package net.knarcraft.minecraftserverlauncher.userinterface;

import net.knarcraft.minecraftserverlauncher.profile.Profile;
import net.knarcraft.minecraftserverlauncher.profile.ServerLauncherController;
import net.knarcraft.minecraftserverlauncher.utility.CommonFunctions;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Objects;

/**
 * This class takes care of the GUI's top menu
 */
public class ServerLauncherMenu implements ActionListener {

    private final JMenuBar menuBar;
    //Options
    private JCheckBoxMenuItem runInBackgroundCheckBoxMenuItem;
    private JCheckBoxMenuItem delayStartupCheckBoxMenuItem;
    private JCheckBoxMenuItem downloadJarsCheckBoxMenuItem;
    private JMenuItem javaCommandMenuItem;
    private JMenuItem oldJavaCommandMenuItem;
    //Help
    private JMenuItem errorsMenuItem;
    private JMenuItem setupMenuItem;
    private JMenuItem manualUpdateMenuItem;
    //Info/options
    private JMenuItem runInBackgroundMenuItem;
    private JMenuItem delayStartupMenuItem;
    private JMenuItem downloadJarsMenuItem;
    private JMenuItem javaCommandInfoMenuItem;
    private JMenuItem oldJavaCommandInfoMenuItem;
    //Info/about
    private JMenuItem aboutMenuItem;
    private JMenuItem storyMenuItem;

    private final ServerLauncherController controller;
    private final ServerLauncherGUI serverLauncherGUI;

    /**
     * Initializes a new server launcher menu
     *
     * @param menuBar           <p>The menu bar to attach items to</p>
     * @param serverLauncherGUI <p>The server launcher GUI to use</p>
     */
    public ServerLauncherMenu(JMenuBar menuBar, ServerLauncherGUI serverLauncherGUI) {
        this.controller = ServerLauncherController.getInstance();
        this.menuBar = menuBar;
        this.serverLauncherGUI = serverLauncherGUI;
        initialize();
    }

    /**
     * Initializes all GUI elements
     */
    public void initialize() {
        JMenu mnOptions = new JMenu("Options");
        menuBar.add(mnOptions);
        generateOptionsMenuItems(mnOptions);

        JMenu mnHelp = new JMenu("Help");
        menuBar.add(mnHelp);

        errorsMenuItem = createMenuItem("Errors", mnHelp);
        setupMenuItem = createMenuItem("Setup", mnHelp);
        manualUpdateMenuItem = createMenuItem("Manual update", mnHelp);

        JMenu mnInfo = new JMenu("Info");
        menuBar.add(mnInfo);
        generateInfoMenuItems(mnInfo);
    }

    /**
     * Updates the state of checkboxes based on whether options are enabled
     */
    public void update() {
        runInBackgroundCheckBoxMenuItem.setState(controller.getRunInBackground());
        delayStartupCheckBoxMenuItem.setState(controller.getDelayStartup() > 0);
        downloadJarsCheckBoxMenuItem.setState(controller.getDownloadAllJars());
    }

    @Override
    public void actionPerformed(ActionEvent actionEvent) {
        Object actionSource = actionEvent.getSource();
        if (actionSource == runInBackgroundCheckBoxMenuItem) {
            background();
        } else if (actionSource == delayStartupCheckBoxMenuItem) {
            delay();
        } else if (actionSource == downloadJarsCheckBoxMenuItem) {
            downloadJars();
        } else if (actionSource == javaCommandMenuItem) {
            configureJava(false);
        } else if (actionSource == oldJavaCommandMenuItem) {
            configureJava(true);
        } else if (actionSource == errorsMenuItem) {
            CommonFunctions.goToURL(serverLauncherGUI.getMessage("infoURL"));
        } else if (actionSource == setupMenuItem) {
            serverLauncherGUI.showMessage("Setup", serverLauncherGUI.getMessage("setupText"));
        } else if (actionSource == manualUpdateMenuItem) {
            CommonFunctions.goToURL(serverLauncherGUI.getMessage("manualUpdateURL"));
        } else if (actionSource == runInBackgroundMenuItem) {
            serverLauncherGUI.showMessage("Run in background", serverLauncherGUI.getMessage("runInBackgroundText"));
        } else if (actionSource == delayStartupMenuItem) {
            serverLauncherGUI.showMessage("Delay startup", serverLauncherGUI.getMessage("delayStartupText"));
        } else if (actionSource == downloadJarsMenuItem) {
            serverLauncherGUI.showMessage("Download jars", serverLauncherGUI.getMessage("downloadJarsText"));
        } else if (actionSource == javaCommandInfoMenuItem) {
            serverLauncherGUI.showMessage("Java command", serverLauncherGUI.getMessage("javaCommandText"));
        } else if (actionSource == oldJavaCommandInfoMenuItem) {
            serverLauncherGUI.showMessage("Old Java command", serverLauncherGUI.getMessage("oldJavaCommandText"));
        } else if (actionSource == aboutMenuItem) {
            serverLauncherGUI.showMessage("About", serverLauncherGUI.getMessage("aboutText"));
        } else if (actionSource == storyMenuItem) {
            CommonFunctions.goToURL(serverLauncherGUI.getMessage("storyURL"));
        }
    }

    /**
     * Generates the children of the options menu
     *
     * @param mnOptions <p>A reference to the options menu</p>
     */
    private void generateOptionsMenuItems(JMenu mnOptions) {
        runInBackgroundCheckBoxMenuItem = createCheckBoxMenuItem("Run in background on exit", mnOptions);
        delayStartupCheckBoxMenuItem = createCheckBoxMenuItem("Delay Startup", mnOptions);
        downloadJarsCheckBoxMenuItem = createCheckBoxMenuItem("Download jars", mnOptions);
        javaCommandMenuItem = createMenuItem("Java command", mnOptions);
        oldJavaCommandMenuItem = createMenuItem("Old Java command", mnOptions);
    }

    /**
     * Generates the children of the info menu
     *
     * @param mnInfo <p>A reference to the info menu</p>
     */
    private void generateInfoMenuItems(JMenu mnInfo) {
        JMenu mnOptionsInfo = new JMenu("Options");
        mnInfo.add(mnOptionsInfo);

        runInBackgroundMenuItem = createMenuItem("Run in background on exit", mnOptionsInfo);
        delayStartupMenuItem = createMenuItem("Delay Startup", mnOptionsInfo);
        downloadJarsMenuItem = createMenuItem("Download jars", mnOptionsInfo);
        javaCommandInfoMenuItem = createMenuItem("Java command", mnOptionsInfo);
        oldJavaCommandInfoMenuItem = createMenuItem("Old Java command", mnOptionsInfo);

        JMenu mnAbout = new JMenu("About");
        mnInfo.add(mnAbout);

        aboutMenuItem = createMenuItem("About", mnAbout);
        storyMenuItem = createMenuItem("Story", mnAbout);
    }

    /**
     * Creates a checkbox menu item
     *
     * @param itemName <p>The name of the new checkbox item</p>
     * @param parent <p>The parent menu the item belongs to</p>
     * @return <p>The created checkbox menu item</p>
     */
    private JCheckBoxMenuItem createCheckBoxMenuItem(String itemName, JMenu parent) {
        JCheckBoxMenuItem menuItem = new JCheckBoxMenuItem(itemName);
        parent.add(menuItem);
        menuItem.addActionListener(this);
        return menuItem;
    }

    /**
     * Creates a menu item
     *
     * @param itemName <p>The name of the new item</p>
     * @param parent <p>The parent menu the item belongs to</p>
     * @return <p>The created menu item</p>
     */
    private JMenuItem createMenuItem(String itemName, JMenu parent) {
        JMenuItem menuItem = new JMenuItem(itemName);
        parent.add(menuItem);
        menuItem.addActionListener(this);
        return menuItem;
    }

    /**
     * Asks the user for the new Java path
     * @param old <p>Whether asking for the path to the old java version</p>
     */
    private void configureJava(boolean old) {
        if (old) {
            String response = JOptionPane.showInputDialog("Command or path to Java: ", controller.getOldJavaCommand());
            if (response != null) {
                controller.setOldJavaCommand(response);
            }
        } else {
            String response = JOptionPane.showInputDialog("Command or path to Java: ", controller.getJavaCommand());
            if (response != null) {
                controller.setJavaCommand(response);
            }
        }
    }

    /**
     * Asks the user for a delay if checked, and sets the value to the current profile
     */
    private void delay() {
        String selectedProfile = serverLauncherGUI.getSelectedProfile();
        if (selectedProfile != null) {
            Profile profile = controller.getProfileByName(selectedProfile);
            if (delayStartupCheckBoxMenuItem.isSelected()) {
                String response = JOptionPane.showInputDialog("Seconds to delay: ");
                if (response == null) {
                    delayStartupCheckBoxMenuItem.setState(false);
                    return;
                }
                int parsed = Integer.parseInt(response);
                Objects.requireNonNull(profile).setDelayStartup(parsed);
            } else {
                Objects.requireNonNull(profile).setDelayStartup(0);
            }
        } else {
            serverLauncherGUI.showError("No profile selected");
        }
    }

    /**
     * Saves the runInBackground setting to the current profile
     */
    private void background() {
        String selectedProfile = serverLauncherGUI.getSelectedProfile();
        if (selectedProfile != null) {
            Profile profile = controller.getProfileByName(selectedProfile);
            Objects.requireNonNull(profile).setRunInBackground(runInBackgroundCheckBoxMenuItem.isSelected());
        } else {
            serverLauncherGUI.showError("No profile selected");
        }
    }

    /**
     * Saves the downloadJars setting to the current profile
     */
    private void downloadJars() {
        String selectedProfile = serverLauncherGUI.getSelectedProfile();
        if (selectedProfile != null) {
            controller.setDownloadAllJars(downloadJarsCheckBoxMenuItem.isSelected());
        } else {
            serverLauncherGUI.showError("No profile selected");
        }
    }
}