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using UnityEngine;
using System.Collections;

public class Ocean : MonoBehaviour
{
    // axis enum 
    public enum Axis { X, Y, Z };
    [Header("Animation Parameters")]
    [Tooltip("Axis the deformer to work on")]
    public Axis axis = Axis.Y;
    [Tooltip("Axis the curve will act on")]
    public Axis curveInfluence = Axis.X;
    [Tooltip("Animation Deformation")]
    public AnimationCurve animationCurve;
    [Tooltip("Waves frequency")]
    public float frequency = 0.5f;
    [Tooltip("A way to keep tracking the cycle throught the waves")]
    public float cycle = 1.0f;
    [Tooltip("Waves Height")]
    public float waveHeight = 1.0f;
    [Tooltip("the speed of the waves animation")]
    public float animationSpeed = 10.0f;
    [Tooltip("move through the corresponding axis")]
    public float moveX, moveY, moveZ = 0;
    [Tooltip("Animate the waves")]
    public bool animate = false;
    // private variables
    // array of transform for all the object subjected to the behavior
    Transform[] originalObjects;
    // array of transform for all the object moving
    Transform[] movedObjects;
    // array of the original positions 
    Vector3[] originalObjectsPos;
    // array of the position that changed 
    Vector3[] movedObjectsPos;
    // 
    float normalized;
    float curveValue;
    // setting boundaries for the curve 
    float yMin, yMax, xMin, xMax, zMin, zMax = 0;
    float offsetMin, offsetMax = 0;
    // a new object position 
    Vector3 newObjectPos;
    // array defining the original pos coordinates 
    private float[] OriginalY, OriginalX, OriginalZ;


    void Start()
    {
        // https://docs.unity3d.com/Manual/animeditor-AnimationCurves.html
        // Animation Clip controls how that property changes over time.
        if (animationCurve.length == 0)
        {
            animationCurve = new AnimationCurve(new Keyframe(0, 1), new Keyframe(1, 1));
        }
        // create an array of objects - children of a parent 
        originalObjects = new Transform[transform.childCount];
        // recreated a second array with the previous objects 
        movedObjects = new Transform[originalObjects.Length];
        // respectively created a third array 
        movedObjectsPos = new Vector3[originalObjects.Length];
        // these are the orginal coordinates of the objects 
        OriginalY = new float[originalObjects.Length];
        OriginalX = new float[originalObjects.Length];
        OriginalZ = new float[originalObjects.Length];
        // we created a position array with all the previous coordinates arrays 
        originalObjectsPos = new Vector3[originalObjects.Length];
        // for loop taking in consideration the children list 
        for (int i = 0; i < transform.childCount; i++)
        {
            // assigning values 
            // original objects are all the children transform 
            originalObjects[i] = transform.GetChild(i);
            // moved objects are all the children positions 
            movedObjectsPos[i] = originalObjects[i].position;
            // all of the children positions are the original objects positions 
            originalObjectsPos[i] = originalObjects[i].position;
        }
        // at this stage moved objects are the original objects 
        movedObjects = originalObjects;
        // if the array is not - not exsisting 
        if (originalObjects.Length != 0)
        {
            // fill the following variables 
            // at this stage min=max
            // considering the very first element of the list 
            // as a reference 
            yMin = originalObjects[0].position.y;
            yMax = originalObjects[0].position.y;
            //
            xMin = originalObjects[0].position.x;
            xMax = originalObjects[0].position.x;
            //
            zMin = originalObjects[0].position.z;
            zMax = originalObjects[0].position.z;
        }
        // for loop going through the original objects transform 
        for (int i = 0; i < originalObjects.Length; i++)
        {
            // re assigning the original value 
            OriginalY[i] = originalObjects[i].transform.position.y;
            OriginalX[i] = originalObjects[i].transform.position.x;
            OriginalZ[i] = originalObjects[i].transform.position.z;
            // checking and comparing the values of all the list
            // with the element took into consideration as first 
            // and build the behavior up from there 
            // yMin
            if (originalObjects[i].position.y < yMin)
            {
                yMin = originalObjects[i].position.y;
            }
            // yMax 
            if (originalObjects[i].position.y > yMax)
            {
                yMax = originalObjects[i].position.y;
            }
            // xMin
            if (originalObjects[i].position.x < xMin)
            {
                xMin = originalObjects[i].position.x;
            }
            // xMax
            if (originalObjects[i].position.x > xMax)
            {
                xMax = originalObjects[i].position.x;
            }
            // zMin
            if (originalObjects[i].position.z < zMin)
            {
                zMin = originalObjects[i].position.z;
            }
            // zMax
            if (originalObjects[i].position.z > zMax)
            {
                zMax = originalObjects[i].position.z;
            }
        }
    }
    // considered a fixed update for the steady flow 
    void FixedUpdate()
    {
        TransformSineWave();
        if (animate)
        {
            tickingCycle();
        }
    }
    // 
    public void tickingCycle()
    {
        cycle += Time.deltaTime * animationSpeed;
        // the cycle keeps ticking based on time and speed multiplier 
    }
    void TransformSineWave()
    {
        // based on the values corrisponding on the curve we have 
        // a number of possibilies 
        switch (curveInfluence)
        {
            // the min and max change based on the 
            // enum axis we picked 
            case Axis.X:
                offsetMin = xMin;
                offsetMax = xMax;
                break;

            case Axis.Y:
                offsetMin = yMin;
                offsetMax = yMax;
                break;

            case Axis.Z:
                offsetMin = zMin;
                offsetMax = zMax;
                break;
        }
        // this goes to trigger a condition based of
        // the staring point we set up previously 
        // normalizing a space from 0 to 1
        if (offsetMin == offsetMax)
        {
            offsetMin = 0;
            offsetMax = 1;
        }
        // for all theobjects 
        for (int i = 0; i < originalObjects.Length; i++)
        {
            // this float is the addiction to the position 
            float x, y, z;
            x = originalObjectsPos[i].x + moveX;
            y = originalObjectsPos[i].y + moveY;
            z = originalObjectsPos[i].z + moveZ;
            // locally defined a new variable 
            float new_x = x;
            float new_y = y;
            float new_z = z;
            // based on the axis we chose here is the process of 
            // normalizing the values defining the ratio 
            // for normalizing continuosuly the value 
            // using normalization formula 
            // https://www.wallstreetmojo.com/normalization-formula/
            switch (axis)
            {
                case Axis.X:
                    switch (curveInfluence)
                    {
                        case Axis.X:
                            normalized = (x - offsetMin) / (offsetMax - offsetMin);
                            break;

                        case Axis.Y:
                            normalized = (y - offsetMin) / (offsetMax - offsetMin);
                            break;

                        case Axis.Z:
                            normalized = (z - offsetMin) / (offsetMax - offsetMin);
                            break;
                    }
                    // evaluate 
                    // https://docs.unity3d.com/ScriptReference/AnimationCurve.Evaluate.html
                    // returns float The value of the curve, at the point in time specified.
                    // normalized = The time within the curve you want to evaluate (the horizontal axis in the curve graph).
                    curveValue = animationCurve.Evaluate(normalized);
                    // sinWave formula 
                    // https://answers.unity.com/questions/434717/how-to-make-a-sine-wave-with-a-transform.html
                    // full explanation of the math formula - mecanim could resolve codeless but why not
                    new_x = x + Mathf.Sin(frequency * z + cycle) * waveHeight * curveValue;
                    // wave height multiplies the effect 
                    // z is the opposite parameter on the other axis 
                    // the cicle keeps ticking 
                    // the curve value provide the point of the cycle
                    // is the animation speed is lower the cycle is slower 
                    break;

                case Axis.Y:
                    switch (curveInfluence)
                    {
                        case Axis.X:
                            normalized = (x - offsetMin) / (offsetMax - offsetMin);
                            break;

                        case Axis.Y:
                            normalized = (y - offsetMin) / (offsetMax - offsetMin);
                            break;

                        case Axis.Z:
                            normalized = (z - offsetMin) / (offsetMax - offsetMin);
                            break;
                    }
                    curveValue = animationCurve.Evaluate(normalized);
                    new_y = y + Mathf.Sin(frequency * x + cycle) * waveHeight * curveValue;
                    break;

                case Axis.Z:
                    switch (curveInfluence)
                    {
                        case Axis.X:
                            normalized = (x - offsetMin) / (offsetMax - offsetMin);
                            break;

                        case Axis.Y:
                            normalized = (y - offsetMin) / (offsetMax - offsetMin);
                            break;

                        case Axis.Z:
                            normalized = (z - offsetMin) / (offsetMax - offsetMin);
                            break;
                    }
                    curveValue = animationCurve.Evaluate(normalized);
                    new_z = z + Mathf.Sin(frequency * x + cycle) * waveHeight * curveValue;
                    break;
            }

            // the new values initially defined provide the new current position on frame 
            newObjectPos = new Vector3(new_x, new_y, new_z);
            // we move the object 
            movedObjectsPos[i] = newObjectPos;
        }
        // finally we applied the new defined position of the moved object pos in the transform 
        // transpform.position = vector3 
        for (int x = 0; x < originalObjects.Length; x++)
        {
            movedObjects[x].position = movedObjectsPos[x];
        }
    }
}