package jrummikub.model;

import static jrummikub.model.StoneTray.Direction.LEFT;
import static jrummikub.model.StoneTray.Direction.RIGHT;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.TreeMap;

import jrummikub.control.AIUtil;
import jrummikub.util.Pair;

/** Class managing a {@link Player}'s {@link Stone}s */
public class Hand extends StoneTray<Stone> implements IHand {
	/**
	 * The width of the hand
	 */
	public final static int WIDTH = 14;

	@Override
	public int getFreeRowSpace(int row) {
		int count = 0;
		for (Pair<Stone, Position> entry : this) {
			if (entry.getSecond().getY() == row) {
				count++;
			}
		}
		return WIDTH - count;
	}

	@Override
	public int getRowCount() {
		int rows = 0;

		for (Pair<Stone, Position> entry : this) {
			if (entry.getSecond().getY() > rows) {
				rows = (int) entry.getSecond().getY();
			}
		}

		return rows + 1;
	}

	@Override
	protected Pair<Position, Direction> fixInvalidDrop(Stone stone,
			Position pos, Direction dir) {
		double x = pos.getX();
		double y = pos.getY();

		if (x >= 0 && x <= WIDTH - 1) {
			return null;
		}
		if (x < 0) {
			return new Pair<Position, Direction>(new Position(0, y), RIGHT);
		} else {
			if (getFreeRowSpace((int) y) == 0) {
				return new Pair<Position, Direction>(new Position(0, y + 1),
						RIGHT);
			} else {
				return new Pair<Position, Direction>(
						new Position(WIDTH - 1, y), LEFT);
			}
		}
	}

	@Override
	public int getStonePoints(GameSettings settings) {
		int points = 0;

		for (Pair<Stone, Position> entry : this) {
			if (entry.getFirst().isJoker()) {
				points += settings.getJokerPoints();
			} else {
				points += entry.getFirst().getValue();
			}
		}

		return points;
	}

	@Override
	public boolean isInitialMeldPossible(GameSettings settings) {
		AIUtil aiUtil = new AIUtil(settings);

		List<Stone> stones = new ArrayList<Stone>();

		for (Iterator<Pair<Stone, Position>> iter = this.iterator(); iter
				.hasNext();) {
			stones.add(iter.next().getFirst());
		}

		Pair<TreeMap<Pair<Integer, StoneColor>, Integer>, Integer> stoneCounts = AIUtil
				.countStones(stones);

		Pair<List<StoneSet>, Integer> result = aiUtil.findSetsWithTotalPoints(
				settings.getInitialMeldThreshold(), stoneCounts.getFirst(),
				stoneCounts.getSecond());

		return (result.getSecond() >= settings.getInitialMeldThreshold());
	}

	@Override
	public int getIdenticalStoneCount() {
		List<Stone> stones = new ArrayList<Stone>();

		for (Iterator<Pair<Stone, Position>> iter = this.iterator(); iter
				.hasNext();) {
			stones.add(iter.next().getFirst());
		}

		Pair<TreeMap<Pair<Integer, StoneColor>, Integer>, Integer> stoneCounts = AIUtil
				.countStones(stones);

		int pairCount = 0;

		for (int count : stoneCounts.getFirst().values()) {
			pairCount += count / 2;
		}

		return pairCount;
	}
}