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/*! elastic.js - v1.1.1 - 2013-05-24
 * https://github.com/fullscale/elastic.js
 * Copyright (c) 2013 FullScale Labs, LLC; Licensed MIT */

/*jshint browser:true */
/*global angular:true */
'use strict';

/*
 Angular.js service wrapping the elastic.js API. This module can simply
 be injected into your angular controllers.
 */
angular.module('elasticjs.service', [])
  .factory('ejsResource', ['$http', function ($http) {

    return function (config) {

      var

      // use existing ejs object if it exists
        ejs = window.ejs || {},

      /* results are returned as a promise */
        promiseThen = function (httpPromise, successcb, errorcb) {
          return httpPromise.then(function (response) {
            (successcb || angular.noop)(response.data);
            return response.data;
          }, function (response) {
            (errorcb || angular.noop)(response.data);
            return response.data;
          });
        };

      // check if we have a config object
      // if not, we have the server url so
      // we convert it to a config object
      if (angular.isFunction(config)) {
        config = {server: config()};
      } else if (config !== Object(config)) {
        config = {server: config};
      }

      // set url to empty string if it was not specified
      if (config.server == null) {
        config.server = '';
      }

      /* implement the elastic.js client interface for angular */
      ejs.client = {
        server: function (s) {
          if (s == null) {
            return config.server;
          }

          config.server = s;
          return this;
        },
        post: function (path, data, successcb, errorcb) {
          path = config.server + path;
          var reqConfig = {url: path, data: data, method: 'POST'};
          return promiseThen($http(angular.extend(reqConfig, config)), successcb, errorcb);
        },
        get: function (path, data, successcb, errorcb) {
          path = config.server + path;
          // no body on get request, data will be request params
          var reqConfig = {url: path, params: data, method: 'GET'};
          return promiseThen($http(angular.extend(reqConfig, config)), successcb, errorcb);
        },
        put: function (path, data, successcb, errorcb) {
          path = config.server + path;
          var reqConfig = {url: path, data: data, method: 'PUT'};
          return promiseThen($http(angular.extend(reqConfig, config)), successcb, errorcb);
        },
        del: function (path, data, successcb, errorcb) {
          path = config.server + path;
          var reqConfig = {url: path, data: data, method: 'DELETE'};
          return promiseThen($http(angular.extend(reqConfig, config)), successcb, errorcb);
        },
        head: function (path, data, successcb, errorcb) {
          path = config.server + path;
          // no body on HEAD request, data will be request params
          var reqConfig = {url: path, params: data, method: 'HEAD'};
          return $http(angular.extend(reqConfig, config))
            .then(function (response) {
              (successcb || angular.noop)(response.headers());
              return response.headers();
            }, function (response) {
              (errorcb || angular.noop)(undefined);
              return undefined;
            });
        }
      };

      return ejs;
    };
  }]);
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