function galleryFilter(showValue) {
    const elems = document.getElementsByClassName("gallery-item");
    const dElems = document.getElementsByClassName("gallery-description");
    const showElems = document.getElementsByClassName(showValue);

    for(let i = 0; i < dElems.length; i++){
        const dElem = dElems[i];
        dElem.style.display='none';
    }

    for(let i = 0; i < elems.length; i++){
        const elem = elems[i];
        elem.style.display='none';
    }

    for(let i = 0; i < showElems.length; i++){
        const sElem = showElems[i];
        sElem.style.display='initial';
    }
}

let currImgArr = [];

let currImgInd = 0;

let currImg = 'img/portfolio-01.jpg';

function openModalAll(className, imgArr) {
    const elems = document.getElementsByClassName(className);

    elems[0].style.display = imgArr ? 'flex' : 'none';

    currImgArr = imgArr;
}

function zoomModal(initIndex) {
    const elems = document.getElementsByClassName("modal-gallery");

    elems[0].style.display = initIndex === false ? 'none' : 'flex';

    currImgInd = initIndex;

    currImg = 'img/' + currImgArr[currImgInd];

    const imgElems = document.getElementsByClassName("modal-gallery-image");

    imgElems[0].src = currImg;

    const nextElems = document.getElementsByClassName("modal-gallery-button-next");
    if(currImgInd === (currImgArr.length - 1)){
        nextElems[0].style.visibility = 'hidden';
        nextElems[0].style.pointerEvents = 'none';
    } else {
        nextElems[0].style.visibility = 'visible';
        nextElems[0].style.pointerEvents = 'initial';
    }

    const prevElems = document.getElementsByClassName("modal-gallery-button-prev");
    if(currImgInd === 0){
        prevElems[0].style.visibility = 'hidden';
        prevElems[0].style.pointerEvents = 'none';
    } else {
        prevElems[0].style.visibility = 'visible';
        prevElems[0].style.pointerEvents = 'initial';
    }

    if(imgArr.length === 1){
        nextElems[0].style.visibility = 'hidden';
        nextElems[0].style.pointerEvents = 'none';
    } else {
        nextElems[0].style.visibility = 'visible';
        nextElems[0].style.pointerEvents = 'initial';
    }
}

function nextImg() {
    currImgInd += 1;

    currImg = 'img/' + currImgArr[currImgInd];

    const imgElems = document.getElementsByClassName("modal-gallery-image");

    imgElems[0].src = currImg;

    const nextElems = document.getElementsByClassName("modal-gallery-button-next");
    if(currImgInd === (currImgArr.length - 1)){
        nextElems[0].style.visibility = 'hidden';
        nextElems[0].style.pointerEvents = 'none';
    } else {
        nextElems[0].style.visibility = 'visible';
        nextElems[0].style.pointerEvents = 'initial';
    }

    const prevElems = document.getElementsByClassName("modal-gallery-button-prev");
    if(currImgInd === 0){
        prevElems[0].style.visibility = 'hidden';
        prevElems[0].style.pointerEvents = 'none';
    } else {
        prevElems[0].style.visibility = 'visible';
        prevElems[0].style.pointerEvents = 'initial';
    }
}

function prevImg() {
    currImgInd -= 1;

    currImg = 'img/' + currImgArr[currImgInd];

    const imgElems = document.getElementsByClassName("modal-gallery-image");

    imgElems[0].src = currImg;

    const nextElems = document.getElementsByClassName("modal-gallery-button-next");
    if(currImgInd === (currImgArr.length - 1)){
        nextElems[0].style.visibility = 'hidden';
        nextElems[0].style.pointerEvents = 'none';
    } else {
        nextElems[0].style.visibility = 'visible';
        nextElems[0].style.pointerEvents = 'initial';
    }

    const prevElems = document.getElementsByClassName("modal-gallery-button-prev");
    if(currImgInd === 0){
        prevElems[0].style.visibility = 'hidden';
        prevElems[0].style.pointerEvents = 'none';
    } else {
        prevElems[0].style.visibility = 'visible';
        prevElems[0].style.pointerEvents = 'initial';
    }
}