import subprocess
import sys
import tempfile
import unittest
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
CLI = ROOT / 'changelog.py'

class IntegrationTests(unittest.TestCase):
    def git(self, repo, *args):
        return subprocess.run(['git', '-C', str(repo), *args], check=True, text=True, capture_output=True)

    def test_revision_range_to_output_file(self):
        with tempfile.TemporaryDirectory() as tmp:
            repo = Path(tmp)
            self.git(repo, 'init', '-q')
            self.git(repo, 'config', 'user.name', 'Fixture User')
            self.git(repo, 'config', 'user.email', 'fixture@example.invalid')
            (repo / 'file.txt').write_text('one\n', encoding='utf-8')
            self.git(repo, 'add', 'file.txt')
            self.git(repo, 'commit', '-q', '-m', 'chore: initial fixture')
            self.git(repo, 'tag', 'v1.0.0')
            (repo / 'file.txt').write_text('one\ntwo\n', encoding='utf-8')
            self.git(repo, 'commit', '-qam', 'feat(api): add export')
            (repo / 'file.txt').write_text('one\ntwo\nthree\n', encoding='utf-8')
            self.git(repo, 'commit', '-qam', 'fix!: reject malformed rows')
            output = repo / 'CHANGELOG.draft.md'
            subprocess.run([sys.executable, str(CLI), '--repo', str(repo), '--since', 'v1.0.0', '--title', '1.1.0', '--output', str(output)], check=True)
            text = output.read_text(encoding='utf-8')
            self.assertIn('## [1.1.0]', text)
            self.assertIn('### Added\n\n- **api:** add export', text)
            self.assertIn('### Fixed\n\n- **BREAKING:** reject malformed rows', text)
            self.assertNotIn('initial fixture', text)

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