define([
    '/api/config?cb=' + Math.random().toString(16).slice(2),
    '/customize/messages.js',
    '/customize/store.js',
    '/bower_components/chainpad-crypto/crypto.js',
    '/bower_components/alertifyjs/dist/js/alertify.js',
    '/bower_components/spin.js/spin.min.js',
    '/common/clipboard.js',

    '/customize/fsStore.js',
    '/customize/user.js',

    '/bower_components/jquery/dist/jquery.min.js',
], function (Config, Messages, Store, Crypto, Alertify, Spinner, Clipboard, FS, User) {
/*  This file exposes functionality which is specific to Cryptpad, but not to
    any particular pad type. This includes functions for committing metadata
    about pads to your local storage for future use and improved usability.

    Additionally, there is some basic functionality for import/export.
*/
    var $ = window.jQuery;

    // When set to true, USE_FS_STORE becomes the default store, but the localStorage store is
    // still loaded for migration purpose. When false, the localStorage is used.
    var USE_FS_STORE = true;

    var storeToUse = USE_FS_STORE ? FS : Store;

    var common = {
        User: User,
        Messages: Messages,
    };
    var store;
    var fsStore;
    var userProxy;
    var userStore;

    var find = common.find = function (map, path) {
        return (map && path.reduce(function (p, n) {
            return typeof(p[n]) !== 'undefined' && p[n];
        }, map));
    };

    var getStore = common.getStore = function (legacy) {
        if (!legacy && userStore) { return userStore; }
        if ((!USE_FS_STORE || legacy) && store) { return store; }
        if (USE_FS_STORE && !legacy && fsStore) { return fsStore; }
        throw new Error("Store is not ready!");
    };

    var getWebsocketURL = common.getWebsocketURL = function () {
        if (!Config.websocketPath) { return Config.websocketURL; }
        var path = Config.websocketPath;
        if (/^ws{1,2}:\/\//.test(path)) { return path; }

        var protocol = window.location.protocol.replace(/http/, 'ws');
        var host = window.location.host;
        var url = protocol + '//' + host + path;

        return url;
    };

    /*
     *  cb(err, proxy);
     */
    var authorize = common.authorize = function (cb) {
        console.log("Authorizing");

        User.session(void 0, function (err, secret) {
            if (!secret) {
                // user is not authenticated
                cb('user is not authenticated', void 0);
            }

            // for now we assume that things always work
            User.connect(secret, function (err, proxy) {
                cb(void 0, proxy);
            });
        });
    };

    // HERE
    var deauthorize = common.deauthorize = function (cb) {
        console.log("Deauthorizing");

        // erase session data from storage
        User.session(null, function (err) {
            if (err) {
                console.error(err);
            }
            /*
                TODO better abort for this stuff...
            */
            userStore = undefined;
            userProxy = undefined;
        });
    };

    Store.ready(function (err, Store) {
        if (err) {
            console.error(err);
            return;
        }
        store = Store;
    });

    // var isArray = function (o) { return Object.prototype.toString.call(o) === '[object Array]'; };
    var isArray = common.isArray = $.isArray;

    var fixHTML = common.fixHTML = function (html) {
        return html.replace(/</g, '&lt;');
    };

    var truncate = common.truncate = function (text, len) {
        if (typeof(text) === 'string' && text.length > len) {
            return text.slice(0, len) + '…';
        }
        return text;
    };

    var hexToBase64 = common.hexToBase64 = function (hex) {
        var hexArray = hex
            .replace(/\r|\n/g, "")
            .replace(/([\da-fA-F]{2}) ?/g, "0x$1 ")
            .replace(/ +$/, "")
            .split(" ");
        var byteString = String.fromCharCode.apply(null, hexArray);
        return window.btoa(byteString).replace(/\//g, '-').slice(0,-2);
    };

    var base64ToHex = common.base64ToHex = function (b64String) {
        var hexArray = [];
        atob(b64String.replace(/-/g, '/')).split("").forEach(function(e){
            var h = e.charCodeAt(0).toString(16);
            if (h.length === 1) { h = "0"+h; }
            hexArray.push(h);
        });
        return hexArray.join("");
    };


    var parseHash = common.parseHash = function (hash) {
        var parsed = {};
        if (hash.slice(0,1) !== '/' && hash.length >= 56) {
            // Old hash
            parsed.channel = hash.slice(0, 32);
            parsed.key = hash.slice(32);
            parsed.version = 0;
            return parsed;
        }
        var hashArr = hash.split('/');
        if (hashArr[1] && hashArr[1] === '1') {
            parsed.version = 1;
            parsed.mode = hashArr[2];
            parsed.channel = hashArr[3];
            parsed.key = hashArr[4];
            parsed.present = hashArr[5] && hashArr[5] === 'present';
            return parsed;
        }
        return;
    };
    var getEditHashFromKeys = common.getEditHashFromKeys = function (chanKey, keys) {
        if (typeof keys === 'string') {
            return chanKey + keys;
        }
        return '/1/edit/' + hexToBase64(chanKey) + '/' + Crypto.b64RemoveSlashes(keys.editKeyStr);
    };
    var getViewHashFromKeys = common.getViewHashFromKeys = function (chanKey, keys) {
        if (typeof keys === 'string') {
            return;
        }
        return '/1/view/' + hexToBase64(chanKey) + '/' + Crypto.b64RemoveSlashes(keys.viewKeyStr);
    };
    var getHashFromKeys = common.getHashFromKeys = getEditHashFromKeys;

    var getSecrets = common.getSecrets = function (secretHash) {
        var secret = {};
        if (/#\?path=/.test(window.location.href)) {
            var arr = window.location.hash.match(/\?path=(.+)/);
            common.initialPath = arr[1] || undefined;
            window.location.hash = '';
        }
        if (!secretHash && !/#/.test(window.location.href)) {
            secret.keys = Crypto.createEditCryptor();
            secret.key = Crypto.createEditCryptor().editKeyStr;
        } else {
            var hash = secretHash || window.location.hash.slice(1);
            if (hash.length === 0) {
                secret.keys = Crypto.createEditCryptor();
                secret.key = Crypto.createEditCryptor().editKeyStr;
                return secret;
            }
            // old hash system : #{hexChanKey}{cryptKey}
            // new hash system : #/{hashVersion}/{b64ChanKey}/{cryptKey}
            if (hash.slice(0,1) !== '/' && hash.length >= 56) {
                // Old hash
                secret.channel = hash.slice(0, 32);
                secret.key = hash.slice(32);
            }
            else {
                // New hash
                var hashArray = hash.split('/');
                if (hashArray.length < 4) {
                    common.alert("Unable to parse the key");
                    throw new Error("Unable to parse the key");
                }
                var version = hashArray[1];
                /*if (version === "1") {
                    secret.channel = base64ToHex(hashArray[2]);
                    secret.key = hashArray[3].replace(/-/g, '/');
                    if (secret.channel.length !== 32 || secret.key.length !== 24) {
                        common.alert("The channel key and/or the encryption key is invalid");
                        throw new Error("The channel key and/or the encryption key is invalid");
                    }
                }*/
                if (version === "1") {
                    var mode = hashArray[2];
                    if (mode === 'edit') {
                        secret.channel = base64ToHex(hashArray[3]);
                        var keys = Crypto.createEditCryptor(hashArray[4].replace(/-/g, '/'));
                        secret.keys = keys;
                        secret.key = keys.editKeyStr;
                        if (secret.channel.length !== 32 || secret.key.length !== 24) {
                            common.alert("The channel key and/or the encryption key is invalid");
                            throw new Error("The channel key and/or the encryption key is invalid");
                        }
                    }
                    else if (mode === 'view') {
                        secret.channel = base64ToHex(hashArray[3]);
                        secret.keys = Crypto.createViewCryptor(hashArray[4].replace(/-/g, '/'));
                        if (secret.channel.length !== 32) {
                            common.alert("The channel key is invalid");
                            throw new Error("The channel key is invalid");
                        }
                    }
                }
            }
        }
        return secret;
    };

    var uint8ArrayToHex = common.uint8ArrayToHex = function (a) {
        // call slice so Uint8Arrays work as expected
        return Array.prototype.slice.call(a).map(function (e, i) {
            var n = Number(e & 0xff).toString(16);
            if (n === 'NaN') {
                throw new Error('invalid input resulted in NaN');
            }

            switch (n.length) {
                case 0: return '00'; // just being careful, shouldn't happen
                case 1: return '0' + n;
                case 2: return n;
                default: throw new Error('unexpected value');
            }
        }).join('');
    };

    var createChannelId = common.createChannelId = function () {
        var id = uint8ArrayToHex(Crypto.Nacl.randomBytes(16));
        if (id.length !== 32 || /[^a-f0-9]/.test(id)) {
            throw new Error('channel ids must consist of 32 hex characters');
        }
        return id;
    };

    var replaceHash = common.replaceHash = function (hash) {
        if (window.history && window.history.replaceState) {
            if (!/^#/.test(hash)) { hash = '#' + hash; }
            return void window.history.replaceState({}, window.document.title, hash);
        }
        window.location.hash = hash;
    };

    var storageKey = common.storageKey = 'CryptPad_RECENTPADS';

    /*
     *  localStorage formatting
     */
    /*
        the first time this gets called, your local storage will migrate to a
        new format. No more indices for values, everything is named now.

        * href
        * atime (access time)
        * title
        * ??? // what else can we put in here?
    */
    var migrateRecentPads = common.migrateRecentPads = function (pads) {
        return pads.map(function (pad) {
            if (isArray(pad)) {
                var href = pad[0];
                var hash;
                href.replace(/\#(.*)$/, function (a, h) {
                    hash = h;
                });

                return {
                    href: pad[0],
                    atime: pad[1],
                    title: pad[2] || hash && hash.slice(0,8),
                    ctime: pad[1],
                };
            } else if (typeof(pad) === 'object') {
                if (!pad.ctime) { pad.ctime = pad.atime; }
                if (!pad.title) {
                    pad.href.replace(/#(.*)$/, function (x, hash) {
                        pad.title = hash.slice(0,8);
                    });
                }
                pad.href = pad.href.replace(/^https:\/\/beta\.cryptpad\.fr/,
                    'https://cryptpad.fr');
                return pad;
            } else {
                console.error("[Cryptpad.migrateRecentPads] pad had unexpected value");
                console.log(pad);
                return {};
            }
        });
    };

    var getHash = common.getHash = function () {
        return window.location.hash.slice(1);
    };

    var parsePadUrl = common.parsePadUrl = function (href) {
        var patt = /^https*:\/\/([^\/]*)\/(.*?)\//i;

        var ret = {};
        var hash = href.replace(patt, function (a, domain, type, hash) {
            ret.domain = domain;
            ret.type = type;
            return '';
        });
        ret.hash = hash.replace(/#/g, '');
        return ret;
    };

    var isNameAvailable = function (title, parsed, pads) {
        return !pads.some(function (pad) {
            // another pad is already using that title
            if (pad.title === title) {
                return true;
            }
        });
    };

    // Create untitled documents when no name is given
    var getDefaultName = common.getDefaultName = function (parsed, recentPads) {
        var type = parsed.type;
        var untitledIndex = 1;
        var name = (Messages.type)[type] + ' - ' + new Date().toString().split(' ').slice(0,4).join(' ');
        return name;
        /*
         * Pad titles are shared in the document so it does not make sense anymore to avoid duplicates
          if (isNameAvailable(name, parsed, recentPads)) { return name; }
          while (!isNameAvailable(name + ' - ' + untitledIndex, parsed, recentPads)) { untitledIndex++; }
          return name + ' - ' + untitledIndex;
        */
    };
    var isDefaultName = common.isDefaultName = function (parsed, title) {
        var name = getDefaultName(parsed, []);
        return title === name;
    };

    var makePad = function (href, title) {
        var now = ''+new Date();
        return {
            href: href,
            atime: now,
            ctime: now,
            title: title || window.location.hash.slice(1, 9),
        };
    };

    /* Sort pads according to how recently they were accessed */
    var mostRecent = common.mostRecent = function (a, b) {
        return new Date(b.atime).getTime() - new Date(a.atime).getTime();
    };

    // STORAGE
    var setPadAttribute = common.setPadAttribute = function (attr, value, cb, legacy) {
        getStore(legacy).set([getHash(), attr].join('.'), value, function (err, data) {
            cb(err, data);
        });
    };
    var setAttribute = common.setAttribute = function (attr, value, cb, legacy) {
        getStore(legacy).set(["cryptpad", attr].join('.'), value, function (err, data) {
            cb(err, data);
        });
    };


    // STORAGE
    var getPadAttribute = common.getPadAttribute = function (attr, cb, legacy) {
        getStore(legacy).get([getHash(), attr].join('.'), function (err, data) {
            cb(err, data);
        });
    };
    var getAttribute = common.getAttribute = function (attr, cb, legacy) {
        getStore(legacy).get(["cryptpad", attr].join('.'), function (err, data) {
            cb(err, data);
        });
    };


    // STORAGE
    /* fetch and migrate your pad history from localStorage */
    var getRecentPads = common.getRecentPads = function (cb, legacy) {
        getStore(legacy).get(storageKey, function (err, recentPads) {
            if (isArray(recentPads)) {
                cb(void 0, migrateRecentPads(recentPads));
                return;
            }
            cb(void 0, []);
        });
    };

    // STORAGE
    /* commit a list of pads to localStorage */
    var setRecentPads = common.setRecentPads = function (pads, cb, legacy) {
        getStore(legacy).set(storageKey, pads, function (err, data) {
            cb(err, data);
        });
    };

    // STORAGE
    var forgetFSPad = function (href, cb) {
        getStore().forgetPad(href, cb);
    };
    var forgetPad = common.forgetPad = function (href, cb, legacy) {
        var parsed = parsePadUrl(href);

        var callback = function (err, data) {
            if (err) {
                cb(err);
                return;
            }

            getStore(legacy).keys(function (err, keys) {
                if (err) {
                    cb(err);
                    return;
                }
                var toRemove = keys.filter(function (k) {
                    return k.indexOf(parsed.hash) === 0;
                });

                if (!toRemove.length) {
                    cb();
                    return;
                }
                getStore(legacy).removeBatch(toRemove, function (err, data) {
                    cb(err, data);
                });
            });
        };

        if (USE_FS_STORE && !legacy) {
            // TODO implement forgetPad in store.js
            forgetFSPad(href, callback);
            return;
        }

        getRecentPads(function (err, recentPads) {
            setRecentPads(recentPads.filter(function (pad) {
                var p = parsePadUrl(pad.href);
                // find duplicates
                if (parsed.hash === p.hash && parsed.type === p.type) {
                    console.log("Found a duplicate");
                    return;
                }
                return true;
            }), callback, legacy);
        }, legacy);



        if (typeof(getStore(legacy).forgetPad) === "function") {
            // TODO implement forgetPad in store.js
            getStore(legacy).forgetPad(href, callback);
        }
    };

    // STORAGE
    var setPadTitle = common.setPadTitle = function (name, cb) {
        var href = window.location.href;
        var parsed = parsePadUrl(href);
        getRecentPads(function (err, recent) {
            if (err) {
                cb(err);
                return;
            }

            var contains;
            var renamed = recent.map(function (pad) {
                var p = parsePadUrl(pad.href);

                if (p.type !== parsed.type) { return pad; }

                var shouldUpdate = p.hash === parsed.hash;

                // Version 1 : we have up to 4 differents hash for 1 pad, keep the strongest :
                // Edit > Edit (present) > View > View (present)
                var pHash = parseHash(p.hash);
                var parsedHash = parseHash(parsed.hash);
                if (!shouldUpdate && pHash.version === 1 && parsedHash.version === 1 && pHash.channel === parsedHash.channel) {
                    if (pHash.mode === 'view' && parsedHash.mode === 'edit') { shouldUpdate = true; }
                    else if (pHash.mode === parsedHash.mode && pHash.present) { shouldUpdate = true; }
                    else {
                        // Editing a "weaker" version of a stored hash : update the date and do not push the current hash
                        pad.atime = new Date().toISOString();
                        contains = true;
                        return pad;
                    }
                }

                if (shouldUpdate) {
                    contains = true;
                    // update the atime
                    pad.atime = new Date().toISOString();

                    // set the name
                    pad.title = name;
                    pad.href = href;
                }
                return pad;
            });

            if (!contains) {
                var data = makePad(href, name);
                renamed.push(data);
                if (USE_FS_STORE && typeof(getStore().addPad) === "function") {
                    getStore().addPad(href, common.initialPath, name);
                }
            }

            setRecentPads(renamed, function (err, data) {
                cb(err, data);
            });
        });
    };

    // STORAGE
    var getPadTitle = common.getPadTitle = function (cb) {
        var href = window.location.href;
        var parsed = parsePadUrl(window.location.href);
        var hashSlice = window.location.hash.slice(1,9);
        var title = '';

        getRecentPads(function (err, pads) {
            if (err) {
                cb(err);
                return;
            }
            pads.some(function (pad) {
                var p = parsePadUrl(pad.href);
                if (p.hash === parsed.hash && p.type === parsed.type) {
                    title = pad.title || hashSlice;
                    return true;
                }
            });

            if (title === '') { title = getDefaultName(parsed, pads); }

            cb(void 0, title);
        });
    };

    // STORAGE
    var causesNamingConflict = common.causesNamingConflict = function (title, cb) {
        var href = window.location.href;

        var parsed = parsePadUrl(href);
        getRecentPads(function (err, pads) {
            if (err) {
                cb(err);
                return;
            }
            var conflicts = pads.some(function (pad) {
                // another pad is already using that title
                if (pad.title === title) {
                    var p = parsePadUrl(pad.href);

                    if (p.type === parsed.type && p.hash === parsed.hash) {
                        // the duplicate pad has the same type and hash
                        // allow renames
                    } else {
                        // it's an entirely different pad... it conflicts
                        return true;
                    }
                }
            });
            cb(void 0, conflicts);
        });
    };

    // local name?
    common.ready = function (f) {
        var state = 0;

        var env = {};

        var cb = function () {
            f(void 0, env);
        };

        storeToUse.ready(function (err, store) {
            common.store = env.store = store;
            if (USE_FS_STORE) {
                fsStore = store;
            }

            $(function() {
                // Race condition : if document.body is undefined when alertify.js is loaded, Alertify
                // won't work. We have to reset it now to make sure it uses a correct "body"

                Alertify.reset();
                if($('#pad-iframe').length) {
                    var $iframe = $('#pad-iframe');
                    var iframe = $iframe[0];
                    var iframeDoc = iframe.contentDocument || iframe.contentWindow.document;
                    if (iframeDoc.readyState === 'complete') {
                        cb();
                        return;
                    }
                    $iframe.load(cb);
                    return;
                }
                cb();
            });
            return;
/*
            authorize(function (err, proxy) {
            /*
                TODO
                listen for log(in|out) events
                update information accordingly
            * /

                store.change(function (data) {
                    if (data.key === User.localKey) {
                        // HERE
                        if (!data.newValue) {
                            deauthorize(function (err) {
                                console.log("Deauthorized!!");
                            });
                        } else {
                            authorize(function (err, proxy) {
                                if (err) {
                                    // not logged in
                                }
                                if (!proxy) {
                                    userProxy = proxy;
                                    userStore =  User.prepareStore(proxy);
                                }
                            });
                        }
                    }
                });

                if (err) {
                    // not logged in
                }
                if (!proxy) {
                    cb();
                    return;
                }
                userProxy = env.proxy = proxy;
                userStore = env.userStore = User.prepareStore(proxy);
                cb();

            }); */
        }, common);
    };

    var errorHandlers = [];
    common.onError = function (h) {
        if (typeof h !== "function") { return; }
        errorHandlers.push(h);
    };
    common.storeError = function () {
        errorHandlers.forEach(function (h) {
            if (typeof h === "function") {
                h({type: "store"});
            }
        });
    };

    /*
     *  Saving files
     */
    var fixFileName = common.fixFileName = function (filename) {
        return filename.replace(/ /g, '-').replace(/[\/\?]/g, '_')
            .replace(/_+/g, '_');
    };

    var importContent = common.importContent = function (type, f) {
        return function () {
            var $files = $('<input type="file">').click();
            $files.on('change', function (e) {
                var file = e.target.files[0];
                var reader = new FileReader();
                reader.onload = function (e) { f(e.target.result, file); };
                reader.readAsText(file, type);
            });
        };
    };

    /*
     * Buttons
     */
    var renamePad = common.renamePad = function (title, callback) {
        if (title === null) { return; }

        if (title.trim() === "") {
            var parsed = parsePadUrl(window.location.href);
            title = getDefaultName(parsed);
        }

        common.setPadTitle(title, function (err, data) {
            if (err) {
                console.log("unable to set pad title");
                console.log(err);
                return;
            }
            callback(null, title);
        });
        /* Pad titles are shared in the document. We don't check for duplicates anymore.
         common.causesNamingConflict(title, function (err, conflicts) {
            if (err) {
                console.log("Unable to determine if name caused a conflict");
                console.error(err);
                callback(err, title);
                return;
            }

            if (conflicts) {
                common.alert(Messages.renameConflict);
                return;
            }

            common.setPadTitle(title, function (err, data) {
                if (err) {
                    console.log("unable to set pad title");
                    console.log(err);
                    return;
                }
                callback(null, title);
            });
        });
        */
    };
    var createButton = common.createButton = function (type, rightside, data, callback) {
        var button;
        var size = "17px";
        switch (type) {
            case 'export':
                button = $('<button>', {
                    title: Messages.exportButton + '\n' + Messages.exportButtonTitle,
                    'class': "fa fa-download",
                    style: 'font:'+size+' FontAwesome'
                });
                if (callback) {
                    button.click(callback);
                }
                break;
            case 'import':
                button = $('<button>', {
                    title: Messages.importButton + '\n' + Messages.importButtonTitle,
                    'class': "fa fa-upload",
                    style: 'font:'+size+' FontAwesome'
                });
                if (callback) {
                    button.click(common.importContent('text/plain', function (content, file) {
                        callback(content, file);
                    }));
                }
                break;
            case 'rename':
                button = $('<button>', {
                    id: 'name-pad',
                    title: Messages.renameButton + '\n' + Messages.renameButtonTitle,
                    'class': "fa fa-bookmark cryptpad-rename",
                    style: 'font:'+size+' FontAwesome'
                });
                if (data && data.suggestName && callback) {
                    var suggestName = data.suggestName;
                    button.click(function() {
                        var suggestion = suggestName();

                        common.prompt(Messages.renamePrompt, suggestion, function (title, ev) {
                            renamePad(title, callback);
                        });
                    });
                }
                break;
            case 'forget':
                button = $('<button>', {
                    id: 'cryptpad-forget',
                    title: Messages.forgetButton + '\n' + Messages.forgetButtonTitle,
                    'class': "fa fa-trash cryptpad-forget",
                    style: 'font:'+size+' FontAwesome'
                });
                if (callback) {
                    button.click(function() {
                        var href = window.location.href;
                        common.confirm(Messages.forgetPrompt, function (yes) {
                            if (!yes) { return; }
                            common.forgetPad(href, function (err, data) {
                                if (err) {
                                    console.log("unable to forget pad");
                                    console.error(err);
                                    callback(err, null);
                                    return;
                                }
                                var parsed = common.parsePadUrl(href);
                                callback(null, common.getDefaultName(parsed, []));
                            });
                        });

                    });
                }
                break;
            case 'username':
                button = $('<button>', {
                    title: Messages.userButton + '\n' + Messages.userButtonTitle
                }).html('<span class="fa fa-user" style="font-family:FontAwesome;"></span>');
                if (data && typeof data.lastName !== "undefined" && callback) {
                    button.click(function() {
                        common.prompt(Messages.changeNamePrompt, data.lastName, function (newName) {
                            callback(newName);
                        });
                    });
                }
                break;
            case 'editshare':
                button = $('<button>', {
                    title: Messages.editShareTitle,
                }).text(Messages.editShare);
                if (data && data.editHash) {
                    var editHash = data.editHash;
                    button.click(function () {
                        var baseUrl = window.location.origin + window.location.pathname + '#';
                        var url = baseUrl + editHash;
                        var success = Clipboard.copy(url);
                        if (success) {
                            common.log(Messages.shareSuccess);
                            common.findOKButton().click();
                            return;
                        }
                    });
                }
                break;
            case 'viewshare':
                button = $('<button>', {
                    title: Messages.viewShareTitle,
                }).text(Messages.viewShare);
                if (data && data.viewHash) {
                    button.click(function () {
                        var baseUrl = window.location.origin + window.location.pathname + '#';
                        var url = baseUrl + data.viewHash;
                        var success = Clipboard.copy(url);
                        if (success) {
                            common.log(Messages.shareSuccess);
                            common.findOKButton().click();
                            return;
                        }
                    });
                }
                break;
            case 'viewopen':
                button = $('<button>', {
                    title: Messages.viewOpenTitle,
                }).text(Messages.viewOpen);
                if (data && data.viewHash) {
                    button.click(function () {
                        var baseUrl = window.location.origin + window.location.pathname + '#';
                        var url = baseUrl + data.viewHash;
                        common.findOKButton().click();
                        window.open(url);
                    });
                }
                break;
            case 'present':
                button = $('<button>', {
                    title: Messages.presentButton + '\n' + Messages.presentButtonTitle,
                    'class': "fa fa-play-circle cryptpad-present-button", // class used in slide.js
                    style: 'font:'+size+' FontAwesome'
                });
                break;
            case 'source':
                button = $('<button>', {
                    title: Messages.sourceButton + '\n' + Messages.sourceButtonTitle,
                    'class': "fa fa-stop-circle cryptpad-source-button", // class used in slide.js
                    style: 'font:'+size+' FontAwesome'
                });
                break;
             default:
                button = $('<button>', {
                    'class': "fa fa-question",
                    style: 'font:'+size+' FontAwesome'
                });
        }
        if (rightside) {
            button.addClass('rightside-button');
        }
        return button;
    };

    /*
     *  Alertifyjs
     */

    // TODO: remove styleAlerts in all the apps
    var styleAlerts = common.styleAlerts = function () {};

    var findCancelButton = common.findCancelButton = function () {
        return $('button.cancel');
    };

    var findOKButton = common.findOKButton = function () {
        return $('button.ok');
    };

    var listenForKeys = function (yes, no) {
        var handler = function (e) {
            switch (e.which) {
                case 27: // cancel
                    if (typeof(no) === 'function') { no(e); }
                    no();
                    break;
                case 13: // enter
                    if (typeof(yes) === 'function') { yes(e); }
                    break;
            }
        };

        $(window).keyup(handler);
        return handler;
    };

    var stopListening = function (handler) {
        $(window).off('keyup', handler);
    };

    common.alert = function (msg, cb) {
        cb = cb || function () {};
        var keyHandler = listenForKeys(function (e) { // yes
            findOKButton().click();
        });
        Alertify.alert(msg, function (ev) {
            cb(ev);
            stopListening(keyHandler);
        });
    };

    common.prompt = function (msg, def, cb, opt) {
        opt = opt || {};
        cb = cb || function () {};

        var keyHandler = listenForKeys(function (e) { // yes
            findOKButton().click();
        }, function (e) { // no
            findCancelButton().click();
        });

        Alertify
            .defaultValue(def || '')
            .okBtn(opt.ok || Messages.okButton || 'OK')
            .cancelBtn(opt.cancel || Messages.cancelButton || 'Cancel')
            .prompt(msg, function (val, ev) {
                cb(val, ev);
                stopListening(keyHandler);
            }, function (ev) {
                cb(null, ev);
                stopListening(keyHandler);
            });
    };

    common.confirm = function (msg, cb, opt) {
        opt = opt || {};
        cb = cb || function () {};
        var keyHandler = listenForKeys(function (e) {
            findOKButton().click();
        }, function (e) {
            findCancelButton().click();
        });

        Alertify
            .okBtn(opt.ok || Messages.okButton || 'OK')
            .cancelBtn(opt.cancel || Messages.cancelButton || 'Cancel')
            .confirm(msg, function () {
                cb(true);
                stopListening(keyHandler);
            }, function () {
                cb(false);
                stopListening(keyHandler);
            });
    };

    common.log = function (msg) {
        Alertify.success(msg);
    };

    common.warn = function (msg) {
        Alertify.error(msg);
    };

    /*
     *  spinner
     */
    common.spinner = function (parent) {
        var $target = $('<div>', {
            //
        }).hide();

        $(parent).append($target);

        var opts = {
            lines: 9, // The number of lines to draw
            length: 12, // The length of each line
            width: 11, // The line thickness
            radius: 20, // The radius of the inner circle
            scale: 2, // Scales overall size of the spinner
            corners: 1, // Corner roundness (0..1)
            color: '#777', // #rgb or #rrggbb or array of colors
            opacity: 0.3, // Opacity of the lines
            rotate: 31, // The rotation offset
            direction: 1, // 1: clockwise, -1: counterclockwise
            speed: 0.9, // Rounds per second
            trail: 49, // Afterglow percentage
            fps: 20, // Frames per second when using setTimeout() as a fallback for CSS
            zIndex: 2e9, // The z-index (defaults to 2000000000)
            className: 'spinner', // The CSS class to assign to the spinner
            top: '50%', // Top position relative to parent
            left: '50%', // Left position relative to parent
            shadow: false, // Whether to render a shadow
            hwaccel: false, // Whether to use hardware acceleration
            position: 'absolute', // Element positioning
        };
        var spinner = new Spinner(opts).spin($target[0]);

        return {
            show: function () {
                $target.show();
                return this;
            },
            hide: function () {
                $target.hide();
                return this;
            },
            get: function () {
                return spinner;
            },
        };
    };

    Messages._applyTranslation();

    return common;
});