import (
	"strings"
	"unicode"
)

/**
     * @Author QY
     * @Email 80013593@qq.com
     * @Description //字符串首字母小写
     * @Date 11:28 2023/2/5
     * @Param
     * @return
**/
func FirstLower(s string) string {
	if s == "" {
		return ""
	}
	return strings.ToLower(s[:1]) + s[1:]
}

/**
     * @Author QY
     * @Email 80013593@qq.com
     * @Description //字符串首字母大写
     * @Date 11:28 2023/2/5
     * @Param
     * @return
**/
func FirstUpper(s string) string {
	if s == "" {
		return ""
	}
	return strings.ToUpper(s[:1]) + s[1:]
}

// 下划线单词转为大写驼峰单词
func UderscoreToUpperCamelCase(s string) string {
	tablenamelist := strings.Split(s, "_")
	title := ""
	for i := 0; i < len(tablenamelist); i++ {
		strStart := string([]byte(tablenamelist[i])[:1])
		strend := string([]byte(tablenamelist[i])[1:])
		// 大驼峰表名 结构体使用
		title += strings.ToUpper(strStart) + strend

	}
	return title
}

// 下划线单词转为小写驼峰单词
func UderscoreToLowerCamelCase(s string) string {
	tablenamelist := strings.Split(s, "_")
	title := ""
	for i := 0; i < len(tablenamelist); i++ {
		strStart := string([]byte(tablenamelist[i])[:1])
		strend := string([]byte(tablenamelist[i])[1:])

		// 小驼峰表名 js函数名和权限标识使用
		if i == 0 {
			title += strings.ToLower(strStart) + strend
		} else {
			title += strings.ToUpper(strStart) + strend
		}
	}
	return title
}

// 驼峰单词转下划线单词
func CamelCaseToUdnderscore(s string) string {
	var output []rune
	for i, r := range s {
		if i == 0 {
			output = append(output, unicode.ToLower(r))
		} else {
			if unicode.IsUpper(r) {
				output = append(output, '_')
			}

			output = append(output, unicode.ToLower(r))
		}
	}
	return string(output)
}