using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using UnityEditor;

using System.IO;

using System.Xml;

using UnityEditor.Experimental.AssetImporters;

using UnityEditor.Experimental.U2D;

public class SpriteSheetPostprocessor:AssetPostprocessor{

	private void OnPreprocessAsset(){

	}

	private void OnPreprocessTexture(){

		string dataPath=Application.dataPath;

		dataPath=dataPath.Substring(0,dataPath.LastIndexOf("/")+1);

		int dotIndex=assetPath.LastIndexOf('.');

		string xmlPath=assetPath.Substring(0,dotIndex)+".xml";

		xmlPath=dataPath+xmlPath;

		if(File.Exists(xmlPath)){

			OnSpriteSheetProcess(xmlPath);

			/*var texture=AssetDatabase.LoadAssetAtPath<Texture2D>(assetPath);

			if(texture){

				Debug.Log("texture.height:"+texture.height);

				OnSpriteSheetProcess(texture.height,xmlPath);

			}else{

				Debug.Log("null");

				AssetDatabase.ImportAsset(assetPath);

			}*/

		}

    }

	private void OnPostprocessTexture(Texture2D texture){

	}

	private void OnSpriteSheetProcess(string xmlPath){

		var doc=new XmlDocument();

		doc.Load(xmlPath);

		var nodes=doc.DocumentElement.SelectNodes("SubTexture");

		var spritesheet=new SpriteMetaData[nodes.Count];

		float textureHeight=getTextureHeightWithXmlNodes(nodes);

		Vector2 pivot=new Vector2();

		for(int i=0;i<nodes.Count;i++){

			XmlElement ele=nodes[i] as XmlElement;

			if(i==0){

				pivot.x=float.Parse(ele.GetAttribute("pivotX"));

				pivot.y=float.Parse(ele.GetAttribute("pivotY"));

			}

			string name=ele.GetAttribute("name");

			float x=float.Parse(ele.GetAttribute("x"));

			float y=float.Parse(ele.GetAttribute("y"));

			float width=float.Parse(ele.GetAttribute("width"));

			float height=float.Parse(ele.GetAttribute("height"));

			float frameX=float.Parse(ele.GetAttribute("frameX"));

			float frameY=float.Parse(ele.GetAttribute("frameY"));

			float frameWidth=float.Parse(ele.GetAttribute("frameWidth"));

			float frameHeight=float.Parse(ele.GetAttribute("frameHeight"));

			float poX=(frameWidth/2.0f+frameX)/width;

			float poY=((frameHeight-pivot.y)-(frameHeight-height+frameY));

			poY/=height;

			var spriteMetaData=new SpriteMetaData();

			spriteMetaData.name=name;

			spriteMetaData.alignment=(int)SpriteAlignment.Custom;

			spriteMetaData.pivot=new Vector2(poX,poY);

			spriteMetaData.rect=new Rect(x,-y+textureHeight-height,width,height);

			spritesheet[i]=spriteMetaData;

			//

		}

		var importer=assetImporter as TextureImporter;

		importer.spriteImportMode=SpriteImportMode.Multiple;

		importer.spritesheet=spritesheet;

	}

	private float getTextureHeightWithXmlNodes(XmlNodeList nodes){

		float result=0;

		float maxX=0;

		float maxY=0;

		for(int i=0;i<nodes.Count;i++){

			XmlElement ele=nodes[i] as XmlElement;

			float x=float.Parse(ele.GetAttribute("x"));

			float y=float.Parse(ele.GetAttribute("y"));

			float width=float.Parse(ele.GetAttribute("width"));

			float height=float.Parse(ele.GetAttribute("height"));

			float x1=x+width;

			float y1=y+height;

			if(x1>maxX)maxX=x1;

			if(y1>maxY)maxY=y1;

		}

		float max=Mathf.Max(maxX,maxY);

		//flash sprite sheet中，

		//以竖向排列优先[占位高度大于某个(2的次方值)则马上放大图表高度缩小宽度进行排列）,

		//所以如果占位宽大于占位高图表的高度一定是大于占位宽的(2的次方值)]

		int pow=5;//5~13

		while(true){

			float val=1<<pow;

			pow++;

			if(val>max){

				result=val;

				break;

			}else if(pow>=13){

				result=val;

				break;

			}

		}

		Debug2.Log("textureHeight:"+result,"maxX:"+maxX,"maxY:"+maxY);

		return result;

	}

    /*private static void OnPostprocessAllAssets(string[] importedAssets, string[] deletedAssets, string[] movedAssets, string[] movedFromAssetPaths){

        foreach (string str in importedAssets){

			if(str.EndsWith(".png")||str.EndsWith(".PNG")){

				OnSpriteSheetPostprocess(str);

			}

        }

    }

	private static void OnSpriteSheetPostprocess(string path){

		string dataPath=Application.dataPath;

		dataPath=dataPath.Substring(0,dataPath.LastIndexOf("/")+1);

		int dotIndex=path.LastIndexOf('.');

		string xmlPath=path.Substring(0,dotIndex)+".xml";

		xmlPath=dataPath+xmlPath;

		if(File.Exists(xmlPath)){

			var doc=new XmlDocument();

			doc.Load(xmlPath);

			XmlElement firstEle=doc.DocumentElement.FirstChild as XmlElement;

			var nodes=doc.DocumentElement.SelectNodes("SubTexture");

			for(int i=0;i<nodes.Count;i++){

				XmlElement ele=nodes[i] as XmlElement;

				string name=ele.GetAttribute("name");

			}

		}

		//

		//parseAndExportXml(path);

		Debug.Log("OnSpriteSheetPostprocess");

		//var settings=new TextureGenerationSettings();

		//var spriteImportData=new SpriteImportData();

		//spriteImportData.rect=new Rect(0,0,50,50);

		//settings.spriteImportData=new SpriteImportData[]{spriteImportData};

		//TextureGenerator.GenerateTexture(settings,colorBuffer);

	}*/

}