/**
 * Cookie handling mini framework &
 * EU Cookie policy information layer
 *
 * created by binarity s.r.o
 * www.binarity.cz
 *
 * @returns {*}
 * @constructor
 */
var Cookies = {
    read: function(sKey) {
        return !sKey ? null : decodeURIComponent(document.cookie.replace(new RegExp("(?:(?:^|.*;)\\s*" + encodeURIComponent(sKey).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=\\s*([^;]*).*$)|^.*$"), "$1")) || null;
    },
    set: function(sKey, sValue, vEnd, sPath, sDomain, bSecure) {
        if (!sKey || /^(?:expires|max\-age|path|domain|secure)$/i.test(sKey)) { return false; }
        var sExpires = "";
        if (vEnd) {
            switch (vEnd.constructor) {
                case Number:
                    sExpires = vEnd === Infinity ? "; expires=Fri, 31 Dec 9999 23:59:59 GMT" : "; max-age=" + vEnd;
                    break;
                case String:
                    sExpires = "; expires=" + vEnd;
                    break;
                case Date:
                    sExpires = "; expires=" + vEnd.toUTCString();
                    break;
            }
        }
        document.cookie = encodeURIComponent(sKey) + "=" + encodeURIComponent(sValue) + sExpires + (sDomain ? "; domain=" + sDomain : "") + (sPath ? "; path=" + sPath : "") + (bSecure ? "; secure" : "");
        return true;
    },
    remove: function (sKey, sPath, sDomain) {
        if (!this.has(sKey)) { return false; }
        document.cookie = encodeURIComponent(sKey) + "=; expires=Thu, 01 Jan 1970 00:00:00 GMT" + (sDomain ? "; domain=" + sDomain : "") + (sPath ? "; path=" + sPath : "");
        return true;
    },
    has: function (sKey) {
        if (!sKey) { return false; }
        return (new RegExp("(?:^|;\\s*)" + encodeURIComponent(sKey).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=")).test(document.cookie);
    },
    keys: function () {
        var aKeys = document.cookie.replace(/((?:^|\s*;)[^\=]+)(?=;|$)|^\s*|\s*(?:\=[^;]*)?(?:\1|$)/g, "").split(/\s*(?:\=[^;]*)?;\s*/);
        for (var nLen = aKeys.length, nIdx = 0; nIdx < nLen; nIdx++) { aKeys[nIdx] = decodeURIComponent(aKeys[nIdx]); }
        return aKeys;
    }
};

function CookiePolicy(sPrefix, sText, sMore, sMoreURL, sUnderstand, sCookieName) {
    'use strict';

    var prefix      = sPrefix || 'bineucookie_',
        cookieName  = sCookieName || 'allowed_eu',
        text        = sText || 'Tyto webové stránky používají k poskytování služeb, personalizaci reklam a analýze návštěvnosti soubory cookie. Informace o tom, jak tyto webové stránky používáte, jsou sdíleny se společností Google. Používáním těchto webových stránek souhlasíte s použitím souborů cookie.',
        more        = sMore || 'Další informace',
        more_url    = sMoreURL || 'https://www.google.com/policies/technologies/cookies/',
        understand  = sUnderstand || 'Rozumím',
        // DOM
        layerHolder = document.createElement('div'),
        textElement = document.createElement('p'),
        moreInfoButton = document.createElement('a'),
        okButton = document.createElement('a');

    /**
     * This method checks whether cookie about cookies was set or not.
     * If it was set, this method additionally checks for its validity.
     */
    this.isValidCookie = function(sKey) {
        return Cookies.has(prefix + sKey);
    };

    /**
     * This method just adds custom styles to page header so it does not need to be all inline/
     */
    this.addStyle = function() {
        var styleElement = document.createElement('style');

        styleElement.id = prefix + 'style';
        styleElement.innerHTML += '#bin_eu_cookie_layer {opacity:1; position:fixed; padding:16px; left:0; top:0; width:100%; display:block; color:#f4f4f4; background-color:rgba(0,0,0,0.8); z-index:1000;}\r\n';
        styleElement.innerHTML += '#bin_eu_cookie_layer #bin-cookie-text {width:80%; float:left; display:inline-block;}\r\n';
        styleElement.innerHTML += '#bin_eu_cookie_layer .bin-button {padding: 8px; float:right;}\r\n';

        // Responsive version
        styleElement.innerHTML += '@media screen and (max-width:980px) {\r\n';
        styleElement.innerHTML += '\t#bin_eu_cookie_layer #bin-cookie-text {width:100%;}';
        styleElement.innerHTML += '}\r\n';

        document.head.appendChild(styleElement);
    };

    /**
     * This method accepts eu cookie policy by setting up a cookie that will inform the script next time that the policy
     * was already accepted.
     */
    this.acceptCookiePolicy = function() {
        var date = new Date();
        date.setFullYear(date.getFullYear() + 25);
        Cookies.set(prefix + cookieName, 1, date.toGMTString(), '/');

        layerHolder.parentNode.removeChild(layerHolder);
    };

    /**
     * This method adds necessary elements to the DOM
     */
    this.addElements = function() {
        layerHolder.id = "bin_eu_cookie_layer";

        textElement.id = "bin-cookie-text";
        textElement.textContent = text;

        moreInfoButton.className = 'bin-button';
        moreInfoButton.textContent = more;
        moreInfoButton.href = more_url;
        moreInfoButton.target = '_blank';

        okButton.id = 'bin-cookie-ok';
        okButton.className = 'bin-button';
        okButton.textContent = understand;
        okButton.href = 'javascript:void(0);';

        layerHolder.appendChild(textElement);
        layerHolder.appendChild(moreInfoButton);
        layerHolder.appendChild(okButton);

        document.body.appendChild(layerHolder);

        okButton.addEventListener('click', this.acceptCookiePolicy);
    };

    /**
     * Method for adding complete DOM layer to the DOM.
     */
    this.addDOMLayer = function() {
        this.addStyle();
        this.addElements();
    };

    /**
     * This method initializes the whole process of drawing eu cookie policy layer.
     */
    this.init = function() {
        if(!this.isValidCookie(cookieName)) {
            this.addDOMLayer();
        }
    };

    return this.init(); // Auto-run on setup.
}