import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.Files;
import java.util.Locale;
import java.util.jar.JarFile;
import java.util.regex.Pattern;
import java.util.zip.ZipEntry;

public class NotSkyblockAddonsInstallerFrame extends JFrame implements ActionListener, MouseListener {
	private static final Pattern IN_MODS_SUBFOLDER = Pattern.compile("1\\.8\\.9[/\\\\]?$");

	private JLabel logo = null;
	private JLabel versionInfo = null;
	private JLabel labelFolder = null;

	private JPanel panelCenter = null;
	private JPanel panelBottom = null;
	private JPanel totalContentPane = null;

	private JTextArea descriptionText = null;
	private JTextArea forgeDescriptionText = null;

	private JTextField textFieldFolderLocation = null;
	private JButton buttonChooseFolder = null;

	private JButton buttonInstall = null;
	private JButton buttonOpenFolder = null;
	private JButton buttonClose = null;

	private static final int TOTAL_HEIGHT = 435;
	private static final int TOTAL_WIDTH = 404;

	private int x = 0;
	private int y = 0;

	private int w = TOTAL_WIDTH;
	private int h;
	private int margin;

	public NotSkyblockAddonsInstallerFrame() {
		try {
			setName("NotEnoughUpdatesInstallerFrame");
			setTitle("NotEnoughUpdates Installer");
			setResizable(false);
			setSize(TOTAL_WIDTH, TOTAL_HEIGHT);
			setContentPane(getPanelContentPane());

			getButtonFolder().addActionListener(this);
			getButtonInstall().addActionListener(this);
			getButtonOpenFolder().addActionListener(this);
			getButtonClose().addActionListener(this);
			getForgeTextArea().addMouseListener(this);

			pack();
			setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

			getFieldFolder().setText(getModsFolder().getPath());
			getButtonInstall().setEnabled(true);
			getButtonInstall().requestFocus();
		} catch (Exception ex) {
			showErrorPopup(ex);
		}
	}

	public static void main(String[] args) {
		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
			NotSkyblockAddonsInstallerFrame frame = new NotSkyblockAddonsInstallerFrame();
			frame.centerFrame(frame);
			frame.show();

		} catch (Exception ex) {
			showErrorPopup(ex);
		}
	}

	private JPanel getPanelContentPane() {
		if (totalContentPane == null) {
			try {
				totalContentPane = new JPanel();
				totalContentPane.setName("PanelContentPane");
				totalContentPane.setLayout(new BorderLayout(5, 5));
				totalContentPane.setPreferredSize(new Dimension(TOTAL_WIDTH, TOTAL_HEIGHT));
				totalContentPane.add(getPanelCenter(), "Center");
				totalContentPane.add(getPanelBottom(), "South");
			} catch (Throwable ivjExc) {
				showErrorPopup(ivjExc);
			}
		}
		return totalContentPane;
	}

	private JPanel getPanelCenter() {
		if (panelCenter == null) {
			try {
				(panelCenter = new JPanel()).setName("PanelCenter");
				panelCenter.setLayout(null);
				panelCenter.add(getPictureLabel(), getPictureLabel().getName());
				panelCenter.add(getVersionInfo(), getVersionInfo().getName());
				panelCenter.add(getTextArea(), getTextArea().getName());
				panelCenter.add(getForgeTextArea(), getForgeTextArea().getName());
				panelCenter.add(getLabelFolder(), getLabelFolder().getName());
				panelCenter.add(getFieldFolder(), getFieldFolder().getName());
				panelCenter.add(getButtonFolder(), getButtonFolder().getName());
			} catch (Throwable ivjExc) {
				showErrorPopup(ivjExc);
			}
		}
		return panelCenter;
	}

	private JLabel getPictureLabel() {
		if (logo == null) {
			try {
				h = w / 2;
				margin = 5;

				BufferedImage myPicture = ImageIO.read(getClass()
					.getClassLoader()
					.getResourceAsStream("assets/notenoughupdates/logo.png"));
				Image scaled = myPicture.getScaledInstance(w - margin * 2, h - margin, Image.SCALE_SMOOTH);
				logo = new JLabel(new ImageIcon(scaled));
				logo.setName("Logo");
				logo.setBounds(x + margin, y + margin, w - margin * 2, h - margin);
				logo.setFont(new Font(Font.DIALOG, Font.BOLD, 18));
				logo.setHorizontalAlignment(SwingConstants.CENTER);
				logo.setPreferredSize(new Dimension(h * 742 / 537, h));

				y += h;
			} catch (Throwable ivjExc) {
				showErrorPopup(ivjExc);
			}
		}
		return logo;
	}

	private JLabel getVersionInfo() {
		if (versionInfo == null) {
			try {
				h = 25;

				versionInfo = new JLabel();
				versionInfo.setName("LabelMcVersion");
				versionInfo.setBounds(x, y, w, h);
				versionInfo.setFont(new Font(Font.DIALOG, Font.BOLD, 14));
				versionInfo.setHorizontalAlignment(SwingConstants.CENTER);
				versionInfo.setPreferredSize(new Dimension(w, h));
				versionInfo.setText("NEU by Moulberry, Installer by Biscuit - for Minecraft 1.8.9");

				y += h;
			} catch (Throwable ivjExc) {
				showErrorPopup(ivjExc);
			}
		}
		return versionInfo;
	}

	private JTextArea getTextArea() {
		if (descriptionText == null) {
			try {
				h = 60;
				margin = 10;

				descriptionText = new JTextArea();
				descriptionText.setName("TextArea");
				descriptionText.setBounds(x + margin, y + margin, w - margin * 2, h - margin);
				descriptionText.setEditable(false);
				descriptionText.setHighlighter(null);
				descriptionText.setEnabled(true);
				descriptionText.setFont(new Font(Font.DIALOG, Font.PLAIN, 12));
				descriptionText.setLineWrap(true);
				descriptionText.setOpaque(false);
				descriptionText.setPreferredSize(new Dimension(w - margin * 2, h - margin));
				descriptionText.setText(
					"This installer will copy NotEnoughUpdates into your forge mods folder for you, and replace any old versions that already exist. " +
						"Close this if you prefer to do this yourself!");
				descriptionText.setWrapStyleWord(true);

				y += h;
			} catch (Throwable ivjExc) {
				showErrorPopup(ivjExc);
			}
		}
		return descriptionText;
	}

	private JTextArea getForgeTextArea() {
		if (forgeDescriptionText == null) {
			try {
				h = 55;
				margin = 10;

				forgeDescriptionText = new JTextArea();
				forgeDescriptionText.setName("TextAreaForge");
				forgeDescriptionText.setBounds(x + margin, y + margin, w - margin * 2, h - margin);
				forgeDescriptionText.setEditable(false);
				forgeDescriptionText.setHighlighter(null);
				forgeDescriptionText.setEnabled(true);
				forgeDescriptionText.setFont(new Font(Font.DIALOG, Font.PLAIN, 12));
				forgeDescriptionText.setLineWrap(true);
				forgeDescriptionText.setOpaque(false);
				forgeDescriptionText.setPreferredSize(new Dimension(w - margin * 2, h - margin));
				forgeDescriptionText.setText(
					"However, you still need to install Forge client in order to be able to run this mod. Click here to visit the download page for Forge 1.8.9!");
				forgeDescriptionText.setForeground(Color.BLUE.darker());
				forgeDescriptionText.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
				forgeDescriptionText.setWrapStyleWord(true);

				y += h;
			} catch (Throwable ivjExc) {
				showErrorPopup(ivjExc);
			}
		}
		return forgeDescriptionText;
	}

	private JLabel getLabelFolder() {
		if (labelFolder == null) {
			h = 16;
			w = 65;

			x += 10; // Padding

			try {
				labelFolder = new JLabel();
				labelFolder.setName("LabelFolder");
				labelFolder.setBounds(x, y + 2, w, h);
				labelFolder.setPreferredSize(new Dimension(w, h));
				labelFolder.setText("Mods Folder");
			} catch (Throwable ivjExc) {
				showErrorPopup(ivjExc);
			}

			x += w;
		}
		return labelFolder;
	}

	private JTextField getFieldFolder() {
		if (textFieldFolderLocation == null) {
			h = 20;
			w = 287;

			try {
				textFieldFolderLocation = new JTextField();
				textFieldFolderLocation.setName("FieldFolder");
				textFieldFolderLocation.setBounds(x, y, w, h);
				textFieldFolderLocation.setEditable(false);
				textFieldFolderLocation.setPreferredSize(new Dimension(w, h));
			} catch (Throwable ivjExc) {
				showErrorPopup(ivjExc);
			}

			x += w;
		}
		return textFieldFolderLocation;
	}

	private JButton getButtonFolder() {
		if (buttonChooseFolder == null) {
			h = 20;
			w = 25;

			x += 10; // Padding

			try {
				BufferedImage myPicture = ImageIO.read(getClass()
					.getClassLoader()
					.getResourceAsStream("assets/notenoughupdates/folder.png"));
				Image scaled = myPicture.getScaledInstance(w - 8, h - 6, Image.SCALE_SMOOTH);
				buttonChooseFolder = new JButton(new ImageIcon(scaled));
				buttonChooseFolder.setName("ButtonFolder");
				buttonChooseFolder.setBounds(x, y, w, h);
				buttonChooseFolder.setPreferredSize(new Dimension(w, h));
			} catch (Throwable ivjExc) {
				showErrorPopup(ivjExc);
			}
		}
		return buttonChooseFolder;
	}

	private JPanel getPanelBottom() {
		if (panelBottom == null) {
			try {
				panelBottom = new JPanel();
				panelBottom.setName("PanelBottom");
				panelBottom.setLayout(new FlowLayout(FlowLayout.CENTER, 15, 10));
				panelBottom.setPreferredSize(new Dimension(390, 55));
				panelBottom.add(getButtonInstall(), getButtonInstall().getName());
				panelBottom.add(getButtonOpenFolder(), getButtonOpenFolder().getName());
				panelBottom.add(getButtonClose(), getButtonClose().getName());
			} catch (Throwable ivjExc) {
				showErrorPopup(ivjExc);
			}
		}
		return panelBottom;
	}

	private JButton getButtonInstall() {
		if (buttonInstall == null) {
			w = 100;
			h = 26;

			try {
				buttonInstall = new JButton();
				buttonInstall.setName("ButtonInstall");
				buttonInstall.setPreferredSize(new Dimension(w, h));
				buttonInstall.setText("Install");
			} catch (Throwable ivjExc) {
				showErrorPopup(ivjExc);
			}
		}
		return buttonInstall;
	}

	private JButton getButtonOpenFolder() {
		if (buttonOpenFolder == null) {
			w = 130;
			h = 26;

			try {
				buttonOpenFolder = new JButton();
				buttonOpenFolder.setName("ButtonOpenFolder");
				buttonOpenFolder.setPreferredSize(new Dimension(w, h));
				buttonOpenFolder.setText("Open Mods Folder");
			} catch (Throwable ivjExc) {
				showErrorPopup(ivjExc);
			}
		}
		return buttonOpenFolder;
	}

	private JButton getButtonClose() {
		if (buttonClose == null) {
			w = 100;
			h = 26;

			try {
				(buttonClose = new JButton()).setName("ButtonClose");
				buttonClose.setPreferredSize(new Dimension(w, h));
				buttonClose.setText("Cancel");
			} catch (Throwable ivjExc) {
				showErrorPopup(ivjExc);
			}
		}
		return buttonClose;
	}

	public void onFolderSelect() {
		File currentDirectory = new File(getFieldFolder().getText());

		JFileChooser jFileChooser = new JFileChooser(currentDirectory);
		jFileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
		jFileChooser.setAcceptAllFileFilterUsed(false);
		if (jFileChooser.showOpenDialog(this) == 0) {
			File newDirectory = jFileChooser.getSelectedFile();
			getFieldFolder().setText(newDirectory.getPath());
		}
	}

	@Override
	public void actionPerformed(ActionEvent e) {
		if (e.getSource() == getButtonClose()) {
			dispose();
			System.exit(0);
		}
		if (e.getSource() == getButtonFolder()) {
			onFolderSelect();
		}
		if (e.getSource() == getButtonInstall()) {
			onInstall();
		}
		if (e.getSource() == getButtonOpenFolder()) {
			onOpenFolder();
		}
	}

	@Override
	public void mouseClicked(MouseEvent e) {
		if (e.getSource() == getForgeTextArea()) {
			try {
				Desktop.getDesktop().browse(new URI(
					"http://files.minecraftforge.net/maven/net/minecraftforge/forge/index_1.8.9.html"));
			} catch (IOException | URISyntaxException ex) {
				showErrorPopup(ex);
			}
		}
	}

	public void onInstall() {
		try {
			File modsFolder = new File(getFieldFolder().getText());
			if (!modsFolder.exists()) {
				showErrorMessage("Folder not found: " + modsFolder.getPath());
				return;
			}
			if (!modsFolder.isDirectory()) {
				showErrorMessage("Not a folder: " + modsFolder.getPath());
				return;
			}
			tryInstall(modsFolder);
		} catch (Exception e) {
			showErrorPopup(e);
		}
	}

	private void tryInstall(File modsFolder) {
		File thisFile = getThisFile();

		if (thisFile != null) {
			boolean inSubFolder = IN_MODS_SUBFOLDER.matcher(modsFolder.getPath()).find();

			boolean deletingFailure = false;
			if (modsFolder.isDirectory()) { // Delete in this current folder.
				boolean failed = findSkyblockAddonsAndDelete(modsFolder.listFiles());
				if (failed) deletingFailure = true;
			}
			if (inSubFolder) { // We are in the 1.8.9 folder, delete in the parent folder as well.
				if (modsFolder.getParentFile().isDirectory()) {
					boolean failed = findSkyblockAddonsAndDelete(modsFolder.getParentFile().listFiles());
					if (failed) deletingFailure = true;
				}
			} else { // We are in the main mods folder, but the 1.8.9 subfolder exists... delete in there too.
				File subFolder = new File(modsFolder, "1.8.9");
				if (subFolder.exists() && subFolder.isDirectory()) {
					boolean failed = findSkyblockAddonsAndDelete(subFolder.listFiles());
					if (failed) deletingFailure = true;
				}
			}

			if (deletingFailure) return;

			if (thisFile.isDirectory()) {
				showErrorMessage("This file is a directory... Are we in a development environment?");
				return;
			}

			try {
				Files.copy(thisFile.toPath(), new File(modsFolder, thisFile.getName()).toPath());
			} catch (Exception ex) {
				showErrorPopup(ex);
				return;
			}

			showMessage("NotEnoughUpdates has been successfully installed into your mods folder.");
			dispose();
			System.exit(0);
		}
	}

	private boolean findSkyblockAddonsAndDelete(File[] files) {
		if (files == null) return false;

		for (File file : files) {
			if (!file.isDirectory() && file.getPath().endsWith(".jar")) {
				try {
					JarFile jarFile = new JarFile(file);
					ZipEntry mcModInfo = jarFile.getEntry("mcmod.info");
					if (mcModInfo != null) {
						InputStream inputStream = jarFile.getInputStream(mcModInfo);
						String modID = getModIDFromInputStream(inputStream);
						if (modID.equals("notenoughupdates")) {
							jarFile.close();
							try {
								boolean deleted = file.delete();
								if (!deleted) {
									throw new Exception();
								}
							} catch (Exception ex) {
								ex.printStackTrace();
								showErrorMessage("Was not able to delete the other NotEnoughUpdates files found in your mods folder!" +
									System.lineSeparator() +
									"Please make sure that your minecraft is currently closed and try again, or feel" +
									System.lineSeparator() +
									"free to open your mods folder and delete those files manually.");
								return true;
							}
							continue;
						}
					}
					jarFile.close();
				} catch (Exception ex) {
					// Just don't check the file I guess, move on to the next...
				}
			}
		}
		return false;
	}

	public void onOpenFolder() {
		try {
			Desktop.getDesktop().open(getModsFolder());
		} catch (Exception e) {
			showErrorPopup(e);
		}
	}

	public File getModsFolder() {
		String userHome = System.getProperty("user.home", ".");

		File modsFolder = getFile(userHome, "minecraft/mods/1.8.9");
		if (!modsFolder.exists()) {
			modsFolder = getFile(userHome, "minecraft/mods");
		}

		if (!modsFolder.exists() && !modsFolder.mkdirs()) {
			throw new RuntimeException("The working directory could not be created: " + modsFolder);
		}
		return modsFolder;
	}

	public File getFile(String userHome, String minecraftPath) {
		File workingDirectory;
		switch (getOperatingSystem()) {
			case LINUX:
			case SOLARIS: {
				workingDirectory = new File(userHome, '.' + minecraftPath + '/');
				break;
			}
			case WINDOWS: {
				String applicationData = System.getenv("APPDATA");
				if (applicationData != null) {
					workingDirectory = new File(applicationData, "." + minecraftPath + '/');
					break;
				}
				workingDirectory = new File(userHome, '.' + minecraftPath + '/');
				break;
			}
			case MACOS: {
				workingDirectory = new File(userHome, "Library/Application Support/" + minecraftPath);
				break;
			}
			default: {
				workingDirectory = new File(userHome, minecraftPath + '/');
				break;
			}
		}
		return workingDirectory;
	}

	public OperatingSystem getOperatingSystem() {
		String osName = System.getProperty("os.name").toLowerCase(Locale.US);
		if (osName.contains("win")) {
			return OperatingSystem.WINDOWS;

		} else if (osName.contains("mac")) {
			return OperatingSystem.MACOS;

		} else if (osName.contains("solaris") || osName.contains("sunos")) {

			return OperatingSystem.SOLARIS;
		} else if (osName.contains("linux") || osName.contains("unix")) {

			return OperatingSystem.LINUX;
		}
		return OperatingSystem.UNKNOWN;
	}

	public void centerFrame(JFrame frame) {
		Rectangle rectangle = frame.getBounds();
		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
		Rectangle screenRectangle = new Rectangle(0, 0, screenSize.width, screenSize.height);

		int newX = screenRectangle.x + (screenRectangle.width - rectangle.width) / 2;
		int newY = screenRectangle.y + (screenRectangle.height - rectangle.height) / 2;

		if (newX < 0) newX = 0;
		if (newY < 0) newY = 0;

		frame.setBounds(newX, newY, rectangle.width, rectangle.height);
	}

	public void showMessage(String message) {
		JOptionPane.showMessageDialog(null, message, "NotEnoughUpdates", JOptionPane.INFORMATION_MESSAGE);
	}

	public void showErrorMessage(String message) {
		JOptionPane.showMessageDialog(null, message, "NotEnoughUpdates - Error", JOptionPane.ERROR_MESSAGE);
	}

	public enum OperatingSystem {
		LINUX,
		SOLARIS,
		WINDOWS,
		MACOS,
		UNKNOWN
	}

	private static String getStacktraceText(Throwable ex) {
		StringWriter stringWriter = new StringWriter();
		ex.printStackTrace(new PrintWriter(stringWriter));
		return stringWriter.toString().replace("\t", "  ");
	}

	private static void showErrorPopup(Throwable ex) {
		ex.printStackTrace();

		JTextArea textArea = new JTextArea(getStacktraceText(ex));
		textArea.setEditable(false);
		Font currentFont = textArea.getFont();
		Font newFont = new Font(Font.MONOSPACED, currentFont.getStyle(), currentFont.getSize());
		textArea.setFont(newFont);

		JScrollPane errorScrollPane = new JScrollPane(textArea);
		errorScrollPane.setPreferredSize(new Dimension(600, 400));
		JOptionPane.showMessageDialog(null, errorScrollPane, "Error", JOptionPane.ERROR_MESSAGE);
	}

	private String getVersionFromMcmodInfo() {
		String version = "";
		try {
			BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(getClass()
				.getClassLoader()
				.getResourceAsStream("mcmod.info")));
			while ((version = bufferedReader.readLine()) != null) {
				if (version.contains("\"version\": \"")) {
					version = version.split(Pattern.quote("\"version\": \""))[1];
					version = version.substring(0, version.length() - 2);
					break;
				}
			}
		} catch (Exception ex) {
			// It's okay, I guess just don't use the version lol.
		}
		return version;
	}

	private String getModIDFromInputStream(InputStream inputStream) {
		String version = "";
		try {
			BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
			while ((version = bufferedReader.readLine()) != null) {
				if (version.contains("\"modid\": \"")) {
					version = version.split(Pattern.quote("\"modid\": \""))[1];
					version = version.substring(0, version.length() - 2);
					break;
				}
			}
		} catch (Exception ex) {
			// RIP, couldn't find the modid...
		}
		return version;
	}

	private File getThisFile() {
		try {
			return new File(NotSkyblockAddonsInstallerFrame.class
				.getProtectionDomain()
				.getCodeSource()
				.getLocation()
				.toURI());
		} catch (URISyntaxException ex) {
			showErrorPopup(ex);
		}
		return null;
	}

	@Override
	public void mousePressed(MouseEvent e) {}

	@Override
	public void mouseReleased(MouseEvent e) {}

	@Override
	public void mouseEntered(MouseEvent e) {}

	@Override
	public void mouseExited(MouseEvent e) {}
}