import { describe, it, afterEach } from 'node:test';
import assert from 'node:assert/strict';
import { writeFile, readFile, unlink } from 'node:fs/promises';
import { join } from 'node:path';
import { tmpdir } from 'node:os';
import { injectWrapper, removeWrapper, MARKER_START, MARKER_END } from '../bin/cli.js';

describe('injectWrapper', () => {
  const testFile = join(tmpdir(), `car-rc-test-${Date.now()}`);
  afterEach(async () => { try { await unlink(testFile); } catch {} });

  it('adds wrapper to empty file', async () => {
    await writeFile(testFile, '');
    await injectWrapper(testFile, '/path/to/launcher.js');
    const content = await readFile(testFile, 'utf-8');
    assert.ok(content.includes(MARKER_START));
    assert.ok(content.includes(MARKER_END));
    assert.ok(content.includes('/path/to/launcher.js'));
  });
  it('adds wrapper to file with existing content', async () => {
    await writeFile(testFile, 'export PATH=$HOME/bin:$PATH\n');
    await injectWrapper(testFile, '/path/to/launcher.js');
    const content = await readFile(testFile, 'utf-8');
    assert.ok(content.includes('export PATH'));
    assert.ok(content.includes(MARKER_START));
  });
  it('replaces existing wrapper', async () => {
    await writeFile(testFile, `before\n${MARKER_START}\nold stuff\n${MARKER_END}\nafter\n`);
    await injectWrapper(testFile, '/new/path/launcher.js');
    const content = await readFile(testFile, 'utf-8');
    assert.ok(content.includes('/new/path'));
    assert.ok(!content.includes('old stuff'));
    assert.ok(content.includes('before'));
    assert.ok(content.includes('after'));
  });
});

describe('removeWrapper', () => {
  const testFile = join(tmpdir(), `car-rm-test-${Date.now()}`);
  afterEach(async () => { try { await unlink(testFile); } catch {} });

  it('removes wrapper and preserves surrounding content', async () => {
    await writeFile(testFile, `before\n${MARKER_START}\nwrapper stuff\n${MARKER_END}\nafter\n`);
    await removeWrapper(testFile);
    const content = await readFile(testFile, 'utf-8');
    assert.ok(!content.includes(MARKER_START));
    assert.ok(content.includes('before'));
    assert.ok(content.includes('after'));
  });
  it('does nothing when no wrapper present', async () => {
    await writeFile(testFile, 'just normal content\n');
    await removeWrapper(testFile);
    const content = await readFile(testFile, 'utf-8');
    assert.equal(content, 'just normal content\n');
  });
});