/*  Authors         :   Carlos C. Corrada-Bravo
                        David J. Ortiz-Rivera
                        José A. Quiñones-Flores

    Organization    :   Centro de Desarrollo y Consultoria Computacional
    Project         :   OPASO Material Registry   
    File            :   main.js
    Description     :   Compile mainly used functions */

/* current() - highlight current page in navbar */ 
function current(){
    var current = window.location.pathname;
    $(".link").each(function(){
        if($(this).attr("href") == current){
            $(this).addClass("current");
        }
    });
}
/* get_arg(arg: string) - fetches argument from url if set, else returns null */ 
function get_arg(arg){
    /* Get arg by id */ 
    var url = new URL(window.location.href);
    arg = url.searchParams.get(arg);
    return arg;
}
/* loading_screen(flag: bool) - hide/show loading screen */
function loading_screen(flag){
    if(flag){   /* show */
        $(".content").css("overflow","hidden");
        $(".loading-screen").show();
    }
    else{       /* hide */
        $(".loading-screen").hide();
        $(".content").css("overflow","auto");
    }
}
/* create_button(text: string,icon: object,cname: string,id: string,val: string) - generates button */ 
function create_button(text,icon,cname,id,val){
    var button = document.createElement("button");
    /* set attributes */ 
    button.setAttribute("class",cname);
    button.setAttribute("id",id);
    if(is_defined(val)){
        button.setAttribute("val",val);
    }
    /* set content */ 
    button.textContent = text;
    button.append(create_element("i",icon));
    return  button;
}
/* create_element(type: string,cname: string,content: string) - generates an html element */ 
function create_element(type,cname,content){
    var element = document.createElement(type);
    /* set class */ 
    element.setAttribute("class",cname);
    /* set content */
    if(is_defined(content)){
        element.textContent = content;
    }
    return element;
}
/* display_error(error: string) - display error to user */ 
function display_error(message){
    var error = create_element("div","error",message);
    $(".main").html(error);
}
/* is_defined(arg: any) - return true if an argument is defined */
function is_defined(arg){
    return typeof arg != undefined;
}