package utils

import (
	"fmt"
	"math/rand"
	"strconv"
	"strings"
	"time"
)

func FormatCurrency(value float64) string {
	currencyStr := strconv.FormatFloat(value, 'f', 2, 64)
	split := strings.Split(currencyStr, ".")
	n := len(split[0])
	if n <= 3 {
		return fmt.Sprintf("Rp %s,%s", split[0], split[1])
	}
	var result []string
	for i := 0; i < n; i += 3 {
		end := n - i
		start := end - 3
		if start < 0 {
			start = 0
		}
		result = append([]string{split[0][start:end]}, result...)
	}
	currencyStr = strings.Join(result, ".")
	return fmt.Sprintf("Rp %s,%s", currencyStr, split[1])
}

const charset = "abcdefghijklmnopqrstuvwxyz" +
	"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

var seededRand *rand.Rand = rand.New(
	rand.NewSource(time.Now().UnixNano()))

func GenerateRandomString(length int) string {
	b := make([]byte, length)
	for i := range b {
		b[i] = charset[seededRand.Intn(len(charset))]
	}
	return string(b)
}