"use strict";

// Top-level state and UI manager
globalThis.App = class App {

    // Object constructor
    constructor() {

        // Configure themes
        Bundle.get("app/theme/kiosk.css").style();
        this.themes = {
            dark   : Bundle.get("app/theme/dark.css"   ).style(false),
            light  : Bundle.get("app/theme/light.css"  ).style(true ),
            virtual: Bundle.get("app/theme/virtual.css").style(false)
        };
        this.theme = this.themes["light"];

        // Produce toolkit instance
        this.gui = new Toolkit.Application({
            layout: "grid",
            rows  : "max-content auto"
        });
        document.body.appendChild(this.gui.element);
        window.addEventListener("resize", ()=>{
            this.gui.setSize(window.innerWidth+"px", window.innerHeight+"px");
        });
        window.dispatchEvent(new Event("resize"));

        // Configure locales
        this.gui.addLocale(Bundle.get("app/locale/en-US.js").toString());
        this.gui.setLocale(navigator.language);

        // Menu bar
        this.mainMenu = this.gui.newMenuBar({ name: "{menu._}" });
        this.gui.add(this.mainMenu);
        this.gui.addPropagationListener(e=>this.mainMenu.restoreFocus());

        // File menu
        let menu = this.mainMenu.newMenu({ text: "{menu.file._}"});
        let item = menu.newMenuItem({ text: "{menu.file.loadROM}"});
        item.addClickListener(()=>this.loadROM());

        // Theme menu
        menu = this.mainMenu.newMenu({ text: "{menu.theme._}"});
        item = menu.newMenuItem({ text: "{menu.theme.light}"});
        item.addClickListener(()=>this.setTheme("light"));
        item = menu.newMenuItem({ text: "{menu.theme.dark}"});
        item.addClickListener(()=>this.setTheme("dark"));
        item = menu.newMenuItem({ text: "{menu.theme.virtual}"});
        item.addClickListener(()=>this.setTheme("virtual"));

        // Desktop pane
        let desktop = this.gui.newPanel({ layout: "desktop" });
        desktop.setRole("group");
        desktop.element.setAttribute("desktop", "");
        this.gui.add(desktop);

        let wnd = this.gui.newWindow({
            title: "{memory._}"
        });
        desktop.add(wnd);
        wnd.setLocation  ( 20,  10);
        wnd.setClientSize(384, 224);
    }



    ///////////////////////////// Private Methods /////////////////////////////

    // Prompt the user to select a ROM file
    loadROM() {
        let file  = document.createElement("input");
        file.type = "file";
        file.addEventListener("input", ()=>this.setROM(file.files[0]));
        file.click();
    }

    // Specify a ROM file
    async setROM(file) {

        // No file is specified (perhaps the user canceled)
        if (file == null)
            return;

        // Check the file's size
        if (
            file.size <      1024 ||
            file.size > 0x1000000 ||
            (file.size - 1 & file.size) != 0
        ) {
            alert(this.gui.translate("{app.romNotVB}"));
            return;
        }

        // Load the file data into a byte buffer
        let filename = file.name;
        try { file = new Uint8Array(await file.arrayBuffer()); }
        catch {
            alert(this.gui.translate("{app.readFileError}"));
            return;
        }

        // Testing output pending further features
        alert(this.gui.translate("{app.romLoaded}", {
            filename: filename,
            size    : file.length + " byte" + (file.length == 1 ? "" : "s")
        }));

    }

    // Specify the current color theme
    setTheme(key) {
        let theme = this.themes[key];
        if (theme == this.theme)
            return;
        let old = this.theme;
        this.theme = theme;
        theme.setEnabled(true);
        old.setEnabled(false);
    }

};