refactor ux language handling

src/js/services/uxLanguage.js

@@ -0,0 +1,95 @@
+'use strict';
+angular.module('copayApp.services')
+  .factory('uxLanguage', function languageService($log, lodash, gettextCatalog, amMoment, configService) {
+    var root = {};
+
+    root.availableLanguages = [{
+      name: 'English',
+      isoCode: 'en',
+    }, {
+      name: 'Français',
+      isoCode: 'fr',
+    }, {
+      name: 'Italiano',
+      isoCode: 'it',
+    }, {
+      name: 'Deutsch',
+      isoCode: 'de',
+    }, {
+      name: 'Español',
+      isoCode: 'es',
+    }, {
+      name: 'Português',
+      isoCode: 'pt',
+    }, {
+      name: 'Ελληνικά',
+      isoCode: 'el',
+    }, {
+      name: '日本語',
+      isoCode: 'ja',
+    }, {
+      name: 'Pусский',
+      isoCode: 'ru',
+    }];
+
+    root.currentLanguage = null;
+
+    root._detect = function() {
+      // Auto-detect browser language
+      var userLang, androidLang;
+
+      if (navigator && navigator.userAgent && (androidLang = navigator.userAgent.match(/android.*\W(\w\w)-(\w\w)\W/i))) {
+        userLang = androidLang[1];
+      } else {
+        // works for iOS and Android 4.x
+        userLang = navigator.userLanguage || navigator.language;
+      }
+      userLang = userLang ? (userLang.split('-', 1)[0] || 'en') : 'en';
+
+      return userLang;
+    };
+
+    root._set = function(lang) {
+      $log.debug('Setting default language: ' + lang);
+      gettextCatalog.setCurrentLanguage(lang);
+      amMoment.changeLocale(lang);
+      root.currentLanguage = lang;
+    };
+
+    root.getCurrentLanguage = function() {
+      return root.currentLanguage;
+    };
+
+    root.getCurrentLanguageName = function() {
+      return root.getName(root.currentLanguage);
+    };
+
+    root.getLanguages = function() {
+      return root.availableLanguages;
+    };
+
+    root.init = function() {
+      root._set(root._detect());
+    };
+
+    root.update = function() {
+      var userLang = configService.getSync().wallet.settings.defaultLanguage;
+
+      if (!userLang) {
+        userLang = root._detect();
+      }
+
+      if (userLang != gettextCatalog.getCurrentLanguage()) {
+        root._set(userLang);
+      }
+      return userLang;
+    };
+
+    root.getName = function(lang) {
+      return lodash.result(lodash.find(root.availableLanguages, {
+        'isoCode': lang
+      }), 'name');
+    };
+
+    return root;
+  });