import { CommandHandler, ICommandHandler } from '@nestjs/cqrs';
import { ProjectRole } from '@task-stream/api/tracker/domain';
import { AttachmentStorage, attachmentKey } from '../ports/attachment-storage';
import { CommandResult, ack } from './command-result';
import { DetachFileCommand } from './detach-file.command';
import { WriteAccess } from './write-access';

/** Removes the record first; the bytes go once nothing points at them. */
@CommandHandler(DetachFileCommand)
export class DetachFileCommandHandler
  implements ICommandHandler<DetachFileCommand>
{
  constructor(
    private readonly access: WriteAccess,
    private readonly storage: AttachmentStorage,
  ) {}

  async execute(command: DetachFileCommand): Promise<CommandResult> {
    const { issue, project } = await this.access.issueForContributor(
      command.issueId,
      command.actorId,
    );
    const role = project.roleOf(command.actorId);
    issue.detach(
      command.actorId,
      command.attachmentId,
      role === ProjectRole.OWNER || role === ProjectRole.ADMIN,
    );
    await issue.commitAndWait();
    await this.storage.remove(
      attachmentKey(issue.projectId, issue.id, command.attachmentId),
    );
    return ack(issue);
  }
}