import { describe, it, beforeEach, afterEach } from 'node:test';
import assert from 'node:assert/strict';
import { resolve, join } from 'node:path';
import { fileURLToPath } from 'node:url';
import { cp, rm, readFile, stat } from 'node:fs/promises';
import { mkdirSync, existsSync, readdirSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { execFileSync } from 'node:child_process';
import { hermeticEnv, HERMETIC_HOME } from '../helpers/hermetic-home.mjs';

const __dirname = fileURLToPath(new URL('.', import.meta.url));
const FIXTURES = resolve(__dirname, '../fixtures');
const FIXABLE = resolve(FIXTURES, 'fixable-project');
const FIX_CLI = resolve(__dirname, '../../scanners/fix-cli.mjs');

/** Create a temporary copy of the fixable-project fixture. */
async function createTmpCopy() {
  const tmpDir = join(tmpdir(), `config-audit-cli-test-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`);
  mkdirSync(tmpDir, { recursive: true });
  await cp(FIXABLE, tmpDir, { recursive: true });
  return tmpDir;
}

describe('fix-cli dry-run', () => {
  it('shows planned fixes without --apply', () => {
    const result = execFileSync('node', [FIX_CLI, FIXABLE, '--json'], {
      encoding: 'utf-8',
      timeout: 30000,
      env: hermeticEnv(),
    });
    const output = JSON.parse(result);
    assert.ok(Array.isArray(output.planned), 'Should have planned array');
    assert.ok(output.planned.length > 0, 'Should have planned fixes');
    assert.strictEqual(output.backupId, null, 'No backup in dry-run');
    assert.ok(Array.isArray(output.manual), 'Should have manual array');

    // Regression lock (HOME-leak class): a project-scoped fix run must surface only
    // project-local findings, never HOME-scoped SKL/COL findings read from the
    // developer's real ~/.claude. Without a hermetic HOME the spawned CLI picks up
    // CA-SKL-001 from installed skills, making this test machine-dependent.
    const homeScoped = output.manual.filter((m) => /^CA-(SKL|COL)-/.test(m.findingId));
    assert.deepStrictEqual(
      homeScoped.map((m) => m.findingId),
      [],
      'fix-cli leaked HOME-scoped findings — spawn is not HOME-isolated',
    );
  });

  it('outputs valid JSON with --json flag', () => {
    const result = execFileSync('node', [FIX_CLI, FIXABLE, '--json'], {
      encoding: 'utf-8',
      timeout: 30000,
      env: hermeticEnv(),
    });
    assert.doesNotThrow(() => JSON.parse(result), 'Output should be valid JSON');
  });
});

describe('fix-cli --apply', () => {
  let tmpDir;

  beforeEach(async () => {
    tmpDir = await createTmpCopy();
  });

  afterEach(async () => {
    if (tmpDir) await rm(tmpDir, { recursive: true, force: true });
  });

  it('applies fixes and creates backup', () => {
    const result = execFileSync('node', [FIX_CLI, tmpDir, '--apply', '--json'], {
      encoding: 'utf-8',
      timeout: 30000,
      env: hermeticEnv(),
    });
    const output = JSON.parse(result);
    assert.ok(output.applied.length > 0, 'Should have applied fixes');
    assert.ok(output.backupId, 'Should have a backup ID');

    // Verify backup exists. The CLI runs with a hermetic HOME (see execFileSync env
    // below), so its backups land under HERMETIC_HOME, not the developer's real home.
    const backupDir = join(HERMETIC_HOME, '.config-audit', 'backups', output.backupId);
    assert.ok(existsSync(backupDir), 'Backup directory should exist');
  });

  it('actually modifies files after --apply', async () => {
    execFileSync('node', [FIX_CLI, tmpDir, '--apply'], {
      encoding: 'utf-8',
      timeout: 30000,
      env: hermeticEnv(),
    });

    // Check that settings.json was fixed
    const content = await readFile(join(tmpDir, '.claude', 'settings.json'), 'utf-8');
    const parsed = JSON.parse(content);
    assert.ok(parsed.$schema, 'Should have $schema after fix');
  });

  it('reports verified fixes', () => {
    const result = execFileSync('node', [FIX_CLI, tmpDir, '--apply', '--json'], {
      encoding: 'utf-8',
      timeout: 30000,
      env: hermeticEnv(),
    });
    const output = JSON.parse(result);
    assert.ok(Array.isArray(output.verified), 'Should have verified array');
    assert.ok(output.verified.length > 0, 'Should have verified fixes');
  });
});