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

namespace Application.Features.Admin.Document.Update;

public sealed class Handler(IAppDbContext db, IEditorImageService editorImage, ICacheService cache) : ICommandHandler<Command, Result>
{
    public async Task<Result> Handle(Command request, CancellationToken ct)
    {
        var document = await db.Document.FirstOrDefaultAsync(c => c.ID == request.ID, ct);
        if (document is null)
        {
            return Result.Failure(Error.NotFound("Document.NotFound", "문서를 찾을 수 없습니다."));
        }

        if (await db.Document.AnyAsync(c => c.Code == request.Code && c.ID != request.ID))
        {
            return Result.Failure(Error.Conflict("Document.DuplicateCode", "이미 등록된 문서입니다."));
        }

        var path = new FileStoragePath(UploadTarget.Editor, UploadFolder.Document, request.ID);

        document.Update(
            request.Code,
            request.Subject,
            await editorImage.UploadAsync(request.Content, path, ct),
            request.IsActive
        );

        int affectedRows = await db.SaveChangesAsync();
        if (affectedRows <= 0)
        {
            return Result.Failure(Error.Problem("Document.UpdateFailed", "문서 수정 중 오류가 발생했습니다."));
        }

        await cache.RemoveByPrefixAsync("document:", ct);

        return Result.Success();
    }
}