package dev.kske.chess.pgn;

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
import java.util.regex.MatchResult;
import java.util.regex.Pattern;

import dev.kske.chess.board.Board;
import dev.kske.chess.exception.ChessException;

/**
 * Project: <strong>Chess</strong><br>
 * File: <strong>PGNGame.java</strong><br>
 * Created: <strong>22 Sep 2019</strong><br>
 * Author: <strong>Kai S. K. Engelbart</strong>
 */
public class PGNGame {

	private final Map<String, String>	tagPairs	= new HashMap<>(7);
	private final Board					board		= new Board();

	public static PGNGame parse(Scanner sc) throws ChessException {
		PGNGame game = new PGNGame();

		MatchResult	matchResult;
		Pattern		tagPairPattern	= Pattern.compile("\\[(\\w+) \"(.*)\"]"),
				movePattern = Pattern.compile("\\d+\\. (\\S+)\\s(\\S+)"),
				nagPattern = Pattern.compile("(\\$\\d{1,3})*"),
				terminationMarkerPattern = Pattern.compile("1-0|0-1|1\\/2-1\\/2|\\*");

		// Parse tag pairs
		while (true) {
			if (sc.findInLine(tagPairPattern) != null) {
				matchResult = sc.match();
				if (matchResult.groupCount() == 2) game.setTag(matchResult.group(0), matchResult.group(1));
				else break;
			} else break;
			sc.nextLine();
		}

		// Parse movetext
		while (true) {
			// Skip NAG (Numeric Annotation Glyph)
			sc.skip(nagPattern);

			// TODO: Parse RAV (Recursive Annotation Variation)

			sc.findWithinHorizon(movePattern, 20);
			matchResult = sc.match();
			if (matchResult.groupCount() > 0) for (int i = 1; i < matchResult.groupCount() + 1; i++) {
				game.board.move(matchResult.group(i));
				System.out.println(game.board.toFEN());
			}
			else break;
		}

		// Parse game termination marker
		if (sc.hasNext(terminationMarkerPattern)) {
			sc.next(terminationMarkerPattern);
		} else throw new ChessException("Game termination marker expected");

		return game;
	}

	public String getTag(String tagName) {
		return tagPairs.get(tagName);
	}

	public boolean hasTag(String tagName) {
		return tagPairs.containsKey(tagName);
	}

	public void setTag(String tagName, String tagValue) {
		tagPairs.put(tagName, tagValue);
	}
}