using CMSMicroservice.Protobuf.Protos.UserWallet;
using CMSMicroservice.WebApi.Common.Services;
using CMSMicroservice.Application.UserWalletCQ.Commands.CreateNewUserWallet;
using CMSMicroservice.Application.UserWalletCQ.Commands.UpdateUserWallet;
using CMSMicroservice.Application.UserWalletCQ.Commands.DeleteUserWallet;
using CMSMicroservice.Application.WalletCQ.Commands.ChargeMagicWallet;
using CMSMicroservice.Application.WalletCQ.Commands.ChargeDiscountWallet;
using CMSMicroservice.Application.UserWalletCQ.Queries.GetUserWallet;
using CMSMicroservice.Application.UserWalletCQ.Queries.GetAllUserWalletByFilter;
using CMSMicroservice.Application.UserWalletCQ.Queries.GetCustomerWalletChangeLog;
using CMSMicroservice.Application.UserWalletCQ.Queries.GetCustomerWithdrawals;
using CMSMicroservice.Application.UserWalletCQ.Queries.GetCustomerWithdrawalSettings;
using CMSMicroservice.Application.Common.Interfaces;
using CMSMicroservice.Domain.Common;
using CMSMicroservice.Domain.Enums;
using Grpc.Core;
using Google.Protobuf.WellKnownTypes;
using Microsoft.EntityFrameworkCore;
using System.Linq;

namespace CMSMicroservice.WebApi.Services;
public class UserWalletService : UserWalletContract.UserWalletContractBase
{
    private readonly IDispatchRequestToCQRS _dispatchRequestToCQRS;
    private readonly ISender _sender;
    private readonly IApplicationDbContext _context;
    private readonly ICurrentUserService _currentUserService;

    public UserWalletService(
        IDispatchRequestToCQRS dispatchRequestToCQRS, 
        ISender sender,
        IApplicationDbContext context,
        ICurrentUserService currentUserService)
    {
        _dispatchRequestToCQRS = dispatchRequestToCQRS;
        _sender = sender;
        _context = context;
        _currentUserService = currentUserService;
    }
    public override async Task<CreateNewUserWalletResponse> CreateNewUserWallet(CreateNewUserWalletRequest request, ServerCallContext context)
    {
        return await _dispatchRequestToCQRS.Handle<CreateNewUserWalletRequest, CreateNewUserWalletCommand, CreateNewUserWalletResponse>(request, context);
    }
    public override async Task<Empty> UpdateUserWallet(UpdateUserWalletRequest request, ServerCallContext context)
    {
        return await _dispatchRequestToCQRS.Handle<UpdateUserWalletRequest, UpdateUserWalletCommand>(request, context);
    }
    public override async Task<Empty> DeleteUserWallet(DeleteUserWalletRequest request, ServerCallContext context)
    {
        return await _dispatchRequestToCQRS.Handle<DeleteUserWalletRequest, DeleteUserWalletCommand>(request, context);
    }
    public override async Task<GetUserWalletResponse> GetUserWallet(GetUserWalletRequest request, ServerCallContext context)
    {
        return await _dispatchRequestToCQRS.Handle<GetUserWalletRequest, GetUserWalletQuery, GetUserWalletResponse>(request, context);
    }
    public override async Task<GetAllUserWalletByFilterResponse> GetAllUserWalletByFilter(GetAllUserWalletByFilterRequest request, ServerCallContext context)
    {
        var response = await _dispatchRequestToCQRS.Handle<GetAllUserWalletByFilterRequest, GetAllUserWalletByFilterQuery, GetAllUserWalletByFilterResponse>(request, context);

        // Enrich response with user names
        if (response?.Models != null && response.Models.Any())
        {
            var userIds = response.Models.Select(m => m.UserId).Distinct().ToList();
            var users = await _context.Users
                .AsNoTracking()
                .Where(u => userIds.Contains(u.Id))
                .Select(u => new { u.Id, u.FirstName, u.LastName })
                .ToDictionaryAsync(u => u.Id, context.CancellationToken);

            foreach (var model in response.Models)
            {
                if (users.TryGetValue(model.UserId, out var user))
                {
                    model.UserName = $"{user.FirstName} {user.LastName}".Trim();
                }
            }
        }

        return response;
    }
    
    // ============= Customer-specific Methods =============
    
    public override async Task<GetCustomerWalletResponse> GetCustomerWallet(Google.Protobuf.WellKnownTypes.Empty request, ServerCallContext context)
    {
        // Customer endpoint: resolve userId from JWT
        if (!long.TryParse(_currentUserService.UserId, out var userId) || userId <= 0)
            throw new RpcException(new Status(StatusCode.Unauthenticated, "کاربر احراز هویت نشده است"));

        var walletQuery = new GetUserWalletQuery { Id = userId };
        var wallet = await _sender.Send(walletQuery, context.CancellationToken);
        
        var walletEntity = await _context.UserWallets
            .FirstOrDefaultAsync(w => w.UserId == userId, context.CancellationToken);

        return new GetCustomerWalletResponse
        {
            Balance = wallet.Balance,
            NetworkBalance = wallet.NetworkBalance,
            DiscountBalance = wallet.DiscountBalance,
            WalletMode = (int)(walletEntity?.WalletMode ?? WalletMode.Normal)
        };
    }
    
    public override async Task<GetCustomerWalletChangeLogResponse> GetCustomerWalletChangeLog(GetCustomerWalletChangeLogRequest request, ServerCallContext context)
    {
        var query = new GetCustomerWalletChangeLogQuery
        {
            ReferenceId = request.ReferenceId,
            IsIncrease = request.IsIncrease
        };
        
        var changeLogs = await _sender.Send(query, context.CancellationToken);
        
        var response = new GetCustomerWalletChangeLogResponse
        {
            MetaData = new CMSMicroservice.Protobuf.Protos.MetaData
            {
                CurrentPage = 1,
                TotalPage = 1,
                PageSize = changeLogs.Count,
                TotalCount = changeLogs.Count,
                HasPrevious = false,
                HasNext = false
            }
        };
        
        foreach (var log in changeLogs)
        {
            response.Models.Add(new CustomerWalletChangeLogModel
            {
                CurrentBalance = log.CurrentBalance,
                ChangeValue = log.ChangeValue,
                CurrentNetworkBalance = log.CurrentNetworkBalance,
                ChangeNerworkValue = log.ChangeNerworkValue,
                CurrentDiscountBalance = log.CurrentDiscountBalance,
                ChangeDiscountValue = log.ChangeDiscountValue,
                IsIncrease = log.IsIncrease,
                RefrenceId = log.RefrenceId,
                CreatedAt = Google.Protobuf.WellKnownTypes.Timestamp.FromDateTime(DateTime.SpecifyKind(log.Created, DateTimeKind.Utc))
            });
        }
        
        return response;
    }
    
    public override async Task<Google.Protobuf.WellKnownTypes.Empty> CustomerWithdrawBalance(CustomerWithdrawBalanceRequest request, ServerCallContext context)
    {
        var userId = GetCurrentUserId();
        
        // Find the commission payout record
        var payout = await _context.UserCommissionPayouts
            .Where(p => p.Id == request.PayoutId && p.UserId == userId && !p.IsDeleted)
            .FirstOrDefaultAsync(context.CancellationToken);
        
        if (payout == null)
            throw new RpcException(new Status(StatusCode.NotFound, "رکورد پرداخت کمیسیون یافت نشد"));
        
        // Validate status - can only withdraw if already paid to wallet
        if (payout.Status != Domain.Enums.CommissionPayoutStatus.Paid)
            throw new RpcException(new Status(StatusCode.FailedPrecondition, 
                "فقط کمیسیون‌های واریز شده به کیف پول قابل برداشت هستند"));
        
        // Update payout with withdrawal info
        payout.WithdrawalMethod = (Domain.Enums.WithdrawalMethod)request.WithdrawalMethod;
        payout.IbanNumber = request.IbanNumber;
        payout.Status = Domain.Enums.CommissionPayoutStatus.WithdrawRequested;
        
        await _context.SaveChangesAsync(context.CancellationToken);
        
        return new Google.Protobuf.WellKnownTypes.Empty();
    }
    
    // ============= Magic Wallet Methods =============

    public override async Task<InitiateMagicChargeResponse> InitiateMagicCharge(
        InitiateMagicChargeRequest request, ServerCallContext context)
    {
        var userId = GetCurrentUserId();

        var result = await _sender.Send(new ChargeMagicWalletCommand
        {
            UserId = userId,
            Amount = request.Amount
        }, context.CancellationToken);

        return new InitiateMagicChargeResponse
        {
            IsSuccess = result.IsSuccess,
            GatewayUrl = result.GatewayUrl ?? "",
            ErrorMessage = result.ErrorMessage ?? ""
        };
    }

    // ============= Discount Wallet Methods =============

    public override async Task<InitiateDiscountChargeResponse> InitiateDiscountCharge(
        InitiateDiscountChargeRequest request, ServerCallContext context)
    {
        var userId = GetCurrentUserId();

        var result = await _sender.Send(new ChargeDiscountWalletCommand
        {
            UserId = userId,
            Amount = request.Amount
        }, context.CancellationToken);

        return new InitiateDiscountChargeResponse
        {
            IsSuccess = result.IsSuccess,
            GatewayUrl = result.GatewayUrl ?? "",
            ErrorMessage = result.ErrorMessage ?? ""
        };
    }

    public override async Task<GetMagicWalletStatusResponse> GetMagicWalletStatus(
        Google.Protobuf.WellKnownTypes.Empty request, ServerCallContext context)
    {
        var userId = GetCurrentUserId();

        var wallet = await _context.UserWallets
            .FirstOrDefaultAsync(w => w.UserId == userId, context.CancellationToken);

        if (wallet == null)
            throw new RpcException(new Status(StatusCode.NotFound, "کیف پول یافت نشد"));

        var cycleCount = await _context.ClubMembershipCycles
            .CountAsync(c => c.UserId == userId, context.CancellationToken);

        var response = new GetMagicWalletStatusResponse
        {
            WalletMode = (int)wallet.WalletMode,
            MagicTotalDeposited = wallet.MagicTotalDeposited,
            MagicTotalCredited = wallet.MagicTotalCredited,
            MagicMaxDeposit = SystemConstants.MagicWalletMaxDeposit,
            MagicRemainingDeposit = Math.Max(0, SystemConstants.MagicWalletMaxDeposit - wallet.MagicTotalDeposited),
            Balance = wallet.Balance,
            PurchaseCycleCount = cycleCount
        };

        if (wallet.MagicActivatedAt.HasValue)
        {
            response.MagicActivatedAt = Timestamp.FromDateTime(
                DateTime.SpecifyKind(wallet.MagicActivatedAt.Value, DateTimeKind.Utc));
        }

        return response;
    }

    private long GetCurrentUserId()
    {
        if (long.TryParse(_currentUserService.UserId, out var userId) && userId > 0)
            return userId;
        throw new RpcException(new Status(StatusCode.Unauthenticated, "لطفاً وارد حساب کاربری خود شوید"));
    }
    
    public override async Task<GetCustomerWithdrawalsResponse> GetCustomerWithdrawals(GetCustomerWithdrawalsRequest request, ServerCallContext context)
    {
        var query = new GetCustomerWithdrawalsQuery
        {
            Status = request.Status
        };
        
        var withdrawals = await _sender.Send(query, context.CancellationToken);
        
        var response = new GetCustomerWithdrawalsResponse
        {
            MetaData = new CMSMicroservice.Protobuf.Protos.MetaData
            {
                CurrentPage = 1,
                TotalPage = 1,
                PageSize = withdrawals.Count,
                TotalCount = withdrawals.Count,
                HasPrevious = false,
                HasNext = false
            }
        };
        
        foreach (var withdrawal in withdrawals)
        {
            response.Models.Add(new CustomerWithdrawalModel
            {
                Id = withdrawal.Id,
                WeekDefinitionId = withdrawal.WeekDefinitionId,
                WeekDisplayName = withdrawal.WeekDisplayName,
                TotalAmount = withdrawal.TotalAmount,
                Status = withdrawal.Status,
                WithdrawalMethod = withdrawal.WithdrawalMethod,
                IbanNumber = withdrawal.IbanNumber,
                Created = Google.Protobuf.WellKnownTypes.Timestamp.FromDateTime(DateTime.SpecifyKind(withdrawal.Created, DateTimeKind.Utc))
            });
        }
        
        return response;
    }
    
    public override async Task<GetCustomerWithdrawalSettingsResponse> GetCustomerWithdrawalSettings(Google.Protobuf.WellKnownTypes.Empty request, ServerCallContext context)
    {
        var query = new GetCustomerWithdrawalSettingsQuery();
        var settings = await _sender.Send(query, context.CancellationToken);
        
        return new GetCustomerWithdrawalSettingsResponse
        {
            MinWithdrawalAmount = settings.MinWithdrawalAmount
        };
    }
}