UI changes, added utilitiy services, persistance, serialization

app/js/service-persist.js

@@ -0,0 +1,58 @@
+angular.module('app').service('Persist', ['lodash', function (_) {
+  var LS_KEY = 'builds';
+
+  var buildJson = localStorage.getItem(LS_KEY);
+
+  if (buildJson) {
+    this.builds = angular.fromJson(localStorage.getItem(LS_KEY));
+  } else {
+    this.builds = {};
+  }
+
+  /**
+   * Persist a ship build in local storage.
+   *
+   * @param  {string} shipId The unique id for a model of ship
+   * @param  {string} name   The name of the build
+   * @param  {string} code   The serialized code
+   */
+  this.saveBuild = function (shipId, name, code) {
+    if (!this.builds[shipId]) {
+      this.builds[shipId] = {};
+    }
+
+    this.builds[shipId][name] = code;
+    localStorage.setItem(LS_KEY, angular.toJson(this.builds));  // Persist updated build collection to localstorage
+  }
+
+  /**
+   * Get the serialized code/string for a build. Returns null if a
+   * build is not found.
+   *
+   * @param  {string} shipId The unique id for a model of ship
+   * @param  {string} name   The name of the build
+   * @return {string}        The serialized build string.
+   */
+  this.getBuild = function (shipId, name) {
+    if (this.builds[shipId]) {
+      return this.builds[shipId][name];
+    }
+    return null;
+  }
+
+  /**
+   * Delete a build from local storage. It will also delete the ship build collection if
+   * it becomes empty
+   *
+   * @param  {string} shipId The unique id for a model of ship
+   * @param  {string} name   The name of the build
+   */
+  this.deleteBuild = function (shipId, name) {
+    delete build[shipId][name];
+    if (Object.keys(build[shipId]).length == 0) {
+      delete build[shipId];
+    }
+  }
+
+
+}]);