/* ----------------------------------------------------------------------------
 * Easy!Appointments - Open Source Web Scheduler
 *
 * @package     EasyAppointments
 * @author      A.Tselegidis <alextselegidis@gmail.com>
 * @copyright   Copyright (c) 2013 - 2017, Alex Tselegidis
 * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
 * @link        http://easyappointments.org
 * @since       v1.0.0
 * ---------------------------------------------------------------------------- */

$(document).ready(function() {
    /**
     * Event: Add Appointment to Google Calendar "Click"
     *
     * This event handler adds the appointment to the users Google Calendar Account. The event is going to
     * be added to the "primary" calendar. In order to use the API the javascript client library provided by
     * Google is necessary.
     */
    $('#add-to-google-calendar').click(function() {
        gapi.client.setApiKey(GlobalVariables.googleApiKey);
        gapi.auth.authorize({
            client_id: GlobalVariables.googleClientId,
            scope: GlobalVariables.googleApiScope,
            immediate: false
        }, handleAuthResult);
    });

    /**
     * Handle Authorization Result
     *
     * This method handles the authorization result. If the user granted access to his data, then the
     * appointment is going to be added to his calendar.
     *
     * @param {Boolean} authResult The user's authorization result.
     */
    function handleAuthResult(authResult) {
        try {
            if (authResult.error) {
                throw 'Could not authorize user.';
            }

            // The user has granted access, add the appointment to his calendar.
            // Before making the event.insert request the the event resource data
            // must be prepared.
            var appointmentData = GlobalVariables.appointmentData;

            appointmentData['start_datetime'] = GeneralFunctions.ISODateString(
                    Date.parseExact(appointmentData['start_datetime'],
                    'yyyy-MM-dd HH:mm:ss'));
            appointmentData['end_datetime'] = GeneralFunctions.ISODateString(
                    Date.parseExact(appointmentData['end_datetime'],
                    'yyyy-MM-dd HH:mm:ss'));

            // Create a valid Google Calendar API resource for the new event.
            var resource = {
                summary: GlobalVariables.serviceData['name'],
                location: GlobalVariables.companyName,
                start: {
                    dateTime: appointmentData['start_datetime']
                },
                end: {
                    dateTime: appointmentData['end_datetime']
                },
                attendees: [
                    {
                        email: GlobalVariables.providerData['email'],
                        displayName: GlobalVariables.providerData['first_name'] + ' '
                                + GlobalVariables.providerData['last_name']
                    }
                ]
            };

            gapi.client.load('calendar', 'v3', function() {
                var request = gapi.client.calendar.events.insert({
                    calendarId: 'primary',
                    resource: resource
                });

                request.execute(function(response) {
                    if (response.error) {
                        throw 'Could not add the event to Google Calendar.';
                    }

                    $('#success-frame').append(
                        '<br><br>' +
                        '<div class="alert alert-success col-xs-12">' +
                            '<h4>' + EALang['success'] + '</h4>' +
                            '<p>' +
                                EALang['appointment_added_to_google_calendar'] +
                                '<br>' +
                                '<a href="' + response.htmlLink + '" target="_blank">' +
                                    EALang['view_appointment_in_google_calendar'] +
                                '</a>' +
                            '</p>' +
                        '</div>'
                    );
                    $('#add-to-google-calendar').hide();
                });
            });
        } catch(exc) {
            // The user denied access or something else happened, display corresponding message on the screen.
            $('#success-frame').append(
                '<div class="alert alert-danger col-xs-12">' +
                    '<h4>' + EALang['oops_something_went_wrong'] + '</h4>' +
                    '<p>' +
                        EALang['could_not_add_to_google_calendar'] +
                        '<pre>' + exc + '</pre>' +
                    '</p>' +
                '</div>');
        }
    }
});