package be.nikiroo.jvcard.tui;

import java.io.File;
import java.io.IOException;
import java.lang.reflect.Field;
import java.nio.charset.Charset;
import java.util.LinkedList;
import java.util.List;

import be.nikiroo.jvcard.i18n.Trans;
import be.nikiroo.jvcard.i18n.Trans.StringId;
import be.nikiroo.jvcard.tui.panes.FileList;

import com.googlecode.lanterna.gui2.Window;
import com.googlecode.lanterna.input.KeyStroke;

/**
 * This class contains the runnable Main method. It will parse the user supplied
 * parameters and take action based upon those. Most of the time, it will start
 * a MainWindow.
 * 
 * @author niki
 *
 */
public class Main {
	public static final String APPLICATION_TITLE = "jVcard";
	public static final String APPLICATION_VERSION = "1.0-beta2";

	static private Trans transService;

	/**
	 * Translate the given {@link StringId}.
	 * 
	 * @param id
	 *            the ID to translate
	 * 
	 * @return the translation
	 */
	static public String trans(StringId id) {
		if (transService == null)
			return "";

		return transService.trans(id);
	}

	/**
	 * Translate the given {@link KeyStroke}.
	 * 
	 * @param key
	 *            the key to translate
	 * 
	 * @return the translation
	 */
	static public String trans(KeyStroke key) {
		if (transService == null)
			return "";

		return transService.trans(key);
	}

	/**
	 * Start the application.
	 * 
	 * @param args
	 *            the parameters (see --help to know hich are supported)
	 */
	public static void main(String[] args) {
		Boolean textMode = null;
		boolean noMoreParams = false;
		boolean filesTried = false;

		// get the "system default" language to help translate the --help
		// message if needed
		String language = null;
		transService = new Trans(null);

		List<File> files = new LinkedList<File>();
		for (int index = 0; index < args.length; index++) {
			String arg = args[index];
			if (!noMoreParams && arg.equals("--")) {
				noMoreParams = true;
			} else if (!noMoreParams && arg.equals("--help")) {
				System.out
						.println("TODO: implement some help text.\n"
								+ "Usable switches:\n"
								+ "\t--: stop looking for switches\n"
								+ "\t--help: this here thingy\n"
								+ "\t--lang LANGUAGE: choose the language, for instance en_GB\n"
								+ "\t--tui: force pure text mode even if swing treminal is available\n"
								+ "\t--gui: force swing terminal mode\n"
								+ "\t--noutf: force non-utf8 mode if you need it\n"
								+ "everyhing else is either a file to open or a directory to open\n"
								+ "(we will only open 1st level files in given directories)");
				return;
			} else if (!noMoreParams && arg.equals("--tui")) {
				textMode = true;
			} else if (!noMoreParams && arg.equals("--gui")) {
				textMode = false;
			} else if (!noMoreParams && arg.equals("--noutf")) {
				UiColors.getInstance().setUnicode(false);
			} else if (!noMoreParams && arg.equals("--lang")) {
				index++;
				if (index < args.length)
					language = args[index];
				transService = new Trans(language);
			} else {
				filesTried = true;
				files.addAll(open(arg));
			}
		}

		if (UiColors.getInstance().isUnicode()) {
			utf8();
		}

		if (files.size() == 0) {
			if (filesTried) {
				System.exit(1);
				return;
			}

			files.addAll(open("."));
		}

		Window win = new MainWindow(new FileList(files));

		try {
			TuiLauncher.start(textMode, win);
		} catch (IOException ioe) {
			ioe.printStackTrace();
			System.exit(2);
		}
	}

	/**
	 * Open the given path and add all its files if it is a directory or just
	 * this one if not to the returned list.
	 * 
	 * @param path
	 *            the path to open
	 * 
	 * @return the list of opened files
	 */
	static private List<File> open(String path) {
		List<File> files = new LinkedList<File>();

		File file = new File(path);
		if (file.exists()) {
			if (file.isDirectory()) {
				for (File subfile : file.listFiles()) {
					if (!subfile.isDirectory())
						files.add(subfile);
				}
			} else {
				files.add(file);
			}
		} else {
			System.err.println("File or directory not found: \"" + path + "\"");
		}

		return files;
	}

	/**
	 * Really, really ask for UTF-8 encoding.
	 */
	static private void utf8() {
		try {
			System.setProperty("file.encoding", "UTF-8");
			Field charset = Charset.class.getDeclaredField("defaultCharset");
			charset.setAccessible(true);
			charset.set(null, null);
		} catch (SecurityException e) {
		} catch (NoSuchFieldException e) {
		} catch (IllegalArgumentException e) {
		} catch (IllegalAccessException e) {
		}
	}
}