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

public class PlayerInput : MonoBehaviour
{
    [Header("Refs")]
    public bool isBlue;
    public Camera targetCam;
    public EventTrigger eventTrigger;
    public RectTransform rectTransform;

    [Header("Settings")]
    public Vector2 PlayAreaSize;
    public Vector2 PlayAreaPosition;
    public Vector2 relativePos;
    public Vector3 worldSpace;
    [HideInInspector]
    public Vector2 left,right,top,bottom;
    public float offsetMultiplier = 1.2f; //at 0.89 its at 1

    void Start()
    {
        eventTrigger = GetComponent<EventTrigger>();
        EventTrigger.Entry entry = new EventTrigger.Entry();
        entry.eventID = EventTriggerType.PointerDown;
        entry.callback.AddListener((data) => { OnPointerDown((PointerEventData)data); });
        eventTrigger.triggers.Add(entry);

        EventTrigger.Entry entry3 = new EventTrigger.Entry();
        entry3.eventID = EventTriggerType.Drag;
        entry3.callback.AddListener((data) => { OnMove((PointerEventData)data); });
        eventTrigger.triggers.Add(entry3);

        EventTrigger.Entry entry5 = new EventTrigger.Entry();
        entry5.eventID = EventTriggerType.PointerEnter;
        entry5.callback.AddListener((data) => { OnPointerEnter((PointerEventData)data); });
        eventTrigger.triggers.Add(entry5);


        EventTrigger.Entry entry6 = new EventTrigger.Entry();
        entry6.eventID = EventTriggerType.PointerExit;
        entry6.callback.AddListener((data) => { OnPointerExit((PointerEventData)data); });
        eventTrigger.triggers.Add(entry6);

    }

    Vector3 startMousePos;
    bool isDown;
    bool isIn;
    void OnPointerDown(PointerEventData data)
    {
        Debug.Log("OnPointerDown");

        UpdatePosition(data);
        isDown=true;
    }


    void GetBorders(){
        left = new Vector2(rectTransform.position.x - rectTransform.rect.width/2,rectTransform.position.y);
        right = new Vector2(rectTransform.position.x + rectTransform.rect.width/2,rectTransform.position.y);
        top = new Vector2(rectTransform.position.x,rectTransform.position.y + rectTransform.rect.height/2);
        bottom = new Vector2(rectTransform.position.x,rectTransform.position.y - rectTransform.rect.height/2);
    }

    Vector2 GetRelativePosition(Vector2 pos){
        GetBorders();
        float xMid = left.x + (right.x - left.x)/2;
        float yMid = bottom.y + (top.y - bottom.y)/2;
        float x = (pos.x - xMid) / (right.x - left.x);
        float y = (pos.y - yMid) / (top.y - bottom.y);
        return new Vector2(x,y);
    }
    void OnMove(PointerEventData data)
    {
        if(isIn){
            UpdatePosition(data);
        }
    }

    void UpdatePosition(PointerEventData data){
        if(!isIn){return;}
        relativePos = GetRelativePosition(data.position) * offsetMultiplier;
        worldSpace = new Vector2(relativePos.x * PlayAreaSize.x + PlayAreaPosition.x,relativePos.y * PlayAreaSize.y + PlayAreaPosition.y);
        
        
    }

    void OnPointerEnter(PointerEventData data)
    {
        Debug.Log("OnPointerEnter");
        isIn=true;
    }

    void OnPointerExit(PointerEventData data)
    {
        Debug.Log("OnPointerExit");
        isIn=false;
    }

    void OnDrawGizmos(){
        Gizmos.color = isBlue ? Color.blue : Color.red;
        Gizmos.DrawWireCube(PlayAreaPosition,PlayAreaSize);
    }
    
}