/*!medium-zoom 1.0.5 | MIT License | https://github.com/francoischalifour/medium-zoom*/
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined'
    ? (module.exports = factory())
    : typeof define === 'function' && define.amd
      ? define(factory)
      : ((global = global || self), (global.mediumZoom = factory()));
})(this, function () {
  'use strict';
  var _extends =
    Object.assign ||
    function (target) {
      for (var i = 1; i < arguments.length; i++) {
        var source = arguments[i];
        for (var key in source) {
          if (Object.prototype.hasOwnProperty.call(source, key)) {
            target[key] = source[key];
          }
        }
      }
      return target;
    };
  var isSupported = function isSupported(node) {
    return node.tagName === 'IMG';
  };
  var isNodeList = function isNodeList(selector) {
    return NodeList.prototype.isPrototypeOf(selector);
  };
  var isNode = function isNode(selector) {
    return selector && selector.nodeType === 1;
  };
  var isSvg = function isSvg(image) {
    var source = image.currentSrc || image.src;
    return source.substr(-4).toLowerCase() === '.svg';
  };
  var getImagesFromSelector = function getImagesFromSelector(selector) {
    try {
      if (Array.isArray(selector)) {
        return selector.filter(isSupported);
      }
      if (isNodeList(selector)) {
        return [].slice.call(selector).filter(isSupported);
      }
      if (isNode(selector)) {
        return [selector].filter(isSupported);
      }
      if (typeof selector === 'string') {
        return [].slice.call(document.querySelectorAll(selector)).filter(isSupported);
      }
      return [];
    } catch (err) {
      throw new TypeError(
        'The provided selector is invalid.\n' +
          'Expects a CSS selector, a Node element, a NodeList or an array.\n' +
          'See: https://github.com/francoischalifour/medium-zoom',
      );
    }
  };
  var createOverlay = function createOverlay() {
    var overlay = document.createElement('div');
    overlay.classList.add('medium-zoom-overlay');
    return overlay;
  };
  var cloneTarget = function cloneTarget(template) {
    var _template$getBounding = template.getBoundingClientRect(),
      top = _template$getBounding.top,
      left = _template$getBounding.left,
      width = _template$getBounding.width,
      height = _template$getBounding.height;
    var clone = template.cloneNode();
    var scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
    var scrollLeft = window.pageXOffset || document.documentElement.scrollLeft || document.body.scrollLeft || 0;
    clone.removeAttribute('id');
    clone.style.position = 'absolute';
    clone.style.top = top + scrollTop + 'px';
    clone.style.left = left + scrollLeft + 'px';
    clone.style.width = width + 'px';
    clone.style.height = height + 'px';
    clone.style.transform = '';
    return clone;
  };
  var createCustomEvent = function createCustomEvent(type, params) {
    var eventParams = _extends(
      {
        bubbles: false,
        cancelable: false,
        detail: undefined,
      },
      params,
    );
    if (typeof window.CustomEvent === 'function') {
      return new CustomEvent(type, eventParams);
    }
    var customEvent = document.createEvent('CustomEvent');
    customEvent.initCustomEvent(type, eventParams.bubbles, eventParams.cancelable, eventParams.detail);
    return customEvent;
  };
  var mediumZoom = function mediumZoom(selector) {
    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
    var Promise =
      window.Promise ||
      function Promise(fn) {
        function noop() {}

        fn(noop, noop);
      };
    var _handleClick = function _handleClick(event) {
      var target = event.target;
      if (target === overlay) {
        close();
        return;
      }
      if (images.indexOf(target) === -1) {
        return;
      }
      toggle({
        target: target,
      });
    };
    var _handleScroll = function _handleScroll() {
      if (isAnimating || !active.original) {
        return;
      }
      var currentScroll = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
      if (Math.abs(scrollTop - currentScroll) > zoomOptions.scrollOffset) {
        setTimeout(close, 150);
      }
    };
    var _handleKeyUp = function _handleKeyUp(event) {
      var key = event.key || event.keyCode;
      if (key === 'Escape' || key === 'Esc' || key === 27) {
        close();
      }
    };
    var update = function update() {
      var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
      var newOptions = options;
      if (options.container && options.container instanceof Object) {
        newOptions.container = _extends({}, zoomOptions.container, options.container);
      }
      if (options.template) {
        var template = isNode(options.template) ? options.template : document.querySelector(options.template);
        newOptions.template = template;
      }
      zoomOptions = _extends({}, zoomOptions, newOptions);
      images.forEach(function (image) {
        image.dispatchEvent(
          createCustomEvent('medium-zoom:update', {
            detail: {
              zoom: zoom,
            },
          }),
        );
      });
      return zoom;
    };
    var clone = function clone() {
      var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
      return mediumZoom(_extends({}, zoomOptions, options));
    };
    var attach = function attach() {
      for (var _len = arguments.length, selectors = Array(_len), _key = 0; _key < _len; _key++) {
        selectors[_key] = arguments[_key];
      }
      var newImages = selectors.reduce(function (imagesAccumulator, currentSelector) {
        return [].concat(imagesAccumulator, getImagesFromSelector(currentSelector));
      }, []);
      newImages
        .filter(function (newImage) {
          return images.indexOf(newImage) === -1;
        })
        .forEach(function (newImage) {
          images.push(newImage);
          newImage.classList.add('medium-zoom-image');
        });
      eventListeners.forEach(function (_ref) {
        var type = _ref.type,
          listener = _ref.listener,
          options = _ref.options;
        newImages.forEach(function (image) {
          image.addEventListener(type, listener, options);
        });
      });
      return zoom;
    };
    var detach = function detach() {
      for (var _len2 = arguments.length, selectors = Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
        selectors[_key2] = arguments[_key2];
      }
      if (active.zoomed) {
        close();
      }
      var imagesToDetach =
        selectors.length > 0
          ? selectors.reduce(function (imagesAccumulator, currentSelector) {
              return [].concat(imagesAccumulator, getImagesFromSelector(currentSelector));
            }, [])
          : images;
      imagesToDetach.forEach(function (image) {
        image.classList.remove('medium-zoom-image');
        image.dispatchEvent(
          createCustomEvent('medium-zoom:detach', {
            detail: {
              zoom: zoom,
            },
          }),
        );
      });
      images = images.filter(function (image) {
        return imagesToDetach.indexOf(image) === -1;
      });
      return zoom;
    };
    var on = function on(type, listener) {
      var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
      images.forEach(function (image) {
        image.addEventListener('medium-zoom:' + type, listener, options);
      });
      eventListeners.push({
        type: 'medium-zoom:' + type,
        listener: listener,
        options: options,
      });
      return zoom;
    };
    var off = function off(type, listener) {
      var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
      images.forEach(function (image) {
        image.removeEventListener('medium-zoom:' + type, listener, options);
      });
      eventListeners = eventListeners.filter(function (eventListener) {
        return !(
          eventListener.type === 'medium-zoom:' + type && eventListener.listener.toString() === listener.toString()
        );
      });
      return zoom;
    };
    var open = function open() {
      var _ref2 = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
        target = _ref2.target;
      var _animate = function _animate() {
        var container = {
          width: document.documentElement.clientWidth,
          height: document.documentElement.clientHeight,
          left: 0,
          top: 0,
          right: 0,
          bottom: 0,
        };
        var viewportWidth = void 0;
        var viewportHeight = void 0;
        if (zoomOptions.container) {
          if (zoomOptions.container instanceof Object) {
            container = _extends({}, container, zoomOptions.container);
            viewportWidth = container.width - container.left - container.right - zoomOptions.margin * 2;
            viewportHeight = container.height - container.top - container.bottom - zoomOptions.margin * 2;
          } else {
            var zoomContainer = isNode(zoomOptions.container)
              ? zoomOptions.container
              : document.querySelector(zoomOptions.container);
            var _zoomContainer$getBou = zoomContainer.getBoundingClientRect(),
              _width = _zoomContainer$getBou.width,
              _height = _zoomContainer$getBou.height,
              _left = _zoomContainer$getBou.left,
              _top = _zoomContainer$getBou.top;
            container = _extends({}, container, {
              width: _width,
              height: _height,
              left: _left,
              top: _top,
            });
          }
        }
        viewportWidth = viewportWidth || container.width - zoomOptions.margin * 2;
        viewportHeight = viewportHeight || container.height - zoomOptions.margin * 2;
        var zoomTarget = active.zoomedHd || active.original;
        var naturalWidth = isSvg(zoomTarget) ? viewportWidth : zoomTarget.naturalWidth || viewportWidth;
        var naturalHeight = isSvg(zoomTarget) ? viewportHeight : zoomTarget.naturalHeight || viewportHeight;
        var _zoomTarget$getBoundi = zoomTarget.getBoundingClientRect(),
          top = _zoomTarget$getBoundi.top,
          left = _zoomTarget$getBoundi.left,
          width = _zoomTarget$getBoundi.width,
          height = _zoomTarget$getBoundi.height;
        var scaleX = Math.min(naturalWidth, viewportWidth) / width;
        var scaleY = Math.min(naturalHeight, viewportHeight) / height;
        var scale = Math.min(scaleX, scaleY);
        var translateX = (-left + (viewportWidth - width) / 2 + zoomOptions.margin + container.left) / scale;
        var translateY = (-top + (viewportHeight - height) / 2 + zoomOptions.margin + container.top) / scale;
        var transform = 'scale(' + scale + ') translate3d(' + translateX + 'px, ' + translateY + 'px, 0)';
        active.zoomed.style.transform = transform;
        if (active.zoomedHd) {
          active.zoomedHd.style.transform = transform;
        }
      };
      return new Promise(function (resolve) {
        if (target && images.indexOf(target) === -1) {
          resolve(zoom);
          return;
        }
        var _handleOpenEnd = function _handleOpenEnd() {
          isAnimating = false;
          active.zoomed.removeEventListener('transitionend', _handleOpenEnd);
          active.original.dispatchEvent(
            createCustomEvent('medium-zoom:opened', {
              detail: {
                zoom: zoom,
              },
            }),
          );
          resolve(zoom);
        };
        if (active.zoomed) {
          resolve(zoom);
          return;
        }
        if (target) {
          active.original = target;
        } else if (images.length > 0) {
          var _images = images;
          active.original = _images[0];
        } else {
          resolve(zoom);
          return;
        }
        active.original.dispatchEvent(
          createCustomEvent('medium-zoom:open', {
            detail: {
              zoom: zoom,
            },
          }),
        );
        scrollTop = window.pageYOffset || document.documentElement.scrollTop || document.body.scrollTop || 0;
        isAnimating = true;
        active.zoomed = cloneTarget(active.original);
        document.body.appendChild(overlay);
        if (zoomOptions.template) {
          var template = isNode(zoomOptions.template)
            ? zoomOptions.template
            : document.querySelector(zoomOptions.template);
          active.template = document.createElement('div');
          active.template.appendChild(template.content.cloneNode(true));
          document.body.appendChild(active.template);
        }
        document.body.appendChild(active.zoomed);
        window.requestAnimationFrame(function () {
          document.body.classList.add('medium-zoom--opened');
        });
        active.original.classList.add('medium-zoom-image--hidden');
        active.zoomed.classList.add('medium-zoom-image--opened');
        active.zoomed.addEventListener('click', close);
        active.zoomed.addEventListener('transitionend', _handleOpenEnd);
        if (active.original.getAttribute('data-zoom-src')) {
          active.zoomedHd = active.zoomed.cloneNode();
          active.zoomedHd.removeAttribute('srcset');
          active.zoomedHd.removeAttribute('sizes');
          active.zoomedHd.src = active.zoomed.getAttribute('data-zoom-src');
          active.zoomedHd.onerror = function () {
            clearInterval(getZoomTargetSize);
            console.warn('Unable to reach the zoom image target ' + active.zoomedHd.src);
            active.zoomedHd = null;
            _animate();
          };
          var getZoomTargetSize = setInterval(function () {
            if (active.zoomedHd.complete) {
              clearInterval(getZoomTargetSize);
              active.zoomedHd.classList.add('medium-zoom-image--opened');
              active.zoomedHd.addEventListener('click', close);
              document.body.appendChild(active.zoomedHd);
              _animate();
            }
          }, 10);
        } else if (active.original.hasAttribute('srcset')) {
          active.zoomedHd = active.zoomed.cloneNode();
          active.zoomedHd.removeAttribute('sizes');
          var loadEventListener = active.zoomedHd.addEventListener('load', function () {
            active.zoomedHd.removeEventListener('load', loadEventListener);
            active.zoomedHd.classList.add('medium-zoom-image--opened');
            active.zoomedHd.addEventListener('click', close);
            document.body.appendChild(active.zoomedHd);
            _animate();
          });
        } else {
          _animate();
        }
      });
    };
    var close = function close() {
      return new Promise(function (resolve) {
        if (isAnimating || !active.original) {
          resolve(zoom);
          return;
        }
        var _handleCloseEnd = function _handleCloseEnd() {
          active.original.classList.remove('medium-zoom-image--hidden');
          document.body.removeChild(active.zoomed);
          if (active.zoomedHd) {
            document.body.removeChild(active.zoomedHd);
          }
          document.body.removeChild(overlay);
          active.zoomed.classList.remove('medium-zoom-image--opened');
          if (active.template) {
            document.body.removeChild(active.template);
          }
          isAnimating = false;
          active.zoomed.removeEventListener('transitionend', _handleCloseEnd);
          active.original.dispatchEvent(
            createCustomEvent('medium-zoom:closed', {
              detail: {
                zoom: zoom,
              },
            }),
          );
          active.original = null;
          active.zoomed = null;
          active.zoomedHd = null;
          active.template = null;
          resolve(zoom);
        };
        isAnimating = true;
        document.body.classList.remove('medium-zoom--opened');
        active.zoomed.style.transform = '';
        if (active.zoomedHd) {
          active.zoomedHd.style.transform = '';
        }
        if (active.template) {
          active.template.style.transition = 'opacity 150ms';
          active.template.style.opacity = 0;
        }
        active.original.dispatchEvent(
          createCustomEvent('medium-zoom:close', {
            detail: {
              zoom: zoom,
            },
          }),
        );
        active.zoomed.addEventListener('transitionend', _handleCloseEnd);
      });
    };
    var toggle = function toggle() {
      var _ref3 = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
        target = _ref3.target;
      if (active.original) {
        return close();
      }
      return open({
        target: target,
      });
    };
    var getOptions = function getOptions() {
      return zoomOptions;
    };
    var getImages = function getImages() {
      return images;
    };
    var getZoomedImage = function getZoomedImage() {
      return active.original;
    };
    var images = [];
    var eventListeners = [];
    var isAnimating = false;
    var scrollTop = 0;
    var zoomOptions = options;
    var active = {
      original: null,
      zoomed: null,
      zoomedHd: null,
      template: null,
    };
    if (Object.prototype.toString.call(selector) === '[object Object]') {
      zoomOptions = selector;
    } else if (selector || typeof selector === 'string') {
      attach(selector);
    }
    zoomOptions = _extends(
      {
        margin: 0,
        scrollOffset: 40,
        container: null,
        template: null,
      },
      zoomOptions,
    );
    var overlay = createOverlay();
    document.addEventListener('click', _handleClick);
    document.addEventListener('keyup', _handleKeyUp);
    document.addEventListener('scroll', _handleScroll);
    window.addEventListener('resize', close);
    var zoom = {
      open: open,
      close: close,
      toggle: toggle,
      update: update,
      clone: clone,
      attach: attach,
      detach: detach,
      on: on,
      off: off,
      getOptions: getOptions,
      getImages: getImages,
      getZoomedImage: getZoomedImage,
    };
    return zoom;
  };
  return mediumZoom;
});

mediumZoom(document.querySelectorAll('div.post__content img'));