package helper

import "strings"

func LowerFirst(s string) string {
	isFirst := true
	return strings.Map(func(r rune) rune {
		if isFirst && r >= 'A' && r <= 'Z' {
			return r + 32
		}
		isFirst = false
		return r
	}, s)
}

func BreakUp(s string) []string {
	length := len(s)
	b := make([]byte, length)
	ss := make([]string, 0)
	var p int
	for i := 0; i < length; i++ {
		if s[i] >= 'A' && s[i] <= 'Z' {
			if p > 0 {
				ss = append(ss, string(b[:p]))
			}
			p = 0
			b[p] = s[i] + 32
		} else {
			b[p] = s[i]
		}
		p++
	}
	if p > 0 {
		ss = append(ss, string(b[:p]))
	}
	return ss
}

func Camel2id(s string) string {
	return strings.Join(BreakUp(s), "-")
}