package util

// ChunkStrings splits input into consecutive slices of at most size elements.
// The last slice holds whatever is left over and may be shorter than the
// others. Each returned slice is a copy, so appending to one of them cannot
// disturb another. A size below one, or an empty input, returns nil.
func ChunkStrings(input []string, size int) [][]string {
	if size < 1 || len(input) == 0 {
		return nil
	}

	out := make([][]string, 0, (len(input)+size-1)/size)

	for start := 0; start < len(input); start += size {
		end := start + size
		if end > len(input) {
			end = len(input)
		}

		chunk := make([]string, end-start)
		copy(chunk, input[start:end])
		out = append(out, chunk)
	}

	return out
}