"""Tests for fuel-specific pattern matching."""
import pytest

from app.patterns.fuel_patterns import FuelPatternMatcher, fuel_matcher


class TestFuelQuantityExtraction:
    """Test fuel quantity (gallons/liters) extraction."""

    def test_gallons_suffix(self) -> None:
        """Test 'XX.XXX GAL' pattern."""
        text = "10.500 GAL"
        result = fuel_matcher.extract_gallons(text)

        assert result is not None
        assert result.value == 10.5
        assert result.unit == "GAL"
        assert result.confidence > 0.9

    def test_gallons_full_word(self) -> None:
        """Test 'XX.XXX GALLONS' pattern."""
        text = "10.500 GALLONS"
        result = fuel_matcher.extract_gallons(text)

        assert result is not None
        assert result.value == 10.5

    def test_gallons_prefix(self) -> None:
        """Test 'GALLONS: XX.XXX' pattern."""
        text = "GALLONS: 10.500"
        result = fuel_matcher.extract_gallons(text)

        assert result is not None
        assert result.value == 10.5

    def test_gal_prefix(self) -> None:
        """Test 'GAL: XX.XXX' pattern."""
        text = "GAL: 10.500"
        result = fuel_matcher.extract_gallons(text)

        assert result is not None
        assert result.value == 10.5

    def test_volume_label(self) -> None:
        """Test 'VOLUME XX.XXX' pattern."""
        text = "VOLUME: 10.500"
        result = fuel_matcher.extract_gallons(text)

        assert result is not None
        assert result.value == 10.5

    def test_liters_suffix(self) -> None:
        """Test 'XX.XX L' pattern."""
        text = "40.5 L"
        result = fuel_matcher.extract_liters(text)

        assert result is not None
        assert result.value == 40.5
        assert result.unit == "L"

    def test_liters_full_word(self) -> None:
        """Test 'XX.XX LITERS' pattern."""
        text = "40.5 LITERS"
        result = fuel_matcher.extract_liters(text)

        assert result is not None
        assert result.value == 40.5

    def test_quantity_prefers_gallons(self) -> None:
        """Test extract_quantity prefers gallons for US receipts."""
        text = "10.500 GAL"
        result = fuel_matcher.extract_quantity(text)

        assert result is not None
        assert result.unit == "GAL"

    def test_reasonable_quantity_filter(self) -> None:
        """Test unreasonable quantities are filtered."""
        # Too small
        text = "0.001 GAL"
        result = fuel_matcher.extract_gallons(text)
        assert result is None

        # Too large
        text = "100.0 GAL"
        result = fuel_matcher.extract_gallons(text)
        assert result is None


class TestFuelPriceExtraction:
    """Test price per unit extraction."""

    def test_price_per_gal_dollar_sign(self) -> None:
        """Test '$X.XXX/GAL' pattern."""
        text = "$3.679/GAL"
        result = fuel_matcher.extract_price_per_unit(text)

        assert result is not None
        assert result.value == 3.679
        assert result.unit == "GAL"
        assert result.confidence > 0.95

    def test_price_per_gal_no_dollar(self) -> None:
        """Test 'X.XXX/GAL' pattern."""
        text = "3.679/GAL"
        result = fuel_matcher.extract_price_per_unit(text)

        assert result is not None
        assert result.value == 3.679

    def test_labeled_price_gal(self) -> None:
        """Test 'PRICE/GAL $X.XXX' pattern."""
        text = "PRICE/GAL $3.679"
        result = fuel_matcher.extract_price_per_unit(text)

        assert result is not None
        assert result.value == 3.679

    def test_unit_price(self) -> None:
        """Test 'UNIT PRICE $X.XXX' pattern."""
        text = "UNIT PRICE: $3.679"
        result = fuel_matcher.extract_price_per_unit(text)

        assert result is not None
        assert result.value == 3.679

    def test_at_price(self) -> None:
        """Test '@ $X.XXX' pattern."""
        text = "10.500 GAL @ $3.679"
        result = fuel_matcher.extract_price_per_unit(text)

        assert result is not None
        assert result.value == 3.679

    def test_ppg_pattern(self) -> None:
        """Test 'PPG $X.XXX' pattern."""
        text = "PPG: $3.679"
        result = fuel_matcher.extract_price_per_unit(text)

        assert result is not None
        assert result.value == 3.679

    def test_reasonable_price_filter(self) -> None:
        """Test unreasonable prices are filtered."""
        # Too low
        text = "$0.50/GAL"
        result = fuel_matcher.extract_price_per_unit(text)
        assert result is None

        # Too high
        text = "$15.00/GAL"
        result = fuel_matcher.extract_price_per_unit(text)
        assert result is None


class TestFuelGradeExtraction:
    """Test fuel grade/octane extraction."""

    def test_regular_87(self) -> None:
        """Test 'REGULAR 87' pattern."""
        text = "REGULAR 87"
        result = fuel_matcher.extract_grade(text)

        assert result is not None
        assert result.value == "87"
        assert "Regular" in result.display_name

    def test_reg_87(self) -> None:
        """Test 'REG 87' pattern."""
        text = "REG 87"
        result = fuel_matcher.extract_grade(text)

        assert result is not None
        assert result.value == "87"

    def test_unleaded_87(self) -> None:
        """Test 'UNLEADED 87' pattern."""
        text = "UNLEADED 87"
        result = fuel_matcher.extract_grade(text)

        assert result is not None
        assert result.value == "87"

    def test_plus_89(self) -> None:
        """Test 'PLUS 89' pattern."""
        text = "PLUS 89"
        result = fuel_matcher.extract_grade(text)

        assert result is not None
        assert result.value == "89"
        assert "Plus" in result.display_name

    def test_midgrade_89(self) -> None:
        """Test 'MIDGRADE 89' pattern."""
        text = "MIDGRADE 89"
        result = fuel_matcher.extract_grade(text)

        assert result is not None
        assert result.value == "89"

    def test_premium_93(self) -> None:
        """Test 'PREMIUM 93' pattern."""
        text = "PREMIUM 93"
        result = fuel_matcher.extract_grade(text)

        assert result is not None
        assert result.value == "93"
        assert "Premium" in result.display_name

    def test_super_93(self) -> None:
        """Test 'SUPER 93' pattern."""
        text = "SUPER 93"
        result = fuel_matcher.extract_grade(text)

        assert result is not None
        assert result.value == "93"

    def test_diesel(self) -> None:
        """Test 'DIESEL' pattern."""
        text = "DIESEL #2"
        result = fuel_matcher.extract_grade(text)

        assert result is not None
        assert result.value == "DIESEL"
        assert "Diesel" in result.display_name

    def test_e85(self) -> None:
        """Test 'E85' ethanol pattern."""
        text = "E85"
        result = fuel_matcher.extract_grade(text)

        assert result is not None
        assert result.value == "E85"

    def test_octane_only(self) -> None:
        """Test standalone octane number."""
        text = "87 OCTANE"
        result = fuel_matcher.extract_grade(text)

        assert result is not None
        assert result.value == "87"


class TestMerchantExtraction:
    """Test gas station name extraction."""

    def test_shell_station(self) -> None:
        """Test Shell station detection."""
        text = "SHELL\n123 MAIN ST"
        result = fuel_matcher.extract_merchant_name(text)

        assert result is not None
        merchant, confidence = result
        assert "SHELL" in merchant.upper()
        assert confidence > 0.8

    def test_chevron_station(self) -> None:
        """Test Chevron station detection."""
        text = "CHEVRON #12345\n456 OAK AVE"
        result = fuel_matcher.extract_merchant_name(text)

        assert result is not None
        merchant, confidence = result
        assert "CHEVRON" in merchant.upper()

    def test_costco_gas(self) -> None:
        """Test Costco gas detection."""
        text = "COSTCO GASOLINE\n789 WAREHOUSE BLVD"
        result = fuel_matcher.extract_merchant_name(text)

        assert result is not None
        merchant, confidence = result
        assert "COSTCO" in merchant.upper()

    def test_unknown_station_fallback(self) -> None:
        """Test fallback to first line for unknown stations."""
        text = "JOE'S GAS\n123 MAIN ST"
        result = fuel_matcher.extract_merchant_name(text)

        assert result is not None
        merchant, confidence = result
        assert "JOE'S GAS" in merchant
        assert confidence < 0.7  # Lower confidence for unknown


class TestReceiptContextExtraction:
    """Test extraction from realistic receipt text."""

    def test_full_receipt_extraction(self) -> None:
        """Test all fields from complete receipt text."""
        text = """
        SHELL
        123 MAIN STREET
        ANYTOWN, USA 12345

        DATE: 01/15/2024
        TIME: 14:32
        PUMP #5

        REGULAR 87
        10.500 GAL @ $3.679/GAL

        FUEL TOTAL    $38.63
        TAX           $0.00
        TOTAL         $38.63

        DEBIT CARD
        ************1234
        APPROVED
        """

        # Test all extractors on this text
        quantity = fuel_matcher.extract_quantity(text)
        assert quantity is not None
        assert quantity.value == 10.5

        price = fuel_matcher.extract_price_per_unit(text)
        assert price is not None
        assert price.value == 3.679

        grade = fuel_matcher.extract_grade(text)
        assert grade is not None
        assert grade.value == "87"

        merchant = fuel_matcher.extract_merchant_name(text)
        assert merchant is not None
        assert "SHELL" in merchant[0].upper()