ANTOOZA-BACKEND/Application/Features/Api/Document/GetByCode/Handler.cs

using Application.Abstractions.Messaging;
using Application.Abstractions.Data;
using Application.Abstractions.Cache;
using Microsoft.EntityFrameworkCore;

namespace Application.Features.Api.Document.GetByCode;

public sealed class Handler(IAppDbContext db, ICacheService cache) : IQueryHandler<Query, Response?>
{
    public async Task<Response?> Handle(Query request, CancellationToken ct)
    {
        var cacheKey = CacheKeys.DocumentByCode(request.Code);
        var cached = await cache.GetAsync<Response>(cacheKey, ct);
        if (cached is not null)
        {
            return cached;
        }

        var document = await db.Document.AsNoTracking().Where(c => c.IsActive).FirstOrDefaultAsync(c => c.Code == request.Code, ct);

        if (document is null)
        {
            return null;
        }

        var response = new Response
        {
            ID = document.ID,
            Code = document.Code,
            Subject = document.Subject,
            Content = document.Content,
            IsActive = document.IsActive,
            UpdatedAt = document.UpdatedAt,
            CreatedAt = document.CreatedAt
        };

        await cache.SetAsync(cacheKey, response, ct);
        return response;
    }
}