Inceptum/launcher-gtk/src/main/java/io/gitlab/jfronny/inceptum/gtk/window/MainWindow.java

package io.gitlab.jfronny.inceptum.gtk.window;

import io.gitlab.jfronny.inceptum.gtk.util.ListIndexModel;
import org.gnome.adw.Clamp;
import org.gnome.adw.StatusPage;
import org.gtk.gio.Menu;
import org.gtk.glib.GLib;
import org.gtk.gtk.*;
import io.gitlab.jfronny.inceptum.common.*;
import io.gitlab.jfronny.inceptum.gtk.GtkMenubar;
import io.gitlab.jfronny.inceptum.gtk.control.InstanceGridEntryFactory;
import io.gitlab.jfronny.inceptum.gtk.control.InstanceListEntryFactory;
import io.gitlab.jfronny.inceptum.gtk.menu.MenuBuilder;
import io.gitlab.jfronny.inceptum.gtk.util.I18n;
import io.gitlab.jfronny.inceptum.launcher.system.instance.Instance;
import io.gitlab.jfronny.inceptum.launcher.system.instance.InstanceList;

import java.io.IOException;
import java.net.URI;
import java.nio.file.*;
import java.util.ArrayList;
import java.util.List;

import static java.nio.file.StandardWatchEventKinds.*;

public class MainWindow extends ApplicationWindow {
    private final Button listButton;
    private final Button gridButton;
    private final Stack stack;
    private final StatusPage empty;
    private final Clamp listView;
    private final GridView gridView;
    private final List<Instance> instanceList;
    private final ListIndexModel instanceListIndex;

    public MainWindow(Application app) {
        super(app);

        HeaderBar header = new HeaderBar();
        Button newButton = new Button();
        newButton.iconName = "list-add-symbolic";
        newButton.onClicked(NewInstanceWindow::createAndShow);

        MenuButton accountsButton = new MenuButton();
        accountsButton.iconName = "avatar-default-symbolic";
        accountsButton.menuModel = GtkMenubar.accountsMenu.menu;

        listButton = new Button();
        listButton.iconName = "view-list-symbolic";
        listButton.onClicked(() -> {
            InceptumConfig.listView = true;
            InceptumConfig.saveConfig();
            generateWindowBody();
        });

        gridButton = new Button();
        gridButton.iconName = "view-grid-symbolic";
        gridButton.onClicked(() -> {
            InceptumConfig.listView = false;
            InceptumConfig.saveConfig();
            generateWindowBody();
        });

        //TODO search button like boxes

        MenuBuilder uiMenu = new MenuBuilder(app, new Menu(), "hamburger");
        uiMenu.button("support", () -> Utils.openWebBrowser(new URI("https://git.frohnmeyer-wds.de/JfMods/Inceptum/issues")));
        uiMenu.button("preferences", () -> {}); //TODO preferences UI inspired by boxes
        uiMenu.button("about", AboutWindow::createAndShow);
        MenuButton menuButton = new MenuButton();
        menuButton.iconName = "open-menu-symbolic";
        menuButton.menuModel = uiMenu.menu;

        header.packStart(newButton);

        header.packEnd(menuButton);
        header.packEnd(gridButton);
        header.packEnd(listButton);
        header.packEnd(accountsButton);

        instanceList = new ArrayList<>();
        instanceListIndex = new ListIndexModel(instanceList.size());
        var singleSelection = new SingleSelection(instanceListIndex);

        listView = new Clamp();
        listView.maximumSize = 900;
        listView.child = new ListView(singleSelection, new InstanceListEntryFactory(instanceList, this));
        listView.child.marginHorizontal = 24;
        listView.child.marginVertical = 12;
        listView.child.addCssClass("content");
        listView.child.valign = Align.START;
        gridView = new GridView(singleSelection, new InstanceGridEntryFactory(instanceList));
        empty = new StatusPage();
        empty.title = I18n.get("main.empty.title");
        empty.description = I18n.get("main.empty.description");
        //TODO empty.setIconName(new Str());
        stack = new Stack();
        stack.addChild(listView);
        stack.addChild(gridView);
        stack.addChild(empty);

        ScrolledWindow scroll = new ScrolledWindow();
        scroll.setPolicy(PolicyType.NEVER, PolicyType.AUTOMATIC);
        scroll.child = stack;

        setDefaultSize(360, 720);
        title = "Inceptum";
        titlebar = header;
        showMenubar = false;
        child = scroll;

        generateWindowBody();
        //TODO DropTarget to add mods/instances

        try {
            setupDirWatcher();
        } catch (IOException e) {
            Utils.LOGGER.error("Could not set up watch service, live updates of the instance dir will be unavailable", e);
        }
    }

    private void setupDirWatcher() throws IOException { //TODO test (including after lock state change)
        WatchService ws = FileSystems.getDefault().newWatchService();
        MetaHolder.INSTANCE_DIR.register(ws, ENTRY_MODIFY, ENTRY_CREATE, ENTRY_DELETE);
        int source = GLib.idleAdd(() -> {
            //TODO watch instance dirs for locks
            WatchKey key = ws.poll();
            boolean instancesChanged = false;
            if (key != null) {
                for (WatchEvent<?> event : key.pollEvents()) {
                    if (event.context() instanceof Path p) {
                        p = MetaHolder.INSTANCE_DIR.resolve(p);
                        instancesChanged |= Files.exists(p.resolve(InstanceList.INSTANCE_CONFIG_NAME));
                    }
                }
            }
            if (instancesChanged) generateWindowBody();
            return true;
        });
        onCloseRequest(() -> {
            try {
                ws.close();
            } catch (IOException ignored) {
            }
            GLib.sourceRemove(source);
            return false;
        });
    }

    private void generateWindowBody() {
        if (listButton != null) listButton.visible = !InceptumConfig.listView;
        if (gridButton != null) gridButton.visible = InceptumConfig.listView;
        try {
            instanceList.clear();
            instanceList.addAll(InstanceList.ordered());
            instanceListIndex.size = instanceList.size();

            if (InstanceList.isEmpty) stack.visibleChild = empty;
            else if (InceptumConfig.listView) stack.visibleChild = listView;
            else stack.visibleChild = gridView;
        } catch (IOException e) {
            Utils.LOGGER.error("Could not generate window body", e);
        }
    }
}