"use strict";

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

    // Produce a new class instance
    static async create() {
        let ret = new App();
        await ret.init();
        return ret;
    }

    // Perform initial tasks
    async init() {

        // Initialization tasks
        this.initEnv();
        this.initMenus();

        // WebAssembly core module
        this.core = new Worker(Bundle.get("app/Emulator.js").toDataURL());
        await new Promise((resolve,reject)=>{
            this.core.onmessage = e=>{
                this.core.onmessage = e=>this.onmessage(e.data);
                resolve();
            };
            this.core.postMessage({
                command: "Init",
                wasm   : Bundle.get("core.wasm").data.buffer
            });
        });

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

        // Debugging windows
        this.debuggers = [
            new Debugger(this, 0),
            new Debugger(this, 1)
        ];

    }

    // Initialize environment settings
    initEnv() {

        // 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);
    }

    // Initialize main menu bar
    initMenus() {

        // 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());

        // Debug menu
        menu = this.mainMenu.newMenu({ text: "{menu.debug._}" });
        item = menu.newMenuItem({ text: "{memory._}" });
        item.addClickListener(
            ()=>this.debuggers[0].memory.setVisible(true, true));
        item = menu.newMenuItem({ text: "{cpu._}" });
        item.addClickListener(
            ()=>this.debuggers[0].cpu.setVisible(true, true));

        // 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"));
    }


    ///////////////////////////// Message Methods /////////////////////////////

    // Message received
    onmessage(msg) {
        if ("dbgwnd" in msg) {
            this.debuggers[msg.sim].message(msg);
            return;
        }
        switch (msg.command) {
            case "SetROM": this.setROM(msg); break;
        }
    }

    // ROM buffer has been configured
    setROM(msg) {
        let dbg = this.debuggers[msg.sim];
        dbg.refresh();
    }



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

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

    // Specify a ROM file
    async selectROM(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 = await file.arrayBuffer(); }
        catch {
            alert(this.gui.translate("{app.readFileError}"));
            return;
        }

        // Send the ROM to the WebAssembly core module
        this.core.postMessage({
            command: "SetROM",
            reset  : true,
            rom    : file,
            sim    : 0
        }, file);
    }

    // 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);
    }

};