using System;
using TouchScript.Gestures.TransformGestures;
using UnityEngine;

namespace HK
{
    public class ImageTransformController : MonoBehaviour
    {
        private ScreenTransformGesture transformGesture;

        // 移动速度系数
        public float moveSpeed = 1f;

        // 缩放速度系数
        public float scaleSpeed = 0.01f;

        // 旋转速度系数
        public float rotateSpeed = 1f;

        private void Awake()
        {
            transformGesture = GetComponent<ScreenTransformGesture>();
        }

        private void OnEnable()
        {
            transformGesture.Transformed += OnTransformed;
        }

        private void OnDisable()
        {
            transformGesture.Transformed -= OnTransformed;
        }

        private void OnTransformed(object sender, EventArgs e)
        {
            Debug.Log("position " + transformGesture.DeltaPosition);
            Debug.Log("scale " + transformGesture.DeltaScale);
            Debug.Log("rotation " + transformGesture.DeltaRotation);
            var rectTransform = transform.GetComponent<RectTransform>();

            // 移动
            rectTransform.anchoredPosition3D += transformGesture.DeltaPosition * moveSpeed;

            // 缩放
            float scaleFactor = transformGesture.DeltaScale > 1
                ? transformGesture.DeltaScale * scaleSpeed
                : 1 / (2 - transformGesture.DeltaScale) * scaleSpeed;

            Vector3 newScale = transform.localScale * scaleFactor;
            newScale = Vector3.Max(newScale, Vector3.one * 0.5f); // 最小缩放限制
            newScale = Vector3.Min(newScale, Vector3.one * 3f); // 最大缩放限制
            transform.localScale = newScale;

            // 旋转
            transform.Rotate(0, 0, transformGesture.DeltaRotation * rotateSpeed, Space.Self);
        }
    }
}