const randomColor = Math.floor(Math.random()*16777215).toString(16);
document.querySelector('#blog-title').firstElementChild.style.backgroundColor = '#' + randomColor;

let scrollHeight = Math.max(
    document.body.scrollHeight, document.documentElement.scrollHeight,
    document.body.offsetHeight, document.documentElement.offsetHeight,
    document.body.clientHeight, document.documentElement.clientHeight
);

let paras = document.getElementsByClassName("para");
for (let i = 0; i < paras.length; i++) {
    var imageSrc = paras[i].style.backgroundImage.replace(/url\((['"])?(.*?)\1\)/gi, '$2').split(',')[0];
    var image = new Image();
    image.src = imageSrc;
    if ( screen.width > screen.height ) {
        paras[i].setAttribute("offset", paras[i].getBoundingClientRect().bottom - image.height * 0.5);
    } else {
        paras[i].parentNode.insertBefore(image, paras[i].nextSibling);
        paras[i].style.display = 'none';
    }
}
window.addEventListener('scroll', () => {
    let { scrollY } = window;
    if ( screen.width > screen.height ) {
        for (let i = 0; i < paras.length; i++) {
            paras[i].style.backgroundPositionY = paras[i].getAttribute("offset") * 0.1 + -0.1 * scrollY + 'px';
        }
    }
});

//components
//console component
class Console{
    comps=[];
    input_received=false;
    blocking_interval=null;
    text_color="#bbb";
    constructor(root){
        this.elem=document.createElement("span");
        this.elem.className="console";
        root.appendChild(this.elem);
        this.resetTextColor();
    }
    appendComponent(comp){
        this.comps.push(comp);
        this.elem.appendChild(comp.elem);
    }
    writeLine(txt){
        let text=new Text(txt,this.text_color);
        this.appendComponent(text);
    }
    async readLine(txt){
        let text=new Text(txt,this.text_color);
        this.appendComponent(text);
        let input=new Input(this.text_color);
        this.appendComponent(input);
        input.elem.focus({ preventScroll: true});
        return new Promise(resolve=>{
            this.blocking_interval=setInterval(()=>{
                if(this.input_received){
                    this.input_received=false;
                    clearInterval(this.blocking_interval);
                    resolve(input.elem.innerText);
                }
            },500);
        })
    }
    setTextColor(color){
        this.text_color=color;
    }
    resetTextColor(){
        this.text_color="#bbb";
    }
    //helpers
    get lastComp(){return this.comps[this.comps.length-1]};
    }
    //text component
    class Text{
    constructor(txt,color){
        this.elem=document.createElement("span");
        this.elem.className="text";
        this.elem.style.color=color;
        this.elem.innerText=txt;
    }
    }
    //input component
    class Input{
    constructor(color){
        this.elem=document.createElement("span");
        this.elem.style.color=color;
        this.elem.contentEditable=true;
        this.elem.addEventListener('keydown',function(e){
            let key=e.key;
            if(key=="Enter"){
                e.preventDefault();
                cmd.input_received=true;
                cmd.lastComp.elem.contentEditable=false;
                cmd.lastComp.elem.style.borderWidth="0px";
            }
        });
    }
}

/************************************/
let root=document.getElementById("root");

let cmd=new Console(root);
let prompt = "C:\\>"
async function execute(){
    let command= await cmd.readLine(prompt);
    if ( command == "projects" ) window.location = "/current.html";
    else if ( command == "blog" ) window.location = "/blog";
    else if ( command == "archive" ) window.location = "/archive";
    else if ( command == "dir" ) window.location = "/archive";
    else if ( command == "home" ) window.location = "/";
    else if ( command == "connect" ) window.location = "/connect.html";
    else if ( command == "reboot" ) location.reload();
    else if ( command == "a:" ) { 
        prompt = "A:\\>";
        cmd.writeLine("\n");
        cmd=new Console(root);
        execute();
    }
    else if ( command == "b:" ) { 
        prompt = "B:\\>";
        cmd.writeLine("\n");
        cmd=new Console(root);
        execute();
    }
    else if ( command == "c:" ) { 
        prompt = "C:\\>";
        cmd.writeLine("\n");
        cmd=new Console(root);
        execute();
    }
    else {
        cmd.writeLine("\nSyntax error\n");
        cmd=new Console(root);
        execute();
    }
}
execute();