import { CommandHandler, ICommandHandler } from '@nestjs/cqrs';
import { Issue, Project } from '@task-stream/api/tracker/domain';
import { DropLinksToIssueCommand } from './drop-links-to-issue.command';
import { WriteAccess } from './write-access';

@CommandHandler(DropLinksToIssueCommand)
export class DropLinksToIssueCommandHandler
  implements ICommandHandler<DropLinksToIssueCommand>
{
  constructor(private readonly access: WriteAccess) {}

  async execute(command: DropLinksToIssueCommand): Promise<void> {
    const issue = await this.access.live(command.issueId, Issue);
    // Gone, or about to be (its project was deleted too): nothing to tidy.
    if (!issue || !(await this.access.live(issue.projectId, Project))) return;
    issue.unlinkAllTo(command.actorId, command.targetIssueId);
    await issue.commitAndWait();
  }
}