using Application.Abstractions.Data;
using SharedKernel.Extensions;
using MediatR;
using Microsoft.EntityFrameworkCore;

namespace Application.Features.Faq.Category.Get
{
    public sealed class Handler(IAppDbContext db) : IRequestHandler<Query, Response>
    {
        public async Task<Response> Handle(Query request, CancellationToken ct)
        {
            var items = await db.FaqCategory
                .AsNoTracking()
                .Include(c => c.FaqItems)
                .OrderBy(c => c.Order)
                .ThenByDescending(c => c.ID)
                .Select(c => new
                {
                    c.ID,
                    c.Code,
                    c.Subject,
                    c.Order,
                    c.IsActive,
                    FaqItemCount = c.FaqItems.Count,
                    c.UpdatedAt,
                    c.CreatedAt
                })
                .ToListAsync(ct);

            int total = items.Count;

            var rows = items.Select((c, index) => new Response.Row(
                Num: total - index,
                ID: c.ID,
                Index: index,
                Code: c.Code,
                Subject: c.Subject,
                Order: c.Order,
                IsActive: c.IsActive,
                (ushort)c.FaqItemCount,
                c.UpdatedAt.GetDateAt() ?? "-",
                c.CreatedAt.GetDateAt()
            )).ToList();

            return new Response(total, rows);
        }
    }
}