package service

import (
	"fmt"
	"strings"
	"unicode"
)

// shlexSplit splits s into shell-like words, honoring single and double
// quotes. Small hand-rolled equivalent of Python's shlex.split (used by
// macos_service_wrapper.py / service_manager.py to parse the free-form
// service Args string), avoiding an extra third-party dependency.
func shlexSplit(s string) ([]string, error) {
	var words []string
	var current strings.Builder
	inWord := false

	runes := []rune(s)
	i := 0
	for i < len(runes) {
		r := runes[i]
		switch {
		case r == '\'' || r == '"':
			quote := r
			i++
			closed := false
			for i < len(runes) {
				if runes[i] == quote {
					closed = true
					i++
					break
				}
				current.WriteRune(runes[i])
				i++
			}
			if !closed {
				return nil, fmt.Errorf("no closing quotation")
			}
			inWord = true
		case unicode.IsSpace(r):
			if inWord {
				words = append(words, current.String())
				current.Reset()
				inWord = false
			}
			i++
		default:
			current.WriteRune(r)
			inWord = true
			i++
		}
	}
	if inWord {
		words = append(words, current.String())
	}
	return words, nil
}