package customskinloader.utils;

import java.io.File;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.FilenameUtils;

import customskinloader.CustomSkinLoader;

public class HttpTextureUtil {
	public static class HttpTextureInfo{
		public String url="";
		public File cacheFile;
		public String hash;
	}
	private static final String 
			LEGACY_MARK="(LEGACY)",
			LOCAL_MARK="(LOCAL)",
			LOCAL_LEGACY_MARK="(LOCAL_LEGACY)";
	
	public static HttpTextureInfo toHttpTextureInfo(File defaultCacheDir,String fakeUrl){
		HttpTextureInfo info=new HttpTextureInfo();
		if(fakeUrl.startsWith("http")){
			info.url=fakeUrl;
			info.hash=FilenameUtils.getBaseName(fakeUrl);
            info.cacheFile=getCacheFile(defaultCacheDir,info.hash);
            return info;
		}
		if(fakeUrl.startsWith(LOCAL_LEGACY_MARK)){
			fakeUrl=fakeUrl.replaceFirst(LOCAL_LEGACY_MARK, "");
			String[] t=fakeUrl.split(",",2);
			if(t.length!=2)
				return info;
			info.cacheFile=new File(CustomSkinLoader.DATA_DIR,t[1]);
			info.hash=t[0];
			return info;
		}
		if(fakeUrl.startsWith(LOCAL_MARK)){
			fakeUrl=fakeUrl.replaceFirst(LOCAL_MARK, "");
			info.cacheFile=new File(CustomSkinLoader.DATA_DIR,fakeUrl);
			info.hash=FilenameUtils.getBaseName(fakeUrl);
			return info;
		}
		if(fakeUrl.startsWith(LEGACY_MARK)){
			fakeUrl=fakeUrl.replaceFirst(LEGACY_MARK, "");
			String[] t=fakeUrl.split(",",2);
			if(t.length!=2)
				return info;
			info.url=t[1];
			info.hash=t[0];
			info.cacheFile=getCacheFile(defaultCacheDir,info.hash);
			return info;
		}
		return info;
	}
	
	public static String getLegacyFakeUrl(String url,String hash){
		return LEGACY_MARK+hash+","+url;
	}
	public static String getLocalFakeUrl(String path){
		return LOCAL_MARK+path;
	}
	public static String getLocalLegacyFakeUrl(String path,String hash){
		return LOCAL_LEGACY_MARK+hash+","+path;
	}
	public static String getHash(String url,long size,long lastModified){
		return DigestUtils.sha1Hex(size+url+lastModified);
	}
	
	private static File getCacheFile(File cacheDir,String hash){
		return new File(new File(cacheDir,hash.length()>2?hash.substring(0,2):"xx"), hash);
	}	
}