import { NotFoundError } from '@task-stream/api/shared/domain';
import { FindIssuesRepository } from '../ports/find-issues.repository';
import { IQueryHandler, QueryHandler } from '@nestjs/cqrs';
import { ActivityReadModel } from '@task-stream/api/tracker/domain';
import { FindActivityRepository } from '../ports/find-activity.repository';
import { ReadAccess } from './read-access';
import { GetActivityQuery } from './get-activity.query';

@QueryHandler(GetActivityQuery)
export class GetActivityQueryHandler
  implements IQueryHandler<GetActivityQuery, ActivityReadModel[]>
{
  constructor(
    private readonly findActivity: FindActivityRepository,
    private readonly access: ReadAccess,
    private readonly findIssues: FindIssuesRepository,
  ) {}

  async execute(query: GetActivityQuery): Promise<ActivityReadModel[]> {
    // A ticket's history goes with the ticket; the project's feed is for
    // whoever sees the whole project (not a guest).
    if (query.issueId) {
      const issue = this.access.assertFound(
        await this.findIssues.findById(query.issueId),
        'Issue',
        query.issueId,
      );
      if (issue.projectId !== query.projectId)
        throw new NotFoundError('Issue', query.issueId);
      await this.access.assertCanViewIssue(issue, query.viewerId);
    } else
      await this.access.assertSeesWholeProject(query.projectId, query.viewerId);
    return this.findActivity.find({
      projectId: query.projectId,
      issueId: query.issueId,
      limit: Math.min(query.limit, 200),
      before: query.before,
      after: query.after,
    });
  }
}