using UnityEngine;
using System.Collections;

using UnityEngine.Experimental.Director;
using System.Collections.Generic;

public class AnimationController : MonoBehaviour
{

    Animator animator;
    PlayableGraph graph;
    PlayableHandle mixer;
    int curInputIndex = -1;
    private void Awake()
    {

        animator = GetComponent<Animator>();

        graph = PlayableGraph.CreateGraph();

        mixer = graph.CreateGenericMixerPlayable(3);
        AnimationPlayableUtilities.Play(animator, mixer, graph);
    }

    private void OnDestroy()
    {
        graph.Destroy();
    }
    bool hadInit = false;
    public void Play(string animationName)
    {
        Debug.Log("Play " + animationName);
        var clip = AnimationStore.Instance.GetAnimation(animationName);
        PlayableHandle handle;

        if(clip == null)
        {
            var controller = AnimationStore.Instance.GetController(animationName);
            handle = graph.CreateAnimatorControllerPlayable(controller);
        }
        else
        {
            handle = graph.CreateAnimationClipPlayable(clip);
        }
        curInputIndex++;
        if (curInputIndex == mixer.inputCount)
            curInputIndex = 0;
        if(mixer.GetInput(curInputIndex) != PlayableHandle.Null)
        {
            var input = mixer.GetInput(curInputIndex);
            graph.Disconnect(mixer, curInputIndex);
            input.Destroy();
        }
        graph.Connect(handle, 0, mixer, curInputIndex);
        if(hadInit)
        {

            mixer.SetInputWeight(curInputIndex, 0f);
        }
        else
        {
            mixer.SetInputWeight(curInputIndex, 1f);
            hadInit = true;
        }

    }
    float fadeSpeed = 0.001f;
    private void Update()
    {
        float totalWeight = 0f;
        for (int i = 0; i < mixer.inputCount; i++)
        {
            if (i == curInputIndex)
            {
                var w = mixer.GetInputWeight(i) + fadeSpeed;
                if (w >= 1f)
                    w = 1f;
                mixer.SetInputWeight(i, w);
                totalWeight += w;
            }
            else
            {
                var w = mixer.GetInputWeight(i) - fadeSpeed;
                if (w < fadeSpeed * 2)
                    w = 0f;
                mixer.SetInputWeight(i, w);
                totalWeight += w;

            }
        }
        if(totalWeight != 0f)
        for (int i = 0; i < mixer.inputCount; i++)
        {
            var w = mixer.GetInputWeight(i) / totalWeight;
            if (w < 0f)
                w = 0f;
            else if (w > 1f)
                w = 1f;
            mixer.SetInputWeight(i, w);
        }

        }

    private void OnGUI()
    {
        GraphVisualizerClient.Show(mixer.GetObject(), gameObject.name);
    }

}