import json
from pathlib import Path
import subprocess
import tempfile
import unittest

SCRIPT = Path(__file__).resolve().parents[1] / 'runner/configure-docker.py'

class DockerConfigurationTest(unittest.TestCase):
    def test_merge_preserves_existing_settings_and_is_idempotent(self):
        with tempfile.TemporaryDirectory() as directory:
            path = Path(directory) / 'daemon.json'
            original = {'features': {'buildkit': True}, 'insecure-registries': ['existing:5000']}
            path.write_text(json.dumps(original))
            for _ in range(2):
                result = subprocess.run(['python3', str(SCRIPT), str(path)], capture_output=True, text=True)
                self.assertEqual(0, result.returncode, result.stderr)
            actual = json.loads(path.read_text())
            self.assertEqual(original['features'], actual['features'])
            self.assertEqual(['existing:5000', '192.168.2.28:3000'], actual['insecure-registries'])
            self.assertEqual(original, json.loads(path.with_name('daemon.json.before-agiledancers').read_text()))
    def test_invalid_configuration_is_left_unchanged(self):
        with tempfile.TemporaryDirectory() as directory:
            path = Path(directory) / 'daemon.json'
            original = '{"insecure-registries": "invalid"}'
            path.write_text(original)
            result = subprocess.run(['python3', str(SCRIPT), str(path)], capture_output=True, text=True)
            self.assertNotEqual(0, result.returncode)
            self.assertEqual(original, path.read_text())