import { EventsHandler, IEventHandler } from '@nestjs/cqrs';
import { CommentAddedEvent } from '@task-stream/api/tracker/domain';
import { FindCommentsRepository } from '../ports/find-comments.repository';
import { UpsertMaterializedCommentRepository } from '../ports/upsert-materialized-comment.repository';
import { UpsertMaterializedIssueRepository } from '../ports/upsert-materialized-issue.repository';
import { UserDirectory } from '../ports/user-directory';
import { ReadModelNotifier, versionOf } from './read-model-notifier';

@EventsHandler(CommentAddedEvent)
export class CommentAddedEventHandler
  implements IEventHandler<CommentAddedEvent>
{
  constructor(
    private readonly upsertMaterializedCommentRepository: UpsertMaterializedCommentRepository,
    private readonly upsertMaterializedIssueRepository: UpsertMaterializedIssueRepository,
    private readonly findComments: FindCommentsRepository,
    private readonly users: UserDirectory,
    private readonly notifier: ReadModelNotifier,
  ) {}

  async handle(event: CommentAddedEvent) {
    const { comment } = event;
    const users = await this.users.refs([comment.authorId]);
    await this.upsertMaterializedCommentRepository.upsert({
      id: comment.id,
      issueId: comment.issueId,
      projectId: comment.projectId,
      author: users.of(comment.authorId),
      body: comment.body,
      replyTo: comment.replyTo ?? null,
      deleted: false,
      reactions: [],
      decision: false,
      decidedBy: null,
      decidedAt: null,
      resolved: false,
      resolvedBy: null,
      resolvedAt: null,
      createdAt: comment.createdAt,
      editedAt: null,
      version: versionOf(event),
    });
    // Recount instead of incrementing, so redelivery stays idempotent.
    await this.upsertMaterializedIssueRepository.setCommentCount(
      comment.issueId,
      await this.findComments.countByIssue(comment.issueId),
    );
    await this.notifier.comment(comment.id, comment.issueId, event);
    await this.notifier.issue(comment.issueId, event);
  }
}