'use strict';

/**
 * #3262 — milestone-scope guard regression tests.
 *
 * The in-place phase editor (edit-phase workflow) and the phase-creation
 * entry templates (phase add / add-batch / insert) can splice free text into
 * ROADMAP.md that carries a level 1-3 heading with a milestone marker. Such a
 * heading terminates the current milestone window (computeMilestoneSectionEnd)
 * and silently drops phases from the derived milestone phase set. These tests
 * pin the two mechanical guards this fix adds:
 *
 *  1. `roadmap milestone-scope` — read-only probe emitting the current
 *     milestone window identity (scope + declared phase ids) so the edit-phase
 *     workflow can capture/compare around its write.
 *  2. phase add / add-batch / insert reject a description containing a
 *     milestone-scoping heading line before any write or directory creation.
 *
 * Behavioral only — every case drives the msd-tools CLI seam.
 */

const { test, describe } = require('node:test');
const assert = require('node:assert/strict');
const fs = require('fs');
const path = require('path');
const { runMsdTools, createTempProject, cleanup } = require('./helpers.cjs');

const VERSIONED_ROADMAP = [
  '# Roadmap',
  '',
  '## v1.0 — Foundation',
  '',
  '### Phase 1: Setup',
  '',
  '**Goal:** bootstrap',
  '',
  '### Phase 2: API',
  '',
  '**Goal:** api',
  '',
  '### Phase 3: UI',
  '',
  '**Goal:** ui',
  '',
  '## v2.0 — Next',
  '',
  '### Phase 4: Extras',
  '',
  '**Goal:** extras',
  '',
].join('\n');

// The insidious shape: a stray milestone-bearing heading INSIDE the current
// milestone terminates the window early. The window still contains phase
// entries, so scope reads "complete" — the drop is silent, which is exactly
// why the guard must compare the phase SET, not just the scope value.
const NARROWED_ROADMAP = [
  '# Roadmap',
  '',
  '## v1.0 — Foundation',
  '',
  '### Phase 1: Setup',
  '',
  '**Goal:** bootstrap',
  '',
  '### Phase 2: API',
  '',
  '**Goal:** api',
  '',
  '## v2.1 Stretch — 🚧',
  '',
  '### Phase 3: UI',
  '',
  '**Goal:** ui',
  '',
  '## v2.0 — Next',
  '',
  '### Phase 4: Extras',
  '',
  '**Goal:** extras',
  '',
].join('\n');

const FREEFORM_ROADMAP = [
  '# Roadmap',
  '',
  '### Phase 1: Foundation',
  '',
  '**Goal:** bootstrap',
  '',
  '### Phase 2: Polish',
  '',
  '**Goal:** polish',
  '',
].join('\n');

function writeRoadmap(tmpDir, content) {
  fs.writeFileSync(path.join(tmpDir, '.planning', 'ROADMAP.md'), content);
}

function writeStateMilestone(tmpDir, version) {
  fs.writeFileSync(path.join(tmpDir, '.planning', 'STATE.md'), `# State\n\nmilestone: ${version}\n`);
}

function readRoadmap(tmpDir) {
  return fs.readFileSync(path.join(tmpDir, '.planning', 'ROADMAP.md'), 'utf-8');
}

function listPhaseDirs(tmpDir) {
  return fs.readdirSync(path.join(tmpDir, '.planning', 'phases'));
}

function runMilestoneScope(tmpDir) {
  const res = runMsdTools(['roadmap', 'milestone-scope'], tmpDir);
  assert.equal(res.success, true, `roadmap milestone-scope should exit 0, got: ${res.error || res.output}`);
  return JSON.parse(res.output);
}

// ─── roadmap milestone-scope probe ────────────────────────────────────────────

describe('#3262 roadmap milestone-scope probe', () => {
  test('reports the current milestone window phase set (later milestones excluded)', () => {
    const tmp = createTempProject('msd-3262-scope-');
    try {
      writeStateMilestone(tmp, 'v1.0');
      writeRoadmap(tmp, VERSIONED_ROADMAP);
      const result = runMilestoneScope(tmp);
      assert.equal(result.scope, 'complete');
      assert.deepEqual(result.phases, ['1', '2', '3']);
      assert.equal(result.phase_count, 3);
    } finally {
      cleanup(tmp);
    }
  });

  test('a stray milestone heading inside the window silently narrows the phase set — the signal this probe exists to expose', () => {
    const tmp = createTempProject('msd-3262-scope-');
    try {
      writeStateMilestone(tmp, 'v1.0');
      writeRoadmap(tmp, NARROWED_ROADMAP);
      const result = runMilestoneScope(tmp);
      // Phase 3 sits after the stray `## v2.1 Stretch — 🚧` terminator: it is
      // out of the window. Scope stays "complete" (the window still reaches
      // phase entries), so ONLY the phase set reveals the drop.
      assert.deepEqual(result.phases, ['1', '2']);
    } finally {
      cleanup(tmp);
    }
  });

  test('free-form roadmap (no versioned milestones) reports the whole-document phase set', () => {
    const tmp = createTempProject('msd-3262-scope-');
    try {
      writeRoadmap(tmp, FREEFORM_ROADMAP);
      const result = runMilestoneScope(tmp);
      assert.equal(result.scope, 'complete');
      assert.deepEqual(result.phases, ['1', '2']);
    } finally {
      cleanup(tmp);
    }
  });

  test('missing ROADMAP.md is a decodable unreadable result, not a crash', () => {
    const tmp = createTempProject('msd-3262-scope-');
    try {
      const res = runMsdTools(['roadmap', 'milestone-scope'], tmp);
      assert.equal(res.success, true);
      const parsed = JSON.parse(res.output);
      assert.equal(parsed.scope, 'unreadable');
      assert.deepEqual(parsed.phases, []);
      assert.ok(parsed.error, 'should carry an error field naming the missing roadmap');
    } finally {
      cleanup(tmp);
    }
  });
});

// ─── phase add / add-batch / insert description guard ────────────────────────

describe('#3262 phase add milestone-scope heading guard', () => {
  test('rejects a description embedding a versioned milestone heading; ROADMAP and phase dirs untouched', () => {
    const tmp = createTempProject('msd-3262-add-');
    try {
      writeRoadmap(tmp, FREEFORM_ROADMAP);
      const before = readRoadmap(tmp);
      const dirsBefore = listPhaseDirs(tmp);
      const res = runMsdTools(['phase', 'add', 'Extra work\n## v2.1 Evil — 🚧\nmore text'], tmp);
      assert.equal(res.success, false, 'phase add must reject an embedded milestone heading');
      assert.match(res.error || res.output, /v2\.1 Evil/, 'error must name the offending line');
      assert.equal(readRoadmap(tmp), before, 'ROADMAP.md must be byte-unchanged');
      assert.deepEqual(listPhaseDirs(tmp), dirsBefore, 'no phase directory may be created');
    } finally {
      cleanup(tmp);
    }
  });

  test('rejects a description embedding a "Milestone" word heading', () => {
    const tmp = createTempProject('msd-3262-add-');
    try {
      writeRoadmap(tmp, FREEFORM_ROADMAP);
      const before = readRoadmap(tmp);
      const res = runMsdTools(['phase', 'add', 'Retro\n# Milestone Two\nnotes'], tmp);
      assert.equal(res.success, false);
      assert.equal(readRoadmap(tmp), before);
    } finally {
      cleanup(tmp);
    }
  });

  test('ordinary single-line description still succeeds (no false rejection)', () => {
    const tmp = createTempProject('msd-3262-add-');
    try {
      writeRoadmap(tmp, FREEFORM_ROADMAP);
      const res = runMsdTools(['phase', 'add', 'Authentication and sessions'], tmp);
      assert.equal(res.success, true, `ordinary add must keep working: ${res.error || ''}`);
      assert.match(readRoadmap(tmp), /### Phase 3: Authentication and sessions/);
    } finally {
      cleanup(tmp);
    }
  });

  test('a milestone heading inside a fenced code block in the description is not a violation (parser is fence-aware)', () => {
    const tmp = createTempProject('msd-3262-add-');
    try {
      writeRoadmap(tmp, FREEFORM_ROADMAP);
      const desc = 'Document auth\n\n```\n## v2.0 example heading\n```\n';
      const res = runMsdTools(['phase', 'add', desc], tmp);
      assert.equal(res.success, true, `fenced example must not trip the guard: ${res.error || ''}`);
    } finally {
      cleanup(tmp);
    }
  });

  test('level-4+ headings and Phase-prefixed headings in a description are not violations', () => {
    const tmp = createTempProject('msd-3262-add-');
    try {
      writeRoadmap(tmp, FREEFORM_ROADMAP);
      const desc = 'Notes\n#### Sub-notes heading\n### Phase 9: decoy reference';
      const res = runMsdTools(['phase', 'add', desc], tmp);
      assert.equal(res.success, true, `level-4/Phase-prefixed headings must not trip the guard: ${res.error || ''}`);
    } finally {
      cleanup(tmp);
    }
  });
});

describe('#3262 phase insert milestone-scope heading guard', () => {
  test('rejects a description embedding a closed-marker milestone heading; ROADMAP untouched', () => {
    const tmp = createTempProject('msd-3262-insert-');
    try {
      writeRoadmap(tmp, FREEFORM_ROADMAP);
      const before = readRoadmap(tmp);
      const res = runMsdTools(['phase', 'insert', '1', 'Sneaky\n## ✅ v3.0 Done\nnotes'], tmp);
      assert.equal(res.success, false, 'phase insert must reject an embedded milestone heading');
      assert.equal(readRoadmap(tmp), before, 'ROADMAP.md must be byte-unchanged');
    } finally {
      cleanup(tmp);
    }
  });

  test('ordinary insert description still succeeds (no false rejection)', () => {
    const tmp = createTempProject('msd-3262-insert-');
    try {
      writeRoadmap(tmp, FREEFORM_ROADMAP);
      const res = runMsdTools(['phase', 'insert', '1', 'Decimal sub-phase'], tmp);
      assert.equal(res.success, true, `ordinary insert must keep working: ${res.error || ''}`);
    } finally {
      cleanup(tmp);
    }
  });
});

describe('#3262 phase add-batch milestone-scope heading guard', () => {
  test('rejects the batch when any description embeds a milestone heading; ROADMAP untouched', () => {
    const tmp = createTempProject('msd-3262-batch-');
    try {
      writeRoadmap(tmp, FREEFORM_ROADMAP);
      const before = readRoadmap(tmp);
      const descriptions = JSON.stringify(['Good phase', 'Bad\n## v2.1 Evil — 🚧']);
      const res = runMsdTools(['phase', 'add-batch', '--descriptions', descriptions], tmp);
      assert.equal(res.success, false, 'add-batch must reject an embedded milestone heading');
      assert.equal(readRoadmap(tmp), before, 'ROADMAP.md must be byte-unchanged (all-or-nothing)');
    } finally {
      cleanup(tmp);
    }
  });
});

// ─── #612 / #2761: the bracket-convention arm of the same guard ──────────────

/**
 * The #3262 guard is defined as a MIRROR of the parser's terminator vocabulary.
 * On a bracket-convention repo this branch teaches `computeMilestoneSectionEnd`'s
 * bracket extension a terminator the legacy vocabulary has no word for: the
 * ADR-canonical `## [MSD.09] Hidden` carries no vN.N token, no ✅/📋/🚧/🔄
 * marker, and not the word "Milestone". Unmirrored, the guard accepted exactly
 * the description that narrows the window — measured at this CLI seam: two
 * `phase add` calls, the second phase present in ROADMAP.md and absent from
 * `roadmap milestone-scope`'s phase set.
 *
 * Every case below has a NON-bracket control, because the whole contract is
 * that a project which has not opted in behaves byte-identically to base.
 */

const BRACKET_ROADMAP = [
  '# Roadmap',
  '',
  '## [MSD.02] Foundation',
  '',
  '### [MSD.02] 01: One',
  '',
  '**Goal:** one',
  '',
].join('\n');

function writeBracketProject(tmpDir) {
  fs.writeFileSync(
    path.join(tmpDir, '.planning', 'config.json'),
    JSON.stringify({ project_code: 'MSD', phase_id_convention: 'bracket' }, null, 2)
  );
  writeStateMilestone(tmpDir, 'v2.0');
  writeRoadmap(tmpDir, BRACKET_ROADMAP);
}

function writeLegacyTwinProject(tmpDir) {
  fs.writeFileSync(
    path.join(tmpDir, '.planning', 'config.json'),
    JSON.stringify({ project_code: 'MSD' }, null, 2)
  );
  writeStateMilestone(tmpDir, 'v2.0');
  writeRoadmap(tmpDir, BRACKET_ROADMAP);
}

describe('#2761 milestone-scope guard — bracket convention arm (#612)', () => {
  test('roadmap milestone-scope reports the bracket window phase set instead of an empty one', () => {
    const tmp = createTempProject('msd-2761-scope-');
    try {
      writeBracketProject(tmp);
      writeRoadmap(tmp, [
        BRACKET_ROADMAP,
        '### [MSD.02] 02: Two',
        '',
        '**Goal:** two',
        '',
        '## [MSD.03] Later',
        '',
        '### [MSD.03] 01: Later one',
        '',
        '**Goal:** later',
        '',
      ].join('\n'));
      const result = runMilestoneScope(tmp);
      // Blind, this probe returns [] on a bracket ROADMAP — before AND after any
      // write — so the workflow's equality check can never fail.
      assert.deepEqual(result.phases, ['01', '02'], 'bracket phase ids must be visible to the probe');
      assert.equal(result.phase_count, 2, "the sibling milestone's phase must stay out of the window");
    } finally {
      cleanup(tmp);
    }
  });

  test('phase add rejects a bracket milestone heading in the description; ROADMAP and phase dirs untouched', () => {
    const tmp = createTempProject('msd-2761-add-');
    try {
      writeBracketProject(tmp);
      const before = readRoadmap(tmp);
      const dirsBefore = listPhaseDirs(tmp);
      const res = runMsdTools(['phase', 'add', 'Sneaky\n## [MSD.09] Hidden'], tmp);
      assert.equal(res.success, false, 'phase add must reject a bracket milestone heading on a bracket repo');
      assert.match(res.error || res.output, /\[MSD\.09\] Hidden/, 'error must name the offending line');
      assert.equal(readRoadmap(tmp), before, 'ROADMAP.md must be byte-unchanged');
      assert.deepEqual(listPhaseDirs(tmp), dirsBefore, 'no phase directory may be created');
    } finally {
      cleanup(tmp);
    }
  });

  test('the same description is ACCEPTED on a non-bracket twin (opt-in only, base behaviour preserved)', () => {
    const tmp = createTempProject('msd-2761-add-legacy-');
    try {
      writeLegacyTwinProject(tmp);
      const res = runMsdTools(['phase', 'add', 'Sneaky\n## [MSD.09] Hidden'], tmp);
      assert.equal(res.success, true, `a project that has not opted in must be unaffected: ${res.error || ''}`);
    } finally {
      cleanup(tmp);
    }
  });

  test('phase insert and add-batch reject the same shape on a bracket repo', () => {
    const tmp = createTempProject('msd-2761-batch-');
    try {
      writeBracketProject(tmp);
      const before = readRoadmap(tmp);
      const batch = runMsdTools(
        ['phase', 'add-batch', '--descriptions', JSON.stringify(['Good phase', 'Bad\n## [MSD.09] Hidden'])],
        tmp
      );
      assert.equal(batch.success, false, 'add-batch must reject the bracket shape');
      assert.equal(readRoadmap(tmp), before, 'ROADMAP.md must be byte-unchanged (all-or-nothing)');

      const insert = runMsdTools(['phase', 'insert', '1', 'Sneaky\n## [MSD.09] Hidden'], tmp);
      assert.equal(insert.success, false, 'phase insert must reject the bracket shape');
      assert.equal(readRoadmap(tmp), before, 'ROADMAP.md must be byte-unchanged');
    } finally {
      cleanup(tmp);
    }
  });

  test('a bracket PHASE heading and a FENCED bracket milestone heading are not violations', () => {
    const tmp = createTempProject('msd-2761-nofalse-');
    try {
      writeBracketProject(tmp);
      const phaseHeading = runMsdTools(['phase', 'add', 'Refs\n### [MSD.02] 07: cross ref'], tmp);
      assert.equal(
        phaseHeading.success,
        true,
        `a bracket PHASE heading never terminates a window and must not be flagged: ${phaseHeading.error || ''}`
      );

      const fenced = runMsdTools(['phase', 'add', 'Docs\n\n```markdown\n## [MSD.09] Example\n```\n'], tmp);
      assert.equal(
        fenced.success,
        true,
        `a FENCED bracket milestone heading must not be flagged (parser is fence-aware): ${fenced.error || ''}`
      );
    } finally {
      cleanup(tmp);
    }
  });

  test('ordinary bracket-repo descriptions still succeed (no false rejection)', () => {
    const tmp = createTempProject('msd-2761-ok-');
    try {
      writeBracketProject(tmp);
      const res = runMsdTools(['phase', 'add', 'Authentication and sessions'], tmp);
      assert.equal(res.success, true, `ordinary add must keep working on a bracket repo: ${res.error || ''}`);
    } finally {
      cleanup(tmp);
    }
  });
});