(function(){
"use strict";
angular.module('shared')
    .run( [ '$timeout', 'SessionTimeoutModal', 'SessionApi', 'windowService', '$rootScope', '$compile',
        function($timeout, SessionTimeoutModal, SessionApi, windowService, $rootScope, $compile){

            var REQUEST_TIME_DRIFT_SECONDS = 60;

            if(!windowService.isIframe()){
                openModalOnExpiry();
            }

            function openModalOnExpiry(){
                return SessionApi.getDetails()
                    .then(function(sessionDetails){
                        if(!sessionDetails.hasTimeout){
                            return;
                        }
                        var secondsUntilModal = calculateSecondsUntilModal(sessionDetails.expiresInSeconds || 0);
                        if(secondsUntilModal <= 0){
                            return SessionTimeoutModal
                                .show()
                                .then(handleModalResults)
                        }
                        return $timeout(openModalOnExpiry, secondsUntilModal * 1000);
                    });
            }

            function calculateSecondsUntilModal(expiresInSeconds){
                return expiresInSeconds - REQUEST_TIME_DRIFT_SECONDS - SessionTimeoutModal.getModalTimeoutSeconds();
            }

            function handleModalResults(status){
                switch(status){
                    case 'accept':
                        return SessionApi.keepAlive()
                            .then(function(){
                                return openModalOnExpiry()
                            });
                    case 'reject':
                        showLoadingAnimation();
                        return SessionApi.logout();
                    case 'timeout':
                        showLoadingAnimation();
                        return SessionApi.timeout();
                    default:
                        throw new Error('unknown session timeout status');
                }
            }

            function showLoadingAnimation(){
                var lnkFn = $compile(
                    '<div class="body-overlay"><loading is-loading="true"></loading></div>'
                );
                var loading = lnkFn($rootScope.$new());
                angular.element('body').append(loading);
            }
    }]);

})();