bitforum-backend/Application/Features/Api/Forum/Post/Update/Handler.cs

using Application.Abstractions.Messaging;
using Application.Abstractions.Data;
using Microsoft.EntityFrameworkCore;
using SharedKernel.Results;

namespace Application.Features.Api.Forum.Post.Update;

public sealed class Handler(IAppDbContext db) : ICommandHandler<Command, Result>
{
    public async Task<Result> Handle(Command request, CancellationToken ct)
    {
        if (string.IsNullOrWhiteSpace(request.Subject))
        {
            return Result.Failure(Error.Problem("Post.SubjectRequired", "제목을 입력해주세요."));
        }

        var post = await db.Post.FirstOrDefaultAsync(x => x.ID == request.ID, ct);
        if (post is null)
        {
            return Result.Failure(Error.NotFound("Post.NotFound", "게시글을 찾을 수 없습니다."));
        }

        if (post.MemberID != request.MemberID)
        {
            return Result.Failure(Error.Forbidden("Post.Forbidden", "수정 권한이 없습니다."));
        }

        post.BoardPrefixID = request.BoardPrefixID;
        post.Subject = request.Subject.Trim();
        post.Content = request.Content ?? string.Empty;
        post.IsSecret = request.IsSecret;
        post.UpdatedAt = DateTime.UtcNow;

        await db.SaveChangesAsync(ct);

        return Result.Success();
    }
}