// Copyright 2026 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package utils

import "strings"

// SplitCSV parses val as a comma-separated list, trimming whitespace and
// dropping empty entries (e.g. "alice,,bob" -> ["alice", "bob"]). Returns
// nil (not an empty slice) when no non-empty entries remain, so callers
// can use len(x) == 0 unambiguously and the result round-trips cleanly
// through encoding/json (a nil slice marshals as null and is omitted by
// most Gitea API endpoints that use omitempty).
func SplitCSV(val string) []string {
	if val == "" {
		return nil
	}
	parts := strings.Split(val, ",")
	var out []string
	for _, p := range parts {
		p = strings.TrimSpace(p)
		if p == "" {
			continue
		}
		out = append(out, p)
	}
	return out
}