import unittest
from pathlib import Path
import build
import tempfile
import subprocess
from unittest.mock import patch


class BuildContract(unittest.TestCase):
    def test_real_git_source_rejects_wrong_revision_and_dirty_checkout(self):
        with tempfile.TemporaryDirectory() as directory:
            source = Path(directory)
            def git(*args):
                return subprocess.check_output(["git", "-C", str(source), *args], stderr=subprocess.STDOUT).decode().strip()
            git("init", "--quiet")
            (source / "source.txt").write_text("fixture")
            git("add", "source.txt")
            git("-c", "user.name=karl", "-c", "user.email=fixture@invalid", "commit", "--quiet", "-m", "fixture")
            with self.assertRaises(ValueError):
                build.validate_source(source)
            with patch.object(build, "UPSTREAM", git("rev-parse", "HEAD")):
                build.validate_source(source)
                (source / "source.txt").write_text("changed")
                with self.assertRaises(ValueError):
                    build.validate_source(source)

    def test_shared_helpers_load_without_running_build_or_downloading(self):
        self.assertTrue(callable(build.shared_helper("build_runtime.py").bundle_windows_crt))
        self.assertTrue(callable(build.shared_helper("provision_vulkan.py").provision))


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