package helpers

import (
	"fmt"
	"math/rand/v2"
	"strings"

	"github.com/google/uuid"
)

func GenerateID() string {
	return uuid.New().String()
}

func GenerateOTP() string {
	num := 100000 + rand.UintN(899999)
	return fmt.Sprintf("%d", num) // 6 digit random number [100,000 - 999,999]
}

func GenerateFastCode() string {
	const letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	var code string
	for i := 0; i < 6; i++ {
		code += string(letters[rand.UintN(uint(len(letters)))])
	}
	return code
}

func MaskPhone(phone string) string {
	if phone == "" {
		return ""
	}
	return phone[:4] + "**" + phone[len(phone)-2:]
}

func MaskEmail(email string) string {
	if email == "" {
		return ""
	}
	return email[:3] + "**" + email[strings.Index(email, "@"):]
}