestAsync(customer))
            {
                logger.Error($"SignalRMessageHandler.HandleMessage(); (customer == null || message.SenderId <= 0 || message.SenderId != customer.Id || IsGuestAsync() == true); connectionId: {connectionId}", null, customer);
                return;
            }

            await logger.InformationAsync($"SignalRMessageHandler.HandleMessage(); Before lock; MessageType: {messageWrapper.MessageType}; connectionId: {connectionId}; jsonData: {messageWrapper.Data}", null, customer);

            //TODO: az összes request-et egy base-ből származtatni és beletenni az AuctionRequestMode-ot! - J.
            using (_handleMessageMutex.UseWaitOne())
            {
                try
                {
                    await logger.InformationAsync($"SignalRMessageHandler.HandleMessage(); Enter lock; MessageType: {messageWrapper.MessageType}; connectionId: {connectionId}", null, customer);

                    if (messageWrapper.MessageType == "BidRequestMessage") await HandleBidRequest(customer, messageWrapper);
                    else
                    {
                        if (!await customerService.IsAdminAsync(customer))
                        {
                            logger.Error($"SignalRMessageHandler.HandleProductToAuctionStatusChangedRequest(); IsAdminAsync() == false; connectionId: {connectionId}", null, customer);
                            return;
                        }

                        switch (messageWrapper.MessageType)
                        {
                            case nameof(AuctionProductStatusRequest):
                                await HandleProductToAuctionStatusChangedRequest(customer, messageWrapper);
                                break;

                            case nameof(RevertAuctionBidRequest):
                                await HandleRevertAuctionBidRequest(customer, messageWrapper);
                                break;

                            default:
                                // Add other message types here
                                await logger.ErrorAsync($"SignalRMessageHandler.HandleMessage(); Unknown message type; MessageType: {messageWrapper.MessageType}; connectionId: {connectionId}", null, customer);
                                break;
                        }
                    }

                    await logger.InformationAsync($"SignalRMessageHandler.HandleMessage(); Exit lock; MessageType: {messageWrapper.MessageType}; connectionId: {connectionId}", null, customer);
                }
                catch (Exception ex)
                {
                    logger.Error($"SignalRMessageHandler.HandleMessage(); switch (message.MessageType); MessageType: {messageWrapper.MessageType}; connectionId: {connectionId}; Exception: {ex.Message}", ex, customer);
                }
            }
        }

        private async Task<ResponseType> HandleRevertAuctionBidRequest(Customer customer, MessageWrapper messageWrapper)
        {
            var revertAuctionBidRequest = messageWrapper.Data.JsonTo<RevertAuctionBidRequest>();
            if (revertAuctionBidRequest == null)
            {
                logger.Error($"SignalRMessageHandler.HandleRevertAuctionBidRequest(); auctionProductStatusRequest == null", null, customer);
                return ResponseType.Error;
            }

            try
            {
                var productToAuction = (await auctionService.GetProductToAuctionMappingByIdAsync(revertAuctionBidRequest.ProductToAuctionId));
                if (productToAuction is not { AuctionStatus: AuctionStatus.Pause })
                {
                    logger.Warning($"SignalRMessageHandler.HandleRevertAuctionBidRequest(); (productToAuction is not {{ AuctionStatus: AuctionStatus.Pause }}); AuctionStatus: {productToAuction?.AuctionStatus}", null, customer);
                    return ResponseType.Error;
                }

                await logger.InformationAsync($"SignalRMessageHandler.HandleRevertAuctionBidRequest(); (productToAuction is not {{ AuctionStatus: AuctionStatus.Pause }}); AuctionStatus: {productToAuction.AuctionStatus}", null, customer);

                var product = await auctionService.GetProductById(productToAuction.ProductId);
                if (product == null) return ResponseType.Error;

                var revertLastBid = await auctionService.RevertAuctionBidByProductToAuctionIdAsync(productToAuction.Id);

                if (revertLastBid == null) await ResetProductToAuction(productToAuction);
                else
                {
                    productToAuction.BidsCount = await auctionService.GetBidsCountByProductToAuctionIdAsync(productToAuction.Id);
                    await SetAuctionBidPrice(revertLastBid.BidPrice, productToAuction, product, revertLastBid.CustomerId);
                }

                await SendAuctionBidMessageAsync(messageWrapper, productToAuction, product, customer.Id);
                return ResponseType.ToAllClients;
            }
            catch (Exception ex)
            {
                logger.Error($"SignalRMessageHandler.HandleRevertAuctionBidRequest(); Exception: {ex.Message}", ex, customer);
            }

            return ResponseType.Error;
        }

        private async Task<ResponseType> HandleProductToAuctionStatusChangedRequest(Customer customer, MessageWrapper messageWrapper)
        {
            var auctionProductStatusRequest = messageWrapper.Data.JsonTo<AuctionProductStatusRequest>();
            if (auctionProductStatusRequest == null)
            {
                logger.Error($"SignalRMessageHandler.HandleProductToAuctionStatusChangedRequest(); auctionProductStatusRequest == null", null, customer);
                return ResponseType.Error;
            }

            try
            {
                var responseType = ResponseType.ToAllClients;
                await logger.InformationAsync($"SignalRMessageHandler.HandleProductToAuctionStatusChangedRequest(); ProductToAuctionMappingId: {auctionProductStatusRequest.ProductToAuctionId}; Status: {auctionProductStatusRequest.AuctionStatus}({(int)auctionProductStatusRequest.AuctionStatus})", null, customer);

                var productToAuction = await auctionService.GetProductToAuctionMappingByIdAsync(auctionProductStatusRequest.ProductToAuctionId);
                if (productToAuction == null)
                {
                    logger.Error($"SignalRMessageHandler.HandleProductToAuctionStatusChangedRequest(); (productToAuction == null)", null, customer);
                    return ResponseType.Error;
                }

                var auction = await auctionService.GetAuctionByIdAsync(productToAuction.AuctionId);
                if (auction == null || auction.Closed)
                {
                    logger.Error($"SignalRMessageHandler.HandleProductToAuctionStatusChangedRequest(); (auction == null || auction.Closed); Closed: {auction?.Closed}", null, customer);
                    return ResponseType.Error;
                }
                
                if (!IsValidRequestAuctionStatus(auctionProductStatusRequest.AuctionStatus, productToAuction.AuctionStatus))
                {
                    responseType = ResponseType.ToCaller;
                    logger.Error($"SignalRMessageHandler.HandleProductToAuctionStatusChangedRequest(); RequestAuctionStatusIsValid() == false; newStatus: {auctionProductStatusRequest.AuctionStatus}; oldStatus: {productToAuction.AuctionStatus}", null, customer);
                    //return ResponseType.Error;;
                }
                else if (auctionProductStatusRequest.AuctionStatus == AuctionStatus.None) await ResetProductToAuction(productToAuction, auction.CategoryId);
                else
                {
                    switch (auctionProductStatusRequest.AuctionStatus)
                    {
                        case AuctionStatus.Active:
                            productToAuction.AuctionStatus = AuctionStatus.Active;
                            await UpdateProductCategoryIsFeaturedAsync(productToAuction.ProductId, auction.CategoryId, true);
                            break;

                        case AuctionStatus.FirstWarning:
                        case AuctionStatus.SecondWarning:
                            productToAuction.AuctionStatus = auctionProductStatusRequest.AuctionStatus;
                            break;

                        case AuctionStatus.Sold:
                            var lastAuctionBid = await auctionService.GetLastAuctionBidByProductToAuctionIdAsync(productToAuction.Id);
                            if (lastAuctionBid == null) productToAuction.AuctionStatus = AuctionStatus.NotSold;
                            else
                            {
                                productToAuction.AuctionStatus = AuctionStatus.Sold;
                                productToAuction.CurrentPrice = lastAuctionBid.BidPrice;
                                productToAuction.WinnerCustomerId = lastAuctionBid.CustomerId;

                                var placeOrderResult = await auctionService.CreateOrderForWinnerAsync(productToAuction);
                                if (placeOrderResult == null || placeOrderResult.Id == 0)
                                {
                                    logger.Error($"SignalRMessageHandler.HandleProductToAuctionStatusChangedRequest(); (placeOrderResult == null || placeOrderResult.Id == 0)", null, customer);
                                    //return; //TODO: EGYELŐRE HAGYJUK LEZÁRNI AKKOR IS, HA NEM SIKERÜLT AZ ORDERPLACE()! - J.
                                }
                            }

                            await UpdateProductCategoryIsFeaturedAsync(productToAuction.ProductId, auction.CategoryId, false);
                            break;

                        case AuctionStatus.Pause:
                            productToAuction.AuctionStatus = AuctionStatus.Pause;
                            break;

                        default:
                            logger.Error($"SignalRMessageHandler.HandleProductToAuctionStatusChangedRequest(); AuctionStatus not found; (auctionProductStatusRequest.AuctionStatus == {auctionProductStatusRequest.AuctionStatus})", null, customer);
                            return ResponseType.Error;
                    }

                    await auctionService.UpdateProductToAuctionMappingAsync(productToAuction);
                }

                var bidsCount = productToAuction.BidsCount;//await auctionService.GetBidsCountByProductToAuctionIdAsync(productToAuction.Id);
                var productToauctionChangedNotification = new MessageWrapper
                {
                    MessageType = nameof(ProductToAuctionStatusNotification),
                    SenderId = customer.Id,
                    ResponseType = responseType,
                    Data = new ProductToAuctionStatusNotification(await auctionService.GetAuctionDtoByProductToAuctionIdAsync(productToAuction.Id, true), bidsCount, "EMPTY").ToJson()
                };

                await SendMessageToClientsAsync(productToauctionChangedNotification, responseType == ResponseType.ToCaller);

                //TODO: gond van ha az Admin valamit módosít és újrazár egy régi ProductToAuction-t!!!! AuctionRequestMode.Normal...- J.
                if (responseType== ResponseType.ToAllClients && /*AuctionRequestMode.Normal &&*/ auction.AuctionType == AuctionType.AutomaticNext && productToAuction.AuctionStatus is AuctionStatus.Sold or AuctionStatus.NotSold)
                    await StepNextProductToAuctionAsync(messageWrapper, customer, productToAuction, auctionProductStatusRequest);

                return ResponseType.ToAllClients;
            }
            catch (Exception ex)
            {
                logger.Error($"SignalRMessageHandler.HandleProductToAuctionStatusChangedRequest(); Exception: {ex.Message}", ex, customer);
            }

            return ResponseType.Error;
        }

        private async Task SendMessageToClientsAsync(MessageWrapper messageWrapper, bool sendToCaller = false)
        {
            //if (sendToCaller) await hubContext.Clients.Caller.SendAsync("send", bidMessage.ToJson());
            //else 
            await hubContext.Clients.All.SendAsync("send", messageWrapper.ToJson());
        }


        private async Task<ResponseType> HandleBidRequest(Customer customer, MessageWrapper messageWrapper)
        {
            var bidRequestMessage = messageWrapper.Data.JsonTo<AuctionBidRequest>();
            if (bidRequestMessage == null)
            {
                logger.Error($"SignalRMessageHandler.HandleBidRequest(); (bidRequestMessage == null)", null, customer);
                return ResponseType.Error;
            }

            try
            {
                await logger.InformationAsync($"SignalRMessageHandler.HandleBidRequest(); Bid received; Auction: {bidRequestMessage.AuctionId}; ProductToAuction: {bidRequestMessage.ProductAuctionMappingId}; Product: {bidRequestMessage.ProductId}; Bid: {bidRequestMessage.BidPrice}; Customer: {bidRequestMessage.CustomerId}", null, customer);

                var auction = await auctionService.GetAuctionDtoByIdAsync(bidRequestMessage.AuctionId, false, false);
                if (auction == null || auction.Closed)
                {
                    logger.Warning($"SignalRMessageHandler.HandleBidRequest(); (auction == null || auction.Closed); Closed: {auction?.Closed}", null, customer);
                    return ResponseType.Error;
                }

                var product = await auctionService.GetProductById(bidRequestMessage.ProductId);
                if (product == null) return ResponseType.Error;

                var activeProductAuction = (await auctionService.GetProductToAuctionByAuctionIdAndProductIdAsync(bidRequestMessage.AuctionId, bidRequestMessage.ProductId, true)).FirstOrDefault();
                if (activeProductAuction is not { IsActiveItem: true } || (activeProductAuction.WinnerCustomerId == customer.Id && !await customerService.IsAdminAsync(customer)))
                {
                    logger.Warning($"SignalRMessageHandler.HandleBidRequest(); (activeProductAuction is not {{ IsActiveItem: true }} || activeProductAuction.WinnerCustomerId == customer.Id && !await customerService.IsAdminAsync(customer)); AuctionStatus: {activeProductAuction?.AuctionStatus}; WinnerCustomerId: {activeProductAuction?.WinnerCustomerId}", null, customer);
                    await SendAuctionBidMessageAsync(messageWrapper, activeProductAuction, product, customer.Id);//, false);
                    return ResponseType.ToCaller;
                }

                if (!IsValidBidPrice(activeProductAuction.CurrentPrice, bidRequestMessage.BidPrice, activeProductAuction.BidsCount > 0, customer))
                {
                    await SendAuctionBidMessageAsync(messageWrapper, activeProductAuction, product, customer.Id);//, false);
                    return ResponseType.ToCaller;
                }

                var auctionBid = bidRequestMessage.CreateMainEntity();
                auctionBid.ProductAuctionMappingId = activeProductAuction.Id;
                
                await auctionService.InsertBidAsync(auctionBid);
                activeProductAuction.BidsCount++;

                activeProductAuction.AuctionStatus = AuctionStatus.Active;
                if (!await SetAuctionBidPrice(auctionBid.BidPrice, activeProductAuction, product, customer.Id)) return ResponseType.Error;
                
                await SendAuctionBidMessageAsync(messageWrapper, activeProductAuction, product, customer.Id);
                return ResponseType.ToAllClients;
            }
            catch (Exception ex)
            {
                logger.Error($"SignalRMessageHandler.HandleBidRequest(); Exception: {ex.Message}", ex, customer);
            }

            return ResponseType.Error;
        }

        private async Task<bool> SetAuctionBidPrice(decimal bidPrice, ProductToAuctionMapping productToAuction, Product product, int lastBidCustomerId)
        {
	        try
	        {
		        product.Price = bidPrice;
		        await productService.UpdateProductAsync(product);

		        //activeProductAuction.StartingPrice = product.OldPrice; //TODO: ez biztosan kezelve van mikor összerendeljük? - J.
		        productToAuction.CurrentPrice = bidPrice;
		        productToAuction.WinnerCustomerId = lastBidCustomerId;
		        await auctionService.UpdateProductToAuctionMappingAsync(productToAuction);

		        return true;
	        }
	        catch (Exception ex)
	        {
		        logger.Error($"SignalRMessageHandler.HandleBidRequest(); SetAuctionBidPrice() == false", ex);
	        }

	        return false;
        }

        private async Task SendAuctionBidMessageAsync(MessageWrapper messageWrapper, ProductToAuctionMapping productToAuction, Product product, int customerId, bool sendToCaller = false)
        {
            var bidsCount = productToAuction.BidsCount; //await auctionService.GetBidsCountByProductToAuctionIdAsync(productToAuction.Id);

            var stepAmount = GetStepAmount(productToAuction.CurrentPrice);
            var nextBidPrice = GetNextBidPrice(productToAuction.CurrentPrice, stepAmount, bidsCount > 0);

            messageWrapper.SenderId = customerId;
            messageWrapper.ResponseType = sendToCaller ? ResponseType.ToCaller : ResponseType.ToAllClients;
            messageWrapper.MessageType = "bidNotification";
            messageWrapper.Data = new BidNotificationMessage(await auctionService.GetAuctionDtoByProductToAuctionIdAsync(productToAuction.Id, true), bidsCount, "EMPTY") //TODO: NE KÉRJÜK LE DB-BŐL!!! - J.
            {
                ProductName = product.Name,
                CurrentPrice = productToAuction.CurrentPrice,
                NextStepAmount = stepAmount,
                NextBidPrice = nextBidPrice,
            }.ToJson();

            await SendMessageToClientsAsync(messageWrapper, sendToCaller);
        }

        private async Task StepNextProductToAuctionAsync(MessageWrapper messageWrapper, Customer customer, ProductToAuctionMapping productToAuction, AuctionProductStatusRequest auctionProductStatusRequest)
        {
            var nextProductToAuction = await auctionService.GetNextProductToAuctionByAuctionIdAsync(productToAuction.AuctionId);
            if (nextProductToAuction == null) return;

            await logger.InformationAsync($"SignalRMessageHandler.StepNextProductToAuctionAsync(); NextProductToAuctionId: {nextProductToAuction.Id};", null, customer);

            if (nextProductToAuction.AuctionStatus != AuctionStatus.None)
            {
                await logger.WarningAsync($"SignalRMessageHandler.StepNextProductToAuctionAsync(); (nextProductToAuction.AuctionStatus != AuctionStatus.None); NextProductToAuctionId: {nextProductToAuction.Id}; Status: {nextProductToAuction.AuctionStatus}({(int)nextProductToAuction.AuctionStatus})", null, customer);
                return; //TODO: Ilyenkor mi legyen?! - J.
            }

            auctionProductStatusRequest.AuctionStatus = AuctionStatus.Active;
            auctionProductStatusRequest.ProductToAuctionId = nextProductToAuction.Id;

            await HandleProductToAuctionStatusChangedRequest(customer, messageWrapper);
        }

        private async Task ResetProductToAuction(ProductToAuctionMapping productToAuction, int? categoryId = null)
        {
	        productToAuction.AuctionStatus = AuctionStatus.None;
	        await auctionService.ResetProductToAuctionAsync(productToAuction, productToAuction.StartingPrice);

            categoryId ??= (await auctionService.GetAuctionByIdAsync(productToAuction.AuctionId))?.CategoryId;
            await UpdateProductCategoryIsFeaturedAsync(productToAuction.ProductId, categoryId, false);
        }

        private async Task UpdateProductCategoryIsFeaturedAsync(int productId, int? categoryId, bool isFeatured)
        {
            //Leszarjuk ha elszáll, az aukció menjen tovább... - J.
            try
            {
                if (categoryId.GetValueOrDefault(0) == 0) return;

                var productCategory = (await categoryService.GetProductCategoriesByProductIdAsync(productId)).FirstOrDefault(x => x.CategoryId == categoryId);
                if (productCategory == null) return;

                if (productCategory.IsFeaturedProduct == isFeatured) return;

                productCategory.IsFeaturedProduct = isFeatured;
                await categoryService.UpdateProductCategoryAsync(productCategory);
            }
            catch (Exception ex)
            {
                logger.Error($"SignalRMessageHandler.UpdateProductCategoryIsFeaturedAsync(); categoryId: {categoryId}; productId: {productId}; isFeatured: {isFeatured}", ex);
            }
        }

        private bool IsValidBidPrice(decimal productToAuctionCurrentPrice, decimal bidRequestPrice, bool hasAuctionBidInDb, Customer customer = null)
        {
            var nextBidPrice = GetNextBidPrice(productToAuctionCurrentPrice, hasAuctionBidInDb);
            if (bidRequestPrice != nextBidPrice)
            {
                logger.Warning($"SignalRMessageHandler.IsValidBidPrice(); (bidRequestPrice != nextBidPrice); productToAuctionCurrentPrice: {productToAuctionCurrentPrice}; bidRequestPrice: {bidRequestPrice}; hasAuctionBidInDb: {hasAuctionBidInDb}", null, customer);
                return false;
            }

            return true;
        }

        private static decimal GetStepAmount(decimal currentBidPrice) => AuctionService.GetStepAmount(currentBidPrice);
        private static decimal GetNextBidPrice(decimal currentBidPrice, bool hasAuctionBidInDb) => GetNextBidPrice(currentBidPrice, GetStepAmount(currentBidPrice), hasAuctionBidInDb);
        private static decimal GetNextBidPrice(decimal currentBidPrice, decimal stepAmount, bool hasAuctionBidInDb) => AuctionService.GetNextBidPrice(currentBidPrice, stepAmount, hasAuctionBidInDb);

        private static bool IsValidRequestAuctionStatus(AuctionStatus newStatus, AuctionStatus oldStatus)
        {
            switch (oldStatus)
            {
                case AuctionStatus.None:
                    return newStatus is AuctionStatus.Active or AuctionStatus.Pause;
                case AuctionStatus.Active:
                    return newStatus is AuctionStatus.FirstWarning or AuctionStatus.Pause;
                case AuctionStatus.FirstWarning:
                    return newStatus is AuctionStatus.SecondWarning or AuctionStatus.Pause;
                case AuctionStatus.SecondWarning:
                    return newStatus is AuctionStatus.Sold or AuctionStatus.Pause;
                case AuctionStatus.Pause:
                    return newStatus is AuctionStatus.None or AuctionStatus.Active;
                case AuctionStatus.Sold:
                case AuctionStatus.NotSold:
                default:
                    return false;
            }
        }
    }
}