import DS from 'ember-data';

export default DS.RESTSerializer.extend({
  normalizeFindAllResponse: function(store, primaryModelClass, payload, id, requestType) {
    var json = { data: [] };

    this._normalizePayload(payload, function(entity) {
      json.data.push(entity);
      return true;
    });

    return json;
  },

  normalizeFindRecordResponse: function(store, primaryModelClass, payload, id, requestType) {
    var json = { data: {} };

    this._normalizePayload(payload, function(entity) {
      json.data = entity;
      return false;
    });

    return json;
  },

  _normalizePayload: function(payload, handleEntity) {
    // check if payload has context responses
    if (payload.contextResponses) {
      payload.contextResponses.forEach(function(item) {
        // check if item has context element
        if (item.contextElement) {
          // create new entity object
          var entity = {
            type: 'entity',
            id: item.contextElement.id,
            attributes: {
              type: item.contextElement.type,
              properties: []
            }
          }

          if (item.contextElement.attributes) {
            item.contextElement.attributes.forEach(function(attribute) {
              var property = {
                name: attribute.name,
                value: attribute.value,
                type: attribute.type,
                timestamp: attribute.metadatas[0].value
              }

              entity.attributes.properties.push(property);
            });
          }

          // pass entity to caller function
          if (handleEntity(entity) == false) {
            // if false returned the caller needs no more entites
            return;
          }
        }
      });
    }
  }
});