"""Tests for database utility functions."""
import pytest
from unittest.mock import MagicMock, patch


class TestArtifactRepository:
    """Tests for ArtifactRepository."""

    def test_batch_dependency_values_formatting(self):
        """batch_upsert_dependencies should format values correctly."""
        from app.db_utils import ArtifactRepository

        deps = [
            ("_pypi", "numpy", ">=1.21.0"),
            ("_pypi", "requests", "*"),
            ("myproject", "mylib", "==1.0.0"),
        ]

        values = ArtifactRepository._format_dependency_values("abc123", deps)

        assert len(values) == 3
        assert values[0] == {
            "artifact_id": "abc123",
            "dependency_project": "_pypi",
            "dependency_package": "numpy",
            "version_constraint": ">=1.21.0",
        }
        assert values[2]["dependency_project"] == "myproject"

    def test_empty_dependencies_returns_empty_list(self):
        """Empty dependency list should return empty values."""
        from app.db_utils import ArtifactRepository

        values = ArtifactRepository._format_dependency_values("abc123", [])

        assert values == []

    def test_format_dependency_values_preserves_special_characters(self):
        """Version constraints with special characters should be preserved."""
        from app.db_utils import ArtifactRepository

        deps = [
            ("_pypi", "package-name", ">=1.0.0,<2.0.0"),
            ("_pypi", "another_pkg", "~=1.4.2"),
        ]

        values = ArtifactRepository._format_dependency_values("hash123", deps)

        assert values[0]["version_constraint"] == ">=1.0.0,<2.0.0"
        assert values[1]["version_constraint"] == "~=1.4.2"

    def test_batch_upsert_dependencies_returns_zero_for_empty(self):
        """batch_upsert_dependencies should return 0 for empty list without DB call."""
        from app.db_utils import ArtifactRepository

        mock_db = MagicMock()
        repo = ArtifactRepository(mock_db)

        result = repo.batch_upsert_dependencies("abc123", [])

        assert result == 0
        # Verify no DB operations were performed
        mock_db.execute.assert_not_called()

    def test_get_or_create_artifact_builds_correct_statement(self):
        """get_or_create_artifact should use ON CONFLICT DO UPDATE."""
        from app.db_utils import ArtifactRepository
        from app.models import Artifact

        mock_db = MagicMock()
        mock_result = MagicMock()
        mock_artifact = MagicMock()
        mock_artifact.ref_count = 1
        mock_result.scalar_one.return_value = mock_artifact
        mock_db.execute.return_value = mock_result

        repo = ArtifactRepository(mock_db)
        artifact, created = repo.get_or_create_artifact(
            sha256="abc123def456",
            size=1024,
            filename="test.whl",
            content_type="application/zip",
        )

        assert mock_db.execute.called
        assert created is True
        assert artifact == mock_artifact

    def test_get_or_create_artifact_existing_not_created(self):
        """get_or_create_artifact should return created=False for existing artifact."""
        from app.db_utils import ArtifactRepository

        mock_db = MagicMock()
        mock_result = MagicMock()
        mock_artifact = MagicMock()
        mock_artifact.ref_count = 5  # Existing artifact with ref_count > 1
        mock_result.scalar_one.return_value = mock_artifact
        mock_db.execute.return_value = mock_result

        repo = ArtifactRepository(mock_db)
        artifact, created = repo.get_or_create_artifact(
            sha256="abc123def456",
            size=1024,
            filename="test.whl",
        )

        assert created is False

    def test_get_cached_url_with_artifact_returns_tuple(self):
        """get_cached_url_with_artifact should return (CachedUrl, Artifact) tuple."""
        from app.db_utils import ArtifactRepository

        mock_db = MagicMock()
        mock_cached_url = MagicMock()
        mock_artifact = MagicMock()
        mock_db.query.return_value.join.return_value.filter.return_value.first.return_value = (
            mock_cached_url,
            mock_artifact,
        )

        repo = ArtifactRepository(mock_db)
        result = repo.get_cached_url_with_artifact("url_hash_123")

        assert result == (mock_cached_url, mock_artifact)

    def test_get_cached_url_with_artifact_returns_none_when_not_found(self):
        """get_cached_url_with_artifact should return None when URL not cached."""
        from app.db_utils import ArtifactRepository

        mock_db = MagicMock()
        mock_db.query.return_value.join.return_value.filter.return_value.first.return_value = None

        repo = ArtifactRepository(mock_db)
        result = repo.get_cached_url_with_artifact("nonexistent_hash")

        assert result is None

    def test_get_artifact_dependencies_returns_list(self):
        """get_artifact_dependencies should return list of dependencies."""
        from app.db_utils import ArtifactRepository

        mock_db = MagicMock()
        mock_dep1 = MagicMock()
        mock_dep2 = MagicMock()
        mock_db.query.return_value.filter.return_value.all.return_value = [
            mock_dep1,
            mock_dep2,
        ]

        repo = ArtifactRepository(mock_db)
        result = repo.get_artifact_dependencies("artifact_hash_123")

        assert len(result) == 2
        assert result[0] == mock_dep1
        assert result[1] == mock_dep2

    def test_get_artifact_dependencies_returns_empty_list(self):
        """get_artifact_dependencies should return empty list when no dependencies."""
        from app.db_utils import ArtifactRepository

        mock_db = MagicMock()
        mock_db.query.return_value.filter.return_value.all.return_value = []

        repo = ArtifactRepository(mock_db)
        result = repo.get_artifact_dependencies("artifact_without_deps")

        assert result == []