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

@QueryHandler(SearchIssuesQuery)
export class SearchIssuesQueryHandler
  implements IQueryHandler<SearchIssuesQuery, Page<IssueReadModel>>
{
  constructor(
    private readonly findIssues: FindIssuesRepository,
    private readonly access: ReadAccess,
  ) {}

  async execute(query: SearchIssuesQuery): Promise<Page<IssueReadModel>> {
    await this.access.assertCanView(query.filter.projectId, query.viewerId);
    const { watching, ...filter } = query.filter;
    // Someone anonymous follows nothing.
    if (watching && !query.viewerId) return { items: [], total: 0 };
    return this.findIssues.search({
      ...filter,
      participantId:
        (await this.access.participantScope(
          query.filter.projectId,
          query.viewerId,
        )) ?? undefined,
      watcherId: watching ? (query.viewerId ?? undefined) : undefined,
      limit: Math.min(query.filter.limit, 200),
    });
  }
}