PKHeX/PKHeX.Core/Legality/Verifiers/ConsoleRegionVerifier.cs

using static PKHeX.Core.LegalityCheckResultCode;

namespace PKHeX.Core;

/// <summary>
/// Verifies the <see cref="IRegionOrigin.ConsoleRegion"/> and <see cref="IRegionOrigin.Country"/> of origin values.
/// </summary>
public sealed class ConsoleRegionVerifier : Verifier
{
    protected override CheckIdentifier Identifier => CheckIdentifier.Geography;

    public override void Verify(LegalityAnalysis data)
    {
        if (data.Entity is not IRegionOrigin tr)
            return;
        var result = VerifyConsoleRegion(tr);
        data.AddLine(result);
    }

    /// <summary>
    /// Verifies that the region data maps to one of the <see cref="Region3DSIndex"/> values, and that the country is valid for that region.
    /// </summary>
    private CheckResult VerifyConsoleRegion(IRegionOrigin pk)
    {
        var consoleRegion = pk.ConsoleRegion;
        if (consoleRegion >= 7)
            return GetInvalid(GeoHardwareRange);

        return Verify3DSDataPresent(pk, consoleRegion);
    }

    private CheckResult Verify3DSDataPresent(IRegionOrigin pk, byte consoleRegion)
    {
        if (!Locale3DS.IsConsoleRegionCountryValid(consoleRegion, pk.Country))
            return GetInvalid(GeoHardwareInvalid);
        return GetValid(GeoHardwareValid);
    }
}