namespace Game.Blackjack;

/// <summary>
/// Mulberry32 PRNG — a fast, high-quality 32-bit random number generator.
/// Seed is stored in the ECS GameState singleton.
/// </summary>
public static class Mulberry32
{
    /// <summary>
    /// Advances the state and returns a random float in [0, 1).
    /// </summary>
    public static float NextFloat(ref uint state)
    {
        state += 0x6D2B79F5u;
        uint z = state;
        z = (z ^ (z >> 15)) * (z | 1u);
        z ^= z + (z ^ (z >> 7)) * (z | 61u);
        return (z ^ (z >> 14)) / (float)uint.MaxValue;
    }

    /// <summary>
    /// Advances the state and returns a random integer in [min, max].
    /// </summary>
    public static int NextInt(ref uint state, int min, int max)
    {
        return (int)(NextFloat(ref state) * (max - min + 1)) + min;
    }
}