using System.IO;
using UnityEditor;
using UnityEngine;
using UnityEngine.UI;

public static class ExportSpritesAsFile
{
	/// <summary>
	/// 注意，使用此编辑器拓展需要先选中图集文件
	/// </summary>
	[MenuItem("Tools/图集元素转文件工具")]
	static void ProcessToSprite()
	{
		Texture2D image = Selection.activeObject as Texture2D;//获取选择的对象


		string path = AssetDatabase.GetAssetPath(image);//图片路径名称
		string rootPath = Path.GetDirectoryName(path);//获取路径名称 

		var sfn = image.name;
		if (sfn.StartsWith("SpriteAtlasTexture"))
		{
			var fi = sfn.IndexOf('-') + 1;
			var si = sfn.IndexOf('-', fi);
			var spn = sfn.Substring(fi, si - fi);
			Debug.Log(spn);
		}

		TextureImporter texImp = AssetImporter.GetAtPath(path) as TextureImporter;//获取图片入口

		if (!Directory.Exists(Path.Combine(rootPath, image.name)))
		{
			AssetDatabase.CreateFolder(rootPath, image.name);//创建文件夹
		}


		foreach (SpriteMetaData metaData in texImp.spritesheet)//遍历小图集
		{
			Texture2D myimage = new Texture2D((int)metaData.rect.width, (int)metaData.rect.height);

			//for (int y = (int)metaData.rect.y; y < metaData.rect.y + metaData.rect.height; y++)//Y轴像素
			//{
			//	for (int x = (int)metaData.rect.x; x < metaData.rect.x + metaData.rect.width; x++)
			//		myimage.SetPixel(x - (int)metaData.rect.x, y - (int)metaData.rect.y, image.GetPixel(x, y));
			//}

			myimage.SetPixels(image.GetPixels((int)metaData.rect.x, (int)metaData.rect.y, (int)metaData.rect.width, (int)metaData.rect.height));


			if (myimage.format != TextureFormat.ARGB32 && myimage.format != TextureFormat.RGB24)
			{
				Texture2D newTexture = new Texture2D(myimage.width, myimage.height);
				newTexture.SetPixels(myimage.GetPixels(0), 0);
				myimage = newTexture;
			}
			var pngData = myimage.EncodeToPNG();

			File.WriteAllBytes(rootPath + "/" + image.name + "/" + metaData.name + ".PNG", pngData);
			// 刷新资源窗口界面
			AssetDatabase.Refresh();
		}
	}

	[MenuItem("Tools/图集元素检查工具")]
	static void CheckSprite()
	{
		var sgo = Selection.activeGameObject;
		if (sgo)
		{
			var images = sgo.GetComponentsInChildren<Image>();
			foreach (var image in images)
			{
				if (image.sprite)
				{
					var sp = AssetDatabase.GetAssetPath(image.sprite);
					var sfn = Path.GetFileName(sp);
					if (sfn.StartsWith("SpriteAtlasTexture"))
					{
						Debug.Log(image.name);
					}


					//Debug.Log(sp);
				}
			}

			var srs = sgo.GetComponentsInChildren<SpriteRenderer>();
			foreach (var sr in srs)
			{
				if (sr.sprite)
				{
					var sp = AssetDatabase.GetAssetPath(sr.sprite);
					var sfn = Path.GetFileName(sp);
					if (sfn.StartsWith("SpriteAtlasTexture"))
					{
						Debug.Log(sr.name);
					}


					//Debug.Log(sp);
				}
			}
		}
	}

	[MenuItem("Tools/图集元素替换工具")]
	static void ReplaceSprite()
	{
		var sgo = Selection.activeGameObject;
		if (sgo)
		{
			var images = sgo.GetComponentsInChildren<Image>();
			foreach (var image in images)
			{
				if (image.sprite)
				{
					var sp = AssetDatabase.GetAssetPath(image.sprite);
					var sfn = Path.GetFileName(sp);
					if (sfn.StartsWith("SpriteAtlasTexture"))
					{
						var fi = sfn.IndexOf('-') + 1;
						var si = sfn.IndexOf('-', fi);
						var spn = sfn.Substring(fi, si - fi);
						Debug.Log(spn + " " + image.sprite.name);

						var newsp = sp.Substring(0, sp.Length - 4) + "/" + image.sprite.name + ".png";
						var news = AssetDatabase.LoadAssetAtPath<Sprite>(newsp);
						Debug.Log(news != null ? news.name : "empty");
						if (news)
						{
							image.sprite = news;
						}
						//Debug.Log(newsp);
					}


					//Debug.Log(sp);
				}
			}
		}
	}
}