import random
import json

# Function to simulate a match with potential tiebreaks
def simulate_match(player1, player2):
    result = random.choice(['2-0', '2-1', '2-1_tb'])
    winner = player1 if random.choice([True, False]) else player2
    if result == '2-0':
        loser = player2 if winner == player1 else player1
        return (winner, 3, loser, 0, 2, 0, 0)
    elif result == '2-1':
        loser = player2 if winner == player1 else player1
        return (winner, 2, loser, 1, 2, 1, 0)
    else:  # '2-1_tb'
        loser = player2 if winner == player1 else player1
        return (winner, 3, loser, 1, 2, 1, 1)

# Initialize players and standings
groups = {
    'A': ['A1', 'A2', 'A3', 'A4'],
    'B': ['B1', 'B2', 'B3', 'B4']
}

standings = {
    'A': {player: {'points': 0, 'sets_won': 0, 'sets_lost': 0, 'tiebreaks_won': 0} for player in groups['A']},
    'B': {player: {'points': 0, 'sets_won': 0, 'sets_lost': 0, 'tiebreaks_won': 0} for player in groups['B']}
}

# Define matches for each group
matches = {
    'A': [
        ('A3', 'A4'), ('A1', 'A2'),
        ('A2', 'A4'), ('A1', 'A3'),
        ('A2', 'A3'), ('A1', 'A4')
    ],
    'B': [
        ('B2', 'B3'), ('B1', 'B4'),
        ('B1', 'B3'), ('B2', 'B4'),
        ('B3', 'B4'), ('B1', 'B2')
    ]
}

# Simulate all matches and update standings
for group in matches:
    for match in matches[group]:
        winner, winner_points, loser, loser_points, sets_won, sets_lost, tiebreaks_won = simulate_match(*match)
        standings[group][winner]['points'] += winner_points
        standings[group][loser]['points'] += loser_points
        standings[group][winner]['sets_won'] += sets_won
        standings[group][winner]['sets_lost'] += sets_lost
        standings[group][loser]['sets_won'] += sets_lost
        standings[group][loser]['sets_lost'] += sets_won
        standings[group][winner]['tiebreaks_won'] += tiebreaks_won

print(json.dumps(standings, indent=2))