import { Injectable } from '@nestjs/common';
import {
  IssuesService,
  ProjectsService,
  WorkflowsService,
} from '@task-stream/api/tracker/application';
import {
  IssueReadModel,
  ProjectReadModel,
} from '@task-stream/api/tracker/domain';
import { toSettingsPayload } from '../common/settings';

const UUID = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;

/**
 * REST routes accept a project or ticket by id or by key (`WEB`, `WEB-12`),
 * which is what other apps usually have. Keys are looked up in the read model;
 * ids go straight to the command (the service still checks membership).
 */
@Injectable()
export class Refs {
  constructor(
    private readonly projects: ProjectsService,
    private readonly issues: IssuesService,
    private readonly workflows: WorkflowsService,
  ) {}

  async projectId(viewerId: string | null, ref: string): Promise<string> {
    if (UUID.test(ref)) return ref;
    return (await this.projects.findOne(viewerId, ref)).id;
  }

  async issueId(viewerId: string | null, ref: string): Promise<string> {
    if (UUID.test(ref)) return ref;
    return (await this.issues.findOne(viewerId, ref)).id;
  }

  /** The ticket as the REST API returns it: read model + allowed transitions. */
  async issueDto(issue: IssueReadModel) {
    return {
      ...issue,
      allowedTransitions: await this.workflows.allowedTransitions(issue),
    };
  }

  issueDtos(issues: IssueReadModel[]) {
    return Promise.all(issues.map((issue) => this.issueDto(issue)));
  }
}

/** The project as the REST API returns it: transitions as a list. */
export function toProjectDto(project: ProjectReadModel) {
  return { ...project, settings: toSettingsPayload(project.settings) };
}