"""
Test script for VisualizationAgent initialization (Task 3)
Tests Requirements: 2.1, 3.1, 3.2
"""
import os
import sys
import tempfile
import shutil
from pathlib import Path

# Add parent directory to path for imports
sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), '..'))

from agent import VisualizationAgent


def test_initialization_with_api_key():
    """Test initialization with explicit API key"""
    print("\n=== Test 1: Initialization with explicit API key ===")
    try:
        agent = VisualizationAgent(api_key="test_api_key_123")
        assert agent.api_key == "test_api_key_123", "API key not set correctly"
        assert agent.client is not None, "Client not initialized"
        assert agent.model == "gemini-2.5-flash-image", "Default model not set correctly"
        assert agent.output_dir == "./generated_images", "Default output_dir not set correctly"
        print("✓ Initialization with explicit API key successful")
        return True
    except Exception as e:
        print(f"✗ Test failed: {e}")
        return False


def test_initialization_from_env_gemini():
    """Test initialization from GEMINI_API_KEY environment variable"""
    print("\n=== Test 2: Initialization from GEMINI_API_KEY ===")
    try:
        # Set environment variable
        os.environ["GEMINI_API_KEY"] = "env_gemini_key_456"
        
        agent = VisualizationAgent()
        assert agent.api_key == "env_gemini_key_456", "API key not read from GEMINI_API_KEY"
        assert agent.client is not None, "Client not initialized"
        print("✓ Initialization from GEMINI_API_KEY successful")
        
        # Clean up
        del os.environ["GEMINI_API_KEY"]
        return True
    except Exception as e:
        print(f"✗ Test failed: {e}")
        if "GEMINI_API_KEY" in os.environ:
            del os.environ["GEMINI_API_KEY"]
        return False


def test_initialization_from_env_google():
    """Test initialization from GOOGLE_API_KEY environment variable"""
    print("\n=== Test 3: Initialization from GOOGLE_API_KEY ===")
    try:
        # Set environment variable
        os.environ["GOOGLE_API_KEY"] = "env_google_key_789"
        
        agent = VisualizationAgent()
        assert agent.api_key == "env_google_key_789", "API key not read from GOOGLE_API_KEY"
        assert agent.client is not None, "Client not initialized"
        print("✓ Initialization from GOOGLE_API_KEY successful")
        
        # Clean up
        del os.environ["GOOGLE_API_KEY"]
        return True
    except Exception as e:
        print(f"✗ Test failed: {e}")
        if "GOOGLE_API_KEY" in os.environ:
            del os.environ["GOOGLE_API_KEY"]
        return False


def test_initialization_no_api_key():
    """Test that initialization fails without API key"""
    print("\n=== Test 4: Initialization without API key (should fail) ===")
    try:
        # Clear environment variables
        gemini_key = os.environ.pop("GEMINI_API_KEY", None)
        google_key = os.environ.pop("GOOGLE_API_KEY", None)
        
        try:
            agent = VisualizationAgent()
            print("✗ Should have raised ValueError for missing API key")
            return False
        except ValueError as e:
            assert "API key is required" in str(e), f"Wrong error message: {e}"
            print("✓ Correctly raises ValueError when API key is missing")
            return True
        finally:
            # Restore environment variables
            if gemini_key:
                os.environ["GEMINI_API_KEY"] = gemini_key
            if google_key:
                os.environ["GOOGLE_API_KEY"] = google_key
    except Exception as e:
        print(f"✗ Test failed: {e}")
        return False


def test_custom_model():
    """Test initialization with custom model"""
    print("\n=== Test 5: Initialization with custom model ===")
    try:
        agent = VisualizationAgent(
            api_key="test_key",
            model="gemini-3-pro-image-preview"
        )
        assert agent.model == "gemini-3-pro-image-preview", "Custom model not set correctly"
        print("✓ Custom model set successfully")
        return True
    except Exception as e:
        print(f"✗ Test failed: {e}")
        return False


def test_default_model():
    """Test that default model is gemini-2.5-flash-image"""
    print("\n=== Test 6: Default model is gemini-2.5-flash-image ===")
    try:
        agent = VisualizationAgent(api_key="test_key")
        assert agent.model == "gemini-2.5-flash-image", f"Default model should be gemini-2.5-flash-image, got {agent.model}"
        print("✓ Default model is gemini-2.5-flash-image")
        return True
    except Exception as e:
        print(f"✗ Test failed: {e}")
        return False


def test_custom_output_dir():
    """Test initialization with custom output directory"""
    print("\n=== Test 7: Initialization with custom output directory ===")
    try:
        # Use a temporary directory
        temp_dir = tempfile.mkdtemp()
        custom_dir = os.path.join(temp_dir, "custom_output")
        
        agent = VisualizationAgent(
            api_key="test_key",
            output_dir=custom_dir
        )
        assert agent.output_dir == custom_dir, "Custom output_dir not set correctly"
        assert os.path.exists(custom_dir), "Output directory was not created"
        assert os.path.isdir(custom_dir), "Output directory is not a directory"
        print("✓ Custom output directory set and created successfully")
        
        # Clean up
        shutil.rmtree(temp_dir)
        return True
    except Exception as e:
        print(f"✗ Test failed: {e}")
        return False


def test_default_output_dir():
    """Test that default output directory is ./generated_images"""
    print("\n=== Test 8: Default output directory ===")
    try:
        agent = VisualizationAgent(api_key="test_key")
        assert agent.output_dir == "./generated_images", f"Default output_dir should be ./generated_images, got {agent.output_dir}"
        print("✓ Default output directory is ./generated_images")
        return True
    except Exception as e:
        print(f"✗ Test failed: {e}")
        return False


def test_output_dir_creation():
    """Test that output directory is created if it doesn't exist"""
    print("\n=== Test 9: Output directory creation ===")
    try:
        # Use a temporary directory that doesn't exist yet
        temp_dir = tempfile.mkdtemp()
        test_dir = os.path.join(temp_dir, "test_output", "nested", "dir")
        
        # Ensure it doesn't exist
        assert not os.path.exists(test_dir), "Test directory should not exist yet"
        
        agent = VisualizationAgent(
            api_key="test_key",
            output_dir=test_dir
        )
        
        assert os.path.exists(test_dir), "Output directory was not created"
        assert os.path.isdir(test_dir), "Output directory is not a directory"
        print("✓ Output directory created successfully (including nested directories)")
        
        # Clean up
        shutil.rmtree(temp_dir)
        return True
    except Exception as e:
        print(f"✗ Test failed: {e}")
        return False


def test_client_initialization():
    """Test that genai.Client is properly initialized"""
    print("\n=== Test 10: genai.Client initialization ===")
    try:
        agent = VisualizationAgent(api_key="test_key_abc")
        assert agent.client is not None, "Client should not be None"
        assert hasattr(agent.client, 'models'), "Client should have 'models' attribute"
        print("✓ genai.Client initialized correctly")
        return True
    except Exception as e:
        print(f"✗ Test failed: {e}")
        return False


if __name__ == "__main__":
    print("=" * 70)
    print("VisualizationAgent Initialization Tests (Task 3)")
    print("Testing Requirements: 2.1, 3.1, 3.2")
    print("=" * 70)
    
    # Run all tests
    test_results = []
    test_results.append(("Explicit API key", test_initialization_with_api_key()))
    test_results.append(("GEMINI_API_KEY env var", test_initialization_from_env_gemini()))
    test_results.append(("GOOGLE_API_KEY env var", test_initialization_from_env_google()))
    test_results.append(("Missing API key (should fail)", test_initialization_no_api_key()))
    test_results.append(("Custom model", test_custom_model()))
    test_results.append(("Default model", test_default_model()))
    test_results.append(("Custom output directory", test_custom_output_dir()))
    test_results.append(("Default output directory", test_default_output_dir()))
    test_results.append(("Output directory creation", test_output_dir_creation()))
    test_results.append(("genai.Client initialization", test_client_initialization()))
    
    # Summary
    print("\n" + "=" * 70)
    print("TEST SUMMARY")
    print("=" * 70)
    
    passed = sum(1 for _, result in test_results if result)
    total = len(test_results)
    
    for test_name, result in test_results:
        status = "✅ PASS" if result else "❌ FAIL"
        print(f"  {status}: {test_name}")
    
    print(f"\n{'=' * 70}")
    print(f"Total: {passed}/{total} tests passed")
    print("=" * 70)
    
    # Exit with appropriate code
    if passed == total:
        print("\n✅ All initialization tests passed!")
        sys.exit(0)
    else:
        print(f"\n❌ {total - passed} test(s) failed")
        sys.exit(1)