function getRequest (url) {
    return new Promise((resolve, reject) => {
        let xhttp = new XMLHttpRequest();
        xhttp.open('GET', url, true);
        xhttp.responseType = 'json';
        xhttp.onreadystatechange = () => {
            if (xhttp.readyState === 4 ) {
                if ( xhttp.status === 200) {
                    resolve(xhttp.response);
                } else if (xhttp.status === 403) {
                    reject('Wrong channel name or password');
                } else {
                    reject('request failed with status:' + xhttp.status);
                };
            }
        };
        xhttp.send();
    })
}

function postRequest (url, params) {
    return new Promise((resolve, reject) => {
        let xhttp = new XMLHttpRequest();
        xhttp.open('POST', url, true);
        xhttp.responseType = 'json';
        xhttp.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
        xhttp.onreadystatechange = () => {
            if (xhttp.readyState === 4 ) {
                if ( xhttp.status === 200) {
                    resolve(xhttp.response);
                } else if (xhttp.status === 401) {
                    reject( new AuthenticationError('Wrong channel name or password'));
                } else {
                    reject('request failed with status:' + xhttp.status);
                };
            }
        };
        xhttp.send(params);
    })
}

function toggleSection(event){
    event.preventDefault();
    var dataSet = event.target.dataset;
    var status = dataSet.open;
    var masterElement = document.getElementById(event.target.id||event.srcElement.id);
    var slaveElement = document.getElementById(dataSet.slaveelementid);
    var closedLabel = dataSet.closedlabel;
    var openLabel = dataSet.openlabel;
    if (status === "false") {
        slaveElement.hidden = false;
        masterElement.innerText = openLabel;
    masterElement.dataset.open = "true";
    } else {
        slaveElement.hidden = true;
        masterElement.innerText = closedLabel;
        masterElement.dataset.open = "false";
    }
  }

function createProgressBar(element, size){
	var x = 0;
	var adder = 1;
	// create the bar holder & place it
    var barHolder = document.createElement('p');
	for (var i = 0; i < size; i++) {
        const bar = document.createElement('span');
        bar.innerText = '| ';
        bar.setAttribute('class', 'progress-bar progress-bar--inactive');
        barHolder.appendChild(bar);
    }
    element.appendChild(barHolder);
	// get the bars
    const bars = document.getElementsByClassName('progress-bar');
    // function to update the bars' classes
	function updateOneBar(){
        // update the appropriate bar
        if (x > -1 && x < size){
            if (adder === 1){
                bars[x].setAttribute('class', 'progress-bar progress-bar--active');
            } else {
                bars[x].setAttribute('class', 'progress-bar progress-bar--inactive');
            }
        }
        // set x
        if (x === size){
            adder = -1;
        } else if ( x === -1){
            adder = 1;
        }
        // update the adder
        x += adder;

	};
	// start updater
	setInterval(updateOneBar, 300);
}

function copyToClipboard(event){
    var elementToCopy = event.target.dataset.elementtocopy;
    var element = document.getElementById(elementToCopy);
    var errorElement = 'input-error-copy-text' + elementToCopy;
    element.select();
    try {
        document.execCommand('copy');
    } catch (err) {
        validationFunctions.showError(errorElement, 'Oops, unable to copy');
    }
}

// Create new error objects, that prototypically inherit from the Error constructor
function FileError(message) {
  this.name = 'FileError';
  this.message = message || 'Default Message';
  this.stack = (new Error()).stack;
}
FileError.prototype = Object.create(Error.prototype);
FileError.prototype.constructor = FileError;

function NameError(message) {
  this.name = 'NameError';
  this.message = message || 'Default Message';
  this.stack = (new Error()).stack;
}
NameError.prototype = Object.create(Error.prototype);
NameError.prototype.constructor = NameError;

function ChannelNameError(message) {
    this.name = 'ChannelNameError';
    this.message = message || 'Default Message';
    this.stack = (new Error()).stack;
}
ChannelNameError.prototype = Object.create(Error.prototype);
ChannelNameError.prototype.constructor = ChannelNameError;

function ChannelPasswordError(message) {
    this.name = 'ChannelPasswordError';
    this.message = message || 'Default Message';
    this.stack = (new Error()).stack;
}
ChannelPasswordError.prototype = Object.create(Error.prototype);
ChannelPasswordError.prototype.constructor = ChannelPasswordError;

function AuthenticationError(message) {
    this.name = 'AuthenticationError';
    this.message = message || 'Default Message';
    this.stack = (new Error()).stack;
}
AuthenticationError.prototype = Object.create(Error.prototype);
AuthenticationError.prototype.constructor = AuthenticationError;

function showAssetDetails(event) {
    var thisAssetHolder = document.getElementById(event.target.id);
    var thisAssetImage = thisAssetHolder.firstElementChild;
    var thisAssetDetails = thisAssetHolder.lastElementChild;
    thisAssetImage.style.opacity = 0.2;
    thisAssetDetails.setAttribute('class', 'grid-item-details flex-container--column flex-container--center-center');
}

function hideAssetDetails(event) {
    var thisAssetHolder = document.getElementById(event.target.id);
    var thisAssetImage = thisAssetHolder.firstElementChild;
    var thisAssetDetails = thisAssetHolder.lastElementChild;
    thisAssetImage.style.opacity = 1;
    thisAssetDetails.setAttribute('class', 'hidden');
}