package net.minecraft.src;



import java.io.*;

import java.util.List;

import java.util.logging.Logger;



public class SaveHandler implements ISaveHandler

{

    /** Reference to the logger. */

    private static final Logger logger = Logger.getLogger("Minecraft");



    /** The path to the current savegame directory */

    private final File saveDirectory;



    /** The directory in which to save player information */

    private final File playersDirectory;

    private final File mapDataDir;



    /**

     * The time in milliseconds when this field was initialized. Stored in the session lock file.

     */

    private final long initializationTime = System.currentTimeMillis();



    /** The directory name of the world */

    private final String saveDirectoryName;



    public SaveHandler(File par1File, String par2Str, boolean par3)

    {

        saveDirectory = new File(par1File, par2Str);

        saveDirectory.mkdirs();

        playersDirectory = new File(saveDirectory, "players");

        mapDataDir = new File(saveDirectory, "data");

        mapDataDir.mkdirs();

        saveDirectoryName = par2Str;



        if (par3)

        {

            playersDirectory.mkdirs();

        }



        setSessionLock();

    }



    /**

     * Creates a session lock file for this process

     */

    private void setSessionLock()

    {

        try

        {

            File file = new File(saveDirectory, "session.lock");

            DataOutputStream dataoutputstream = new DataOutputStream(new FileOutputStream(file));



            try

            {

                dataoutputstream.writeLong(initializationTime);

            }

            finally

            {

                dataoutputstream.close();

            }

        }

        catch (IOException ioexception)

        {

            ioexception.printStackTrace();

            throw new RuntimeException("Failed to check session lock, aborting");

        }

    }



    /**

     * gets the File object corresponding to the base directory of this save (saves/404 for a save called 404 etc)

     */

    protected File getSaveDirectory()

    {

        return saveDirectory;

    }



    /**

     * Checks the session lock to prevent save collisions

     */

    public void checkSessionLock()

    {

        try

        {

            File file = new File(saveDirectory, "session.lock");

            DataInputStream datainputstream = new DataInputStream(new FileInputStream(file));



            try

            {

                if (datainputstream.readLong() != initializationTime)

                {

                    throw new MinecraftException("The save is being accessed from another location, aborting");

                }

            }

            finally

            {

                datainputstream.close();

            }

        }

        catch (IOException ioexception)

        {

            throw new MinecraftException("Failed to check session lock, aborting");

        }

    }



    /**

     * Returns the chunk loader with the provided world provider

     */

    public IChunkLoader getChunkLoader(WorldProvider par1WorldProvider)

    {

        throw new RuntimeException("Old Chunk Storage is no longer supported.");

    }



    /**

     * Loads and returns the world info

     */

    public WorldInfo loadWorldInfo()

    {

        File file = new File(saveDirectory, "level.dat");



        if (file.exists())

        {

            try

            {

                NBTTagCompound nbttagcompound = CompressedStreamTools.readCompressed(new FileInputStream(file));

                NBTTagCompound nbttagcompound2 = nbttagcompound.getCompoundTag("Data");

                return new WorldInfo(nbttagcompound2);

            }

            catch (Exception exception)

            {

                exception.printStackTrace();

            }

        }



        file = new File(saveDirectory, "level.dat_old");



        if (file.exists())

        {

            try

            {

                NBTTagCompound nbttagcompound1 = CompressedStreamTools.readCompressed(new FileInputStream(file));

                NBTTagCompound nbttagcompound3 = nbttagcompound1.getCompoundTag("Data");

                return new WorldInfo(nbttagcompound3);

            }

            catch (Exception exception1)

            {

                exception1.printStackTrace();

            }

        }



        return null;

    }



    /**

     * saves level.dat and backs up the existing one to level.dat_old

     */

    public void saveWorldInfoAndPlayer(WorldInfo par1WorldInfo, List par2List)

    {

        NBTTagCompound nbttagcompound = par1WorldInfo.getNBTTagCompoundWithPlayers(par2List);

        NBTTagCompound nbttagcompound1 = new NBTTagCompound();

        nbttagcompound1.setTag("Data", nbttagcompound);



        try

        {

            File file = new File(saveDirectory, "level.dat_new");

            File file1 = new File(saveDirectory, "level.dat_old");

            File file2 = new File(saveDirectory, "level.dat");

            CompressedStreamTools.writeCompressed(nbttagcompound1, new FileOutputStream(file));



            if (file1.exists())

            {

                file1.delete();

            }



            file2.renameTo(file1);



            if (file2.exists())

            {

                file2.delete();

            }



            file.renameTo(file2);



            if (file.exists())

            {

                file.delete();

            }

        }

        catch (Exception exception)

        {

            exception.printStackTrace();

        }

    }



    /**

     * Saves the passed in world info.

     */

    public void saveWorldInfo(WorldInfo par1WorldInfo)

    {

        NBTTagCompound nbttagcompound = par1WorldInfo.getNBTTagCompound();

        NBTTagCompound nbttagcompound1 = new NBTTagCompound();

        nbttagcompound1.setTag("Data", nbttagcompound);



        try

        {

            File file = new File(saveDirectory, "level.dat_new");

            File file1 = new File(saveDirectory, "level.dat_old");

            File file2 = new File(saveDirectory, "level.dat");

            CompressedStreamTools.writeCompressed(nbttagcompound1, new FileOutputStream(file));



            if (file1.exists())

            {

                file1.delete();

            }



            file2.renameTo(file1);



            if (file2.exists())

            {

                file2.delete();

            }



            file.renameTo(file2);



            if (file.exists())

            {

                file.delete();

            }

        }

        catch (Exception exception)

        {

            exception.printStackTrace();

        }

    }



    /**

     * Gets the file location of the given map

     */

    public File getMapFileFromName(String par1Str)

    {

        return new File(mapDataDir, (new StringBuilder()).append(par1Str).append(".dat").toString());

    }



    /**

     * Returns the name of the directory where world information is saved

     */

    public String getSaveDirectoryName()

    {

        return saveDirectoryName;

    }

}