using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEditor;

namespace ChivaXR
{
    /// <summary>
    /// 屏幕截图管理
    /// </summary>
    public class ScreenShot : EditorWindow
    {
        /// <summary>
        /// 目标相机，即需要用来截图的层级相机
        /// </summary>
        public Camera targetCamera;

        /// <summary>
        /// 最后一个截图的完整路径信息
        /// </summary>
        public string lastScreenshot = "";

        /// <summary>
        /// 用于保存所截图片的文件路径
        /// </summary>
        private string folderPath = "";

        /// <summary>
        /// 预设宽高，默认为屏幕分辨率
        /// </summary>
        private int rectWidth = Screen.width;
        private int rectHight = Screen.height;

        /// <summary>
        /// 默认比例
        /// </summary>
        private int scale = 1;

        /// <summary>
        /// 图片背景是否透明，默认不透明
        /// </summary>
        private bool isTransparent = false;

        /// <summary>
        /// 模型是否居中
        /// </summary>
        private bool isCenter = false;

        /// <summary>
        /// 是否隐藏截屏图片
        /// </summary>
        private bool takeHiResShot = false;

        [MenuItem("ChivaXR/Tool/截 图/高分辨率截图")]
        public static void SceneScreenShot()
        {
            EditorWindow editorWindow = EditorWindow.GetWindow(typeof(ScreenShot));
            editorWindow.autoRepaintOnSceneChange = true;
            editorWindow.Show();
            editorWindow.titleContent = new GUIContent("高分辨率截图");
        }

        private void OnGUI()
        {
            GUIStyle style = new GUIStyle();
            style.fontSize = 16;
            style.normal.textColor = Color.white;


            EditorGUILayout.LabelField("分辨率", style);
            rectWidth = EditorGUILayout.IntField("宽度", rectWidth);
            rectHight = EditorGUILayout.IntField("高度", rectHight);

            EditorGUILayout.Space();

            scale = EditorGUILayout.IntSlider("比例", scale, 1, 15);

            //显示帮助信息
            EditorGUILayout.HelpBox("截图的默认模式是裁剪，所以需要选择合适的宽高，而比例是在不降低质量的情况下增加或放大渲染的一个因素", MessageType.None);

            EditorGUILayout.Space();

            GUILayout.Label(" 保存路径", style);

            EditorGUILayout.BeginHorizontal();
            EditorGUILayout.TextField(folderPath, GUILayout.ExpandWidth(true));
            if (GUILayout.Button("预览", GUILayout.ExpandWidth(false)))
            {
                folderPath = EditorUtility.SaveFolderPanel("保存路径", folderPath, Application.dataPath);
            }
            EditorGUILayout.EndHorizontal();

            EditorGUILayout.HelpBox("选择保存截图的文件夹", MessageType.None);
            EditorGUILayout.Space();

            GUILayout.Label(" 选择相机", style);
            targetCamera = EditorGUILayout.ObjectField(targetCamera, typeof(Camera), true, null) as Camera;

            if (targetCamera == null)
            {
                targetCamera = Camera.main;
            }

            isTransparent = EditorGUILayout.Toggle("背景是否透明", isTransparent);

            EditorGUILayout.HelpBox("选择要捕捉渲染的相机，可以使用透明度选项使背景透明", MessageType.None);

            EditorGUILayout.Space();
            EditorGUILayout.BeginVertical();
            EditorGUILayout.LabelField("默认选项", style);

            if (GUILayout.Button("设置为屏幕尺寸"))
            {
                rectWidth = (int)Handles.GetMainGameViewSize().x;
                rectHight = (int)Handles.GetMainGameViewSize().y;
            }

            if (GUILayout.Button("默认尺寸"))
            {
                rectWidth = 1920;
                rectHight = 1080;
                scale = 1;
            }

            EditorGUILayout.EndVertical();

            EditorGUILayout.Space();
            EditorGUILayout.LabelField("图片分辨率为：" + rectWidth * scale + " x " + rectHight * scale + " px", EditorStyles.boldLabel);

            if (GUILayout.Button("截屏", GUILayout.MinHeight(60)))
            {
                if (folderPath == "")
                {
                    folderPath = EditorUtility.SaveFolderPanel("保存路径", folderPath, Application.dataPath);
                    TakeHiResShot();
                }
                else
                {
                    TakeHiResShot();
                }
            }

            EditorGUILayout.Space();
            EditorGUILayout.BeginHorizontal();

            if (GUILayout.Button("打开最后一个截图", GUILayout.MaxWidth(160), GUILayout.MinHeight(40)))
            {
                if (lastScreenshot != "")
                {
                    Application.OpenURL("file://" + lastScreenshot);
                }
            }

            if (GUILayout.Button("打开文件夹", GUILayout.MaxWidth(160), GUILayout.MinHeight(40)))
            {
                Application.OpenURL("file://" + folderPath);
            }

            EditorGUILayout.EndHorizontal();

            if (takeHiResShot)
            {
                int width = rectWidth * scale;
                int height = rectHight * scale;
                RenderTexture rt = new RenderTexture(width, height, 24);
                targetCamera.targetTexture = rt;

                //纹理格式
                TextureFormat textureFormat;

                if (isTransparent)
                {
                    textureFormat = TextureFormat.ARGB32;
                }
                else
                {
                    textureFormat = TextureFormat.RGB24;
                }

                Texture2D screenShot = new Texture2D(width, height, textureFormat, false);
                targetCamera.Render();
                RenderTexture.active = rt;
                screenShot.ReadPixels(new Rect(0, 0, width, height), 0, 0);
                targetCamera.targetTexture = null;
                RenderTexture.active = null;
                byte[] bytes = screenShot.EncodeToPNG();
                string filename = ScreenShotName(width, height);

                File.WriteAllBytes(filename, bytes);
                Application.OpenURL(filename);
                takeHiResShot = false;
            }
        }

        private void TakeHiResShot()
        {
            takeHiResShot = true;
        }

        /// <summary>
        /// 截图完整路径信息
        /// </summary>
        /// <param name="width"></param>
        /// <param name="height"></param>
        /// <returns></returns>
        public string ScreenShotName(int width, int height)
        {
            string strPath = string.Format(
                                    "{0}/screen_{1}x{2}_{3}.png",
                                    folderPath,
                                    width,
                                    height,
                                    System.DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss"));

            lastScreenshot = strPath;

            return strPath;
        }

        [MenuItem("GameObject/Chiva/固定视角创建预览图", priority = 0)]
        public static void CreatePreview()
        {
            string folderPath = "";
            folderPath = EditorUtility.SaveFolderPanel("保存路径", folderPath, Application.dataPath);

            byte[] bytes = GetAssetPreview(Selection.activeGameObject).EncodeToPNG();
            string filename = string.Format(
                                    "{0}/screen_{1}.png",
                                    folderPath,
                                    System.DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss"));

            File.WriteAllBytes(filename, bytes);
            Application.OpenURL(filename);
        }

        [MenuItem("GameObject/Chiva/Scene视角创建预览图", priority = 0)]
        public static void CreatePreviewBySceneView()
        {
            string folderPath = "";
            folderPath = EditorUtility.SaveFolderPanel("保存路径", folderPath, Application.dataPath);

            byte[] bytes = GetAssetPreview(Selection.activeGameObject, true).EncodeToPNG();
            string filename = string.Format(
                                    "{0}/screen_{1}.png",
                                    folderPath,
                                    System.DateTime.Now.ToString("yyyy-MM-dd_HH-mm-ss"));

            File.WriteAllBytes(filename, bytes);
            Application.OpenURL(filename);
        }

        private static Vector2 previewSize = new Vector2(512, 512);

        /// <summary>
        /// 获取预览图象
        /// </summary>
        /// <param name="obj"></param>
        /// <param name="sceneView">是否按照当前Scene视角截图</param>
        /// <returns></returns>
        private static Texture2D GetAssetPreview(GameObject obj, bool sceneView = false, bool cloneObj = true)
        {
            GameObject clone;
            Transform cloneTransform;
            if (cloneObj)
            {
                clone = GameObject.Instantiate(obj);
                cloneTransform = clone.transform;
                cloneTransform.position = new Vector3(-1000, -1000, -1000);
                cloneTransform.rotation = obj.transform.rotation;
            }
            else
            {
                clone = obj;
                cloneTransform = clone.transform;
            }

            Transform[] all = clone.GetComponentsInChildren<Transform>();
            foreach (Transform trans in all)
            {
                trans.gameObject.layer = 21;
            }

            Bounds bounds = GetBounds(clone);
            Vector3 Min = bounds.min;
            Vector3 Max = bounds.max;
            GameObject cameraObj = new GameObject("render camera");
            Camera renderCamera = cameraObj.AddComponent<Camera>();
            renderCamera.backgroundColor = new Color(0.2f, 0.2f, 0.2f, 0);
            renderCamera.clearFlags = CameraClearFlags.Color;
            renderCamera.cullingMask = 1 << 21;
            renderCamera.nearClipPlane = 0.01f;
            renderCamera.fieldOfView = 30;

            Vector3 center = bounds.center;
            Vector3 position;

            //求相机应当所处的目标位置
            if (sceneView)
            {
                //预览图视角设置为当前Scene视角
                position = center - SceneView.lastActiveSceneView.camera.transform.rotation * (bounds.extents.magnitude * 3.8f * Vector3.forward);
            }
            else
            {
                //固定视角
                position = center - Quaternion.Euler(30, -30, 60) * (bounds.extents.magnitude * 3.8f * Vector3.forward);
            }

            // 更新位置
            cameraObj.transform.position = position;
            cameraObj.transform.LookAt(bounds.center);

            RenderTexture texture = new RenderTexture((int)previewSize.x, (int)previewSize.y, 24, RenderTextureFormat.Default);
            renderCamera.targetTexture = texture;
            renderCamera.RenderDontRestore();

            //纹理格式
            TextureFormat textureFormat = TextureFormat.ARGB32;
            Texture2D screenShot = new Texture2D((int)previewSize.x, (int)previewSize.y, textureFormat, false);
            renderCamera.Render();
            RenderTexture.active = texture;
            screenShot.ReadPixels(new Rect(0, 0, (int)previewSize.x, (int)previewSize.y), 0, 0);
            renderCamera.targetTexture = null;
            RenderTexture.active = null;

            if (cloneObj)
            {
                Object.DestroyImmediate(clone);
            }

            Object.DestroyImmediate(cameraObj);
            return screenShot;
        }


        /// <summary>
        /// 获得某物体的空間bounds
        /// </summary>
        /// <param name="obj"></param>
        private static Bounds GetBounds(GameObject obj)
        {
            Vector3 Min = new Vector3(99999, 99999, 99999);
            Vector3 Max = new Vector3(-99999, -99999, -99999);
            MeshRenderer[] renders = obj.GetComponentsInChildren<MeshRenderer>();
            for (int i = 0; i < renders.Length; i++)
            {
                if (renders[i].bounds.min.x < Min.x)
                    Min.x = renders[i].bounds.min.x;
                if (renders[i].bounds.min.y < Min.y)
                    Min.y = renders[i].bounds.min.y;
                if (renders[i].bounds.min.z < Min.z)
                    Min.z = renders[i].bounds.min.z;

                if (renders[i].bounds.max.x > Max.x)
                    Max.x = renders[i].bounds.max.x;
                if (renders[i].bounds.max.y > Max.y)
                    Max.y = renders[i].bounds.max.y;
                if (renders[i].bounds.max.z > Max.z)
                    Max.z = renders[i].bounds.max.z;
            }

            Vector3 center = (Min + Max) / 2;
            Vector3 size = new Vector3(Max.x - Min.x, Max.y - Min.y, Max.z - Min.z);
            return new Bounds(center, size);
        }
    }
}