# tests/test_utils.py (Enhanced version of your existing file)
import pytest
from utils.data_processing import GTINProcessor, PriceProcessor


class TestGTINProcessor:
    def setup_method(self):
        self.processor = GTINProcessor()

    def test_normalize_valid_gtin(self):
        """Test GTIN normalization with valid inputs"""
        # Test EAN-13
        assert self.processor.normalize("1234567890123") == "1234567890123"

        # Test UPC-A (12 digits)
        assert self.processor.normalize("123456789012") == "123456789012"

        # Test with decimal point
        assert self.processor.normalize("123456789012.0") == "123456789012"

        # Test EAN-8
        assert self.processor.normalize("12345678") == "12345678"

    def test_normalize_invalid_gtin(self):
        """Test GTIN normalization with invalid inputs"""
        assert self.processor.normalize("") is None
        assert self.processor.normalize(None) is None
        assert self.processor.normalize("abc") is None

        # Test short number (gets padded)
        assert self.processor.normalize("123") == "000000000123"

    def test_normalize_gtin_with_formatting(self):
        """Test GTIN normalization with various formatting"""
        # Test with spaces
        assert self.processor.normalize("123 456 789 012") == "123456789012"

        # Test with dashes
        assert self.processor.normalize("123-456-789-012") == "123456789012"

        # Test with mixed formatting
        assert self.processor.normalize("123 456-789 012") == "123456789012"

    def test_validate_gtin(self):
        """Test GTIN validation"""
        assert self.processor.validate("1234567890123") is True
        assert self.processor.validate("123456789012") is True
        assert self.processor.validate("12345678") is True
        assert self.processor.validate("123") is False
        assert self.processor.validate("") is False
        assert self.processor.validate(None) is False

    def test_gtin_checksum_validation(self):
        """Test GTIN checksum validation if implemented"""
        # This test would verify checksum calculation if your GTINProcessor implements it
        # For now, we'll test the structure validation
        assert self.processor.validate("1234567890123") is True
        assert self.processor.validate("12345678901234") is True  # 14 digits
        assert self.processor.validate("123456789012345") is False  # 15 digits


class TestPriceProcessor:
    def setup_method(self):
        self.processor = PriceProcessor()

    def test_parse_price_currency_eur(self):
        """Test EUR price parsing"""
        price, currency = self.processor.parse_price_currency("8.26 EUR")
        assert price == "8.26"
        assert currency == "EUR"

        # Test with euro symbol
        price, currency = self.processor.parse_price_currency("8.26 €")
        assert price == "8.26"
        assert currency == "EUR"

    def test_parse_price_currency_usd(self):
        """Test USD price parsing"""
        price, currency = self.processor.parse_price_currency("$12.50")
        assert price == "12.50"
        assert currency == "USD"

        price, currency = self.processor.parse_price_currency("12.50 USD")
        assert price == "12.50"
        assert currency == "USD"

    def test_parse_price_currency_comma_decimal(self):
        """Test price parsing with comma as decimal separator"""
        price, currency = self.processor.parse_price_currency("8,26 EUR")
        assert price == "8.26"
        assert currency == "EUR"

    def test_parse_invalid_price(self):
        """Test invalid price parsing"""
        price, currency = self.processor.parse_price_currency("")
        assert price is None
        assert currency is None

        price, currency = self.processor.parse_price_currency(None)
        assert price is None
        assert currency is None

    def test_parse_price_edge_cases(self):
        """Test edge cases in price parsing"""
        # Test price without currency
        price, currency = self.processor.parse_price_currency("15.99")
        assert price == "15.99"
        # currency might be None or default value

        # Test currency before price
        price, currency = self.processor.parse_price_currency("EUR 25.50")
        assert price == "25.50"
        assert currency == "EUR"

        # Test with multiple decimal places
        price, currency = self.processor.parse_price_currency("12.999 USD")
        assert price == "12.999"
        assert currency == "USD"