// SPDX-License-Identifier: MIT
// Part of pi-steering-commit-format.

/**
 * Tests for `extractCommitMessage`.
 *
 * The three input shapes from `extract.ts`'s JSDoc each with at least
 * one example; `git commit` (no `-m`) returns null; multi-flag command
 * (`-m foo --amend`) stops at the next flag; nested quotes
 * (`-m "feat: 'x'"`).
 */

import assert from "node:assert/strict";
import { describe, it } from "node:test";
import { extractCommitMessage } from "./extract.ts";

describe("extractCommitMessage — input shapes", () => {
  it('shape 1: double-quoted `git commit -m "feat: x"`', () => {
    assert.equal(extractCommitMessage(`git commit -m "feat: x"`), "feat: x");
  });

  it("shape 2: single-quoted `git commit -m 'feat: x'`", () => {
    assert.equal(extractCommitMessage(`git commit -m 'feat: x'`), "feat: x");
  });

  it("shape 3: tokenized `git commit -m feat: x` (quotes stripped)", () => {
    // AST-flatten case: the walker may strip quotes when emitting
    // the raw command text.
    assert.equal(extractCommitMessage(`git commit -m feat: x`), "feat: x");
  });

  it("shape 3 multi-word: `git commit -m feat: foo bar baz`", () => {
    assert.equal(
      extractCommitMessage(`git commit -m feat: foo bar baz`),
      "feat: foo bar baz",
    );
  });
});

describe("extractCommitMessage — boundary cases", () => {
  it("returns null when no -m is present", () => {
    assert.equal(extractCommitMessage(`git commit`), null);
  });

  it("returns null on plain `git status`", () => {
    assert.equal(extractCommitMessage(`git status`), null);
  });

  it("tokenized: stops at the next flag (`-m foo --amend`)", () => {
    assert.equal(
      extractCommitMessage(`git commit -m feat: x --amend`),
      "feat: x",
    );
  });

  it("tokenized: stops at the next short flag (`-m foo -n`)", () => {
    assert.equal(extractCommitMessage(`git commit -m feat: x -n`), "feat: x");
  });

  it("double-quoted with nested single quotes", () => {
    assert.equal(
      extractCommitMessage(`git commit -m "feat: 'x'"`),
      `feat: 'x'`,
    );
  });

  it("double-quoted preserves trailing content outside the quoted -m", () => {
    // The quoted shape is greedy-non-greedy on the closing `"` —
    // once the quoted span closes, anything after is ignored.
    assert.equal(
      extractCommitMessage(`git commit -m "feat: x" --signoff`),
      "feat: x",
    );
  });

  it("double-quoted handles colons / brackets inside the message", () => {
    assert.equal(
      extractCommitMessage(`git commit -m "feat: add [ABC-123] login"`),
      "feat: add [ABC-123] login",
    );
  });
});