package dev.kske.chess.ui;

import java.awt.Toolkit;
import java.awt.datatransfer.StringSelection;
import java.util.Arrays;

import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;

import dev.kske.chess.board.FENString;
import dev.kske.chess.exception.ChessException;
import dev.kske.chess.game.Game;
import dev.kske.chess.io.EngineUtil;

/**
 * Project: <strong>Chess</strong><br>
 * File: <strong>MenuBar.java</strong><br>
 * Created: <strong>16.07.2019</strong><br>
 *
 * @since Chess v0.1-alpha
 * @author Kai S. K. Engelbart
 */
public class MenuBar extends JMenuBar {

	private static final long serialVersionUID = -7221583703531248228L;

	private final MainWindow mainWindow;

	/**
	 * Creates an instance of {@link MenuBar}.
	 *
	 * @param mainWindow the main window inside which this menu bar is contained
	 */
	public MenuBar(MainWindow mainWindow) {
		this.mainWindow = mainWindow;

		initGameMenu();
		initEngineMenu();
		initToolsMenu();
	}

	private void initGameMenu() {
		JMenu gameMenu = new JMenu("Game");

		JMenuItem newGameMenuItem = new JMenuItem("New Game");
		newGameMenuItem.addActionListener(
			evt -> DialogUtil.showGameConfigurationDialog(
				mainWindow,
				(whiteName, blackName) -> {
					GamePane gamePane = mainWindow.addGamePane();
					Game game = new Game(
						gamePane.getBoardPane(),
						whiteName,
						blackName
					);
					gamePane.setGame(game);
					game.start();
				}
			)
		);
		gameMenu.add(newGameMenuItem);

		JMenuItem loadFileMenu = new JMenuItem("Load game file");
		loadFileMenu.addActionListener(
			evt -> DialogUtil
				.showFileSelectionDialog(
					mainWindow,
					mainWindow::loadFiles,
					Arrays.asList(
						new FileNameExtensionFilter(
							"FEN and PGN files",
							"fen",
							"pgn"
						)
					)
				)
		);
		gameMenu.add(loadFileMenu);

		JMenuItem saveFileMenu = new JMenuItem("Save game file");
		saveFileMenu
			.addActionListener(
				evt -> DialogUtil
					.showFileSaveDialog(
						mainWindow,
						mainWindow::saveFile,
						Arrays.asList(
							new FileNameExtensionFilter("PGN file", "pgn")
						)
					)
			);
		gameMenu.add(saveFileMenu);

		add(gameMenu);
		newGameMenuItem.doClick();
	}

	private void initEngineMenu() {
		JMenu engineMenu = new JMenu("Engine");

		JMenuItem addEngineMenuItem = new JMenuItem("Add engine");
		addEngineMenuItem.addActionListener(evt -> {
			String enginePath = JOptionPane
				.showInputDialog(
					getParent(),
					"Enter the path to a UCI-compatible chess engine:",
					"Engine selection",
					JOptionPane.QUESTION_MESSAGE
				);
			if (enginePath != null)
				EngineUtil.addEngine(enginePath);
		});

		JMenuItem showInfoMenuItem = new JMenuItem("Show engine info");

		engineMenu.add(addEngineMenuItem);
		engineMenu.add(showInfoMenuItem);
		add(engineMenu);
	}

	private void initToolsMenu() {
		JMenu toolsMenu = new JMenu("Tools");

		JMenuItem exportFENMenuItem = new JMenuItem("Export board to FEN");
		exportFENMenuItem.addActionListener(evt -> {
			final String fen = new FENString(
				mainWindow.getSelectedGamePane().getGame().getBoard()
			).toString();
			Toolkit.getDefaultToolkit()
				.getSystemClipboard()
				.setContents(new StringSelection(fen), null);
			JOptionPane.showMessageDialog(
				mainWindow,
				String.format("FEN-string copied to clipboard!%n%s", fen)
			);
		});
		toolsMenu.add(exportFENMenuItem);

		JMenuItem loadFromFENMenuItem = new JMenuItem("Load board from FEN");
		loadFromFENMenuItem.addActionListener(evt -> {
			final GamePane gamePane = mainWindow.addGamePane();
			final String fen
				= JOptionPane.showInputDialog("Enter a FEN string: ");
			DialogUtil.showGameConfigurationDialog(
				mainWindow,
				(whiteName, blackName) -> {
					Game game;
					try {
						game = new Game(
							gamePane.getBoardPane(),
							whiteName,
							blackName,
							new FENString(fen).getBoard()
						);
						gamePane.setGame(game);
						game.start();
					} catch (ChessException e) {
						e.printStackTrace();
						JOptionPane
							.showMessageDialog(
								mainWindow,
								"Failed to load FEN string: " + e.toString(),
								"FEN loading error",
								JOptionPane.ERROR_MESSAGE
							);
					}
				}
			);
		});
		toolsMenu.add(loadFromFENMenuItem);

		add(toolsMenu);
	}
}