package connection

func Reverse[T any](slice []T) []T {
	var reversed []T
	for i := len(slice) - 1; i >= 0; i-- {
		reversed = append(reversed, slice[i])
	}

	return reversed
}

func First[T any](slice []T, first *int) []T {
	if len(slice) == 0 || first == nil {
		return slice[:]
	}

	if *first > len(slice) {
		*first = len(slice)
	}

	return slice[:*first]
}

func Last[T any](slice []T, last *int) []T {
	if len(slice) < 1 {
		return nil
	}

	if last == nil {
		return slice[:]
	}

	if *last < 0 {
		*last = 0
	}

	var i int
	if *last >= len(slice) {
		i = 0
	} else if *last == 0 {
		return nil
	} else {
		i = len(slice) - *last
	}

	return slice[i:]
}