package gamepad


var Driver ControllerDriver = nil 

func Install(out chan<-Event) {
    Driver = InstallDriver(out)
}


func Uninstall() {
   if (Driver != nil) {
        Driver.Exit()
        Driver = nil
    }
}


func IsInstalled() bool {
    return Driver != nil
}

func Recofigure() bool {
    if Driver == nil {
        return false
    }
    return Driver.Reconfigure()

}


func Source() Driver {
    return Driver
}

func emitEvent(event Event) {
    Driver.Emit(event)
}


func NumberOfControllers() int {
    if Driver == nil {
        return 0
    }
    return Driver.NumberOfControllers()
}

type Controller interface {
    Release() error
    Active() bool
    Name() string
    NumberOfAxes() int
    NumberOfButtons() int
    Flags() int
} 

func ControllerById(id int) Controller {
    if Driver == nil {
        return nil
    }
    if id < 0 || id >= NumberOfControllers() {
        return nil
    } 
    return Driver.ControllerById()    
}