"""Unit tests for the config module."""
import unittest
import tempfile
import os
import json
from pathlib import Path

# Add the src directory to the path
import sys
sys.path.insert(0, str(Path(__file__).parent.parent / 'src'))

from forensictrails.utils.config import Config


class TestConfig(unittest.TestCase):
    """Test cases for Config class."""
    
    def setUp(self):
        """Set up test fixtures."""
        self.temp_dir = tempfile.mkdtemp()
        self.test_config_path = os.path.join(self.temp_dir, 'test_config.json')
    
    def tearDown(self):
        """Clean up test fixtures."""
        if os.path.exists(self.test_config_path):
            os.remove(self.test_config_path)
        os.rmdir(self.temp_dir)
    
    def test_config_with_valid_file(self):
        """Test Config loads from valid JSON file."""
        config_data = {
            'database_path': 'custom.db',
            'database_template': 'custom_schema.sql',
            'database_schema_version': 2,
            'log_path': 'custom.log',
            'log_level': 'INFO'
        }
        
        with open(self.test_config_path, 'w') as f:
            json.dump(config_data, f)
        
        config = Config(self.test_config_path)
        
        self.assertEqual(config.database_path, 'custom.db')
        self.assertEqual(config.database_template, 'custom_schema.sql')
        self.assertEqual(config.database_schema_version, 2)
        self.assertEqual(config.log_path, 'custom.log')
        self.assertEqual(config.log_level, 'INFO')
    
    def test_config_with_nonexistent_file(self):
        """Test Config uses defaults when file doesn't exist."""
        config = Config('/nonexistent/config.json')
        
        # Should use default values
        self.assertEqual(config.database_template, 'schema.sql')
        self.assertEqual(config.database_path, 'forensic_trails.db')
        self.assertEqual(config.database_schema_version, 1)
        self.assertEqual(config.log_path, 'forensic_trails.log')
        self.assertEqual(config.log_level, 'DEBUG')
    
    def test_config_with_partial_data(self):
        """Test Config uses defaults for missing keys."""
        config_data = {
            'database_path': 'partial.db',
            'log_level': 'WARNING'
        }
        
        with open(self.test_config_path, 'w') as f:
            json.dump(config_data, f)
        
        config = Config(self.test_config_path)
        
        # Should use provided values
        self.assertEqual(config.database_path, 'partial.db')
        self.assertEqual(config.log_level, 'WARNING')
        
        # Should use defaults for missing keys
        self.assertEqual(config.database_template, 'schema.sql')
        self.assertEqual(config.database_schema_version, 1)
        self.assertEqual(config.log_path, 'forensic_trails.log')
    
    def test_config_with_empty_file(self):
        """Test Config handles empty JSON file."""
        with open(self.test_config_path, 'w') as f:
            json.dump({}, f)
        
        config = Config(self.test_config_path)
        
        # Should use all defaults
        self.assertEqual(config.database_template, 'schema.sql')
        self.assertEqual(config.database_path, 'forensic_trails.db')
        self.assertEqual(config.database_schema_version, 1)
        self.assertEqual(config.log_path, 'forensic_trails.log')
        self.assertEqual(config.log_level, 'DEBUG')
    
    def test_config_with_extra_keys(self):
        """Test Config ignores extra keys in JSON file."""
        config_data = {
            'database_path': 'test.db',
            'extra_key': 'should_be_ignored',
            'another_key': 123
        }
        
        with open(self.test_config_path, 'w') as f:
            json.dump(config_data, f)
        
        config = Config(self.test_config_path)
        
        # Should load valid keys
        self.assertEqual(config.database_path, 'test.db')
        
        # Should not have extra attributes
        self.assertFalse(hasattr(config, 'extra_key'))
        self.assertFalse(hasattr(config, 'another_key'))
    
    def test_config_default_constructor(self):
        """Test Config uses 'config.json' as default filename."""
        # This just tests that it doesn't crash with default parameter
        # The actual config.json file may or may not exist in the project
        try:
            config = Config()
            # Should have all required attributes
            self.assertTrue(hasattr(config, 'database_path'))
            self.assertTrue(hasattr(config, 'database_template'))
            self.assertTrue(hasattr(config, 'database_schema_version'))
            self.assertTrue(hasattr(config, 'log_path'))
            self.assertTrue(hasattr(config, 'log_level'))
        except Exception as e:
            self.fail(f"Config() with default parameter raised exception: {e}")


class TestConfigDataTypes(unittest.TestCase):
    """Test cases for Config data type handling."""
    
    def setUp(self):
        """Set up test fixtures."""
        self.temp_dir = tempfile.mkdtemp()
        self.test_config_path = os.path.join(self.temp_dir, 'test_config.json')
    
    def tearDown(self):
        """Clean up test fixtures."""
        if os.path.exists(self.test_config_path):
            os.remove(self.test_config_path)
        os.rmdir(self.temp_dir)
    
    def test_config_string_values(self):
        """Test Config handles string values correctly."""
        config_data = {
            'database_path': 'test.db',
            'log_level': 'ERROR'
        }
        
        with open(self.test_config_path, 'w') as f:
            json.dump(config_data, f)
        
        config = Config(self.test_config_path)
        
        self.assertIsInstance(config.database_path, str)
        self.assertIsInstance(config.log_level, str)
    
    def test_config_integer_values(self):
        """Test Config handles integer values correctly."""
        config_data = {
            'database_schema_version': 5
        }
        
        with open(self.test_config_path, 'w') as f:
            json.dump(config_data, f)
        
        config = Config(self.test_config_path)
        
        self.assertIsInstance(config.database_schema_version, int)
        self.assertEqual(config.database_schema_version, 5)


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