using System;
using UnityEngine;
using System.Collections;
using UnityEngine.UI;

public class TweenInOut : MonoBehaviour
{
    private Graphic graphic;
    private RectTransform rectTransform;
    private Rect mapRect;
    private Vector2 defPivot;
    private Vector2 defSize;
    private Vector2 defPosition;
    private Vector2 initialPosition;
    private bool needRestore;

    private Camera worldCamera
    {
        get
        {
            if (graphic.canvas.renderMode == RenderMode.ScreenSpaceOverlay) return null;
            return graphic.canvas.worldCamera;
        }
    }

    private void OnMapClick()
    {
        if (needRestore) RestoreSize();

        Vector2 localPoint;
        RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, Input.mousePosition, worldCamera, out localPoint);

        mapRect = rectTransform.rect;

        defPivot = rectTransform.pivot;
        defSize = rectTransform.sizeDelta;
        defPosition = rectTransform.anchoredPosition;

        initialPosition = Input.mousePosition;

        Vector2 pivot = new Vector2();
        float ox = localPoint.x + mapRect.width * defPivot.x;
        float oy = localPoint.y + mapRect.height * defPivot.y;
        pivot.x = ox / mapRect.width;
        pivot.y = oy / mapRect.height;

        Vector2 offsetMax = rectTransform.offsetMax;
        Vector2 offsetMin = rectTransform.offsetMin;
        rectTransform.pivot = pivot;
        rectTransform.offsetMax = offsetMax;
        rectTransform.offsetMin = offsetMin;

        ZoomIn();
    }

    private void ZoomIn()
    {
        needRestore = true;

        iTween.ScaleTo(gameObject, iTween.Hash(
            "scale", new Vector3(5, 5, 5),
            "time", 3,
            "oncomplete", "ZoomOut"
        ));
    }

    private void ZoomOut()
    {
        iTween.ScaleTo(gameObject, iTween.Hash(
            "scale", Vector3.one,
            "time", 3,
            "oncomplete", "RestoreSize"
        ));
    }

    private void RestoreSize()
    {
        iTween.Stop();

        rectTransform.pivot = defPivot;
        rectTransform.sizeDelta = defSize;
        rectTransform.anchoredPosition = defPosition;
        rectTransform.localScale = Vector3.one;

        needRestore = false;
    }

    private void Start()
    {
        OnlineMapsControlBase.instance.OnMapClick += OnMapClick;
        graphic = GetComponent<Graphic>();
        rectTransform = transform as RectTransform;
        OnlineMapsControlBase.instance.allowZoom = false;
    }
}