import { assertThat } from '@task-stream/api/shared/domain';

export enum DevLinkKind {
  COMMIT = 'COMMIT',
  BRANCH = 'BRANCH',
  PULL_REQUEST = 'PULL_REQUEST',
}

export enum DevLinkState {
  OPEN = 'OPEN',
  MERGED = 'MERGED',
  CLOSED = 'CLOSED',
}

/**
 * Code that mentions a ticket: a commit, a branch or a pull/merge request,
 * as the Git host reported it. The URL identifies it.
 */
export interface DevLink {
  kind: DevLinkKind;
  url: string;
  /** Commit message's first line, branch name or PR title. */
  title: string;
  /** Short SHA, branch or PR number. */
  ref: string;
  /** Pull requests only. */
  state: DevLinkState | null;
  /** github, gitea, gitlab. */
  provider: string;
  author: string | null;
  at: string;
}

/** A ticket keeps the last this-many pieces of code. */
export const MAX_DEV_LINKS = 100;

/** Ticket keys of a project mentioned in a text (WEB-12, web-12), once each. */
export function issueKeysIn(text: string, projectKey: string): string[] {
  const pattern = new RegExp(
    `(?<![A-Za-z0-9])${projectKey}-(\\d+)(?![A-Za-z0-9])`,
    'gi',
  );
  return [
    ...new Set(
      [...text.matchAll(pattern)].map(
        (m) => `${projectKey.toUpperCase()}-${m[1]}`,
      ),
    ),
  ];
}

export function normalizeDevLink(link: DevLink): DevLink {
  assertThat(/^https?:\/\//.test(link.url), 'A dev link needs an http(s) URL');
  return {
    ...link,
    title: link.title.split('\n')[0].trim().slice(0, 200) || link.ref,
    ref: link.ref.slice(0, 120),
    author: link.author?.slice(0, 120) ?? null,
  };
}