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

import ch.bailu.gtk.GTK;
import ch.bailu.gtk.adw.Clamp;
import ch.bailu.gtk.adw.StatusPage;
import ch.bailu.gtk.bridge.ListIndex;
import ch.bailu.gtk.gio.Menu;
import ch.bailu.gtk.glib.Glib;
import ch.bailu.gtk.gtk.*;
import ch.bailu.gtk.type.Str;
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.util.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<InstanceList.Entry> instanceList;
    private final ListIndex instanceListIndex;

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

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

        MenuButton accountsButton = new MenuButton();
        accountsButton.setIconName(new Str("avatar-default-symbolic"));
        accountsButton.setPopover(GtkMenubar.accountsMenu.asPopover());

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

        gridButton = new Button();
        gridButton.setIconName(new Str("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://gitlab.com/jfmods/inceptum/-/issues")));
        uiMenu.button("preferences", () -> {}); //TODO preferences UI inspired by boxes
        uiMenu.button("about", AboutWindow::createAndShow);
        MenuButton menuButton = new MenuButton();
        menuButton.setIconName(new Str("open-menu-symbolic"));
        menuButton.setPopover(uiMenu.asPopover());

        header.packStart(newButton);

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

        instanceList = new ArrayList<>();
        instanceListIndex = new ListIndex();

        listView = new Clamp();
        listView.setMaximumSize(900);
        listView.setChild(new ListView(instanceListIndex.inSelectionModel(), new InstanceListEntryFactory(instanceList)));
        gridView = new GridView(instanceListIndex.inSelectionModel(), new InstanceGridEntryFactory(instanceList));
        empty = new StatusPage();
        empty.setTitle(I18n.str("main.empty.title"));
        empty.setDescription(I18n.str("main.empty.description"));
        //TODO empty.setIconName(new Str());
        stack = new Stack();
        stack.addChild(listView);
        stack.addChild(gridView);

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

        setDefaultSize(360, 720);
        setTitle(new Str("Inceptum"));
        setTitlebar(header);
        setShowMenubar(GTK.FALSE);
        setChild(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(user_data -> {
            //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("instance.json"));
                    }
                }
            }
            if (instancesChanged) generateWindowBody();
            return GTK.TRUE;
        }, null);
        onCloseRequest(() -> {
            try {
                ws.close();
            } catch (IOException ignored) {
            }
            Glib.sourceRemove(source);
            return GTK.FALSE;
        });
    }

    private void generateWindowBody() {
        if (listButton != null) listButton.setVisible(GTK.is(!InceptumConfig.listView));
        if (gridButton != null) gridButton.setVisible(GTK.is(InceptumConfig.listView));
        try {
            instanceList.clear();
            InstanceList.forEach(instanceList::add);
            instanceListIndex.setSize(instanceList.size());

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