using Application.Abstractions.Data;
using Application.Abstractions.Messaging;
using Domain.Entities.Payments.ValueObject;
using Microsoft.EntityFrameworkCore;

namespace Application.Features.Admin.Payment.Danal.Cancel.Search;

public sealed class Handler(IAppDbContext db) : IQueryHandler<Query, Response>
{
    public async Task<Response> Handle(Query request, CancellationToken ct)
    {
        var query = db.DanalCancel.AsNoTracking().Include(x => x.Member).AsQueryable();

        if (!string.IsNullOrWhiteSpace(request.Keyword))
        {
            query = request.Search switch
            {
                1 => query.Where(x => x.TransactionID.Contains(request.Keyword)),
                2 => query.Where(x => x.OrderID.Contains(request.Keyword)),
                3 => query.Where(x => x.Member != null && x.Member.ID.ToString().Contains(request.Keyword)),
                4 => query.Where(x => x.Member != null && x.Member.Name != null && x.Member.Name.Contains(request.Keyword)),
                5 => query.Where(x => x.Member != null && x.Member.SID.Contains(request.Keyword)),
                _ => query
            };
        }

        if (!string.IsNullOrWhiteSpace(request.StartAt) && DateTime.TryParse(request.StartAt, out var startAt))
        {
            query = query.Where(x => x.CreatedAt >= startAt);
        }

        if (!string.IsNullOrWhiteSpace(request.EndAt) && DateTime.TryParse(request.EndAt, out var endAt))
        {
            query = query.Where(x => x.CreatedAt <= endAt);
        }

        var counts = await query.GroupBy(c => 1).Select(c => new Response.MethodCounts
        {
            Card = c.Count(x => x.Method == PaymentMethod.Card),
            VirtualAccount = c.Count(x => x.Method == PaymentMethod.VirtualAccount),
            Mobile = c.Count(x => x.Method == PaymentMethod.Mobile),
            Transfer = c.Count(x => x.Method == PaymentMethod.Transfer)
        }).FirstOrDefaultAsync(ct) ?? new Response.MethodCounts();

        if (request.PayMethod.HasValue)
        {
            query = query.Where(x => x.Method == request.PayMethod.Value);
        }

        var total = await query.CountAsync(ct);
        var skip = (request.Page - 1) * request.PerPage;

        var list = await query
            .OrderByDescending(x => x.ID)
            .Skip(skip)
            .Take(request.PerPage)
            .Select(x => new Response.Row
            {
                Num = 0,
                ID = x.ID,
                MemberID = x.MemberID,
                MemberEmail = x.Member != null ? x.Member.Email : string.Empty,
                MemberName = x.Member != null ? x.Member.Name : null,
                Method = x.Method,
                CancelType = x.CancelType,
                TransactionID = x.TransactionID,
                OrderID = x.OrderID,
                Amount = x.Amount,
                Balance = x.Balance,
                ResponseCode = x.ResponseCode,
                ResponseMessage = x.ResponseMessage,
                CreatedAt = x.CreatedAt
            })
            .ToListAsync(ct);

        var rows = list.Select((x, idx) => new Response.Row
        {
            Num = total - skip - idx,
            ID = x.ID,
            MemberID = x.MemberID,
            MemberEmail = x.MemberEmail,
            MemberName = x.MemberName,
            Method = x.Method,
            CancelType = x.CancelType,
            TransactionID = x.TransactionID,
            OrderID = x.OrderID,
            Amount = x.Amount,
            Balance = x.Balance,
            ResponseCode = x.ResponseCode,
            ResponseMessage = x.ResponseMessage,
            CreatedAt = x.CreatedAt
        }).ToList();

        return new Response
        {
            Total = total,
            Counts = counts,
            List = rows
        };
    }
}