import { CommandHandler, ICommandHandler } from '@nestjs/cqrs';
import {
  BusinessRuleError,
  ForbiddenError,
} from '@task-stream/api/shared/domain';
import { CommandResult, ack } from './command-result';
import { VoteIssueCommand } from './vote-issue.command';
import { WriteAccess } from './write-access';

/**
 * Anyone signed in votes on a public project's tickets (that is the point:
 * the people it is for say what they want); on a private one, its members.
 */
@CommandHandler(VoteIssueCommand)
export class VoteIssueCommandHandler
  implements ICommandHandler<VoteIssueCommand>
{
  constructor(private readonly access: WriteAccess) {}

  async execute(command: VoteIssueCommand): Promise<CommandResult> {
    const issue = await this.access.issue(command.issueId);
    const project = await this.access.project(issue.projectId);
    if (!project.isPublic && !project.isMember(command.actorId))
      throw new ForbiddenError(
        `You are not a member of project ${project.key}`,
      );
    project.assertNotArchived();
    this.access.assertSees(project, issue, command.actorId);
    if (issue.trashedAt)
      throw new BusinessRuleError(`${issue.key} is in the trash`);
    issue.vote(command.actorId, command.on);
    await issue.commitAndWait();
    return ack(issue);
  }
}