import bz2
import io
import json
import tarfile
import tempfile
import unittest
from pathlib import Path
import sys
sys.path.insert(0,str(Path(__file__).resolve().parents[1]/'scripts'))
from sync import parse_archive,reconcile
from validate import validate

class SyncTests(unittest.TestCase):
    def test_roundtrip_and_deletions(self):
        with tempfile.TemporaryDirectory() as tmp:
            p=Path(tmp);archive=p/'test.tar.bz2'
            data=json.dumps({'document':{'category':'csaf_vex'},'vulnerabilities':[]}).encode()
            with tarfile.open(archive,'w:bz2') as tf:
                for name in ('csaf-vex/2025/cve-2025-12345.json','csaf-vex/2016/cve-2016-9999.json'):
                    info=tarfile.TarInfo(name);info.size=len(data);tf.addfile(info,io.BytesIO(data))
            count, digest=parse_archive(archive,2017,p/"staging")
            self.assertEqual(count,1)
            self.assertTrue((p/'staging/2025/CVE-2025-12345.json').exists())
            import os
            cwd=Path.cwd();os.chdir(p)
            try:
                result=reconcile(p/'staging',Path('data/vex'),Path('state/sync.json'),'test',2017,count,digest)
                self.assertEqual(result['record_count'],1)
                validate()
                (Path('data/vex/2025')/'CVE-2025-12345.json').unlink()
                reconcile(p/'staging',Path('data/vex'),Path('state/sync.json'),'test',2017,count,digest)
                validate()
            finally:os.chdir(cwd)
    def test_document_without_vulnerabilities_is_preserved(self):
        with tempfile.TemporaryDirectory() as tmp:
            p=Path(tmp); archive=p/'document-only.tar.bz2'
            data=json.dumps({'document': {'category': 'csaf_vex', 'csaf_version': '2.0'}}).encode()
            with tarfile.open(archive,'w:bz2') as tf:
                member=tarfile.TarInfo('csaf-vex/2024/cve-2018-15157.json')
                member.size=len(data)
                tf.addfile(member,io.BytesIO(data))
            count, digest=parse_archive(archive,2017,p/"staging")
            self.assertEqual(count,1)
            self.assertTrue((p/'staging/2018/CVE-2018-15157.json').exists())
            import os
            cwd=Path.cwd();os.chdir(p)
            try:
                reconcile(p/'staging',Path('data/vex'),Path('state/sync.json'),'test',2017,count,digest)
                validate()
            finally:os.chdir(cwd)

    def test_invalid_csaf_fails_before_write(self):
        with tempfile.TemporaryDirectory() as tmp:
            p=Path(tmp);archive=p/'bad.tar.bz2'
            data=b'{bad'
            with tarfile.open(archive,'w:bz2') as tf:
                x=tarfile.TarInfo('cve-2026-1111.json');x.size=len(data);tf.addfile(x,io.BytesIO(data))
            with self.assertRaises(json.JSONDecodeError):parse_archive(archive,2017,p/"staging")

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