Browser Mobile Detection, if no app > Download App

I need to be able to detect if they are using Desktop or Mobile. *NO browser sniffing* Here's the basic Idea: If Desktop Go to DesktopURL If Mobile, is it Android, IOS, or Windows? If Android > Go to AndroidApp > If no Android App Installed > Download Android App and Go to AndroidAppURL If IOS 9 or higher > Go to IOSApp > If no IOS App Installed > Download IOS App and Go to IOSAppURL If Windows Mobile > Go to WindowsMobileApp > If no WindowsMobileApp Installed > Download Windows Mobile App and Go to WindowsMobileAppURL Else Go to DesktopURL