import { test } from 'node:test';
import assert from 'node:assert/strict';
import { runInNewContext } from 'node:vm';
import { readFileSync } from 'node:fs';
import { patchSettings, target } from './install-host-settings.mjs';

test('settings use host persistence on domains without changing loopback facts', () => {
  for (const isLoopback of [false, true]) {
    const ctx = { remote: { $host: { isLoopback } } };
    const source = '(function(ctx) { ' + target + ' return persistence; })(ctx)';
    assert.equal(runInNewContext(patchSettings(source, '0.2.0-rc.2'), { ctx }), 'host');
    assert.equal(ctx.remote.$host.isLoopback, isLoopback);
  }
});

test('reject unsupported versions, changed selectors, duplicates and repeat installation', () => {
  assert.throws(() => patchSettings(target, '0.2.0-rc.3'), /unsupported DSH version/);
  for (const source of ['', target.replace('isLoopback', 'isLocal'), target + target,
    patchSettings(target, '0.2.0-rc.2')]) {
    assert.throws(() => patchSettings(source, '0.2.0-rc.2'), /exactly one/);
  }
});

test('patch leaves surrounding code unchanged and is wired into the image', () => {
  const source = 'before; ' + target + ' after;';
  const result = patchSettings(source, '0.2.0-rc.2');
  assert.ok(result.startsWith('before; '));
  assert.ok(result.endsWith(' after;'));
  const dockerfile = readFileSync(new URL('./Dockerfile', import.meta.url), 'utf8');
  assert.ok(dockerfile.includes('COPY install-host-settings.mjs /usr/local/lib/dsh-mgr/install-host-settings.mjs'));
  assert.ok(dockerfile.indexOf('RUN node /usr/local/lib/dsh-mgr/install-host-settings.mjs') > dockerfile.indexOf('npm install --global --foreground-scripts'));
});