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gaia/tv_apps/remote-control/js/settings.js

@@ -0,0 +1,80 @@
+/* global SettingsListener, evt */
+'use strict';
+
+(function(exports) {
+  var WATCH_SETTINGS = {
+    'remote-control.enabled': false,
+    'remote-control.pairing-required': false,
+    'remote-control.authorized-devices': null,
+    'remote-control.server-ip': ''
+  };
+
+  var Settings = evt({
+    _ready: false,
+    _observer: [],
+
+    start: function() {
+      for(var name in WATCH_SETTINGS) {
+        this._observer[name] = this._settingHandler.bind(this, name);
+        SettingsListener.observe(name, WATCH_SETTINGS[name],
+          this._observer[name]);
+      }
+    },
+
+    stop: function() {
+      for(var name in WATCH_SETTINGS) {
+        SettingsListener.unobserve(name, this._observer[name]);
+        this[name] = undefined;
+      }
+      this._observer = [];
+      this._ready = false;
+    },
+
+    save: function(settings) {
+      return new Promise((resolve, reject) => {
+        var validSettings = {};
+        var name;
+
+        for (name in settings) {
+          if (name in WATCH_SETTINGS) {
+            validSettings[name] = settings[name];
+          }
+        }
+        if (!Object.keys(validSettings).length) {
+          reject();
+        }
+
+        var req = SettingsListener.getSettingsLock().set(validSettings);
+        req.onsuccess = () => {
+          for (name in validSettings) {
+            this._settingHandler(name, validSettings[name]);
+          }
+          resolve();
+        };
+        req.onerror = () => {
+          reject();
+        };
+      });
+    },
+
+    _settingHandler: function(name, value) {
+      if (this[name] !== value) {
+        this[name] = value;
+        this.fire('changed', name, value);
+      }
+
+      // Check whether all settings are retrieved.
+      if (!this._ready) {
+        var hasValue = (name) => {
+          return this[name] !== undefined;
+        };
+        if (Object.keys(WATCH_SETTINGS).every(hasValue)) {
+          this._ready = true;
+          this.fire('ready');
+        }
+      }
+    }
+  });
+
+  exports.Settings = Settings;
+}(window));