package me.kalmanolah.extras;

import java.io.File;
import java.io.FileOutputStream;
import java.net.URL;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
import java.util.logging.Logger;

public class OKUpdater{

    public static void update(String name, String ver, String checkloc, String dlloc, Logger log, String prefix){

        try {

            String latestver = null;

            log.info(prefix + "Initiating auto-update...");

            latestver = OKReader.main(checkloc + "?id=" + name);

            if(latestver != null){

                String[] halve = latestver.split("\\&");

                String[] newver = halve[0].split("\\.");

                String[] oldver = ver.split("\\.");

                int g = 0;

                int h = 0;

                for (String s: newver){

                    g++;

                }

                for (String r: oldver){

                    h++;

                }

                String isnew = null;

                if(g > h){

                    isnew = "yes";

                }else if((g == h) || (g < h)){

                    int z = 0;

                    while((z < (g - 1)) || (z == (g - 1)) && isnew == null){

                        if(Integer.parseInt(newver[z]) > Integer.parseInt(oldver[z])){

                            isnew = "yes";

                        }

                        if(Integer.parseInt(newver[z]) < Integer.parseInt(oldver[z])){

                            isnew = "no";

                        }

                        z++;

                    }

                }

                if(isnew == null){

                    isnew = "no";

                }

                if(isnew.equals("yes")){

                    log.info(prefix + "A new version of " + name + ", v" + halve[0] + " is available.");

                    new File("plugins" + File.separator + name).mkdir();

                    new File("plugins" + File.separator + name + File.separator + "update").mkdir();

                    File file = new File("plugins" + File.separator + name + File.separator + "update" + File.separator + halve[1]);

                    if(!file.exists()){

                        log.info(prefix + "Starting download of " + name + " v" + halve[0] + "...");

                        FileOutputStream fos;

                        URL url = new URL(dlloc + "?id=" + name + "&ver=" + halve[0] + "&mc=1");

                        ReadableByteChannel rbc = Channels.newChannel(url.openStream());

                        fos = new FileOutputStream("plugins" + File.separator + name + File.separator + "update" + File.separator + halve[1]);

                        fos.getChannel().transferFrom(rbc, 0, 1 << 24);

                        fos.close();

                        log.info(prefix + halve[1] + " downloaded to " + File.separator + "plugins" + File.separator + name + File.separator + "update" + File.separator + ".");

                    }else{

                        file.delete();

                        log.info(prefix + "Starting download of " + name + " v" + halve[0] + "...");

                        FileOutputStream fos;

                        URL url = new URL(dlloc + "?id=" + name + "&ver=" + halve[0] + "&mc=1");

                        ReadableByteChannel rbc = Channels.newChannel(url.openStream());

                        fos = new FileOutputStream("plugins" + File.separator + name + File.separator + "update" + File.separator + halve[1]);

                        fos.getChannel().transferFrom(rbc, 0, 1 << 24);

                        fos.close();

                        log.info(prefix + halve[1] + " downloaded to " + File.separator + "plugins" + File.separator + name + File.separator + "update" + File.separator + ".");

                    }

                }else{

                    log.info(prefix + "You already have the latest version of " + name + ".");

                }

            }

        } catch (Exception e) {
            log.info(prefix + "Error while checking for latest version.");
        }


    }

}