package ngo

// Must if error is not empty, will panic
func Must(err error) {
	if err != nil {
		panic(err)
	}
}

// MustV if error is not empty, will panic. otherwise return the value.
func MustV[T any](v T, err error) T {
	if err != nil {
		panic(err)
	}
	return v
}

// ErrOnFail return input error on cond is false, otherwise return nil
func ErrOnFail(cond bool, err error) error {
	return OrError(cond, err)
}

// OrError return input error on cond is false, otherwise return nil
func OrError(cond bool, err error) error {
	if !cond {
		return err
	}
	return nil
}

// FirstOr get first elem or elseVal
func FirstOr[T any](sl []T, elseVal T) T {
	if len(sl) > 0 {
		return sl[0]
	}
	return elseVal
}

// OrValue get
func OrValue[T any](cond bool, okVal, elVal T) T {
	if cond {
		return okVal
	}
	return elVal
}

// OrReturn call okFunc() on condition is true, else call elseFn()
func OrReturn[T any](cond bool, okFn, elseFn func() T) T {
	if cond {
		return okFn()
	}
	return elseFn()
}

// ErrFunc type
type ErrFunc func() error

// CallOn call func on condition is true
func CallOn(cond bool, fn ErrFunc) error {
	if cond {
		return fn()
	}
	return nil
}

// CallOrElse call okFunc() on condition is true, else call elseFn()
func CallOrElse(cond bool, okFn, elseFn ErrFunc) error {
	if cond {
		return okFn()
	}
	return elseFn()
}