import removeMd from 'remove-markdown'

export function rand(length) {
    let result = '';
    const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    const charactersLength = characters.length;
    let counter = 0;
    while (counter < length) {
        result += characters.charAt(Math.floor(Math.random() * charactersLength));
        counter += 1;
    }
    return result;
}

export function animateText (ev, interval = 50) {
    if (!ev.target.getAttribute('data-text')) {
        ev.target.setAttribute('data-text', ev.target.innerHTML)
    }
    if (ev.target.getAttribute('data-animate') === "1") {
        return;
    }
    ev.target.setAttribute('data-animate', "1")
    const orig = removeMd(ev.target.getAttribute('data-text')).replace('&amp;', '&')
    const steps = orig.length

    const genRand = (pos = 0, len = null) => orig.substring(pos, len).split(' ').map(x => rand(x.length)).join(' ')
    const random = genRand(0, orig.length)

    ev.target.innerHTML = random

    for (let i = 0; i <= steps; i++) {
        setTimeout(() => {
            ev.target.innerHTML = orig.substring(0, i) + genRand(i, orig.length)
            //console.log(ev.target.innerHTML)

            if (i === steps) {
                ev.target.setAttribute('data-animate', "0")
            }
        }, interval * i)
    }
}

export async function handleAnchorClick (event) {
    event.preventDefault()
    const link = event.currentTarget
    const anchorId = new URL(link.href).hash.replace('#', '')
    const anchor = document.getElementById(anchorId || 'intro')
    return window.scrollTo({
        top: anchor.offsetTop,
        behavior: 'smooth'
    })
}