/**
 * @param {function} callback
 * @param {string} target
 * @param {Array} resources
 * @constructor
 */


(function (factory) {
    if (typeof define === 'function' && define.amd) {
        // AMD. Register as an anonymous module.
        define(['jquery'], factory);
    } else if (typeof module === 'object' && typeof module.exports === 'object') {
        factory(require('jquery'));
    } else {
        // Browser globals
        factory(jQuery);
    }
}(function ($) {
    $.frameReady = function (callback, targetSelector, resources, conditional) {
        /**
         * @type {window}
         */
        var targetWindow = document.querySelector(targetSelector);
        /**
         * @type {Document}
         */
        var targetDocument = null;

        var scripts = resources.filter(function (resource) {
            return resource.type === 'script';
        });
        var stylesheets = resources.filter(function (resource) {
            return resource.type === 'stylesheet';
        });

        var scriptsCount = (function () {
            var count = 0;

            /**
             * @param {Object} parentScript
             */
            function countScripts(parentScript) {
                count++;

                if (!parentScript.hasOwnProperty('deps')) {
                    return;
                }

                parentScript.deps.forEach(countScripts);
            }

            scripts.forEach(countScripts);

            return count;
        })();
        var scripsLoadedCount = 0;

        targetWindow.onload = function () {
            scripsLoadedCount = 0;

            if (typeof conditional === 'function' && conditional()) {
                return;
            }

            targetDocument = targetWindow.contentDocument;

            if (!targetDocument) {
                console.log('frameReady: Can\'t access to contentDocument.');
                return;
            }

            scripts.forEach(function (script) {
                createScript(script);
            });

            stylesheets.forEach(function (stylesheet) {
                createStylesheet(stylesheet);
            });
        };

        /**
         * @param {Object} script
         */
        function createScript(script) {
            /**
             * @type {HTMLScriptElement}
             */
            var elParent = targetWindow.contentDocument.createElement('script');
            elParent.async = false;
            elParent.onload = function () {
                scripsLoadedCount++;

                if (!script.hasOwnProperty('deps')) {
                    tryExecuteCallback();

                    return;
                }

                script.deps.forEach(function (scriptB) {
                    createScript(scriptB);
                });
            };
            elParent.setAttribute('src', script.src);

            targetDocument.body.appendChild(elParent);
        }

        /**
         * @param {Object} stylesheet
         */
        function createStylesheet(stylesheet) {
            /**
             * @type {HTMLLinkElement}
             */
            var el = targetWindow.contentDocument.createElement('link');
            el.setAttribute('href', stylesheet.src);
            el.setAttribute('rel', "stylesheet");
            el.setAttribute('type', "text/css");
            if (targetDocument.head) {
                targetDocument.head.appendChild(el);
            }
        }

        function tryExecuteCallback() {
            if (scripsLoadedCount < scriptsCount) {
                return;
            }

            targetWindow.contentWindow.eval('(' + callback.toString() + ')();');
        }
    };
}));