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

namespace Application.Features.Admin.Payment.Toss.Log.Search;

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

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

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

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

        var counts = await query.GroupBy(c => 1).Select(c => new Response.TypeCounts
        {
            Failed = c.Count(x => x.LogType == TossLogType.Failed),
            Error = c.Count(x => x.LogType == TossLogType.Error),
            Webhook = c.Count(x => x.LogType == TossLogType.Webhook),
            Reconcile = c.Count(x => x.LogType == TossLogType.Reconcile)
        }).FirstOrDefaultAsync(ct) ?? new Response.TypeCounts();

        if (request.LogType.HasValue)
        {
            query = query.Where(c => c.LogType == request.LogType.Value);
        }

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

        var list = await query
            .OrderByDescending(c => c.ID)
            .Skip(skip)
            .Take(request.PerPage)
            .Select(c => new
            {
                c.ID,
                c.MemberID,
                MemberEmail = c.Member != null ? c.Member.Email : null,
                MemberName = c.Member != null ? c.Member.Name : null,
                c.LogType,
                c.Code,
                c.Message,
                c.PaymentKey,
                c.OrderID,
                c.CreatedAt
            })
            .ToListAsync(ct);

        var rows = list.Select((c, idx) => new Response.Row
        {
            Num = total - skip - idx,
            ID = c.ID,
            MemberID = c.MemberID,
            MemberEmail = c.MemberEmail,
            MemberName = c.MemberName,
            LogType = c.LogType,
            Code = c.Code,
            Message = c.Message,
            PaymentKey = c.PaymentKey,
            OrderID = c.OrderID,
            CreatedAt = c.CreatedAt
        }).ToList();

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