using PowderCoating.Application.Services;

namespace PowderCoating.UnitTests;

public class MeasurementConversionServiceTests
{
    private readonly MeasurementConversionService _service = new();

    [Fact]
    public void SquareFeetToMeters_AndBack_RoundTripsToCurrencyStylePrecision()
    {
        var squareMeters = _service.SquareFeetToMeters(100m);
        var squareFeet = _service.SquareMetersToFeet(squareMeters);

        Assert.Equal(9.29m, squareMeters);
        Assert.Equal(100m, squareFeet, 1);
    }

    [Fact]
    public void PoundsToKilograms_AndBack_RoundTripsToCurrencyStylePrecision()
    {
        var kilograms = _service.PoundsToKilograms(10m);
        var pounds = _service.KilogramsToPounds(kilograms);

        Assert.Equal(4.54m, kilograms);
        Assert.Equal(10.01m, pounds, 2);
    }

    [Fact]
    public void ConvertArea_WhenImperialToMetric_UsesSquareFeetConversion()
    {
        var result = _service.ConvertArea(50m, fromImperial: true, toMetric: true);

        Assert.Equal(4.65m, result);
    }

    [Fact]
    public void ConvertArea_WhenSourceAndTargetAreSameSystem_ReturnsOriginalValue()
    {
        Assert.Equal(12.34m, _service.ConvertArea(12.34m, fromImperial: true, toMetric: false));
        Assert.Equal(56.78m, _service.ConvertArea(56.78m, fromImperial: false, toMetric: true));
    }

    [Fact]
    public void ConvertWeight_WhenMetricToImperial_UsesKilogramsToPounds()
    {
        var result = _service.ConvertWeight(5m, fromImperial: false, toMetric: false);

        Assert.Equal(11.02m, result);
    }

    [Fact]
    public void UnitLabelHelpers_ReturnExpectedMetricAndImperialLabels()
    {
        Assert.Equal("sq ft", _service.GetAreaUnitLabel(false));
        Assert.Equal("sq m", _service.GetAreaUnitLabel(true));
        Assert.Equal("lb", _service.GetWeightUnitLabel(false));
        Assert.Equal("kg", _service.GetWeightUnitLabel(true));
        Assert.Equal("sq ft/lb", _service.GetCoverageUnitLabel(false));
        Assert.Equal("sq m/kg", _service.GetCoverageUnitLabel(true));
    }
}