export default  {

    innerWidth(el) {
        if (el) {
            let width = el.offsetWidth;
            let style = getComputedStyle(el);

            width += parseFloat(style.paddingLeft) + parseFloat(style.paddingRight);
            return width;
        }
        return 0;
    },

    width(el) {
        if (el) {
            let width = el.offsetWidth;
            let style = getComputedStyle(el);

            width -= parseFloat(style.paddingLeft) + parseFloat(style.paddingRight);
            return width;
        }
        return 0;
    },

    getWindowScrollTop() {
        let doc = document.documentElement;
        return (window.pageYOffset || doc.scrollTop) - (doc.clientTop || 0);
    },

    getWindowScrollLeft() {
        let doc = document.documentElement;
        return (window.pageXOffset || doc.scrollLeft) - (doc.clientLeft || 0);
    },

    getOuterWidth(el, margin) {
        if (el) {
            let width = el.offsetWidth;

            if (margin) {
                let style = getComputedStyle(el);
                width += parseFloat(style.marginLeft) + parseFloat(style.marginRight);
            }

            return width;
        }
        return 0;
    },

    getOuterHeight(el, margin) {
        if (el) {
            let height = el.offsetHeight;

            if (margin) {
                let style = getComputedStyle(el);
                height += parseFloat(style.marginTop) + parseFloat(style.marginBottom);
            }

            return height;
        }
        return 0;
    },

    getClientHeight(el, margin) {
        if (el) {
            let height = el.clientHeight;

            if (margin) {
                let style = getComputedStyle(el);
                height += parseFloat(style.marginTop) + parseFloat(style.marginBottom);
            }

            return height;
        }
        return 0;
    },

    getViewport() {
        let win = window,
            d = document,
            e = d.documentElement,
            g = d.getElementsByTagName('body')[0],
            w = win.innerWidth || e.clientWidth || g.clientWidth,
            h = win.innerHeight || e.clientHeight || g.clientHeight;

        return { width: w, height: h };
    },

    getOffset(el) {
        if (el) {
            let rect = el.getBoundingClientRect();

            return {
                top: rect.top + (window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0),
                left: rect.left + (window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft || 0),
            };
        }

        return {
            top: 'auto',
            left: 'auto'
        };
    },

    index(element) {
        if (element) {
            let children = element.parentNode.childNodes;
            let num = 0;
            for (let i = 0; i < children.length; i++) {
                if (children[i] === element) return num;
                if (children[i].nodeType === 1) num++;
            }
        }
        return -1;
    },

    addMultipleClasses(element, className) {
        if (element && className) {
            if (element.classList) {
                let styles = className.split(' ');
                for (let i = 0; i < styles.length; i++) {
                    element.classList.add(styles[i]);
                }

            }
            else {
                let styles = className.split(' ');
                for (let i = 0; i < styles.length; i++) {
                    element.className += ' ' + styles[i];
                }
            }
        }
    },

    addClass(element, className) {
        if (element && className) {
            if (element.classList)
                element.classList.add(className);
            else
                element.className += ' ' + className;
        }
    },

    removeClass(element, className) {
        if (element && className) {
            if (element.classList)
                element.classList.remove(className);
            else
                element.className = element.className.replace(new RegExp('(^|\\b)' + className.split(' ').join('|') + '(\\b|$)', 'gi'), ' ');
        }
    },

    hasClass(element, className) {
        if (element) {
            if (element.classList)
                return element.classList.contains(className);
            else
                return new RegExp('(^| )' + className + '( |$)', 'gi').test(element.className);
        }

        return false;
    },

    find(element, selector) {
        return element ? element.querySelectorAll(selector) : [];
    },

    findSingle(element, selector) {
        if (element) {
            return element.querySelector(selector);
        }
        return null;
    },

    getHeight(el) {
        if (el) {
            let height = el.offsetHeight;
            let style = getComputedStyle(el);

            height -= parseFloat(style.paddingTop) + parseFloat(style.paddingBottom) + parseFloat(style.borderTopWidth) + parseFloat(style.borderBottomWidth);

            return height;
        }
        return 0;
    },

    getWidth(el) {
        if (el) {
            let width = el.offsetWidth;
            let style = getComputedStyle(el);

            width -= parseFloat(style.paddingLeft) + parseFloat(style.paddingRight) + parseFloat(style.borderLeftWidth) + parseFloat(style.borderRightWidth);

            return width;
        }
        return 0;
    },

    absolutePosition(element, target) {
        if (element) {
            let elementDimensions = element.offsetParent ? { width: element.offsetWidth, height: element.offsetHeight } : this.getHiddenElementDimensions(element)
            let elementOuterHeight = elementDimensions.height;
            let elementOuterWidth = elementDimensions.width;
            let targetOuterHeight = target.offsetHeight;
            let targetOuterWidth = target.offsetWidth;
            let targetOffset = target.getBoundingClientRect();
            let windowScrollTop = this.getWindowScrollTop();
            let windowScrollLeft = this.getWindowScrollLeft();
            let viewport = this.getViewport();
            let top, left;

            if (targetOffset.top + targetOuterHeight + elementOuterHeight > viewport.height) {
                top = targetOffset.top + windowScrollTop - elementOuterHeight;
                element.style.transformOrigin = 'bottom';

                if (top < 0) {
                    top = windowScrollTop;
                }
            }
            else {
                top = targetOuterHeight + targetOffset.top + windowScrollTop;
                element.style.transformOrigin = 'top';
            }

            if (targetOffset.left + elementOuterWidth > viewport.width)
                left = Math.max(0, targetOffset.left + windowScrollLeft + targetOuterWidth - elementOuterWidth);
            else
                left = targetOffset.left + windowScrollLeft;

            element.style.top = top + 'px';
            element.style.left = left + 'px';
        }
    },

    relativePosition(element, target) {
        if (element) {
            let elementDimensions = element.offsetParent ? { width: element.offsetWidth, height: element.offsetHeight } : this.getHiddenElementDimensions(element);
            const targetHeight = target.offsetHeight;
            const targetOffset = target.getBoundingClientRect();
            const viewport = this.getViewport();
            let top, left;

            if ((targetOffset.top + targetHeight + elementDimensions.height) > viewport.height) {
                top = -1 * (elementDimensions.height);
                element.style.transformOrigin = 'bottom';
                if (targetOffset.top + top < 0) {
                    top = -1 * targetOffset.top;
                }
            }
            else {
                top = targetHeight;
                element.style.transformOrigin = 'top';
            }

            if (elementDimensions.width > viewport.width) {
                // element wider then viewport and cannot fit on screen (align at left side of viewport)
                left = targetOffset.left * -1;
            }
            else if ((targetOffset.left + elementDimensions.width) > viewport.width) {
                // element wider then viewport but can be fit on screen (align at right side of viewport)
                left = (targetOffset.left + elementDimensions.width - viewport.width) * -1;
            }
            else {
                // element fits on screen (align with target)
                left = 0;
            }

            element.style.top = top + 'px';
            element.style.left = left + 'px';
        }
    },

    getParents(element, parents = []) {
        return element['parentNode'] === null ? parents : this.getParents(element.parentNode, parents.concat([element.parentNode]));
    },

    getScrollableParents(element) {
        let scrollableParents = [];

        if (element) {
            let parents = this.getParents(element);
            const overflowRegex = /(auto|scroll)/;
            const overflowCheck = (node) => {
                let styleDeclaration = window['getComputedStyle'](node, null);
                return overflowRegex.test(styleDeclaration.getPropertyValue('overflow')) || overflowRegex.test(styleDeclaration.getPropertyValue('overflowX')) || overflowRegex.test(styleDeclaration.getPropertyValue('overflowY'));
            };

            for (let parent of parents) {
                let scrollSelectors = parent.nodeType === 1 && parent.dataset['scrollselectors'];
                if (scrollSelectors) {
                    let selectors = scrollSelectors.split(',');
                    for (let selector of selectors) {
                        let el = this.findSingle(parent, selector);
                        if (el && overflowCheck(el)) {
                            scrollableParents.push(el);
                        }
                    }
                }

                if (parent.nodeType !== 9 && overflowCheck(parent)) {
                    scrollableParents.push(parent);
                }
            }
        }

        return scrollableParents;
    },

    getHiddenElementOuterHeight(element) {
        if (element) {
            element.style.visibility = 'hidden';
            element.style.display = 'block';
            let elementHeight = element.offsetHeight;
            element.style.display = 'none';
            element.style.visibility = 'visible';

            return elementHeight;
        }
        return 0;
    },

    getHiddenElementOuterWidth(element) {
        if (element) {
            element.style.visibility = 'hidden';
            element.style.display = 'block';
            let elementWidth = element.offsetWidth;
            element.style.display = 'none';
            element.style.visibility = 'visible';

            return elementWidth;
        }
        return 0;
    },

    getHiddenElementDimensions(element) {
        if (element) {
            let dimensions = {};
            element.style.visibility = 'hidden';
            element.style.display = 'block';
            dimensions.width = element.offsetWidth;
            dimensions.height = element.offsetHeight;
            element.style.display = 'none';
            element.style.visibility = 'visible';

            return dimensions;
        }
        return 0;
    },

    fadeIn(element, duration) {
        if (element) {
            element.style.opacity = 0;

            let last = +new Date();
            let opacity = 0;
            let tick = function () {
                opacity = +element.style.opacity + (new Date().getTime() - last) / duration;
                element.style.opacity = opacity;
                last = +new Date();

                if (+opacity < 1) {
                    (window.requestAnimationFrame && requestAnimationFrame(tick)) || setTimeout(tick, 16);
                }
            };

            tick();
        }
    },

    fadeOut(element, ms) {
        if (element) {
            let opacity = 1,
                interval = 50,
                duration = ms,
                gap = interval / duration;

            let fading = setInterval(() => {
                opacity -= gap;

                if (opacity <= 0) {
                    opacity = 0;
                    clearInterval(fading);
                }

                element.style.opacity = opacity;
            }, interval);
        }
    },

    getUserAgent() {
        return navigator.userAgent;
    },

    appendChild(element, target) {
        if (this.isElement(target))
            target.appendChild(element);
        else if (target.el && target.elElement)
            target.elElement.appendChild(element);
        else
            throw new Error('Cannot append ' + target + ' to ' + element);
    },

    scrollInView(container, item) {
        let borderTopValue = getComputedStyle(container).getPropertyValue('borderTopWidth');
        let borderTop = borderTopValue ? parseFloat(borderTopValue) : 0;
        let paddingTopValue = getComputedStyle(container).getPropertyValue('paddingTop');
        let paddingTop = paddingTopValue ? parseFloat(paddingTopValue) : 0;
        let containerRect = container.getBoundingClientRect();
        let itemRect = item.getBoundingClientRect();
        let offset = (itemRect.top + document.body.scrollTop) - (containerRect.top + document.body.scrollTop) - borderTop - paddingTop;
        let scroll = container.scrollTop;
        let elementHeight = container.clientHeight;
        let itemHeight = this.getOuterHeight(item);

        if (offset < 0) {
            container.scrollTop = scroll + offset;
        }
        else if ((offset + itemHeight) > elementHeight) {
            container.scrollTop = scroll + offset - elementHeight + itemHeight;
        }
    },

    clearSelection() {
        if (window.getSelection) {
            if (window.getSelection().empty) {
                window.getSelection().empty();
            } else if (window.getSelection().removeAllRanges && window.getSelection().rangeCount > 0 && window.getSelection().getRangeAt(0).getClientRects().length > 0) {
                window.getSelection().removeAllRanges();
            }
        }
        else if (document['selection'] && document['selection'].empty) {
            try {
                document['selection'].empty();
            } catch(error) {
                //ignore IE bug
            }
        }
    },

    calculateScrollbarWidth() {
        if (this.calculatedScrollbarWidth != null)
            return this.calculatedScrollbarWidth;

        let scrollDiv = document.createElement("div");
        scrollDiv.className = "p-scrollbar-measure";
        document.body.appendChild(scrollDiv);

        let scrollbarWidth = scrollDiv.offsetWidth - scrollDiv.clientWidth;
        document.body.removeChild(scrollDiv);

        this.calculatedScrollbarWidth = scrollbarWidth;

        return scrollbarWidth;
    },

    getBrowser() {
        if (!this.browser) {
            let matched = this.resolveUserAgent();
            this.browser = {};

            if (matched.browser) {
                this.browser[matched.browser] = true;
                this.browser['version'] = matched.version;
            }

            if (this.browser['chrome']) {
                this.browser['webkit'] = true;
            } else if (this.browser['webkit']) {
                this.browser['safari'] = true;
            }
        }

        return this.browser;
    },

    resolveUserAgent() {
        let ua = navigator.userAgent.toLowerCase();
        let match = /(chrome)[ ]([\w.]+)/.exec(ua) ||
            /(webkit)[ ]([\w.]+)/.exec(ua) ||
            /(opera)(?:.*version|)[ ]([\w.]+)/.exec(ua) ||
            /(msie) ([\w.]+)/.exec(ua) ||
            (ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec(ua)) ||
            [];

        return {
            browser: match[1] || "",
            version: match[2] || "0"
        };
    },

    isVisible(element) {
        return element && element.offsetParent != null;
    },

    invokeElementMethod(element, methodName, args) {
        (element)[methodName].apply(element, args);
    },

    isClient() {
        return !!(typeof window !== 'undefined' && window.document && window.document.createElement);
    },

    getFocusableElements(element, selector = '') {
        let focusableElements = this.find(element, `button:not([tabindex = "-1"]):not([disabled]):not([style*="display:none"]):not([hidden])${selector},
                [href][clientHeight][clientWidth]:not([tabindex = "-1"]):not([disabled]):not([style*="display:none"]):not([hidden])${selector},
                input:not([tabindex = "-1"]):not([disabled]):not([style*="display:none"]):not([hidden])${selector},
                select:not([tabindex = "-1"]):not([disabled]):not([style*="display:none"]):not([hidden])${selector},
                textarea:not([tabindex = "-1"]):not([disabled]):not([style*="display:none"]):not([hidden])${selector},
                [tabIndex]:not([tabIndex = "-1"]):not([disabled]):not([style*="display:none"]):not([hidden])${selector},
                [contenteditable]:not([tabIndex = "-1"]):not([disabled]):not([style*="display:none"]):not([hidden])${selector}`
        );

        let visibleFocusableElements = [];
        for (let focusableElement of focusableElements) {
            if (getComputedStyle(focusableElement).display != "none" && getComputedStyle(focusableElement).visibility != "hidden")
                visibleFocusableElements.push(focusableElement);
        }

        return visibleFocusableElements;
    },

    getFirstFocusableElement(element, selector) {
        const focusableElements = this.getFocusableElements(element, selector);
        return focusableElements.length > 0 ? focusableElements[0] : null;
    },

    isClickable(element) {
        const targetNode = element.nodeName;
        const parentNode = element.parentElement && element.parentElement.nodeName;

        return (targetNode == 'INPUT' || targetNode == 'BUTTON' || targetNode == 'A' ||
                parentNode == 'INPUT' || parentNode == 'BUTTON' || parentNode == 'A' ||
                this.hasClass(element, 'p-button') || this.hasClass(element.parentElement, 'p-button') ||
                this.hasClass(element.parentElement, 'p-checkbox') || this.hasClass(element.parentElement, 'p-radiobutton')
        );
    },

    applyStyle(element, style) {
        if (typeof style === 'string') {
            element.style.cssText = style;
        }
        else {
            for (let prop in style) {
                element.style[prop] = style[prop];
            }
        }
    },

    isIOS() {
        return /iPad|iPhone|iPod/.test(navigator.userAgent) && !window['MSStream'];
    },

    isAndroid() {
        return /(android)/i.test(navigator.userAgent);
    },

    isTouchDevice() {
        return (('ontouchstart' in window) || (navigator.maxTouchPoints > 0) || (navigator.msMaxTouchPoints > 0));
    },

    exportCSV(csv, filename) {
        let blob = new Blob([csv], {
            type: 'application/csv;charset=utf-8;'
        });

        if (window.navigator.msSaveOrOpenBlob) {
            navigator.msSaveOrOpenBlob(blob, filename + '.csv');
        }
        else {
            let link = document.createElement("a");
            if (link.download !== undefined) {
                link.setAttribute('href', URL.createObjectURL(blob));
                link.setAttribute('download', filename + '.csv');
                link.style.display = 'none';
                document.body.appendChild(link);
                link.click();
                document.body.removeChild(link);
            }
            else {
                csv = 'data:text/csv;charset=utf-8,' + csv;
                window.open(encodeURI(csv));
            }
        }
    }
}