"""Model downloads are stubbed: assert asset scope and failed validation behavior."""
import importlib.util
from pathlib import Path
import sys
import tempfile
from types import SimpleNamespace
import unittest
from unittest.mock import Mock, patch

SPEC = importlib.util.spec_from_file_location('deploy_models', Path(__file__).parents[1] / 'deploy_models.py')
models = importlib.util.module_from_spec(SPEC)
SPEC.loader.exec_module(models)


class DownloadTests(unittest.TestCase):
    def setUp(self):
        self.temp = tempfile.TemporaryDirectory()
        self.addCleanup(self.temp.cleanup)
        self.enterContext(patch.object(models, 'ROOT', Path(self.temp.name)))
        self.hub = SimpleNamespace(snapshot_download=Mock(), hf_hub_download=Mock())
        self.enterContext(patch.dict(sys.modules, huggingface_hub=self.hub))

    def test_valid_local_assets_skip_network(self):
        with patch.object(models, 'bge_valid', return_value=True), \
                patch.object(models, 'tokenizer_valid', return_value=True):
            models.download()
        self.hub.snapshot_download.assert_not_called()
        self.hub.hf_hub_download.assert_not_called()

    def test_fresh_server_downloads_only_bge_and_deepseek_tokenizer(self):
        with patch.object(models, 'bge_valid', side_effect=[False, True]), \
                patch.object(models, 'tokenizer_valid', side_effect=[False, True]):
            models.download()
        self.assertEqual(self.hub.snapshot_download.call_args.args, ('BAAI/bge-large-zh-v1.5',))
        patterns = self.hub.snapshot_download.call_args.kwargs['allow_patterns']
        self.assertIn('pytorch_model.bin', patterns)
        self.assertNotIn('*.py', patterns)
        self.assertEqual(self.hub.hf_hub_download.call_args.args,
                         ('deepseek-ai/DeepSeek-V3', 'tokenizer.json'))

    def test_broken_download_is_not_success(self):
        with patch.object(models, 'bge_valid', return_value=False):
            with self.assertRaisesRegex(ValueError, 'bge_model_validation_failed'):
                models.download()
        self.hub.hf_hub_download.assert_not_called()

    def test_broken_tokenizer_is_not_success(self):
        with patch.object(models, 'bge_valid', return_value=True), \
                patch.object(models, 'tokenizer_valid', return_value=False):
            with self.assertRaisesRegex(ValueError, 'summary_tokenizer_validation_failed'):
                models.download()

    def test_active_model_validation_never_repairs_or_downloads(self):
        with patch.object(models, 'bge_valid', return_value=False):
            with self.assertRaisesRegex(ValueError, 'stop_before_repair'):
                models.download(check_only=True)
        self.hub.snapshot_download.assert_not_called()
        self.hub.hf_hub_download.assert_not_called()


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