// from https://www.codemzy.com/blog/sticky-fixed-header-ios-keyboard-fix
// replaced lodash debounce w/ vanilla js debounce

let fixPosition = 0; // the fix
let lastScrollY = window.pageYOffset; // the last scroll position
let toolbarWrap = document.getElementById('toolbar-wrap'); // the toolbar wrap
let toolbar = document.getElementById('toolbar'); // the toolbar
// let editor = document.getElementById('main'); // the editor



// from: https://www.joshwcomeau.com/snippets/javascript/debounce/
const debounce = (callback, wait) => {
    let timeoutId = null;
    return (...args) => {
        window.clearTimeout(timeoutId);
        timeoutId = window.setTimeout(() => {
            callback.apply(null, args);
        }, wait);
    };
}

// function to set the margin to show the toolbar if hidden
const setMargin = function () {
    // if toolbar wrap is hidden
    const newPosition = toolbarWrap.getBoundingClientRect().top;
    if (newPosition < -1) {
        // add a margin to show the toolbar
        toolbar.classList.add("down"); // add class so toolbar can be animated
        fixPosition = Math.abs(newPosition); // this is new position we need to fix the toolbar in the display
        // if at the bottom of the page take a couple of pixels off due to gap
        if ((window.innerHeight + window.pageYOffset) >= document.body.offsetHeight) {
            fixPosition -= 2;
        }
        // set the margin to the new fixed position
        toolbar.style["margin-top"] = fixPosition + "px";
    }
}



// use debounce to stop flicker
const debounceMargin = debounce(setMargin, 150);

// function to run on scroll and blur
export const showToolbar = () => {
    // remove animation and put toolbar back in default position
    if (fixPosition > 0) {
        toolbar.classList.remove("down");
        fixPosition = 0;
        toolbar.style["margin-top"] = 0 + "px";
    }
    // will check if toolbar needs to be fixed
    debounceMargin();
}