import contextlib
import importlib.util
import io
import json
from pathlib import Path
import tempfile
import unittest

spec = importlib.util.spec_from_file_location(
    'image_summary', Path(__file__).with_name('summarize-image-security.py'))
summary = importlib.util.module_from_spec(spec)
spec.loader.exec_module(summary)


class ImageSummary(unittest.TestCase):
    def test_reports_global_npm_path_and_preserves_failure(self):
        with tempfile.TemporaryDirectory() as directory:
            path = Path(directory) / 'image-security.json'
            path.write_text(json.dumps({'Results': [{'Vulnerabilities': [{
                'Severity': 'HIGH', 'VulnerabilityID': 'CVE-example',
                'PkgName': 'pacote', 'InstalledVersion': '19.0.2',
                'FixedVersion': '21.5.1',
                'PkgPath': 'usr/local/lib/node_modules/npm/node_modules/pacote/package.json',
            }]}]}))
            output = io.StringIO()
            with contextlib.redirect_stdout(output):
                self.assertEqual(summary.summarize(path), 1)
            self.assertIn('19.0.2 -> 21.5.1', output.getvalue())
            self.assertIn('usr/local/lib/node_modules/npm/', output.getvalue())

    def test_missing_invalid_and_clean_reports(self):
        with tempfile.TemporaryDirectory() as directory:
            path = Path(directory) / 'image-security.json'
            with contextlib.redirect_stdout(io.StringIO()):
                self.assertEqual(summary.summarize(path), 1)
                for content in ('broken', '{}', '{"Results": null}'):
                    path.write_text(content)
                    self.assertEqual(summary.summarize(path), 1)
                path.write_text('{"Results": []}')
                self.assertEqual(summary.summarize(path), 0)