#!/usr/bin/env python3

import sys
import random

# ---------------------------------------------------------------------------
# Basic random number generator for lotteries, keno and more
#
# Blue Oak Model License 1.0.0 (https://blueoakcouncil.org/license/1.0.0)
# (c) 2026 https://640kb.neocities.org
#
# 26jun2026: initial release
# ---------------------------------------------------------------------------

def print_help():
    print("""
 Basic Lottery Number Generator

 Usage:
   lotto <lowNumber> <highNumber> <numbersToGenerate>

 Description:
   Generates unique random numbers within a given range.

 Examples:
   Mega:       lotto 1 70 5   ( 5 numbers between 1 and 70)
   Mega Ball:  lotto 1 24 1   ( 1 number  between 1 and 24)

   Powerball:  lotto 1 69 5   ( 5 numbers between 1 and 69)
   Bonus ball: lotto 1 26 1   ( 1 number  between 1 and 26)

   Keno (P10): lotto 1 80 10  (10 numbers between 1 and 80)

 Options:
   -h, --help  Show this help message

 Tip: To generate multiple sets in one go (as a bash one-liner)

     for i in {1..5}; do ./lotto 1 70 5; done
     for i in {1..5}; do ./lotto 1 24 1; done

 To remove extra blank lines when looping:
     for i in {1..5}; do ./lotto 1 70 5 | grep -v '^$'; done
""")

def main():
    if len(sys.argv) == 2 and sys.argv[1] in ("-h", "--help"):
        print_help()
        return

    if len(sys.argv) != 4:
        print_help()
        return

    try:
        low = int(sys.argv[1])
        high = int(sys.argv[2])
        count = int(sys.argv[3])

        if low >= high:
            raise ValueError("lowNumber must be less than highNumber")

        if count > (high - low + 1):
            raise ValueError("numbersGenerated is larger than the available range")

    except ValueError:
        print_help()
        return

    numbers = sorted(random.sample(range(low, high + 1), count))

    print()
    print(" ".join(map(str, numbers)))
    print()

if __name__ == "__main__":
    main()