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

[RequireComponent (typeof(Rigidbody))]
public class BuoyantObject : WaterObject {


    [Tooltip ("How fast object will raise into the ")]
    public float BouancyValue = 5;

    [Tooltip ("Local point, at which the object floats within the water")]
    public Vector3 BouancyPoint = Vector3.zero;

    //rigidbody attached to GameObject
    protected Rigidbody rb;
    private float airDrag;


    #region Unity Functions
    void Awake() {
    
        rb = GetComponent<Rigidbody>();
        airDrag = rb.drag;
    }

    #endregion Unity Functions


    public override void OnWaterStay(WaterController water,float waveHeight) {

        Vector3 waterEntryPoint = transform.position;
        waterEntryPoint.y = water.transform.position.y + waveHeight;

        float distance = Vector3.Distance(transform.position + (BouancyPoint * transform.lossyScale.magnitude) , waterEntryPoint);

        Vector3 force = Vector3.up * BouancyValue * Mathf.Pow(distance,1.5f);
        if (waterEntryPoint.y < gameObject.transform.position.y + (BouancyPoint.y * transform.lossyScale.y))
            force = Vector3.zero;

        rb.AddForce(force);

        Vector3 dragVel = rb.velocity;
        dragVel.y *= 0.9f;
        rb.velocity = dragVel;

    }

    public override void OnWaterEnter(WaterController water) {
        //rb.drag = 1; 
    }

    public override void OnWaterExit(WaterController water) {
       // rb.drag = airDrag;
    }

    public virtual IEnumerator pushObject(Vector3 point,float power, float totalTime) {
        Vector3 dir = transform.position - point;
        dir = Vector3.ProjectOnPlane(dir, Vector3.up);
        dir.Normalize();

        float elapsedTime = 0;

        while (elapsedTime < totalTime) {

            Vector3 force = dir * power * Time.deltaTime;
            rb.AddForce(force);

            yield return new WaitForEndOfFrame();

            elapsedTime += Time.deltaTime;
        }
    }


    /// <summary>
    /// 
    /// </summary>
    public void BuoyancyCalc() {





    }




}