/*Canopy - The next generation of stoner streaming software
Copyright (C) 2024-2026 Rainbownapkin and the TTN Community

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.*/

/**
 * Class to manage
 */
class themeManager{
    /**
     * Instantiates new Theme Manager 
     */
    constructor(){
        /**
         * Map of all available themes
         */
        this.themes = new Map([
            ["Movie Night", "/css/theme/movie-night.css"],
            ["The Network (Classic)", "/css/theme/the-network-classic.css"]
        ]);


        /**
         * Sets default theme for new users
         */
        this.defaultTheme = "The Network (Classic)";

        /**
         * Define property to hold theme link DOM node
         */
        this.themeLink = null;

        //Set theme from preference
        this.setTheme(localStorage.getItem("theme"));
    }

    /**
     * Sets theme by name
     * @param {String} theme - name of theme to set, keep blank for default theme
     */
    setTheme(theme = localStorage.getItem("theme")){
        //If we didnt get a theme to set
        if(theme == null || theme == ""){
            //Use the first theme in the list
            theme = this.defaultTheme;
        }

        //If we have a link already setup
        if(this.themeLink != null){
            //Get Ridda it!
            this.themeLink.remove();
        }

        //Create new link element and use it to set themeLink
        this.themeLink = this.genThemeLink(theme);

        //If we got a bad link
        if(this.themeLink == null){
            //Reset the theme to the default theme
            this.setTheme(this.defaultTheme);
            //Do not pass go, do not collect $200
            return;
        }

        //Append themeLink to header
        document.querySelector('head').appendChild(this.themeLink);

        //Save theme choice to local storage
        localStorage.setItem("theme", theme);
    }

    genThemeLink(theme = localStorage.getItem("theme")){
        //Grab themePath by name
        let themePath = this.themes.get(theme)

        //If we got dookie-dick for a theme
        if(themePath == null || themePath == ""){
            //GIMME A THEME WITH NUTHIN'! NUTHIN'?!?! NUTHIN'!! https://i.ytimg.com/vi/CccHBlGrOu8/hqdefault.jpg
            return;
        }

        //Create new link element and use it to set themeLink
        const themeLink = document.createElement('link');

        //Set themeLink attributes
        themeLink.type = "text/css";
        themeLink.rel = "stylesheet";

        //Set theme href to theme location
        themeLink.href = themePath;

        return themeLink;
    }
}

ThemeManager = new themeManager();