package dev.kske.chess.pgn;

import java.io.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

import dev.kske.chess.exception.ChessException;

/**
 * Project: <strong>Chess</strong><br>
 * File: <strong>PGNDatabase.java</strong><br>
 * Created: <strong>4 Oct 2019</strong><br>
 * <br>
 * Contains a series of {@link PGNGame} objects that can be stored inside a PGN
 * file.
 *
 * @since Chess v0.5-alpha
 * @author Kai S. K. Engelbart
 */
public class PGNDatabase {

	private final List<PGNGame> games = new ArrayList<>();

	/**
	 * Loads PGN games from a file.
	 *
	 * @param pgnFile the file to load the games from
	 * @throws FileNotFoundException if the specified file is not found
	 * @throws ChessException        if an error occurs while parsing the file
	 */
	public void load(File pgnFile)
		throws FileNotFoundException, ChessException {
		try (Scanner sc = new Scanner(pgnFile)) {
			while (sc.hasNext())
				games.add(PGNGame.parse(sc));
		}
	}

	/**
	 * Saves PGN games to a file.
	 *
	 * @param pgnFile the file to save the games to.
	 * @throws IOException if the file could not be created
	 */
	public void save(File pgnFile) throws IOException {
		pgnFile.getParentFile().mkdirs();
		try (PrintWriter pw = new PrintWriter(pgnFile)) {
			games.forEach(g -> g.writePGN(pw));
		}
	}

	/**
	 * @return all games contained inside this database
	 */
	public List<PGNGame> getGames() { return games; }
}