import os
import unittest
import tempfile
import shutil
import yaml
from pathlib import Path
import subprocess

class TestGenerateDefaultApplicationsUsers(unittest.TestCase):
    def setUp(self):
        # Setup temporary roles directory
        self.temp_dir = Path(tempfile.mkdtemp())
        self.roles_dir = self.temp_dir / "roles"
        self.roles_dir.mkdir()

        # Sample role with users meta
        self.role = self.roles_dir / "docker-app-with-users"
        (self.role / "vars").mkdir(parents=True)
        (self.role / "meta").mkdir(parents=True)

        # Write application_id and configuration
        (self.role / "vars" / "main.yml").write_text("application_id: app_with_users\n")
        (self.role / "vars" / "configuration.yml").write_text("setting: value\n")

        # Write users meta
        users_meta = {
            'users': {
                'alice': {'uid': 2001, 'gid': 2001},
                'bob': {'uid': 2002, 'gid': 2002}
            }
        }
        with (self.role / "meta" / "users.yml").open('w', encoding='utf-8') as f:
            yaml.dump(users_meta, f)

        # Output file path
        self.output_file = self.temp_dir / "output.yml"

    def tearDown(self):
        shutil.rmtree(self.temp_dir)

    def test_users_injection(self):
        """
        When a users.yml exists with defined users, the script should inject a 'users'
        mapping in the generated YAML, mapping each username to a Jinja2 reference.
        """
        script_path = Path(__file__).resolve().parents[2] / "cli" / "generate-applications-defaults.py"
        result = subprocess.run([
            "python3", str(script_path),
            "--roles-dir", str(self.roles_dir),
            "--output-file", str(self.output_file)
        ], capture_output=True, text=True)
        self.assertEqual(result.returncode, 0, msg=result.stderr)
        data = yaml.safe_load(self.output_file.read_text())

        apps = data.get('defaults_applications', {})
        # Only the app with users should be present
        self.assertIn('app_with_users', apps)

        # 'users' section should be present and correct
        users_map = apps['app_with_users']['users']
        expected = {'alice': '{{ users["alice"] }}', 'bob': '{{ users["bob"] }}'}
        self.assertEqual(users_map, expected)

if __name__ == '__main__':
    unittest.main()