'use strict';
process.env.MSD_TEST_MODE = '1';

const { test, describe } = require('node:test');
const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');

const { serializeChangelog, parseChangelog } = require(path.join(__dirname, '..', 'scripts', 'changeset', 'serialize.cjs'));

// Round-trip property: serialize(IR) → parse(text) → IR equals original.
// Tests assert on the parsed IR shape, not the serialized text contents.

describe('changeset serialize: IR → markdown round-trip (#2975)', () => {
  test('a single-section IR round-trips through serialize → parse', () => {
    const ir = {
      releaseHeader: { version: '1.0.0', date: '2026-01-01' },
      sections: [
        { type: 'Fixed', bullets: [{ pr: 1, body: 'fix something.' }] },
      ],
      priorChangelog: null,
    };
    const text = serializeChangelog(ir);
    const back = parseChangelog(text);

    assert.equal(back.releases[0].version, '1.0.0');
    assert.equal(back.releases[0].date, '2026-01-01');
    assert.equal(back.releases[0].sections.length, 1);
    assert.equal(back.releases[0].sections[0].type, 'Fixed');
    assert.equal(back.releases[0].sections[0].bullets.length, 1);
    assert.equal(back.releases[0].sections[0].bullets[0].pr, 1);
  });
});

describe('changeset serialize: multi-line bullet parsing (#3496)', () => {
  // Regression: parseChangelog silently dropped bullets whose text wrapped
  // across multiple indented continuation lines. The PR number (#NNNN) appears
  // on the final continuation line, not the opening `-` line, so the
  // single-line bullet regex never matched. Every such bullet returned 0
  // entries for its section even though the markdown was well-formed.
  test('parses a multi-line bullet whose (# pr) trailer is on a continuation line', () => {
    const text = [
      '## [1.41.0] - 2026-05-07',
      '',
      '### Feature',
      '',
      '- **Short title** — first line of a long description',
      '  that wraps onto a second line and terminates with. (#2792)',
      '- Single-line bullet with pr. (#2800)',
    ].join('\n');
    const result = parseChangelog(text);
    assert.equal(result.releases.length, 1);
    const section = result.releases[0].sections[0];
    assert.equal(section.type, 'Feature');
    assert.equal(section.bullets.length, 2, 'both bullets (multi-line and single-line) must be captured');
    assert.equal(section.bullets[0].pr, 2792, 'multi-line bullet pr');
    assert.equal(section.bullets[1].pr, 2800, 'single-line bullet pr');
  });

  test('parses a bullet with (# pr) on the opening line even when followed by multi-line bullets', () => {
    const text = [
      '## [1.42.1] - 2026-05-15',
      '',
      '### Fixed',
      '',
      '- Simple fix. (#3261)',
      '- **Complex fix** — first line of',
      '  a multi-line description. (#3287)',
    ].join('\n');
    const result = parseChangelog(text);
    const section = result.releases[0].sections[0];
    assert.equal(section.bullets.length, 2);
    assert.equal(section.bullets[0].pr, 3261);
    assert.equal(section.bullets[1].pr, 3287);
  });

  test('a multi-line bullet with linked release header is parsed correctly', () => {
    const text = [
      '## [1.42.1](https://github.com/open-gsd/gsd-core/compare/v1.41.0...v1.42.1) - 2026-05-15',
      '',
      '### Fixed',
      '',
      '- **Multi-line with linked header** — description spans',
      '  multiple lines and version header has an inline URL. (#3287)',
    ].join('\n');
    const result = parseChangelog(text);
    assert.equal(result.releases[0].version, '1.42.1');
    assert.equal(result.releases[0].sections[0].bullets.length, 1);
    assert.equal(result.releases[0].sections[0].bullets[0].pr, 3287);
  });

  test('preserves bullets without (# pr) trailer as { body, pr: null } instead of dropping them', () => {
    // Regression guard for Codex finding: bullets that lack a trailing
    // (# NNNN) were silently discarded.  They must be stored with pr: null
    // so callers (e.g. cmdExtract) can render them without silent loss.
    const text = [
      '## [1.43.0] - 2026-05-20',
      '',
      '### Fixed',
      '',
      '- Fix with a PR reference. (#4000)',
      '- Documented fix without a PR reference.',
      '- **Multi-line fix without trailer** — first line of description',
      '  that continues on a second line but has no (# NNN) at the end.',
    ].join('\n');
    const result = parseChangelog(text);
    const section = result.releases[0].sections[0];
    assert.equal(section.bullets.length, 3, 'all three bullets must be captured');
    assert.equal(section.bullets[0].pr, 4000, 'PR bullet preserved');
    assert.equal(section.bullets[1].pr, null, 'no-PR bullet has pr: null');
    assert.ok(section.bullets[1].body.includes('Documented fix'), 'no-PR bullet body preserved');
    assert.equal(section.bullets[2].pr, null, 'multi-line no-PR bullet has pr: null');
    assert.ok(section.bullets[2].body.includes('Multi-line fix without trailer'), 'multi-line no-PR body preserved');
  });
});

describe('changeset serialize: multi-section + prior content (#2975)', () => {
  const { serializeChangelog, parseChangelog } = require(require('node:path').join(__dirname, '..', 'scripts', 'changeset', 'serialize.cjs'));

  test('round-trips an IR with three section types and multiple bullets per section', () => {
    const ir = {
      releaseHeader: { version: '1.42.0', date: '2026-05-01' },
      sections: [
        { type: 'Added', bullets: [{ pr: 1, body: 'add A' }, { pr: 2, body: 'add B' }] },
        { type: 'Changed', bullets: [{ pr: 3, body: 'change C' }] },
        { type: 'Fixed', bullets: [{ pr: 4, body: 'fix D' }, { pr: 5, body: 'fix E' }] },
      ],
      priorChangelog: null,
    };
    const back = parseChangelog(serializeChangelog(ir));
    assert.equal(back.releases.length, 1);
    assert.deepEqual(
      back.releases[0].sections.map((s) => ({ type: s.type, prs: s.bullets.map((b) => b.pr) })),
      [
        { type: 'Added', prs: [1, 2] },
        { type: 'Changed', prs: [3] },
        { type: 'Fixed', prs: [4, 5] },
      ],
    );
  });

  test('prior CHANGELOG content survives serialize → parse as a separate release block', () => {
    const priorText = '## [0.9.0] - 2025-12-01\n\n### Fixed\n\n- old fix (#100)\n';
    const ir = {
      releaseHeader: { version: '1.0.0', date: '2026-01-01' },
      sections: [{ type: 'Added', bullets: [{ pr: 200, body: 'new feature' }] }],
      priorChangelog: priorText,
    };
    const back = parseChangelog(serializeChangelog(ir));
    assert.equal(back.releases.length, 2);
    assert.equal(back.releases[0].version, '1.0.0');
    assert.equal(back.releases[1].version, '0.9.0');
    assert.equal(back.releases[1].sections[0].bullets[0].pr, 100);
  });
});

// ─── #3001: multi-paragraph body round-trip ────────────────────────────────

describe('#3001: multi-paragraph changeset body round-trips without truncation', () => {
  test('a body containing \\n\\n retains content from both paragraphs AND its PR number', () => {
    const ir = {
      releaseHeader: { version: '1.42.0', date: '2026-08-05' },
      sections: [{
        type: 'Fixed',
        bullets: [{
          pr: 2595,
          body: 'First paragraph, load-bearing.\n\nSecond paragraph, also load-bearing.',
        }],
      }],
      priorChangelog: null,
    };
    const text = serializeChangelog(ir);
    const back = parseChangelog(text);
    const bullet = back.releases[0].sections[0].bullets[0];
    // PR trailer must survive (was lost pre-fix because the trailer was on the dropped side).
    assert.equal(bullet.pr, 2595,
      `PR number must survive round-trip; got: ${bullet.pr}`);
    // Content from BOTH paragraphs must be present (was truncated pre-fix).
    assert.ok(bullet.body.includes('First paragraph'),
      `first paragraph must survive; got: ${JSON.stringify(bullet.body)}`);
    assert.ok(bullet.body.includes('Second paragraph'),
      `second paragraph must survive; got: ${JSON.stringify(bullet.body)}`);
  });
});

describe('changeset serialize: shipped CHANGELOG citation integrity (#2359)', () => {
  // Regression: the `## [1.4.0]` Cursor commands-surface entry carried the
  // trailing reference (#803) — the *Cline* PR, cited correctly by the entry two
  // lines below it. The Cursor surface actually shipped in #805. Two adjacent
  // bullets therefore claimed one PR, and only the second was right.
  //
  // This is not cosmetic: the trailing (#NNNN) is machine-parsed here and
  // consumed by `cmdExtract`, so a wrong number propagates into extracted
  // release-note ranges. It had already propagated to a human reporter (#2341,
  // quoted there as "#785 / #803").
  //
  // The obvious bad fix is a global s/(#803)/(#805)/, which repairs the Cursor
  // entry and silently corrupts the Cline one. The Cline assertion below is the
  // guard for exactly that, and is expected to pass both before and after.
  const CHANGELOG = fs.readFileSync(path.join(__dirname, '..', 'CHANGELOG.md'), 'utf8');
  const CURSOR_MARKER = /`\.cursor\/commands\/gsd-<name>\.md`/; // CHANGELOG.md is unswept history
  const CLINE_MARKER = /Elevate the Cline runtime to hook parity/;

  function bulletsOf(version) {
    const release = parseChangelog(CHANGELOG).releases.find((r) => r.version === version);
    assert.ok(release, `CHANGELOG.md must still carry a \`## [${version}]\` release section`);
    return release.sections.flatMap((s) => s.bullets);
  }

  // Asserts cardinality before returning, so a reworded or deleted entry fails
  // with a readable message instead of a TypeError on an undefined bullet.
  function locateBullet(version, marker, label) {
    const matches = bulletsOf(version).filter((b) => marker.test(b.body));
    assert.equal(matches.length, 1,
      `expected exactly one ${label} bullet in the ${version} section, found ${matches.length}`);
    return matches[0];
  }

  test('the 1.4.0 Cursor commands-surface bullet cites PR 805', () => {
    const cursor = locateBullet('1.4.0', CURSOR_MARKER, 'Cursor commands-surface');
    assert.equal(cursor.pr, 805,
      'the .cursor/commands/ surface shipped in PR #805 (feat(#785)), not #803 (the Cline PR)');
  });

  test('the adjacent 1.4.0 Cline bullet still cites PR 803', () => {
    const cline = locateBullet('1.4.0', CLINE_MARKER, 'Cline hook-parity');
    assert.equal(cline.pr, 803,
      "the Cline entry's #803 is correct and must survive the Cursor correction");
  });

  test('both 1.4.0 entries survive the correction exactly once each', () => {
    const bullets = bulletsOf('1.4.0');
    assert.equal(bullets.filter((b) => CURSOR_MARKER.test(b.body)).length, 1,
      'the Cursor entry must be corrected in place — neither dropped nor duplicated');
    assert.equal(bullets.filter((b) => CLINE_MARKER.test(b.body)).length, 1,
      'the Cline entry must be left alone — neither dropped nor duplicated');
  });

  test('the adjacent Cursor and Cline bullets do not cite the same PR', () => {
    const cursor = locateBullet('1.4.0', CURSOR_MARKER, 'Cursor commands-surface');
    const cline = locateBullet('1.4.0', CLINE_MARKER, 'Cline hook-parity');
    assert.notEqual(cursor.pr, cline.pr,
      'two adjacent entries describing different runtimes cannot share one PR');
  });
});