from pathlib import Path
from unittest.mock import MagicMock, patch

import pytest
from arcade_core.errors import ToolkitLoadError
from arcade_core.toolkit import Toolkit, Validate


class TestToolkit:
    """Test the Toolkit class functionality."""

    def test_strip_arcade_prefix_validator(self):
        """Test that the name validator strips the arcade_ prefix."""
        toolkit = Toolkit(
            name="arcade_test",
            package_name="arcade_test",
            description="Test toolkit",
            version="1.0.0",
        )
        assert toolkit.name == "test"

    def test_no_arcade_prefix_unchanged(self):
        """Test that names without arcade_ prefix remain unchanged."""
        toolkit = Toolkit(
            name="mytest",
            package_name="mytest",
            description="Test toolkit",
            version="1.0.0",
        )
        assert toolkit.name == "mytest"

    def test_strip_arcade_prefix_method(self):
        """Test the _strip_arcade_prefix static method."""
        assert Toolkit._strip_arcade_prefix("arcade_test") == "test"
        assert Toolkit._strip_arcade_prefix("test") == "test"
        assert Toolkit._strip_arcade_prefix("arcade_my_toolkit") == "my_toolkit"
        assert Toolkit._strip_arcade_prefix("myarcade_toolkit") == "myarcade_toolkit"
        assert Toolkit._strip_arcade_prefix("") == ""
        assert Toolkit._strip_arcade_prefix("arcade_") == ""


class TestFromEntrypoint:
    """Test the from_entrypoint class method."""

    @patch("arcade_core.toolkit.Toolkit.from_package")
    def test_from_entrypoint_success(self, mock_from_package):
        """Test successful creation of toolkit from entry point."""
        # Create mock entry point with dist
        mock_entry = MagicMock()
        mock_entry.value = "my_toolkit"
        mock_entry.name = "toolkit_name"
        mock_entry.dist = MagicMock()
        mock_entry.dist.name = "my-toolkit"

        # Mock the from_package return
        mock_toolkit = Toolkit(
            name="my_toolkit",
            package_name="my-toolkit",
            version="1.2.3",
            description="My test toolkit",
            author=["Test Author"],
            homepage="https://github.com/test/toolkit",
        )
        mock_from_package.return_value = mock_toolkit

        toolkit = Toolkit.from_entrypoint(mock_entry)

        mock_from_package.assert_called_once_with("my-toolkit")
        assert toolkit.name == "my_toolkit"
        assert toolkit.package_name == "my-toolkit"

    def test_from_entrypoint_no_dist(self):
        """Test handling when entry point has no dist attribute."""
        # Create mock entry point without dist
        mock_entry = MagicMock()
        mock_entry.value = "my_toolkit"
        mock_entry.name = "toolkit_name"
        mock_entry.dist = None

        with pytest.raises(ToolkitLoadError, match="does not have distribution metadata"):
            Toolkit.from_entrypoint(mock_entry)


class TestFindArcadeToolkitsFromEntrypoints:
    """Test the find_arcade_toolkits_from_entrypoints method."""

    @patch("arcade_core.toolkit.importlib.metadata.entry_points")
    @patch("arcade_core.toolkit.Toolkit.from_entrypoint")
    def test_find_from_entrypoints_success(self, mock_from_ep, mock_entry_points):
        """Test successful discovery of toolkits from entry points."""
        # Create mock entry points
        mock_ep1 = MagicMock()
        mock_ep1.name = "toolkit_name"
        mock_ep1.value = "toolkit1"
        mock_ep2 = MagicMock()
        mock_ep2.name = "toolkit_name"
        mock_ep2.value = "toolkit2"

        mock_entry_points.return_value = [mock_ep1, mock_ep2]

        # Create mock toolkits
        toolkit1 = Toolkit(
            name="toolkit1",
            package_name="toolkit1",
            version="1.0.0",
            description="Toolkit 1",
        )
        toolkit2 = Toolkit(
            name="toolkit2",
            package_name="toolkit2",
            version="1.0.0",
            description="Toolkit 2",
        )
        mock_from_ep.side_effect = [toolkit1, toolkit2]

        toolkits = Toolkit.find_arcade_toolkits_from_entrypoints()

        assert len(toolkits) == 2
        assert toolkits[0].name == "toolkit1"
        assert toolkits[1].name == "toolkit2"

    @patch("arcade_core.toolkit.importlib.metadata.entry_points")
    @patch("arcade_core.toolkit.Toolkit.from_entrypoint")
    def test_find_from_entrypoints_with_errors(self, mock_from_ep, mock_entry_points):
        """Test that errors in loading individual toolkits are handled gracefully."""
        # Create mock entry points
        mock_ep1 = MagicMock()
        mock_ep1.name = "toolkit_name"
        mock_ep1.value = "toolkit1"
        mock_ep2 = MagicMock()
        mock_ep2.name = "toolkit_name"
        mock_ep2.value = "toolkit2"
        mock_ep3 = MagicMock()
        mock_ep3.name = "toolkit_name"
        mock_ep3.value = "toolkit3"
        mock_entry_points.return_value = [mock_ep1, mock_ep2, mock_ep3]

        # Create mock toolkits
        toolkit1 = Toolkit(
            name="toolkit1",
            package_name="toolkit1",
            version="1.0.0",
            description="Toolkit 1",
        )
        toolkit3 = Toolkit(
            name="toolkit3",
            package_name="toolkit3",
            version="1.0.0",
            description="Toolkit 3",
        )
        mock_from_ep.side_effect = [toolkit1, ToolkitLoadError("Failed to load toolkit2"), toolkit3]

        toolkits = Toolkit.find_arcade_toolkits_from_entrypoints()

        assert len(toolkits) == 2
        assert toolkits[0].name == "toolkit1"
        assert toolkits[1].name == "toolkit3"

    @patch("arcade_core.toolkit.importlib.metadata.entry_points")
    def test_find_from_entrypoints_no_group(self, mock_entry_points):
        """Test when arcade_toolkits entry point group doesn't exist."""
        # Mock entry_points to return empty list
        mock_entry_points.return_value = []

        # Test
        toolkits = Toolkit.find_arcade_toolkits_from_entrypoints()

        assert toolkits == []


class TestFindAllArcadeToolkits:
    """Test the combined toolkit discovery method."""

    @patch("arcade_core.toolkit.Toolkit.find_arcade_toolkits_from_entrypoints")
    @patch("arcade_core.toolkit.Toolkit.find_arcade_toolkits_from_prefix")
    def test_find_all_no_duplicates(self, mock_find_prefix, mock_find_ep):
        """Test that find_all returns combined results without duplicates."""
        # Create mock toolkits
        toolkit1 = Toolkit(
            name="toolkit1",
            package_name="toolkit1",
            version="1.0.0",
            description="Toolkit 1",
        )
        toolkit2 = Toolkit(
            name="toolkit2",
            package_name="toolkit2",
            version="1.0.0",
            description="Toolkit 2",
        )
        # Mock the discovery methods
        mock_find_ep.return_value = [toolkit1]
        mock_find_prefix.return_value = [toolkit2]

        toolkits = Toolkit.find_all_arcade_toolkits()

        assert len(toolkits) == 2
        assert any(t.name == "toolkit1" for t in toolkits)
        assert any(t.name == "toolkit2" for t in toolkits)

    @patch("arcade_core.toolkit.Toolkit.find_arcade_toolkits_from_entrypoints")
    @patch("arcade_core.toolkit.Toolkit.find_arcade_toolkits_from_prefix")
    def test_find_all_with_duplicates_prefers_entrypoint(self, mock_find_prefix, mock_find_ep):
        """Test that entry point toolkits are preferred over prefix-based ones."""
        toolkit_ep = Toolkit(
            name="test",
            package_name="arcade_test",  # Same package name
            version="2.0.0",
            description="Entry point version",
        )

        toolkit_prefix = Toolkit(
            name="test",
            package_name="arcade_test",  # Same package name
            version="1.0.0",
            description="Prefix version",
        )
        # Mock the discovery methods
        mock_find_ep.return_value = [toolkit_ep]
        mock_find_prefix.return_value = [toolkit_prefix]

        toolkits = Toolkit.find_all_arcade_toolkits()

        assert len(toolkits) == 1
        assert toolkits[0].version == "2.0.0"
        assert toolkits[0].description == "Entry point version"

    @patch("arcade_core.toolkit.Toolkit.find_arcade_toolkits_from_entrypoints")
    @patch("arcade_core.toolkit.Toolkit.find_arcade_toolkits_from_prefix")
    def test_find_all_empty(self, mock_find_prefix, mock_find_ep):
        """Test when no toolkits are found."""
        mock_find_ep.return_value = []
        mock_find_prefix.return_value = []

        toolkits = Toolkit.find_all_arcade_toolkits()
        assert toolkits == []


class TestEntryPointCompatibility:
    """Test compatibility scenarios for entry point discovery."""

    @patch("arcade_core.toolkit.importlib.metadata.entry_points")
    @patch("arcade_core.toolkit.Toolkit.from_entrypoint")
    def test_duplicate_toolkit_names_in_entrypoints(self, mock_from_ep, mock_entry_points):
        """Test handling of duplicate toolkit names in entry points."""
        # Create mock entry points with same name
        mock_ep1 = MagicMock()
        mock_ep1.name = "toolkit_name"
        mock_ep1.value = "test_v1"

        mock_ep2 = MagicMock()
        mock_ep2.name = "toolkit_name"
        mock_ep2.value = "test_v2"

        mock_entry_points.return_value = [mock_ep1, mock_ep2]

        # Mock toolkit creation - both with same toolkit name
        toolkit1 = Toolkit(
            name="test",
            package_name="test_v1",
            version="1.0.0",
            description="Test v1",
        )

        toolkit2 = Toolkit(
            name="test",
            package_name="test_v2",
            version="2.0.0",
            description="Test v2",
        )

        mock_from_ep.side_effect = [toolkit1, toolkit2]

        # Should return both even with same display name
        toolkits = Toolkit.find_arcade_toolkits_from_entrypoints()
        assert len(toolkits) == 2

    @patch("arcade_core.toolkit.Toolkit.from_package")
    def test_from_entrypoint_with_arcade_prefix(self, mock_from_package):
        """Test that arcade_ prefix is stripped from entry point toolkits."""
        # Create mock entry point
        mock_entry = MagicMock()
        mock_entry.value = "arcade_example"
        mock_entry.name = "toolkit_name"
        mock_entry.dist = MagicMock()
        mock_entry.dist.name = "arcade-example"

        # Mock the from_package return
        mock_toolkit = Toolkit(
            name="arcade_example",
            package_name="arcade-example",
            version="1.0.0",
            description="Example toolkit",
        )
        mock_from_package.return_value = mock_toolkit

        toolkit = Toolkit.from_entrypoint(mock_entry)

        assert toolkit.name == "example"
        assert toolkit.package_name == "arcade-example"


class TestToolkitIntegration:
    """Integration tests for toolkit discovery and loading."""

    @patch("arcade_core.toolkit.Toolkit.find_arcade_toolkits_from_entrypoints")
    @patch("arcade_core.toolkit.Toolkit.find_arcade_toolkits_from_prefix")
    def test_mixed_toolkit_sources(self, mock_find_prefix, mock_find_ep):
        """Test discovering toolkits from both sources with various naming patterns."""
        # Create toolkits with different naming patterns
        ep_toolkit1 = Toolkit(
            name="custom",
            package_name="my_custom_toolkit",
            version="1.0.0",
            description="Custom toolkit",
        )
        ep_toolkit2 = Toolkit(
            name="utils",
            package_name="arcade_utils",
            version="2.0.0",
            description="Utils toolkit",
        )
        prefix_toolkit1 = Toolkit(
            name="legacy",
            package_name="arcade_legacy",
            version="1.0.0",
            description="Legacy toolkit",
        )
        prefix_toolkit2 = Toolkit(
            name="utils",
            package_name="arcade_utils",  # Same package name as ep_toolkit2
            version="0.9.0",
            description="Old utils toolkit",
        )
        mock_find_ep.return_value = [ep_toolkit1, ep_toolkit2]
        mock_find_prefix.return_value = [prefix_toolkit1, prefix_toolkit2]

        toolkits = Toolkit.find_all_arcade_toolkits()

        # Should have 3 toolkits (ep_toolkit2 supersedes prefix_toolkit2 due to same package_name)
        assert len(toolkits) == 3
        names = {t.name for t in toolkits}
        assert names == {"custom", "utils", "legacy"}
        utils_toolkit = next(t for t in toolkits if t.name == "utils")
        assert utils_toolkit.version == "2.0.0"


@pytest.fixture
def cleanup_test_files():
    test_files = ["valid.py", "invalid.py", "test.txt"]

    # Run the test
    yield

    # Clean up test files after the test
    for file in test_files:
        try:  # noqa: SIM105
            Path(file).unlink(missing_ok=True)
        except Exception:  # noqa: S110
            pass


class TestValidateFile:
    @pytest.mark.usefixtures("cleanup_test_files")
    def test_validate_file(self):
        """Test validation of Python files with valid syntax."""
        # Create a temporary valid Python file
        valid_file = Path("valid.py")
        valid_file.write_text("def test(): return True", encoding="utf-8")

        # Should not raise any exceptions
        Toolkit.validate_file(valid_file)
        # Test with string path
        Toolkit.validate_file(str(valid_file))

    def test_validate_tools_nonexistent_file(self):
        """Test validation with non-existent file."""
        nonexistent = Path("nonexistent.py")

        with pytest.raises(ValueError, match="File not found"):
            Toolkit.validate_file(nonexistent)

    @pytest.mark.usefixtures("cleanup_test_files")
    def test_validate_tools_non_python_file(self):
        """Test validation with non-Python file."""
        txt_file = Path("test.txt")
        txt_file.write_text("Not a Python file", encoding="utf-8")

        with pytest.raises(ValueError, match="Not a Python file"):
            Toolkit.validate_file(txt_file)

    @pytest.mark.usefixtures("cleanup_test_files")
    def test_validate_tools_syntax_error(self):
        """Test validation with Python file containing syntax errors."""
        invalid_file = Path("invalid.py")
        invalid_file.write_text("def test(): return True:", encoding="utf-8")  # Invalid syntax

        with pytest.raises(SyntaxError):
            Toolkit.validate_file(invalid_file)


class TestValidPath:
    """Test the Validate.path function for path validation during deployment and serving."""

    @pytest.mark.parametrize(
        "path_input",
        [
            # Simple valid paths
            "file.py",
            "module.py",
            "utils.py",
            "main.py",
            "README.md",
            "config.json",
            # Valid nested paths
            "src/main.py",
            "lib/utils/helper.py",
            "package/subpackage/module.py",
            "tools/scripts/deploy.py",
            "docs/api/reference.md",
            "tests/unit/test_module.py",
            # Deep nested paths
            "very/deep/nested/directory/structure/file.py",
            "a/b/c/d/e/f/g/module.py",
            # Edge cases
            "",  # Path("") creates current directory path "."
            "a",
            "1",
            # Files containing but not matching restricted patterns
            "my_dist_file.py",  # contains "dist" but doesn't match exactly
            "build_utils.py",  # contains "build" but doesn't match exactly
            "lockfile.py",  # contains "lock" but doesn't end with .lock
            "unlock.py",  # contains "lock" but doesn't end with .lock
            # Case sensitivity - these should be valid because case doesn't match exactly
            "DIST/file.py",  # "DIST" != "dist"
            "Build/file.py",  # "Build" != "build"
            "VENV/file.py",  # "VENV" != "venv"
            "Package.LOCK",  # ".LOCK" != ".lock"
            # Windows-style paths
            "src\\module.py",
            "lib\\utils\\helper.py",
            # Absolute paths that should be valid
            "/home/user/project/file.py",
            # Unicode and special characters
            "файл.py",  # Cyrillic
            "文件.py",  # Chinese
            "módulo.py",  # Accented characters
            "file with spaces.py",
            "file-with-dashes.py",
            "file_with_underscores.py",
            # Path objects
            Path("file.py"),
            Path("src/module.py"),
        ],
    )
    def test_valid_paths(self, path_input):
        """Test that valid paths are accepted."""
        assert Validate.path(path_input) is True

    @pytest.mark.parametrize(
        "path_input",
        [
            # Excluded directories (exact matches)
            "dist",
            "build",
            "__pycache__",
            "coverage.xml",
            # Paths containing excluded directories
            "dist/bundle.js",
            "build/output/file.py",
            "src/__pycache__/module.cpython-39.pyc",
            "project/build/artifacts/file.py",
            "lib/dist/package/module.py",
            # Lock files (ending with .lock)
            "package.lock",
            "poetry.lock",
            "requirements.lock",
            "Pipfile.lock",
            "yarn.lock",
            "npm.lock",
            "custom.lock",
            # Lock files in nested paths
            "src/package.lock",
            "frontend/yarn.lock",
            "backend/poetry.lock",
            "deep/nested/path/file.lock",
            # Windows-style paths that should be invalid
            "dist\\bundle.js",
            "src\\package.lock",
            # Absolute paths that should be invalid
            "/home/user/project/dist/file.py",
            "/opt/project/package.lock",
            # Unicode with exclusion patterns
            "文件.lock",  # Chinese lock file
            # Path objects
            Path("dist/bundle.js"),
            Path("package.lock"),
        ],
    )
    def test_invalid_paths(self, path_input):
        """Test that invalid paths are rejected."""
        assert Validate.path(path_input) is False


class TestToolsFromDirectory:
    """Test the tools_from_directory skip logic for entrypoint files.

    It has two conditions:
    1. File path match: module_path.resolve() == current_file
    2. Module name match: full_import_path == current_module_name
    """

    @pytest.fixture
    def temp_package(self, tmp_path):
        """Create a temporary package with Python files containing tools."""
        package_dir = tmp_path / "mypackage"
        package_dir.mkdir()

        (package_dir / "__init__.py").write_text("", encoding="utf-8")
        (package_dir / "entrypoint.py").write_text(
            '''
from arcade_mcp_server import tool

@tool
def my_tool():
    """A tool."""
    pass
''',
            encoding="utf-8",
        )
        tools_dir = package_dir / "tools"
        tools_dir.mkdir()
        (tools_dir / "__init__.py").write_text("", encoding="utf-8")
        (tools_dir / "helper.py").write_text(
            '''
from arcade_mcp_server import tool

@tool
def helper_tool():
    """A helper tool."""
    pass
''',
            encoding="utf-8",
        )

        return package_dir

    @patch("arcade_core.toolkit.get_tools_from_file")
    def test_skips_file_when_path_matches(self, mock_get_tools, temp_package):
        """Verify skip when __main__.__file__ matches module path (original behavior)."""
        mock_get_tools.return_value = ["some_tool"]
        entrypoint_path = temp_package / "entrypoint.py"

        # Create mock __main__ module with matching file path
        mock_main = MagicMock()
        mock_main.__file__ = str(entrypoint_path)
        mock_main.__spec__ = None

        with patch.dict("sys.modules", {"__main__": mock_main}):
            result = Toolkit.tools_from_directory(temp_package, "mypackage")

        # entrypoint.py should be skipped, only tools/helper.py should be included
        assert "mypackage.entrypoint" not in result
        assert "mypackage.tools.helper" in result

    @patch("arcade_core.toolkit.get_tools_from_file")
    def test_skips_file_when_module_name_matches(self, mock_get_tools, temp_package):
        """Verify skip when __main__.__spec__.name matches even if paths differ.

        This simulates deployment scenarios where the script runs from a bundle
        but the package is installed in site-packages (different paths).
        """
        mock_get_tools.return_value = ["some_tool"]

        # Create mock __main__ module with different file path but matching module name
        mock_main = MagicMock()
        mock_main.__file__ = "/some/other/path/entrypoint.py"  # Different path
        mock_spec = MagicMock()
        mock_spec.name = "mypackage.entrypoint"  # but, matches the module being scanned
        mock_main.__spec__ = mock_spec

        with patch.dict("sys.modules", {"__main__": mock_main}):
            result = Toolkit.tools_from_directory(temp_package, "mypackage")

        # entrypoint.py should be skipped due to module name match
        assert "mypackage.entrypoint" not in result
        assert "mypackage.tools.helper" in result

    @patch("arcade_core.toolkit.get_tools_from_file")
    def test_no_skip_when_different_module(self, mock_get_tools, temp_package):
        """Verify unrelated modules are not skipped."""
        mock_get_tools.return_value = ["some_tool"]

        # Create mock __main__ module with completely different identity
        mock_main = MagicMock()
        mock_main.__file__ = "/some/other/path/other_script.py"
        mock_spec = MagicMock()
        mock_spec.name = "some_other_package.script"
        mock_main.__spec__ = mock_spec

        with patch.dict("sys.modules", {"__main__": mock_main}):
            result = Toolkit.tools_from_directory(temp_package, "mypackage")

        # Both files should be included since neither matches __main__
        assert "mypackage.entrypoint" in result
        assert "mypackage.tools.helper" in result

    @patch("arcade_core.toolkit.get_tools_from_file")
    def test_no_skip_when_no_main_module(self, mock_get_tools, temp_package):
        """Handle case where __main__ is not in sys.modules."""
        mock_get_tools.return_value = ["some_tool"]

        # Remove __main__ from sys.modules
        with patch.dict("sys.modules", {"__main__": None}):
            result = Toolkit.tools_from_directory(temp_package, "mypackage")

        # Both files should be included
        assert "mypackage.entrypoint" in result
        assert "mypackage.tools.helper" in result

    @patch("arcade_core.toolkit.get_tools_from_file")
    def test_no_skip_when_no_spec(self, mock_get_tools, temp_package):
        """Handle case where __main__ has no __spec__ attribute."""
        mock_get_tools.return_value = ["some_tool"]

        # Create mock __main__ module with different file path and no __spec__
        mock_main = MagicMock()
        mock_main.__file__ = "/some/other/path/script.py"
        mock_main.__spec__ = None

        with patch.dict("sys.modules", {"__main__": mock_main}):
            result = Toolkit.tools_from_directory(temp_package, "mypackage")

        # Both files should be included since path doesn't match and no spec
        assert "mypackage.entrypoint" in result
        assert "mypackage.tools.helper" in result

    @patch("arcade_core.toolkit.get_tools_from_file")
    def test_no_skip_when_spec_has_no_name(self, mock_get_tools, temp_package):
        """Handle case where __main__.__spec__ exists but has no name."""
        mock_get_tools.return_value = ["some_tool"]

        # Create mock __main__ module with __spec__ but no name
        mock_main = MagicMock()
        mock_main.__file__ = "/some/other/path/script.py"
        mock_spec = MagicMock()
        mock_spec.name = None
        mock_main.__spec__ = mock_spec

        with patch.dict("sys.modules", {"__main__": mock_main}):
            result = Toolkit.tools_from_directory(temp_package, "mypackage")

        # Both files should be included
        assert "mypackage.entrypoint" in result
        assert "mypackage.tools.helper" in result
