using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Sticker : MonoBehaviour {

    public Transform stickOne;
    public Transform stickTwo;

    new public LineRenderer renderer;

    public float MovementSpeed;

    public float Frequency = 1f;
    public float Amplitude = 0.2f;

    public float SineLerpPower = 1.65f;
    public float SineSpeed = 6f;

    void Start() {
        renderer = GetComponent<LineRenderer>();

        renderer.numPositions = 100;
    }

    float mapRange( float value, float low1, float high1, float low2, float high2 ) {
        return low2 + ( high2 - low2 ) * ( value - low1 ) / ( high1 - low1 );
    }

    void Update() {
        var h1 = Input.GetAxis( "Horizontal" );
        var h2 = Input.GetAxis( "Horizontal2" );

        var v1 = Input.GetAxis( "Vertical" );
        var v2 = Input.GetAxis( "Vertical2" );


        stickOne.transform.position += new Vector3( h1, v1 ) * MovementSpeed * Time.deltaTime;
        stickTwo.transform.position += new Vector3( h2, v2 ) * MovementSpeed * Time.deltaTime;



        var diff = stickTwo.position - stickOne.position;
        var middle = stickOne.transform.position + diff / 2f;
        var maxDist = diff.magnitude;

        var freq = mapRange( diff.magnitude, 20, 1, 0, 2 ) * 0.5f;
        freq = Mathf.Clamp( freq, 0, 2 );


        var step = diff / ( renderer.numPositions - 1 );
        for ( int i = 0; i < renderer.numPositions; i++ ) {
            var p = stickOne.transform.position + ( step * i );
            var normal = new Vector3( diff.y, -diff.x );
            normal.Normalize();

            var sin = Mathf.Sin( ( i * freq ) + Time.realtimeSinceStartup * SineSpeed ) * Amplitude;

            var distToMiddle = Mathf.Pow( ( middle - p ).magnitude, SineLerpPower );


            sin = Mathf.Lerp( sin, 0, ((1f / maxDist) * distToMiddle) );

            p += normal * sin;

            renderer.SetPosition( i, p );
        }
    }
}