/**
 * 
 */
package net.sf.l2j.gameserver.model.geodata;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.util.List;

import javolution.util.FastList;

/**
 * @author zabbix
 *
 */
public class GeoEngine
{
	Long size;

	private List<GeoRegion> _regions = new FastList<GeoRegion>();
	public static GeoEngine _instance = new GeoEngine();

	public GeoEngine()
	{
		//parseZone();
	}

	public static GeoEngine getInstance()
	{
		return _instance;
	}

	public int getHeight(int x, int y)
	{
		int region_x = 20 + ((x - x % 32768) / 32768);
		int region_y = 18 + ((y - y % 32768) / 32768);
		
		System.err.println("region " + region_x + ":" + region_y);
		//System.err.println("offset " + offset_x + ":" + offset_y + " block: [" + block_x + "][" +block_y +"]");
        //System.err.println("cell [" + cell_x + "][" + cell_y + "]");

		//		if(_blocks[block_x][block_y].getType() == 0)
		//			return _blocks[block_x][block_y].getHeight(0);

		for (GeoRegion r : _regions)
		{
			if (r.isValid(region_x,region_y))
				return r.getHeight(x,y);
		}

		return 0;
	}

	public int getFlag(int x, int y)
	{
		int region_x = 20 + ((x - x % 32768) / 32768);
		int region_y = 18 + ((y - y % 32768) / 32768);
		
		System.err.println("region " + region_x + ":" + region_y);
		//System.err.println("offset " + offset_x + ":" + offset_y + " block: [" + block_x + "][" +block_y +"]");
        //System.err.println("cell [" + cell_x + "][" + cell_y + "]");

		//		if(_blocks[block_x][block_y].getType() == 0)
		//			return _blocks[block_x][block_y].getHeight(0);

		for (GeoRegion r : _regions)
		{
			if (r.isValid(region_x,region_y))
				return r.getFlag(x,y);
		}

		return 0;
	}

	
	private void hashFiles(String dirname, List<File> hash)
	{
		File dir = new File("c:/l2j/data/", dirname);
		if (!dir.exists())
		{
			System.err.println("Dir " + dir.getAbsolutePath() + " not exists");
			return;
		}
		File[] files = dir.listFiles();
		for (File f : files)
		{
			if (f.getName().endsWith(".bin")) hash.add(f);
		}
	}

	public void parseZone()
	{
		List<File> files = new FastList<File>();
		hashFiles("geo", files);

		try
		{
			for (File entry : files)
			{
				DataInputStream in = new DataInputStream(new FileInputStream(entry));

				size = entry.length();
				
				int _rx = in.readByte();
				int _ry = in.readByte();
				
				in.skip(16);
				size -= 18;
				
				GeoRegion region = new GeoRegion(_rx,_ry);

				System.err.println("[GeoEngine] loading [" + _rx +"_"+ _ry + "][" + (size / 1024)
					+ "kb]");

				while (size > 0)
				{
					int b = getHeight(in);//in.readShort();

					GeoBlock gb = new GeoBlock(b);

					if (b == 0) // single plane
					{
						int h1 = getHeight(in);
						int h2 = getHeight(in);
						
						gb.addHeight(0, h1);
						gb.addHeight(1, h2);
					}
					else if (b == 0x0040) // multiheight plane
					{
						for (int p = 0; p < 64; p++)
						{
							int h = getHeight(in);
							gb.addHeight(p, h);
							//int h3 = h&0xffff;
							//int h2 = (h>>1);//-(h3^0xffff)>>1;
							//h = (h&0xf);
							//System.err.println("movement flag: "+h+" height: "+h2);
						}
					}
					else
					// multifloor multiheight
					{
						for (int i = 0; i < 64; i++)
						{
							int floor = getHeight(in);

							for (int f = 0; f < floor; f++)
							{
								int fh = getHeight(in);
								gb.addHeight(f, fh);
							}

						}
					}
					region.addBlock(gb);
				}
				_regions.add(region);
				System.gc();
			}
		}
		catch (Exception e)
		{
			System.err.println("Oops: " + e);
		}
		System.err.println("[GeoEngine] total "+_regions.size()+" regions loaded");
	}

	int getHeight(DataInputStream in)
	{
		try
		{
			byte b1 = in.readByte();
			byte b2 = in.readByte();
			size -= 2;
			return b1 + (b2 << 8);
		}
		catch (Exception e)
		{
			System.err.println("height err!: " + e + ", bytes left: "+ size);
			System.exit(0);
		}
		return 0;
	}
}