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package jadex.web.examples.puzzle.agent;

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

import jadex.bdiv3.runtime.IGoal;
import jadex.bdiv3x.runtime.ICandidateInfo;
import jadex.bdiv3x.runtime.Plan;
import jadex.commons.SUtil;
import jadex.web.examples.puzzle.Board;
import jadex.web.examples.puzzle.Move;
import jadex.web.examples.puzzle.Piece;

/**
 *  Meta-level reasoning plan for choosing between applicable plans.
 */
public class ChooseMovePlan extends Plan
{
	/**
	 *  The plan body.
	 */
	public void body()
	{
		//System.out.println("Meta");
		ICandidateInfo[] apps = (ICandidateInfo[])getParameterSet("applicables").getValues();
		IGoal	movegoal	= (IGoal)apps[0].getElement();

		assert apps.length>0;

		ICandidateInfo sel = null;
		Board board = (Board)movegoal.getParameter("board").getValue();
		String ml = (String)getBeliefbase().getBelief("ml").getFact();
		if(ml.equals("none"))
			sel = apps[0];
		else if(ml.equals("short"))
			sel = selectPlan(apps, board, true, false, false, true);
		else if(ml.equals("long"))
			sel = selectPlan(apps, board, true, true, false, true);
		else if(ml.equals("same_long"))
			sel = selectPlan(apps, board, true, true, true, true);
		else if(ml.equals("alter_long"))
			sel = selectPlan(apps, board, false, true, true, true);
		else
			throw new RuntimeException("Wrong meta-level strategy.");

		getParameterSet("result").addValue(sel);
	}

	/**
	 *  Select a move with respect to color resp. move kind (jump vs. normal).
	 *  @param apps The list of applicables.
	 *  @param board The board.
	 *  @param same Prefer moves of same color.
	 *  @param jump Prefer jump moves.
	 *  @param consider_color Consider the color.
	 *  @param consider_jump Consider the move kind.
	 */
	protected ICandidateInfo selectPlan(ICandidateInfo[] apps, Board board, boolean same, boolean jump,
		boolean consider_color, boolean consider_jump)
	{
		List sel_col = new ArrayList();
		if(consider_color)
		{
			for(int i=0; i sel_jump = new ArrayList();
		if(consider_jump)
		{
			for(int i=0; i0 || sel_jump.size()>0 || apps.length>0;

		ICandidateInfo ret = null;
		if(sel_jump.size()>0)
			ret = sel_jump.get(0);
		else if(sel_col.size()>0)
			ret = sel_col.get(0);
		else
			ret = apps[0];

		return ret;
	}


	/**
	 *  Match move with color constraint.
	 */
	protected boolean matchColor(Board board, Move move, boolean prefer_samecolor)
	{
		Piece piece = board.getPiece(move.getStart());
		if(piece==null)
			throw new RuntimeException("Impossible move: "+move);
		boolean same = board.wasLastMoveWhite()==board.getPiece(move.getStart()).isWhite();
		return prefer_samecolor==same;
	}

	/**
	 *  Match move with jump constraint.
	 */
	protected boolean matchJump(Board board, Move move, boolean prefer_jump)
	{
		return prefer_jump==move.isJumpMove();
	}
}