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

public class PlayerController : MonoBehaviour {

    [SerializeField]
    private float _force = 1.5f;
    private Rigidbody2D _rb;
    private bool _isMouseOver, _lmbClickedOnPlayer;
    private Vector3 _mouseClickPosition;

    // Use this for initialization
    void Start () {
        _rb = GetComponent<Rigidbody2D> ();
        _lmbClickedOnPlayer = false;
        _isMouseOver = false;
    }

    // Update is called once per frame
    void Update () {

    }

    void OnMouseOver()
    {
        _isMouseOver = true;
    }

    void OnMouseExit()
    {
        _isMouseOver = false;
    }

    void OnMouseDown(){
        if (_isMouseOver)
            _lmbClickedOnPlayer = true;
            _mouseClickPosition = Input.mousePosition;
    }

    void OnMouseUp(){
        if (_lmbClickedOnPlayer)
        {
            Dash();
        }
    }

    private void Dash()
    {
        Debug.Log("Dash");
        _rb.bodyType = RigidbodyType2D.Dynamic;
        Vector3 mouseUpPosition = Input.mousePosition;
        Vector2 forceVector = CalculateCounterVector2D(_mouseClickPosition, mouseUpPosition) / 50;
        _rb.AddForce(forceVector, ForceMode2D.Impulse);
    }

    public void Cling(Vector2 position)
    {
        StartCoroutine(AdjustPosition(position));
    }

    private IEnumerator AdjustPosition(Vector2 position)
    {
        while (Vector2.Distance(_rb.position, position) > 0.01)
        {
            _rb.MovePosition(position);
            yield return new WaitForFixedUpdate();
        }
        _rb.bodyType = RigidbodyType2D.Static;
        yield return null;
    }

    Vector3 CalculateCounterVector2D(Vector3 origin, Vector3 end){
        Vector3 result = (origin - end)*_force;
        return new Vector2 (result.x, 2.5f * result.y);
    }
}