import unittest
import cv2
import numpy as np
from PIL import Image
import os
from typing import Dict, Any, Optional, TypedDict, List, Tuple, cast
from src.utils.barcode import Barcode

class BarcodeResult(TypedDict):
    type: str
    data: str
    valid: bool

class TestBarcode(unittest.TestCase):
    def setUp(self):
        self.barcode = Barcode()
        # Create test directory if it doesn't exist
        self.test_dir = os.path.dirname(os.path.abspath(__file__))
        self.test_images_dir = os.path.join(self.test_dir, 'test_images')
        os.makedirs(self.test_images_dir, exist_ok=True)

    def test_validate_barcode(self):
        """Test barcode validation for different formats"""
        # Test valid EAN-13
        self.assertTrue(self.barcode.validate_barcode('5901234123457', 'EAN13'))
        
        # Test invalid EAN-13
        self.assertFalse(self.barcode.validate_barcode('5901234123458', 'EAN13'))
        
        # Test valid EAN-8
        self.assertTrue(self.barcode.validate_barcode('40170725', 'EAN8'))
        
        # Test invalid EAN-8
        self.assertFalse(self.barcode.validate_barcode('40170726', 'EAN8'))

        # Test valid UPC-A
        self.assertTrue(self.barcode.validate_barcode('042100005264', 'UPCA'))
        
        # Test invalid UPC-A
        self.assertFalse(self.barcode.validate_barcode('042100005265', 'UPCA'))

    def test_scan_and_validate_from_pil(self):
        """Test barcode scanning from PIL Image"""
        # Create a simple test image with a barcode
        # This is a placeholder - you should replace with actual barcode images
        test_image_path = os.path.join(self.test_images_dir, 'test_barcode.png')
        if not os.path.exists(test_image_path):
            # Create a blank image if test image doesn't exist
            img = Image.new('RGB', (400, 200), color='white')
            img.save(test_image_path)
        
        # Load test image
        image = Image.open(test_image_path)
        
        # Test scanning
        results = self.barcode.scan_and_validate(image)
        
        # Basic structure test
        self.assertIsInstance(results, list)
        
        # If a barcode is found, verify the result structure
        for result in results:
            typed_result = cast(BarcodeResult, result)
            self.assertIsInstance(result, dict)
            self.assertTrue(all(key in result for key in ['type', 'data', 'valid']))
            self.assertIsInstance(typed_result['type'], str)
            self.assertIsInstance(typed_result['data'], str)
            self.assertIsInstance(typed_result['valid'], bool)

    def test_scan_and_validate_from_cv2(self):
        """Test barcode scanning from OpenCV image"""
        # Create a test image using OpenCV
        test_image_path = os.path.join(self.test_images_dir, 'test_barcode_cv2.png')
        if not os.path.exists(test_image_path):
            # Create a blank image if test image doesn't exist
            img = np.full((200, 400, 3), 255, dtype=np.uint8)  # White background
            cv2.imwrite(test_image_path, img)
        
        # Load test image
        image = cv2.imread(test_image_path)
        
        # Test scanning with show_image=True
        scan_result = self.barcode.scan_and_validate(image, show_image=True)
        self.assertIsInstance(scan_result, tuple)
        results, annotated_image = scan_result
        
        # Verify results
        self.assertIsInstance(results, list)
        self.assertIsInstance(annotated_image, np.ndarray)
        
        # Check if the annotated image has the same dimensions as input
        self.assertEqual(annotated_image.shape, image.shape)

    def test_error_handling(self):
        """Test error handling for invalid inputs"""
        # Test with None - should raise an exception
        with self.assertRaises(Exception):
            self.barcode.scan_and_validate(None)  # type: ignore
        
        # Test with invalid image type - should raise an exception
        with self.assertRaises(Exception):
            self.barcode.scan_and_validate("not an image")  # type: ignore
        
        # Test empty strings are always invalid
        self.assertFalse(self.barcode.validate_barcode("", "EAN13"))
        self.assertFalse(self.barcode.validate_barcode("", "UNKNOWN"))
        
        # Test validation with unknown format
        # For unknown formats, we validate against known formats first
        self.assertFalse(self.barcode.validate_barcode("invalid", "UNKNOWN"))  # Invalid data structure
        self.assertFalse(self.barcode.validate_barcode("12345678", "UNKNOWN"))  # Valid structure but not a valid barcode
        self.assertTrue(self.barcode.validate_barcode("5901234123457", "UNKNOWN"))  # Valid EAN13 structure

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