package utils

import (
	"crypto/rand"
	"math/big"
	"time"
)

// Generates a random integer in the range (min, max)
func RandInt(min, max int) int {
	n, _ := rand.Int(rand.Reader, big.NewInt(int64(max-min)))
	return int(n.Int64()) + min
}

// Get the current time in milliseconds
func GetCurrentTimeMillis() int64 {
	return time.Now().UnixNano() / int64(time.Millisecond) // Convert nanoseconds to milliseconds
}

// IsAlpha checks if the string contains only alphabetic characters
func IsAlpha(s string) bool {
    for _, r := range s {
        if !('a' <= r && r <= 'z') && !('A' <= r && r <= 'Z') {
            return false
        }
    }
    return true
}

// IsDigit checks if the string contains only digits
func IsDigit(s string) bool {
    for _, r := range s {
        if !(r >= '0' && r <= '9') {
            return false
        }
    }
    return true
}

// IsHex checks if the string is a valid hexadecimal representation
func IsHex(s string) bool {
    for _, r := range s {
        if !((r >= '0' && r <= '9') || (r >= 'a' && r <= 'f') || (r >= 'A' && r <= 'F')) {
            return false
        }
    }
    return true
}