/*
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package com.l2jserver.gameserver.pathfinding;

import java.util.List;

import com.l2jserver.Config;
import com.l2jserver.gameserver.model.L2World;
import com.l2jserver.gameserver.pathfinding.cellnodes.CellPathFinding;
import com.l2jserver.gameserver.pathfinding.geonodes.GeoPathFinding;

/**
 * @author -Nemesiss-
 */
public abstract class PathFinding
{
	public static PathFinding getInstance()
	{
		if (!Config.GEODATA_CELLFINDING)
		{
			// Higher Memory Usage, Smaller Cpu Usage
			return GeoPathFinding.getInstance();
		}
		return CellPathFinding.getInstance();
	}
	
	public abstract boolean pathNodesExist(short regionoffset);
	
	public abstract List<AbstractNodeLoc> findPath(int x, int y, int z, int tx, int ty, int tz, int instanceId, boolean playable);
	
	/*
	 * public List<AbstractNodeLoc> search(AbstractNode start, AbstractNode end, int instanceId) { // The simplest grid-based pathfinding. // Drawback is not having higher cost for diagonal movement (means funny routes) // Could be optimized e.g. not to calculate backwards as far as forwards. //
	 * List of Visited Nodes LinkedList<AbstractNode> visited = new LinkedList<AbstractNode>(); // List of Nodes to Visit LinkedList<AbstractNode> to_visit = new LinkedList<AbstractNode>(); to_visit.add(start); int i = 0; while (i < 800) { AbstractNode node; try { node = to_visit.removeFirst(); }
	 * catch (Exception e) { // No Path found return null; } if (node.equals(end)) //path found! return constructPath(node, instanceId); else { i++; visited.add(node); node.attachNeighbors(); Node[] neighbors = node.getNeighbors(); if (neighbors == null) continue; for (Node n : neighbors) { if
	 * (!visited.contains(n) && !to_visit.contains(n)) { n.setParent(node); to_visit.add(n); } } } } //No Path found return null; }
	 */
	/*
	 * public List<AbstractNodeLoc> searchAStar(Node start, Node end, int instanceId) { // Not operational yet? int start_x = start.getLoc().getX(); int start_y = start.getLoc().getY(); int end_x = end.getLoc().getX(); int end_y = end.getLoc().getY(); //List of Visited Nodes FastNodeList visited =
	 * new FastNodeList(800);//TODO! Add limit to cfg // List of Nodes to Visit BinaryNodeHeap to_visit = new BinaryNodeHeap(800); to_visit.add(start); int i = 0; while (i < 800)//TODO! Add limit to cfg { AbstractNode node; try { node = to_visit.removeFirst(); } catch (Exception e) { // No Path
	 * found return null; } if (node.equals(end)) //path found! return constructPath(node, instanceId); else { visited.add(node); node.attachNeighbors(); for (Node n : node.getNeighbors()) { if (!visited.contains(n) && !to_visit.contains(n)) { i++; n.setParent(node); n.setCost(Math.abs(start_x -
	 * n.getLoc().getNodeX()) + Math.abs(start_y - n.getLoc().getNodeY()) + Math.abs(end_x - n.getLoc().getNodeX()) + Math.abs(end_y - n.getLoc().getNodeY())); to_visit.add(n); } } } } //No Path found return null; }
	 */
	/**
	 * Convert geodata position to pathnode position
	 * @param geo_pos
	 * @return pathnode position
	 */
	public short getNodePos(int geo_pos)
	{
		return (short) (geo_pos >> 3); // OK?
	}
	
	/**
	 * Convert node position to pathnode block position
	 * @param geo_pos
	 * @return pathnode block position (0...255)
	 */
	public short getNodeBlock(int node_pos)
	{
		return (short) (node_pos % 256);
	}
	
	public byte getRegionX(int node_pos)
	{
		return (byte) ((node_pos >> 8) + Config.WORLD_X_MIN);
	}
	
	public byte getRegionY(int node_pos)
	{
		return (byte) ((node_pos >> 8) + Config.WORLD_Y_MIN);
	}
	
	public short getRegionOffset(byte rx, byte ry)
	{
		return (short) ((rx << 5) + ry);
	}
	
	/**
	 * Convert pathnode x to World x position
	 * @param node_x, rx
	 * @return
	 */
	public int calculateWorldX(short node_x)
	{
		return L2World.MAP_MIN_X + (node_x * 128) + 48;
	}
	
	/**
	 * Convert pathnode y to World y position
	 * @param node_y
	 * @return
	 */
	public int calculateWorldY(short node_y)
	{
		return L2World.MAP_MIN_Y + (node_y * 128) + 48;
	}
	
	public String[] getStat()
	{
		return null;
	}
}