SettingsController.java

global class SettingsController{
    
    public List<String> getCampaignTypes(){
        List<String> types = new List<String>();
        types.add('All');
        for (Schema.PicklistEntry p : Campaign.Type.getDescribe().getPicklistValues()){
            types.add(p.getValue());
        }
        return types;   
    }

    @RemoteAction
    global static void update_settings(String checkin_status, String register_status, String campaign_type) {
        Map<String, RollCall_Settings__c> settings = RollCall_Settings__c.getAll();
        checkin_status = checkin_status.escapeHtml4();
        register_status = register_status.escapeHtml4();
        campaign_type = campaign_type.escapeHtml4();
        if (settings.isempty()) { 
            if (Schema.sObjectType.RollCall_Settings__c.isCreateable()) {
                RollCall_Settings__c setting = new RollCall_Settings__c();
                setting.Check_in_Status__c = checkin_status;
                setting.Registered_Status__c = register_status;
                setting.Campaign_Type__c = campaign_type;
                setting.name = 'Default Settings';
                insert setting;
            } else {
                throw new CheckInController.ProfilePermissionException('Profile does not have create permission');
            }
        } else {
            if (Schema.sObjectType.RollCall_Settings__c.isUpdateable()) {
                RollCall_Settings__c first_setting = settings.values()[0];  
                first_setting.Check_in_Status__c = checkin_status;
                first_setting.Registered_Status__c = register_status;
                first_setting.Campaign_Type__c = campaign_type;
                update first_setting;
            } else {
                throw new CheckInController.ProfilePermissionException('Profile does not have update permission');
            }
        }       
    }

    @RemoteAction
    global static String[] check_settings() {
        if (Schema.sObjectType.RollCall_Settings__c.isAccessible()) {
            Map<String, RollCall_Settings__c> setting = RollCall_Settings__c.getAll();
            String[] info = new String[3];
            if (setting.isempty()) {
                info[0] = 'Responded';
                info[1] = 'Sent';
                info[2] = 'All';
                return info;
            } else {
                RollCall_Settings__c first_setting = setting.values()[0];   
                info[0] = first_setting.Check_in_Status__c;
                info[1] = first_setting.Registered_Status__c;
                info[2] = first_setting.Campaign_Type__c;
                return info;
            }
        } else {
            throw new CheckInController.ProfilePermissionException('Profile does not have read permission');
        }
    }

}