script.js

const imageContainer = document.getElementById('image-container');
const loader = document.getElementById('loader');

let ready = false;
let imagesLoaded = 0;
let totalImages = 0;
let photosArray = [];

// Unsplash API
let count = 5;
const apiKey = 'J9rs2HZMPm9f-iwc4NRmCK1XtF0PW3r1FGFysjX3xi4';
let apiUrl = `https://api.unsplash.com/photos/random/?client_id=${apiKey}&count=${count}`;

// helper function to set attributes and DOM elelemnts
function setAttributes(element, attributes) {
    for (const key in attributes) {
        element.setAttribute(key, attributes[key]);
    }
}

// check if all images were loaded
function imageLoaded() {
    imagesLoaded++;
    console.log(imagesLoaded);
    if(imagesLoaded === totalImages) {
        ready = true;
        loader.hidden = true;
        // console.log('ready =', ready);
    }
}

// create elelemtns for links, photos & add to DOM
function displayPhotos() {
    imagesLoaded = 0;
    totalImages = photosArray.length;
    // console.log('total images', totalImages);

    photosArray.forEach((photo) => {
        // create anchor element to link to unsplash
        const item = document.createElement('a');
        setAttributes(item,{
            href: photo.links.html,
            target: '_blank',
        });
        // create image element for photo
        const img = document.createElement('img');
        setAttributes(img, {
            src: photo.urls.regular,
            alt: photo.alt_description,
            title: photo.alt_description,
        });     
        // event listener, check when each is finished loading
        img.addEventListener('load', imageLoaded);
        // add image to anchor & anchor to image container
        item.appendChild(img);
        imageContainer.appendChild(item);
    });
}


// get photos from api
async function getPhotos(){
    try {
        const response = await fetch(apiUrl);
        photosArray = await response.json();
        displayPhotos();
        // if(initialCount === true){
        //     initialCount*= 30;
        // }
    } catch (error) {
        // error catcher
    }
}

// Check if scrolling near page end, Load more photos
window.addEventListener('scroll', ()=>{
    if (window.innerHeight + window.scrollY >= document.body.offsetHeight - 1000 && ready) {
        ready = false;
        getPhotos();
    }
});

// ON LOAD
getPhotos();