const pretext = "root@baipyr.us:~# ";
let startPosition = 0;
let cursorPosition = 0;

document.addEventListener("keypress", e=>{
    if ((e.key == "Enter") || (e.code == "KeyV" && e.ctrlKey))
        return;
    let textbox = document.getElementById("input");
    const index = cursorPosition - startPosition;
    if (e.key == ' ' && (textbox.innerHTML[index-1] == ' ' || cursorPosition == startPosition))
        return;
    if (index <= textbox.innerHTML.length-1) {
        const text = textbox.innerHTML;
        const a = text.substring(0, index);
        const b = text.substring(index, text.length);
        textbox.innerHTML=a+e.key+b;
    } else
        textbox.innerHTML += e.key;
    cursorPosition++;
    updateCursor();
});

document.addEventListener("keydown", e=>{
    let textbox = document.getElementById("input");
    const index = cursorPosition - startPosition;
    const text = textbox.innerHTML;
    switch (e.key) {
        case "Backspace":
            // Ein Zeichen nach links löschen
            if (index == 0)
                return;
            if (index <= textbox.innerHTML.length-1) {
                const a = text.substring(0, index-1);
                const b = text.substring(index, text.length);
                textbox.innerHTML=a+b;
            } else
                textbox.innerHTML = text.substring(0,text.length-1);
            cursorPosition--;
            updateCursor();
            break;
        case "ArrowLeft":
            // Ein Zeichen nach links
            if (cursorPosition > startPosition) {
                cursorPosition--;
                updateCursor();
            }
            break;
        case "ArrowRight":
            // Ein Zeichen nach reckts
            if (index < textbox.innerHTML.length) {
                cursorPosition++;
                updateCursor();
            }
            break;
        case "Delete":
            // Ein Zeichen nach rechts löschen
            if (index == 0 || index >= textbox.innerHTML.length)
                return;
            const a = text.substring(0, index);
            const b = text.substring(index+1, text.length);
            textbox.innerHTML=a+b;
            break;
        case "Enter":
            // Befehl absenden / Zeilenumbruch
            const parent = document.getElementById("textbox");
            parent.removeChild(textbox);

            // Run command and return output???
            const commandOutput = "";
            
            parent.innerHTML += '<a style="color: white;">' + text + '</a><br>' + commandOutput + pretext;
            textbox.innerHTML = "";
            parent.appendChild(textbox);
            cursorPosition = startPosition;
            updateCursor();
            break;
        case "ArrowUp":
            // Einen Befehl zurück in der History
            break;
        case "ArrowDown":
            // Einen Befehl nach vorne in der History
            break;
        case "Tab":
            // Autocomplete
            break;
    }
});

function updateCursor() {
    let cursor = document.getElementById("cursor");
    const transform = `translate(${cursorPosition}ch)`;
    cursor.style.transform = transform;
}

function preload() {
    let cursor = document.getElementById("cursor");
    let textbox = document.getElementById("textbox");
    textbox.innerHTML = pretext+textbox.innerHTML;
    const length = textbox.innerText.length+1;
    const transform = `translate(${length}ch)`;
    cursor.style.transform = transform;
    startPosition = length;
    cursorPosition = length;
}

setInterval(()=>{
    let cursor = document.getElementById("cursor");
    cursor.style.opacity = (cursor.style.opacity=="1")?"0":"1";
},1000);