using FairyGUI;
using GFGGame.Launcher;
using UnityEngine;

namespace GFGGame
{
    public class ScaleGestureController : SingletonMonoBase<ScaleGestureController>
    {
        public Transform target; //目标

        //缩放
        public bool isScaling;
        Vector3 touch1, touch2, oriPos, scaleCenter;
        float scale, disX, disY, oriScale;
        public float scaleSpeed = 1;
        public float min = 1f;
        public float max = 1.7f;


        //移动
        private bool isDraging;
        private Vector3 offset = Vector3.zero;
        public Vector2 uiSize;

        private void Update()
        {
            if (target == null)
            {
                isScaling = false;
                isDraging = false;
                return;
            }
            if(Input.touchCount != 2)
            {
                isScaling = false;
            }
            if (isScaling)
            {
                //两指缩放比例
                scale = Vector3.Distance(Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position), Camera.main.ScreenToWorldPoint(Input.GetTouch(1).position)) / Vector3.Distance(touch1, touch2);

                //利用scaleSpeed控制缩放速度
                scale = (scale - 1) * scaleSpeed;
                var targetScale = oriScale + scale;
                //给缩放比例加限制
                if (targetScale <= min && scale < 0)
                {
                    targetScale = min;
                }
                if (targetScale >= max && scale > 0)
                {
                    targetScale = max;
                }

                LogUtil.LogDev($"scaling {oriScale} {scale}");
                //缩放目标大小
                target.localScale = new Vector3(targetScale, targetScale, 1);
                //改变目标位置，让位置保持不变
                target.position = new Vector3(oriPos.x - ((target.localScale.x - oriScale) * disX), oriPos.y - ((target.localScale.y - oriScale) * disY), 0);
                UpdatePos();
            }
            if (Input.touchCount == 2)
            {
                //两指点位
                touch1 = Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position);
                touch2 = Camera.main.ScreenToWorldPoint(Input.GetTouch(1).position);

                //目标初始点位
                oriPos = new Vector3(target.position.x, target.position.y, 0);

                //两指中点
                scaleCenter = new Vector3((Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position).x + Camera.main.ScreenToWorldPoint(Input.GetTouch(1).position).x) / 2, (Camera.main.ScreenToWorldPoint(Input.GetTouch(0).position).y + Camera.main.ScreenToWorldPoint(Input.GetTouch(1).position).y) / 2, 0);

                //两指中点和目标距离
                disX = scaleCenter.x - oriPos.x;
                disY = scaleCenter.y - oriPos.y;
                oriScale = target.localScale.x;
                LogUtil.LogDev($"start scale {oriPos} {oriScale}");


                isScaling = true;
            }

            if (!Input.GetMouseButton(0) || isScaling)
            {
                isDraging = false;
                return;
            }
            if (isDraging)
            {
                target.position = Camera.main.ScreenToWorldPoint(Input.mousePosition - offset);
                UpdatePos();
            }
            else if (Input.GetMouseButtonDown(0))
            {
                //LogUtil.LogEditor($"DragGestureController {GRoot.inst.touchTarget} {Input.touchCount}");
                if (GRoot.inst.touchTarget != null && !(GRoot.inst.touchTarget is GGraph)) return;
                isDraging = true;
                offset = Input.mousePosition - Camera.main.WorldToScreenPoint(target.position);
            }
        }

        public void UpdatePos()
        {
            if (target == null) return;
            Vector2 size = target.Find("Bg").GetComponent<SpriteRenderer>().size * target.localScale.x;

            float deviationWidth = (size.x - uiSize.x / 100) / 2;
            float deviationHeigh = (size.y - uiSize.y / 100) / 2;
            Vector2 pos = target.transform.position;
            if (pos.x <= -deviationWidth)
            {
                target.transform.position = new Vector2(-deviationWidth, target.transform.position.y);
            }
            if (pos.x >= deviationWidth)
            {
                target.transform.position = new Vector2(deviationWidth, target.transform.position.y);
            }
            if (pos.y <= -deviationHeigh)
            {
                target.transform.position = new Vector2(target.transform.position.x, -deviationHeigh);
            }
            if (pos.y >= deviationHeigh)
            {
                target.transform.position = new Vector2(target.transform.position.x, deviationHeigh);
            }
        }

    }
}