#!/usr/bin/env python3
"""
Parse deck list text files or pasted deck lists.
Usage:
    python parse_deck.py <deck_file.txt>
    python parse_deck.py --stdin < decklist.txt
"""

import argparse
import json
import re
import sys


def parse_deck_text(text: str) -> dict[str, int]:
    """Parse deck list text into {card_name: count} dict."""
    cards = {}
    for line in text.strip().split('\n'):
        line = line.strip()
        if not line or line.startswith('#'):
            continue
        match = re.match(r'^(\d+)x?\s+(.+)$', line, re.IGNORECASE)
        if match:
            count = int(match.group(1))
            name = match.group(2).strip()
            cards[name] = count
    return cards


def main():
    parser = argparse.ArgumentParser(description='Parse deck list into JSON')
    parser.add_argument('input', nargs='?', help='Deck list file')
    parser.add_argument('--stdin', action='store_true', help='Read from stdin')
    parser.add_argument('-o', '--output', help='Output JSON file')
    args = parser.parse_args()

    if args.stdin:
        text = sys.stdin.read()
    elif args.input:
        with open(args.input, 'r') as f:
            text = f.read()
    else:
        parser.print_help()
        sys.exit(1)

    cards = parse_deck_text(text)
    result = {
        'total_cards': sum(cards.values()),
        'unique_cards': len(cards),
        'cards': cards
    }

    output = json.dumps(result, indent=2)
    if args.output:
        with open(args.output, 'w') as f:
            f.write(output)
    else:
        print(output)


if __name__ == '__main__':
    main()