# tests/test_main.py
import pytest
import tempfile
from pathlib import Path
import os
import json
from unittest.mock import patch


def test_basic_functionality():
    """Basic test to ensure pytest is working"""
    assert 1 + 1 == 2


class TestGetModelFolder:
    """Test get_model_folder function"""

    def test_get_model_folder_with_custom_path(self):
        """Test creating model folder with custom path"""
        with tempfile.TemporaryDirectory() as temp_dir:
            test_path = os.path.join(temp_dir, "test_models")

            # Mock the function behavior since we can't import it yet
            # Replace this with actual import when ready:
            # from your_module import get_model_folder
            # result = get_model_folder(test_path)

            # For now, simulate the expected behavior
            result_path = Path(test_path)
            os.makedirs(result_path, exist_ok=True)

            assert result_path.exists()
            assert result_path.is_dir()

    @patch("pathlib.Path.home")
    def test_get_model_folder_default_path(self, mock_home):
        """Test default model folder creation"""
        mock_home.return_value = Path("/fake/home")

        # This test will work once you import the actual function
        # For now it's just a placeholder
        expected_path = Path("/fake/home/model")

        # When you import the function, replace this with:
        # result = get_model_folder()
        # assert result == expected_path
        assert expected_path == Path("/fake/home/model")


class TestFileValidation:
    """Test file validation logic"""

    def test_file_exists_validation(self):
        """Test file existence validation"""
        with tempfile.TemporaryDirectory() as temp_dir:
            # Create a real file
            test_file = Path(temp_dir) / "test_file.parquet"
            test_file.touch()

            # Test file exists
            assert test_file.exists()

            # Test non-existent file
            non_existent = Path(temp_dir) / "does_not_exist.parquet"
            assert not non_existent.exists()

    def test_directory_creation(self):
        """Test directory creation logic"""
        with tempfile.TemporaryDirectory() as temp_dir:
            new_dir = Path(temp_dir) / "new_directory"

            # Directory doesn't exist initially
            assert not new_dir.exists()

            # Create directory
            os.makedirs(new_dir, exist_ok=True)

            # Now it should exist
            assert new_dir.exists()
            assert new_dir.is_dir()


class TestJSONConfig:
    """Test JSON configuration handling"""

    def test_json_config_creation(self):
        """Test creating training configuration JSON"""
        with tempfile.TemporaryDirectory() as temp_dir:
            config_file = Path(temp_dir) / "training_config.json"

            config_data = {
                "train_column": "ECFP6",
                "label": "LABEL",
                "fingerprint_type": "ECFP6",
                "model_directory": str(temp_dir),
            }

            # Write config file
            with open(config_file, "w") as f:
                json.dump(config_data, f, indent=2)

            # Verify file was created
            assert config_file.exists()

            # Read and verify content
            with open(config_file, "r") as f:
                loaded_config = json.load(f)

            assert loaded_config["train_column"] == "ECFP6"
            assert loaded_config["label"] == "LABEL"

    def test_json_config_validation(self):
        """Test JSON configuration validation"""
        with tempfile.TemporaryDirectory() as temp_dir:
            config_file = Path(temp_dir) / "training_config.json"

            # Test with valid config
            valid_config = {"train_column": "ECFP6", "fingerprint_type": "ECFP6"}
            with open(config_file, "w") as f:
                json.dump(valid_config, f)

            # This simulates the validation logic from your screen_compound function
            with open(config_file, "r") as f:
                loaded_config = json.load(f)

            expected_fingerprint = loaded_config.get("fingerprint_type")
            provided_fingerprint = "ECFP6"

            # Should not raise error when they match
            assert expected_fingerprint == provided_fingerprint

            # Should detect mismatch
            wrong_fingerprint = "ECFP4"
            assert expected_fingerprint != wrong_fingerprint


class TestPathHandling:
    """Test path handling logic"""

    def test_path_conversion(self):
        """Test converting strings to Path objects"""
        string_path = "/some/path/to/file.txt"
        path_obj = Path(string_path)

        assert isinstance(path_obj, Path)
        assert str(path_obj) == string_path

    def test_path_operations(self):
        """Test common path operations"""
        with tempfile.TemporaryDirectory() as temp_dir:
            base_path = Path(temp_dir)

            # Test path joining
            file_path = base_path / "subdir" / "file.txt"
            assert "subdir" in str(file_path)
            assert "file.txt" in str(file_path)

            # Test parent directory
            assert file_path.parent == base_path / "subdir"

            # Test file creation
            file_path.parent.mkdir(parents=True, exist_ok=True)
            file_path.touch()
            assert file_path.exists()


class TestErrorHandling:
    """Test error handling patterns"""

    def test_file_not_found_error(self):
        """Test FileNotFoundError scenarios"""
        non_existent_file = Path("/this/does/not/exist.txt")

        # This simulates the error checking in your main function
        if not non_existent_file.exists():
            with pytest.raises(FileNotFoundError):
                raise FileNotFoundError(f"Training file not found: {non_existent_file}")

    def test_value_error_for_missing_columns(self):
        """Test ValueError for missing columns"""
        available_columns = ["col1", "col2", "col3"]
        required_column = "missing_column"

        # This simulates the column validation in your main function
        if required_column not in available_columns:
            with pytest.raises(ValueError):
                raise ValueError(f"Column {required_column} not found. Available columns: {available_columns}")


@pytest.fixture
def temp_model_dir():
    """Fixture providing a temporary model directory"""
    with tempfile.TemporaryDirectory() as temp_dir:
        model_dir = Path(temp_dir) / "models"
        model_dir.mkdir()
        yield model_dir


@pytest.fixture
def sample_config():
    """Fixture providing sample configuration data"""
    return {"train_column": "ECFP6", "label": "LABEL", "fingerprint_type": "ECFP6"}


def test_with_fixtures(temp_model_dir, sample_config):
    """Test using pytest fixtures"""
    # Create config file in temp directory
    config_file = temp_model_dir / "config.json"
    with open(config_file, "w") as f:
        json.dump(sample_config, f)

    # Verify setup
    assert config_file.exists()
    assert temp_model_dir.exists()
    assert sample_config["train_column"] == "ECFP6"


class TestMockingExamples:
    """Examples of how to mock external dependencies"""

    @patch("builtins.print")
    def test_print_mocking(self, mock_print):
        """Test mocking print statements"""
        test_message = "Hello, World!"
        print(test_message)
        mock_print.assert_called_once_with(test_message)

    @patch("pathlib.Path.glob")
    def test_glob_mocking(self, mock_glob):
        """Test mocking file globbing"""
        mock_glob.return_value = [Path("model1.pkl"), Path("model2.pkl")]

        # This simulates the model file discovery logic
        model_files = Path("/fake/dir").glob("*.pkl")
        model_list = list(model_files)

        assert len(model_list) == 2
        mock_glob.assert_called_once_with("*.pkl")


# Simple integration test
def test_integration_example():
    """Example of a simple integration test"""
    with tempfile.TemporaryDirectory() as temp_dir:
        # Setup: create directory structure
        model_dir = Path(temp_dir) / "models"
        model_dir.mkdir()

        # Setup: create some files
        (model_dir / "model1.pkl").touch()
        (model_dir / "model2.pkl").touch()

        # Test: verify setup
        pkl_files = list(model_dir.glob("*.pkl"))
        assert len(pkl_files) == 2

        # Test: verify file names
        file_names = [f.name for f in pkl_files]
        assert "model1.pkl" in file_names
        assert "model2.pkl" in file_names


if __name__ == "__main__":
    # Run tests with: python -m pytest tests/test_main.py -v
    print("Run with: python -m pytest tests/test_main.py -v")
