using AutoMapper;
using MediatR;
using mws.backend.dotnet.application.Common;
using mws.backend.dotnet.application.Permissions;
using mws.backend.dotnet.domain.Documents;

namespace mws.backend.dotnet.application.Documents;

public record UpdateDocumentCommand(Guid UserId, Guid DocumentId, UpdateDocumentRequest Request) : IRequest<DocumentDto>;

public class UpdateDocumentHandler(IUnitOfWork uow, IMapper mapper) : IRequestHandler<UpdateDocumentCommand, DocumentDto>
{
    public async Task<DocumentDto> Handle(UpdateDocumentCommand command, CancellationToken ct)
    {
        var doc = await DocumentAccess.GetDocumentForUserAsync(uow, command.UserId, command.DocumentId, ct);
        await DocumentAccess.EnsureDocumentPermissionAsync(uow, command.UserId, doc.ProjectId, PermissionAction.Edit, ct);

        var request = command.Request;
        if (string.IsNullOrWhiteSpace(request.Title))
        {
            throw new BadRequestException("Title is required");
        }

        doc.Title = request.Title.Trim();
        if (doc.Type == DocumentType.Document)
        {
            doc.Content = request.Content;
            doc.UpdatedAt = DateTime.UtcNow;
            doc.UpdatedBy = command.UserId;
        }
        else
        {
            doc.UpdatedAt = DateTime.UtcNow;
            doc.UpdatedBy = command.UserId;
        }

        await uow.SaveChangesAsync(ct);
        return mapper.Map<DocumentDto>(doc);
    }
}