package utils

import (
	"strings"
	"unicode"
)

func Camelize(s string) string {
	// If input has no delimiters, assume it's already in camelCase or PascalCase
	if !strings.ContainsAny(s, "_- ") {
		return s[:1] + s[1:] // No change (optionally lowercase first letter: strings.ToLower(s[:1]) + s[1:])
	}

	// Otherwise, split and camelCase it
	parts := strings.FieldsFunc(s, func(r rune) bool {
		return r == '_' || r == '-' || unicode.IsSpace(r)
	})

	if len(parts) == 0 {
		return ""
	}

	var b strings.Builder
	b.WriteString(strings.ToLower(parts[0]))

	for _, part := range parts[1:] {
		if len(part) == 0 {
			continue
		}
		b.WriteString(strings.ToUpper(part[:1]))
		if len(part) > 1 {
			b.WriteString(part[1:])
		}
	}

	return b.String()
}