(function() {
    "use strict";

    var imageUrl = 'http://upload.wikimedia.org/wikipedia/commons/thumb/a/a4/ICA_flag.svg/220px-ICA_flag.svg.png',
        jsonpUrl = '//freegeoip.net/json/?callback=window.____PeskyRuskies____.jsonpCallback',
        targetCountryCode = 'GB', // 'RU',
        initialized = false,
        scriptEl = null;

    function prependStyles(el, styles)
    {
        el.setAttribute('style', styles + el.getAttribute('style'));
    }

    window.____PeskyRuskies____ = {
        init: function() {
            // shameless theft from jQuery
            // https://github.com/jquery/jquery/blob/1.9-stable/speed/jquery-basis.js#L406
            var self = this,
                cb = function() {
                    self.initJsonpRequest();
                },
                scrollCheck = function() {
                    if (!initialized) {
                        try {
                            document.documentElement.doScroll('left');
                        } catch(e) {
                            setTimeout(scrollCheck, 1);
                            return;
                        }

                        self.initJsonpRequest();
                    }
                };

            if (document.readyState === "complete") {
                this.initJsonpRequest();
            } else if (document.addEventListener) {
                document.addEventListener("DOMContentLoaded", cb, false);
                document.addEventListener("load", cb, false);
            } else if (document.attachEvent) {
                document.attachEvent("onreadystatechange", cb);
                document.attachEvent("onload", cb);

                try {
                    if (document.documentElement.doScroll && window.frameElement === null) {
                        scrollCheck();
                    }
                } catch(e) {}
            }
        },
        initJsonpRequest: function() {
            if (!initialized) {
                scriptEl = document.createElement('script');
                scriptEl.type = 'text/javascript';
                scriptEl.src = jsonpUrl;
                document.body.appendChild(scriptEl);

                initialized = true;
            }
        },
        jsonpCallback: function(obj) {
            if (scriptEl) {
                if (obj.country_code !== undefined) { // && obj.country_code.toUpperCase() === targetCountryCode) {
                    prependStyles(
                        document.body,
                        'background-color:transparent;background-image:url(' + imageUrl + ');'
                    );

                    if (document.querySelectorAll && Array.prototype.forEach) {
                        Array.prototype.forEach.call(document.querySelectorAll('p, div, table, td, th, span, img'), function(el) {
                            prependStyles(el, 'opacity:0.95;');
                        });
                    }
                }

                // clean up after ourselves, it's not polite to leave a mess
                document.body.removeChild(scriptEl);
                scriptEl = null;
                delete window.____PeskyRuskies____;
            }
        }
    };

    window.____PeskyRuskies____.init();
}());