using CMSMicroservice.Domain.Enums;
using CMSMicroservice.Domain.Events;

namespace CMSMicroservice.Application.UserOrderCQ.Commands.SubmitShopBuyOrder;

public class
    SubmitShopBuyOrderCommandHandler : IRequestHandler<SubmitShopBuyOrderCommand, SubmitShopBuyOrderResponseDto>
{
    private readonly IApplicationDbContext _context;

    public SubmitShopBuyOrderCommandHandler(IApplicationDbContext context)
    {
        _context = context;
    }

    public async Task<SubmitShopBuyOrderResponseDto> Handle(SubmitShopBuyOrderCommand request,
        CancellationToken cancellationToken)
    {
        var user = await _context.Users
            .Include(i => i.UserAddresss)
            .Include(i => i.UserWallets)
            .ThenInclude(i => i.UserWalletChangeLogs)
            .Include(i => i.UserCartss)
            .ThenInclude(i => i.Product)
            .FirstOrDefaultAsync(w => w.Id == request.UserId, cancellationToken: cancellationToken);
        if (user.UserCartss.Count == 0)
            throw new NotFoundException("UserCart", request.UserId);

        if (user.UserCartss.Sum(s => s.Count * s.Product.Price) != request.TotalAmount)
            throw new Exception("مبلغ سفارش با مجموع سبد خرید مطابقت ندارد.");


        var userWallet = user.UserWallets.FirstOrDefault();
        if (userWallet == null)
            throw new Exception("کیف پول کاربر یافت نشد.");
        
        if (userWallet.Balance<=0 || userWallet.Balance<request.TotalAmount)
            throw new Exception("موجودی کیف پول کاربر برای انجام این تراکنش کافی نیست.");
        
        var newTransaction = new Transactions()
        {
            Amount = request.TotalAmount,
            Description = "خرید از فروشگاه",
            PaymentStatus = PaymentStatus.Success,
            PaymentDate = DateTime.Now,
            Type = TransactionType.Buy,
            RefId = "localwallet-" + Guid.NewGuid().ToString()
        };
        await _context.Transactionss.AddAsync(newTransaction, cancellationToken);
        await _context.SaveChangesAsync(cancellationToken);
        
        var newWalletLog = new UserWalletChangeLog()
        {
            CurrentBalance = userWallet.Balance,
            ChangeValue = -1*request.TotalAmount,
            IsIncrease = false,
            RefrenceId = newTransaction.Id
        };
        userWallet.Balance -= request.TotalAmount;
        
        await _context.UserWalletChangeLogs.AddAsync(newWalletLog, cancellationToken);
        await _context.SaveChangesAsync(cancellationToken);

        var newOrder = new UserOrder()
        {
            Amount = request.TotalAmount,
            PaymentStatus = PaymentStatus.Success,
            PaymentMethod = PaymentMethod.Wallet,
            PaymentDate = DateTime.Now,
            UserId = request.UserId,
            UserAddressId = user.UserAddresss.First(f => f.IsDefault).Id,
            TransactionId = newTransaction.Id
        };
        await _context.UserOrders.AddAsync(newOrder, cancellationToken);
        await _context.SaveChangesAsync(cancellationToken);
        var factorDetailsList = user.UserCartss.Select(s => new FactorDetails()
        {
            ProductId = s.ProductId,
            Count = s.Count,
            UnitPrice = s.Product.Price,
            OrderId = newOrder.Id
        });
        await _context.FactorDetailss.AddRangeAsync(factorDetailsList, cancellationToken);
        var finalResult = new SubmitShopBuyOrderResponseDto()
        {
            Id = newOrder.Id,
            PaymentMethod = newOrder.PaymentMethod,
            PaymentStatus = newOrder.PaymentStatus,
            TotalAmount = newOrder.Amount,
            UserAddressText = user.UserAddresss.First(f => f.IsDefault).Address,
            PaymentDate = newOrder.PaymentDate,
            FactorDetails = factorDetailsList.Select(s => new SubmitShopBuyOrderFactorDetail()
            {
                Count = s.Count,
                UnitPrice = s.UnitPrice,
                ProductId = s.ProductId,
                ProductThumbnailPath = user.UserCartss.First(f => f.ProductId == s.ProductId).Product.ThumbnailPath,
                ProductTitle =  user.UserCartss.First(f => f.ProductId == s.ProductId).Product.Title,
                UnitDiscountPrice = 0,
            }).ToList()
        };
        user.UserCartss.Clear();
        await _context.SaveChangesAsync(cancellationToken);
        return finalResult;
    }
}