import { test } from 'node:test';
import { strict as assert } from 'node:assert';
import { mkdtempSync, mkdirSync, writeFileSync, rmSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import {
  discoverProject,
  checkPhaseRequirements,
} from '../../lib/parsers/project-discovery.mjs';

function setupProject(structure) {
  const root = mkdtempSync(join(tmpdir(), 'ultraplan-disc-'));
  for (const [path, content] of Object.entries(structure)) {
    const full = join(root, path);
    mkdirSync(join(full, '..'), { recursive: true });
    writeFileSync(full, content);
  }
  return root;
}

test('discoverProject — finds brief, plan, progress at root', () => {
  const root = setupProject({
    'brief.md': 'b',
    'plan.md': 'p',
    'progress.json': '{}',
  });
  try {
    const a = discoverProject(root);
    assert.equal(a.brief, join(root, 'brief.md'));
    assert.equal(a.plan, join(root, 'plan.md'));
    assert.equal(a.progress, join(root, 'progress.json'));
  } finally {
    rmSync(root, { recursive: true, force: true });
  }
});

test('discoverProject — research files sorted by name', () => {
  const root = setupProject({
    'brief.md': 'b',
    'research/03-third.md': 't',
    'research/01-first.md': 'f',
    'research/02-second.md': 's',
  });
  try {
    const a = discoverProject(root);
    assert.equal(a.research.length, 3);
    assert.match(a.research[0], /01-first/);
    assert.match(a.research[1], /02-second/);
    assert.match(a.research[2], /03-third/);
  } finally {
    rmSync(root, { recursive: true, force: true });
  }
});

test('discoverProject — architecture overview + gaps detected', () => {
  const root = setupProject({
    'brief.md': 'b',
    'architecture/overview.md': 'o',
    'architecture/gaps.md': 'g',
  });
  try {
    const a = discoverProject(root);
    assert.match(a.architecture.overview, /architecture\/overview\.md$/);
    assert.match(a.architecture.gaps, /architecture\/gaps\.md$/);
    assert.equal(a.architecture.looseFiles.length, 0);
  } finally {
    rmSync(root, { recursive: true, force: true });
  }
});

test('discoverProject — loose architecture files surfaced for drift detection', () => {
  const root = setupProject({
    'architecture/overview.md': 'o',
    'architecture/random-note.md': 'x',
  });
  try {
    const a = discoverProject(root);
    assert.equal(a.architecture.looseFiles.length, 1);
    assert.match(a.architecture.looseFiles[0], /random-note/);
  } finally {
    rmSync(root, { recursive: true, force: true });
  }
});

test('discoverProject — missing project dir returns empty artifacts', () => {
  const a = discoverProject('/nonexistent/path/unlikely');
  assert.equal(a.brief, null);
  assert.equal(a.research.length, 0);
});

test('checkPhaseRequirements — research needs brief', () => {
  const r = checkPhaseRequirements({ brief: null }, 'research');
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'PROJECT_NO_BRIEF'));
});

test('checkPhaseRequirements — execute needs plan', () => {
  const r = checkPhaseRequirements({ brief: 'x', plan: null }, 'execute');
  assert.equal(r.valid, false);
  assert.ok(r.errors.find(e => e.code === 'PROJECT_NO_PLAN'));
});

test('checkPhaseRequirements — happy path', () => {
  const r = checkPhaseRequirements({ brief: 'x', plan: 'y' }, 'plan');
  assert.equal(r.valid, true);
});

test('discoverProject — finds review.md when present', () => {
  const root = setupProject({
    'brief.md': 'b',
    'review.md': 'r',
  });
  try {
    const a = discoverProject(root);
    assert.equal(a.review, join(root, 'review.md'));
  } finally {
    rmSync(root, { recursive: true, force: true });
  }
});

test('discoverProject — review null when absent', () => {
  const root = setupProject({
    'brief.md': 'b',
  });
  try {
    const a = discoverProject(root);
    assert.equal(a.review, null);
  } finally {
    rmSync(root, { recursive: true, force: true });
  }
});

test('checkPhaseRequirements — review phase needs brief (error) and tolerates missing progress (warning)', () => {
  // Missing brief → error
  const r1 = checkPhaseRequirements({ brief: null, progress: null }, 'review');
  assert.equal(r1.valid, false);
  assert.ok(r1.errors.find(e => e.code === 'PROJECT_NO_BRIEF'));

  // Has brief, no progress → valid (with warning)
  const r2 = checkPhaseRequirements({ brief: 'x', progress: null }, 'review');
  assert.equal(r2.valid, true, JSON.stringify(r2));
  assert.ok(r2.warnings.find(w => w.code === 'PROJECT_NO_PROGRESS'));

  // Has both → valid, no warning
  const r3 = checkPhaseRequirements({ brief: 'x', progress: 'p' }, 'review');
  assert.equal(r3.valid, true);
  assert.equal(r3.warnings.length, 0);
});