using T3.Core.Animation;
using T3.Core.Utils;
using static T3.Core.Utils.EasingFunctions;

namespace Lib.numbers.@vec3.process;
[Guid("12dccab1-1d7d-4005-a4c1-0bebeeaeb6d3")]
internal sealed class EaseVec3 : Instance<EaseVec3>
{
    [Output(Guid = "b54d5398-3671-44b7-961f-0fb092a2c78b", DirtyFlagTrigger = DirtyFlagTrigger.Animated)]
    public readonly Slot<Vector3> Result = new();

    private const float MinTimeElapsedBeforeEvaluation = 1 / 1000f;

    public EaseVec3()
    {
        Result.UpdateAction = Update;
    }

    private void Update(EvaluationContext context)
    {
        var inputValue = Value.GetValue(context);  // Target value (0 or 1)
        var duration = Duration.GetValue(context); // Duration of the animation in seconds
        if (duration == 0)
            duration = 0.0001f;

        var easeMode = Interpolation.GetEnumValue<Interpolations>(context);     // Easing function selector
        var easeDirection = Direction.GetEnumValue<EaseDirection>(context);


        var currentTime = UseAppRunTime.GetValue(context) ? Playback.RunTimeInSecs : context.LocalFxTime;
        if (Math.Abs(currentTime - _lastEvalTime) < MinTimeElapsedBeforeEvaluation)
            return;

        if (context.IntVariables.TryGetValue("__MotionBlurPass", out var motionBlurPass) && motionBlurPass > 0)
        {
            return;
        }

        _lastEvalTime = currentTime;

        if (Vector3.Distance(inputValue, _previousInputValue) > 0.001f)
        {
            _startTime = currentTime;
            _initialValue = Result.Value;
            _targetValue = inputValue;
        }

        // Calculate progress based on elapsed time and duration
        var elapsedTime = (float)(currentTime - _startTime);
        var progress = Math.Clamp(elapsedTime / duration, 0f, 1f);

        // Apply selected easing function based on easeMode
        //var easedProgress = progress;
        var easedProgress = EasingFunctions.ApplyEasing(progress, easeDirection, easeMode);

        Result.Value = new Vector3(
                        MathUtils.Lerp(_initialValue.X, _targetValue.X, easedProgress),
                        MathUtils.Lerp(_initialValue.Y, _targetValue.Y, easedProgress),
                        MathUtils.Lerp(_initialValue.Z, _targetValue.Z, easedProgress)
            );


        _previousInputValue = inputValue;
    }

    private double _lastEvalTime;
    private double _startTime;
    private Vector3 _initialValue;
    private Vector3 _targetValue;
    private Vector3 _previousInputValue;

    [Input(Guid = "16e48eb8-3baf-4e0b-a75e-72a747c9fead")]
    public readonly InputSlot<System.Numerics.Vector3> Value = new InputSlot<System.Numerics.Vector3>();

    [Input(Guid = "c7ebf4ed-5477-4461-ac68-8a7ac9849ce6")]
    public readonly InputSlot<float> Duration = new InputSlot<float>();

    [Input(Guid = "2a450207-489e-4a8d-83ab-37ed8167eebe")]
    public readonly InputSlot<bool> UseAppRunTime = new InputSlot<bool>();

    [Input(Guid = "1867ff18-f510-4c84-a3be-a4123e878133", MappedType = typeof(EaseDirection))]
    public readonly InputSlot<int> Direction = new InputSlot<int>();

    [Input(Guid = "9ef45ff9-9d59-44b7-b03d-37a1be40a776", MappedType = typeof(Interpolations))]
    public readonly InputSlot<int> Interpolation = new InputSlot<int>();

}