(function () {
    'use strict';

    var serviceId = 'relationshipsDataContext';
    angular.module('relationships').factory(serviceId, ['$q', '$http', 'relationshipsConfig', datacontext]);


    function datacontext($q, $http, config) {

        var service = {
            getRelationshipTypes: getRelationshipTypes,
            createRelationshipType: createRelationshipType,
            updateRelationshipType: updateRelationshipType,
            deleteRelationshipType: deleteRelationshipType,
            getRelationshipsForUser: getRelationshipsForUser,
            createRelationship: createRelationship,
            updateRelationship: updateRelationship,
            deleteRelationship: deleteRelationship
        };

        return service;

        function getRelationshipTypes() {
            var request = $http({
                method: "get",
                url: config.apigatewayUrl + 'relationships/RelationshipType' + '?cache=' + Date.now(),
            });

            return (request.then(handleSuccess, handleError));
        }

        function createRelationshipType(type) {
            var request = $http({
                method: "post",
                url: config.apigatewayUrl + 'relationships/RelationshipType' + '?cache=' + Date.now(),
                data: type
            });

            return (request.then(handleSuccess, handleError));
        }
  
        function updateRelationshipType(type) {
            var request = $http({
                method: "put",
                url: config.apigatewayUrl + 'relationships/RelationshipType' + '?cache=' + Date.now(),
                data: type
            });

            return (request.then(handleSuccess, handleError));
        }

        function deleteRelationshipType(type) {
            var request = $http({
                method: "delete",
                url: config.apigatewayUrl + 'relationships/RelationshipType/id/' + type.id + '?cache=' + Date.now(),
            });

            return (request.then(handleSuccess, handleError));
        }

        function getRelationshipsForUser(userId) {
            var request = $http({
                method: "get",
                url: config.apigatewayUrl + 'relationships/Relationship/user/' + userId + '?cache=' + Date.now(),
            });

            return (request.then(handleSuccess, handleError));
        }

        function createRelationship(model) {
            var request = $http({
                method: "post",
                url: config.apigatewayUrl + 'relationships/Relationship' + '?cache=' + Date.now(),
                data: model
            });

            return (request.then(handleSuccess, handleError));
        }

        function updateRelationship(model) {
            var request = $http({
                method: "put",
                url: config.apigatewayUrl + 'relationships/Relationship' + '?cache=' + Date.now(),
                data: model
            });

            return (request.then(handleSuccess, handleError));
        }

        function deleteRelationship(model) {
            var request = $http({
                method: "delete",
                url: config.apigatewayUrl + 'relationships/Relationship/id/' + model.id + '?cache=' + Date.now(),
            });

            return (request.then(handleSuccess, handleError));
        }

        function handleError(response) {

            // The API response from the server should be returned in a
            // nomralized format. However, if the request was not handled by the
            // server (or what not handles properly - ex. server error), then we
            // may have to normalize it on our end, as best we can.
            if (
                !angular.isObject(response.data) ||
                !response.data.message
            ) {

                return ($q.reject("An unknown error occurred."));
            }

            // Otherwise, use expected error message.
            return ($q.reject(response.data.message));
        }

        // I transform the successful response, unwrapping the application data
        // from the API response payload.
        function handleSuccess(response) {
            if (response)
                return (response.data);
            else
                return null;
        }
    }
})();