package dk.thoerup.bukkit.hoeruputils;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.bukkit.Chunk;
import org.bukkit.Location;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.world.ChunkUnloadEvent;

public class StickyChunk implements Listener, CommandExecutor {
	
	public class ChunkBean {
		
		public ChunkBean(Chunk c) {
			this.world = c.getWorld().getName();
			this.x = c.getX();
			this.z = c.getZ();
			
			this.x_min = this.x - 1;
			this.x_max = this.x + 1;
			this.z_min = this.z - 1;
			this.z_max = this.z + 1;			
		}
		
		public String world;
		public int x;
		public int z;
		
		public int x_min;
		public int x_max;
		
		public int z_min;
		public int z_max;		
	}
	
	
	List<ChunkBean> chunks = Collections.synchronizedList( new ArrayList<ChunkBean>() );
	
	
	
	@Override
	public boolean onCommand(final CommandSender sender, Command command, String label, String[] args) {
		
		if ( ! (sender instanceof Player) ) {			
			sender.sendMessage("stickychunk is not a console command");
			return false;
		}		
		Player p = (Player) sender;
		
		if (p.isOp()==false && p.hasPermission("hoeruputils.chunks")==false) {
			sender.sendMessage("you don't have permission to do this");
			return false;
		}
		
		Location l = p.getLocation();
		
		ChunkBean chunk = new ChunkBean( l.getWorld().getChunkAt( l ) );
		chunks.add(chunk);
		
		sender.sendMessage("chunk registeret ok");
				
		return true;
	}


	@EventHandler
	public void chunkUnload(ChunkUnloadEvent event) {
		synchronized(chunks) {
			
			for (ChunkBean chunk : chunks) {
				Chunk c = event.getChunk();
				if (c.getWorld().getName().equals( chunk.world )) {
					int x = c.getX();
					int z = c.getZ();				

					if (x >= chunk.x_min && x <= chunk.x_max && z>=chunk.z_min && z<=chunk.z_max) {
						//System.out.println("Cancelling unload " + x + " " + z);
						event.setCancelled(true);
						return; //
					}
				}

			}				
		}
	}
	
}