namespace HSchool.People;

/// <summary>
/// A country lists climate presets; the school rolls one at birth from the school seed.
/// Reloads without a stored pick take the first listed preset so old saves stay put.
/// </summary>
public static class CountryClimate
{
    public static string? Pick(CountryDef country, int schoolSeed, bool rollIfOmitted)
    {
        ArgumentNullException.ThrowIfNull(country);
        var presets = country.ClimatePresets;
        if (presets.Count == 0)
        {
            return null;
        }

        if (!rollIfOmitted || presets.Count == 1)
        {
            return presets[0];
        }

        var rng = new Random(Seed.ForSchool(schoolSeed, Seed.ClimatePresetSalt));
        return presets[rng.Next(presets.Count)];
    }
}