package dev.kske.chess.ui;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

import dev.kske.chess.uci.UCIHandle;
import dev.kske.chess.uci.UCIListener;

/**
 * Project: <strong>Chess</strong><br>
 * File: <strong>MenuBar.java</strong><br>
 * Created: <strong>23.07.2019</strong><br>
 * Author: <strong>Leon Hofmeister</strong>
 */
public class EngineUtil {

	private static volatile List<EngineInfo> engineInfos;

	private static final String engineInfoFile = "engine_infos.ser";

	static {
		loadEngineInfos();
	}

	private EngineUtil() {}

	public static void addEngine(String enginePath) {
		try {
			EngineInfo	info	= new EngineInfo(enginePath);
			UCIHandle	handle	= new UCIHandle(enginePath);
			handle.setListener(new UCIListener() {

				@Override
				public void onIdName(String name) {
					info.name = name;
				}

				@Override
				public void onIdAuthor(String author) {
					info.author = author;
				}

				@Override
				public void onUCIOk() {
					engineInfos.add(info);
					handle.quit();
					saveEngineInfos();
				}
			});
			handle.start();
		} catch (IOException ex) {
			ex.printStackTrace();
		}
	}

	@SuppressWarnings("unchecked")
	private static void loadEngineInfos() {
		try (ObjectInputStream in = new ObjectInputStream(new FileInputStream(engineInfoFile))) {
			Object obj = in.readObject();
			if (obj instanceof ArrayList<?>) engineInfos = (ArrayList<EngineInfo>) obj;
			else throw new IOException("Serialized object has the wrong class.");
		} catch (ClassNotFoundException | IOException ex) {
			engineInfos = new ArrayList<>();
		}
	}

	private static void saveEngineInfos() {
		try (ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(engineInfoFile))) {
			out.writeObject(engineInfos);
		} catch (IOException ex) {
			ex.printStackTrace();
		}
	}

	public static class EngineInfo implements Serializable {

		private static final long serialVersionUID = -474177108900833005L;

		public String path, name, author;

		public EngineInfo(String path) {
			this.path = path;
		}

		@Override
		public String toString() {
			return name + " by " + author + " at " + path;
		}
	}

	public static List<EngineInfo> getEngineInfos() { return engineInfos; }
}