'use strict';

var app = angular.module( 'app', [] );

// register the interceptor during module config
app.config( function( $httpProvider ) {
  $httpProvider.responseInterceptors.push( interceptor );
} );

// initiate data load on module start up
app.run( function( $http, $rootScope ) {
  $http.get( 'data.json', { cls: District, initFn: createSchools } )
    .success( function( data, status, headers, config ) {

      var district = data[ 0 ];
      $rootScope.msg1 = "var district = data[ 0 ];";

      var listContainsDistricts = new String( district instanceof District );
      $rootScope.msg2 = "district instanceof District = " + listContainsDistricts;

      var districtHasSchools = new String( district.schools[ 0 ] instanceof School );
      $rootScope.msg3 = "district.schools[ 0 ] instanceof School = " + districtHasSchools;

    } );
} );

var interceptor = function( $q ) {
  return function( promise ) {

    // convert the returned data using values passed to $http.get()'s config param
    var resolve = function( value ) {
      convertList( value.data, value.config.cls, value.config.initFn );
    };

    var reject = function( reason ) {
      console.log( "rejected because: ", reason );
    };

    // attach our actions
    promise.then( resolve, reject );

    // return the original promise
    return promise;
  }
};

// using angular's forEach method, pass each item in a list to convertInstance
var convertList = function( list, type, initFn ) {
  list = angular.forEach( list, function( o, index ) {
    this[ index ] = convertInstance( o, type, initFn );
  }, list );
};

// using angular's extend method, replace each object with a typed instance
// optionally call an initialization function for each new instance
var convertInstance = function( instance, type, initFn ) {
  instance = angular.extend( new type(), instance );
  if( initFn )
    initFn.call( instance );
  return instance;
};

// convert each District's list of Schools
var createSchools = function() {
  convertList( this.schools, School );
};

// dummy types. these would normally be real "classes".
var District = function() {};
var School = function() {};