package prep

// this is a work in progress

// Versioned is the interface that the destination struct should implement to
// make a version string appear at the top of the help message.
type appnameI interface {
	// Version returns the version string that will be printed on a line by itself
	// at the top of the help message.
	Appname() string
}

type autoFuncI interface {
	// Version returns the version string that will be printed on a line by itself
	// at the top of the help message.
	DoAutoComplete(*Auto)
}

type buildtimeI interface {
	Buildtime() (string, string)
}

type examplesI interface {
	// Version returns the version string that will be printed on a line by itself
	// at the top of the help message.
	Examples() string
}

type exitI interface {
	// Version returns the version string that will be printed on a line by itself
	// at the top of the help message.
	Exit()
}

// Described is the interface that the destination struct should implement to
func findAppInfo(tmp interface{}) {
	if tmp, ok := tmp.(appnameI); ok {
		myAuto.appName = tmp.Appname()
	} else {
		panic("you must define in your app the function: (argv) func Appname() string")
	}

	if tmp, ok := tmp.(buildtimeI); ok {
		myAuto.buildtime = tmp.Buildtime
	} else {
		// panic("you need to make the function argv.Appname()")
	}

	if tmp, ok := tmp.(examplesI); ok {
		myAuto.examples = tmp.Examples
	} else {
		// panic("you need to make the function argv.Appname()")
	}

	if tmp, ok := tmp.(autoFuncI); ok {
		myAuto.autoFunc = tmp.DoAutoComplete
	} else {
		// panic("you need to make the function argv.DoAutoComplete()")
	}

	if tmp, ok := tmp.(exitI); ok {
		myAuto.appExit = tmp.Exit
	} else {
		// panic("you need to make the function argv.Exit()")
	}
}