// c31 — model: pure helpers for shaping a git commit out of an edit
// submission. Source-agnostic — used to live with c14_forgejo's
// commitFile, now feeds c14_git.commitFile against the local bare
// repo. Sibling-tested.

export interface CommitMessageInput {
  // Page title shown in the editor header (e.g. "S — Sorted").
  title: string;
  // GitHub login of the admin who saved the edit.
  author: string;
  // Path under repo root, e.g. "content/sama/sorted.md".
  filePath: string;
}

// One-line subject + author trailer. Intentionally short so it reads
// well in `git log --oneline` and in the Forgejo commit list.
export const buildCommitMessage = (input: CommitMessageInput): string => {
  const subject = `edit ${input.filePath} via web`;
  const trailer = `\n\nSubmitted by ${input.author} via the tdd.md self-hosted editor.`;
  return subject + trailer;
};

// GitHub-style noreply email so commits attribute to the user's
// GitHub account in tools that link by email. Mirrors the logic in
// c21_handlers_auth where we mint Forgejo identities.
export const noreplyEmail = (login: string, githubId?: number): string =>
  githubId !== undefined
    ? `${githubId}+${login}@users.noreply.github.com`
    : `${login}@users.noreply.github.com`;