#!/usr/bin/env fun

/*
 * This file is part of the Fun programming language.
 * https://fun-lang.xyz/
 *
 * Copyright 2025 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the Apache-2.0 license.
 * https://opensource.org/license/apache-2-0
 *
 * Added: 2025-12-12
 */

/*
 * Example: Using OS-based random_number(len) builtin
 * This generates cryptographically strong random bytes and returns them
 * hex-encoded as a string of length 2*len (since each byte -> two hex chars).
 */

print("--- random_number(len) demo ---")

len_bytes = 16
hexstr = random_number(len_bytes)
print("Requested bytes: " + to_string(len_bytes))
print("Hex string: " + hexstr)
print("Hex length (should be 2*bytes = 32): " + to_string(len(hexstr)))

// Zero length returns empty string
empty = random_number(0)
print("Empty (0 bytes) -> length: " + to_string(len(empty)) + " value: " + to_string(empty))

// You can request longer values as needed, e.g., 32 bytes -> 64 hex chars
hex64 = random_number(32)
print("32 bytes -> " + to_string(len(hex64)) + " hex chars")

/* Possible output:
--- random_number(len) demo ---
Requested bytes: 16
Hex string: d5f12eb93b71e78cc803aa802e76e3b4
Hex length (should be 2*bytes = 32): 32
Empty (0 bytes) -> length: 0 value: 
32 bytes -> 64 hex chars
*/