import { getStartPositionInLine, setStartPositionInLine } from './position.js';
import { formatLine, load, save } from './md.js';

function ontextarea(e) {
    let ta = document.getElementById('ta');
    if (ta.style.display == 'none') {
        ta.style.display = 'inline';
    } else {
        ta.style.display = 'none';
    }
}

function onsave(e) {
    save(document.getElementById('ta'), document.getElementById('mdnotes'));
}

function onload(e) {
    load(document.getElementById('ta'), document.getElementById('mdnotes'));
}

function onedit(e) {
    let ret = getStartPositionInLine();
    let line = ret[0];
    let position = ret[1];

    if (line.innerText == '\n') {
        line.className = 'mdnotes_line';
        return;
    }

    let newline = formatLine(line.innerText);
    line.parentNode.replaceChild(newline, line);
    setStartPositionInLine(newline, position);
}

function onkeydown(e) {
    if (e.key != 'Tab') {
        return true;
    }

    e.preventDefault();
    let key = ' ';
    let ret = getStartPositionInLine();
    let line = ret[0];
    let position = ret[1];
    let txt = line.innerText;
    if (position == 0) {
        line.innerHTML = key + txt;    // 4 espaces =>  
    } else {
        line.innerHTML = txt.substring(0, position) + key + txt.substring(position, txt.length);
    }
    /*if (line.innerText.match(RegExp(emsp()))) {
        alert('emsp');
    }*/
    setStartPositionInLine(line, position + 1);
    onedit(e);
    return false;
}

function onkeyup(e) {
    if (e.key == 'Escape') {
        e.preventDefault();
        document.getElementById('mdnotes').blur();
        return false;
    }
}

function init() {
    let mdnotesdiv = document.getElementById('mdnotes');
    mdnotesdiv.addEventListener('input', onedit);
    mdnotesdiv.addEventListener('keyup', onkeyup);
    mdnotesdiv.addEventListener('keydown', onkeydown);
    let saveButton = document.getElementById('saveButton');
    saveButton.addEventListener('click', onsave);
    loadButton.addEventListener('click', onload);
    taButton.addEventListener('click', ontextarea);

    onload();
}

init();