using Unity.Mathematics;

namespace ProjectM.Simulation
{
    /// <summary>
    /// Pure, Burst-friendly math for top-down character control, factored out for EditMode unit testing
    /// (no World/system needed). Maps a twin-stick move axis + speed to a planar world velocity.
    /// </summary>
    public static class CharacterControlMath
    {
        /// <summary>
        /// Twin-stick move (x,y) on the XZ plane scaled by <paramref name="speed"/>. Input longer than unit
        /// length is clamped (so diagonals aren't faster than cardinals); shorter is left proportional
        /// (analog sticks). Returns a world velocity with Y == 0.
        /// </summary>
        public static float3 DesiredMovement(float2 move, float speed)
        {
            float lenSq = math.lengthsq(move);
            if (lenSq > 1f)
                move = math.normalize(move);
            return new float3(move.x, 0f, move.y) * speed;
        }
    }
}