'use strict';

/**
 * Copyright Marc J. Schmidt. See the LICENSE file at the top-level
 * directory of this distribution and at
 * https://github.com/marcj/css-element-queries/blob/master/LICENSE.
 */
(function (root, factory) {
    if (typeof define === "function" && define.amd) {
        define(factory);
    } else if (typeof exports === "object") {
        module.exports = factory();
    } else {
        root.ResizeSensor = factory();
    }
}(typeof window !== 'undefined' ? window : this, function () {

    // Make sure it does not throw in a SSR (Server Side Rendering) situation
    if (typeof window === "undefined") {
        return null;
    }
    // Only used for the dirty checking, so the event callback count is limited to max 1 call per fps per sensor.
    // In combination with the event based resize sensor this saves cpu time, because the sensor is too fast and
    // would generate too many unnecessary events.
    var requestAnimationFrame = window.requestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        function (fn) {
            return window.setTimeout(fn, 20);
        };

    /**
     * Iterate over each of the provided element(s).
     *
     * @param {HTMLElement|HTMLElement[]} elements
     * @param {Function}                  callback
     */
    function forEachElement(elements, callback){
        var elementsType = Object.prototype.toString.call(elements);
        var isCollectionTyped = ('[object Array]' === elementsType
            || ('[object NodeList]' === elementsType)
            || ('[object HTMLCollection]' === elementsType)
            || ('[object Object]' === elementsType)
            || ('undefined' !== typeof jQuery && elements instanceof jQuery) //jquery
            || ('undefined' !== typeof Elements && elements instanceof Elements) //mootools
        );
        var i = 0, j = elements.length;
        if (isCollectionTyped) {
            for (; i < j; i++) {
                callback(elements[i]);
            }
        } else {
            callback(elements);
        }
    }

    /**
    * Get element size
    * @param {HTMLElement} element
    * @returns {Object} {width, height}
    */
    function getElementSize(element) {
        if (!element.getBoundingClientRect) {
            return {
                width: element.offsetWidth,
                height: element.offsetHeight
            }
        }

        var rect = element.getBoundingClientRect();
        return {
            width: Math.round(rect.width),
            height: Math.round(rect.height)
        }
    }

    /**
     * Class for dimension change detection.
     *
     * @param {Element|Element[]|Elements|jQuery} element
     * @param {Function} callback
     *
     * @constructor
     */
    var ResizeSensor = function(element, callback) {
        /**
         *
         * @constructor
         */
        function EventQueue() {
            var q = [];
            this.add = function(ev) {
                q.push(ev);
            };

            var i, j;
            this.call = function(sizeInfo) {
                for (i = 0, j = q.length; i < j; i++) {
                    q[i].call(this, sizeInfo);
                }
            };

            this.remove = function(ev) {
                var newQueue = [];
                for(i = 0, j = q.length; i < j; i++) {
                    if(q[i] !== ev) newQueue.push(q[i]);
                }
                q = newQueue;
            };

            this.length = function() {
                return q.length;
            }
        }

        /**
         *
         * @param {HTMLElement} element
         * @param {Function}    resized
         */
        function attachResizeEvent(element, resized) {
            if (!element) return;
            if (element.resizedAttached) {
                element.resizedAttached.add(resized);
                return;
            }

            element.resizedAttached = new EventQueue();
            element.resizedAttached.add(resized);

            element.resizeSensor = document.createElement('div');
            element.resizeSensor.dir = 'ltr';
            element.resizeSensor.className = 'resize-sensor';
            var style = 'position: absolute; left: -10px; top: -10px; right: 0; bottom: 0; overflow: hidden; z-index: -1; visibility: hidden; max-width: 100%';
            var styleChild = 'position: absolute; left: 0; top: 0; transition: 0s;';

            element.resizeSensor.style.cssText = style;
            element.resizeSensor.innerHTML =
                '<div class="resize-sensor-expand" style="' + style + '">' +
                    '<div style="' + styleChild + '"></div>' +
                '</div>' +
                '<div class="resize-sensor-shrink" style="' + style + '">' +
                    '<div style="' + styleChild + ' width: 200%; height: 200%"></div>' +
                '</div>';
            element.appendChild(element.resizeSensor);

            var computedStyle = window.getComputedStyle(element);
            var position = computedStyle ? computedStyle.getPropertyValue('position') : null;
            if ('absolute' !== position && 'relative' !== position && 'fixed' !== position) {
                element.style.position = 'relative';
            }

            var expand = element.resizeSensor.childNodes[0];
            var expandChild = expand.childNodes[0];
            var shrink = element.resizeSensor.childNodes[1];
            var dirty, rafId;
            var size = getElementSize(element);
            var lastWidth = size.width;
            var lastHeight = size.height;
            var initialHiddenCheck = true;
            var lastAnimationFrame = 0;

            var resetExpandShrink = function () {
                expandChild.style.width = '100000px';
                expandChild.style.height = '100000px';

                expand.scrollLeft = 100000;
                expand.scrollTop = 100000;

                shrink.scrollLeft = 100000;
                shrink.scrollTop = 100000;
            };

            var reset = function() {
                // Check if element is hidden
                if (initialHiddenCheck) {
                    var invisible = element.offsetWidth === 0 && element.offsetHeight === 0;
                    if (invisible) {
                        // Check in next frame
                        if (!lastAnimationFrame){
                            lastAnimationFrame = requestAnimationFrame(function(){
                                lastAnimationFrame = 0;

                                reset();
                            });
                        }

                        return;
                    } else {
                        // Stop checking
                        initialHiddenCheck = false;
                    }
                }

                resetExpandShrink();
            };
            element.resizeSensor.resetSensor = reset;

            var onResized = function() {
                rafId = 0;

                if (!dirty) return;

                lastWidth = size.width;
                lastHeight = size.height;

                if (element.resizedAttached) {
                    element.resizedAttached.call(size);
                }
            };

            var onScroll = function() {
                size = getElementSize(element);
                dirty = size.width !== lastWidth || size.height !== lastHeight;

                if (dirty && !rafId) {
                    rafId = requestAnimationFrame(onResized);
                }

                reset();
            };

            var addEvent = function(el, name, cb) {
                if (el.attachEvent) {
                    el.attachEvent('on' + name, cb);
                } else {
                    el.addEventListener(name, cb);
                }
            };

            addEvent(expand, 'scroll', onScroll);
            addEvent(shrink, 'scroll', onScroll);

            // Fix for custom Elements
            requestAnimationFrame(reset);
        }

        forEachElement(element, function(elem){
            attachResizeEvent(elem, callback);
        });

        this.detach = function(ev) {
            ResizeSensor.detach(element, ev);
        };

        this.reset = function() {
            element.resizeSensor.resetSensor();
        };
    };

    ResizeSensor.reset = function(element, ev) {
        forEachElement(element, function(elem){
            elem.resizeSensor.resetSensor();
        });
    };

    ResizeSensor.detach = function(element, ev) {
        forEachElement(element, function(elem){
            if (!elem) return;
            if(elem.resizedAttached && typeof ev === "function"){
                elem.resizedAttached.remove(ev);
                if(elem.resizedAttached.length()) return;
            }
            if (elem.resizeSensor) {
                if (elem.contains(elem.resizeSensor)) {
                    elem.removeChild(elem.resizeSensor);
                }
                delete elem.resizeSensor;
                delete elem.resizedAttached;
            }
        });
    };

    return ResizeSensor;

}));