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

public class EmitterController : MonoBehaviour
{
    public bool debugMode = true;
    public bool randomWalk;
    public VisualEffect vfx;
    public GameObject baseEmitter;
    public GameObject target;
    public float growingSpeed = 0.002f;
    public Camera cam;

    float spawn_t;
    float total_t;
    float lerp_val;
    Vector3 final_pos;
    Transform target_trans;
    
    void Start()
    {
        spawn_t = 0;
        total_t = 0;
        //target_trans = target.GetComponent<Transform>();
        //cam = Camera.main;
    }

    // Update is called once per frame
    void Update()
    {
        Vector3 base_pos = baseEmitter.GetComponent<Transform>().position;
        Vector3 target_pos = target.GetComponent<Transform>().position;
        
        if (Input.GetMouseButton(0) == false)
        {
            lerp_val -= growingSpeed;
        }

        lerp_val = Mathf.Clamp(lerp_val, 0, 1);
        if(Input.GetMouseButton(0) == false && lerp_val == 0)
        {
            vfx.SendEvent("HasLeft");
        }

        final_pos = Vector3.Lerp(base_pos, target_pos, lerp_val);
        transform.position = final_pos;

        if (Input.GetKeyDown(KeyCode.D))
        {
            debugMode = !debugMode;
            baseEmitter.GetComponent<Renderer>().enabled = debugMode;
            target.GetComponent<Renderer>().enabled = debugMode;
            GetComponent<Renderer>().enabled = debugMode;
        }
    }

    private void OnMouseDown()
    {
        spawn_t = total_t;
        vfx.SendEvent("MouseDown");
        //Debug.Log("Enter");
        vfx.SetBool("_mouseDown", true);
    }

    private void OnMouseDrag()
    {
        total_t += Time.deltaTime;
        lerp_val += growingSpeed;
        vfx.SetFloat("_LerpVal", lerp_val);
        //vfx.SetBool("_mouseDown", true);
    }

    private void OnMouseUp()
    {
        //vfx.SendEvent("MouseUp");
        vfx.SetBool("_mouseDown", false);
    }

 
}