import { IQueryHandler, QueryHandler } from '@nestjs/cqrs';
import { IssueReadModel } from '@task-stream/api/tracker/domain';
import { FindIssuesRepository } from '../ports/find-issues.repository';
import { ReadAccess } from './read-access';
import { GetIssuesByIdsQuery } from './get-issues-by-ids.query';

@QueryHandler(GetIssuesByIdsQuery)
export class GetIssuesByIdsQueryHandler
  implements IQueryHandler<GetIssuesByIdsQuery, IssueReadModel[]>
{
  constructor(
    private readonly findIssues: FindIssuesRepository,
    private readonly access: ReadAccess,
  ) {}

  async execute(query: GetIssuesByIdsQuery): Promise<IssueReadModel[]> {
    const issues = await this.findIssues.findByIds([...new Set(query.ids)]);
    // Linked tickets may sit in other projects: keep the ones the viewer can read.
    const visible = new Map<string, boolean>();
    for (const projectId of new Set(issues.map((issue) => issue.projectId))) {
      visible.set(
        projectId,
        await this.access.canView(projectId, query.viewerId),
      );
    }
    return issues.filter((issue) => visible.get(issue.projectId));
  }
}