import Ember from 'ember';

import store from 'store';

import ENV from 'bo-client/config/environment';

// TODO: implement store layer with auto-expiration : c.f. https://github.com/marcuswestin/store.js/#no-sessionstorageauto-expiration

export default Ember.Service.extend({

  constants: Ember.inject.service(),

  _getStoreKey: function(id) {

    return 'viaf:'+id;

  },

  getName: function(id) {

    var viafId = id;

    if(id.startsWith(this.get('constants').VIAF_BASE_URL)) {

      viafId = id.slice(this.get('constants').VIAF_BASE_URL.length);

    }

    var storeKey = this._getStoreKey(id);

    var namePromise = null;

    var name = store.get(storeKey);

    if(!name) {

      //TODO: handle error !!!

      namePromise = this.queryName(viafId)

        .then( function(response) {

            return store.set(storeKey, response);

        });

    }

    else {

      namePromise = new Ember.RSVP.Promise(function(resolve/*, reject*/) {

        resolve(name);

      });

    }

    return namePromise;

  },

  // make the query for the name.

  // return a Promise

  queryName: function(id) {

    return new Ember.RSVP.Promise(function(resolve, reject) {

      Ember.$.ajax({

        //TODO Configuration ?

        url:  ENV.baseURL.replace(/\/$/,"") + "/api/v1/viaf/"+id,

        success: function(viafDoc) {

          var names = viafDoc.viafids;

          resolve((id in names)?names[id]:null);

        },

        error: function(req, status, error) {

          reject(status + ":" + error);

        }

      });

    }.bind(this));

  }

});