// Package strx provides string helpers on top of gstr, including naming
// conversion and sensitive-data masking.
package strx

import (
	"strings"

	"github.com/gogf/gf/v2/text/gstr"
)

// SnakeCase converts s to snake_case, e.g. "UserName" -> "user_name".
func SnakeCase(s string) string {
	return gstr.CaseSnake(s)
}

// CamelCase converts s to CamelCase, e.g. "user_name" -> "UserName".
func CamelCase(s string) string {
	return gstr.CaseCamel(s)
}

// LowerCamelCase converts s to lowerCamelCase, e.g. "user_name" -> "userName".
func LowerCamelCase(s string) string {
	return gstr.CaseCamelLower(s)
}

// IsEmpty reports whether s is empty or whitespace-only.
func IsEmpty(s string) bool {
	return strings.TrimSpace(s) == ""
}

// MaskPhone masks a phone number, keeping the first 3 and last 4 characters.
// e.g. "13812345678" -> "138****5678".
func MaskPhone(s string) string {
	if len(s) < 7 {
		return s
	}
	return s[:3] + "****" + s[len(s)-4:]
}

// MaskIDCard masks a Chinese ID card number, keeping the first 6 and last 4
// characters. e.g. "110101199003074512" -> "110101********4512".
func MaskIDCard(s string) string {
	if len(s) < 10 {
		return s
	}
	return s[:6] + "********" + s[len(s)-4:]
}

// MaskName masks a Chinese name, keeping only the first character.
// e.g. "张三丰" -> "张**".
func MaskName(s string) string {
	r := []rune(s)
	if len(r) <= 1 {
		return s
	}
	return string(r[0]) + strings.Repeat("*", len(r)-1)
}