using UnityEngine;

namespace UnityEditor.VFX.Operator
{
    [VFXHelpURL("Operator-Remap(-11)")]
    [VFXInfo(name = "Remap [0..1] => [-1..1]", category = "Math/Remap")]
    class RemapToNegOnePosOne : VFXOperatorNumericUniform
    {
        [VFXSetting, SerializeField, Tooltip("When enabled, the input value is clamped between 0 and 1.")]
        private bool m_Clamp = false;

        public class InputProperties
        {
            [Tooltip("Sets the value to be remapped into the [-1..1] range. If the input value is not clamped, the remapped value can go beyond that range.")]
            public float input = 0.5f;
        }

        protected override sealed string operatorName { get { return "Remap [0..1] => [-1..1]"; } }

        protected override sealed VFXExpression[] BuildExpression(VFXExpression[] inputExpression)
        {
            var type = inputExpression[0].valueType;

            VFXExpression input;
            if (m_Clamp)
                input = VFXOperatorUtility.Saturate(inputExpression[0]);
            else
                input = inputExpression[0];

            return new[] { VFXOperatorUtility.Mad(input, VFXOperatorUtility.TwoExpression[type], VFXOperatorUtility.Negate(VFXOperatorUtility.OneExpression[type])) };
        }

        protected sealed override ValidTypeRule typeFilter
        {
            get
            {
                return ValidTypeRule.allowEverythingExceptInteger;
            }
        }
    }
}