Tennis Game and Set Scoring

Build a scorekeeper for one tennis set between player A and player B. Process the strings in operations in order and return an array with one result string for each operation.

Scoring rules

• A set is played as a series of games. Each point is won by exactly one player.
• A player wins the current game as soon as they have at least 4 points and lead by at least 2 points. The next game then starts at 0 points for both players.
• A player wins the set as soon as they have won at least 6 games and lead by at least 2 games. There is no tiebreak: at 6-6, play continues until one player leads by 2 games.

Operations

• "POINT_A" or "POINT_B": that player wins a point. The result is "OK". If the set already has a winner, the point is not recorded and the result is "ERROR".
• "GAME_SCORE": the score of the current game in the format below. If the set already has a winner, there is no current game and the result is "ERROR".
• "SET_SCORE": the number of games each player has won, written as "gamesA-gamesB", for example "6-4".
• "WINNER": "A" or "B" if that player has won the set, otherwise "NONE".

Game score format

• If both players have at least 3 points and the same number of points, the score is "deuce".
• If both players have at least 3 points and one player leads by exactly 1 point, the score is "adv-A" or "adv-B" for the leading player.
• Otherwise, call each player's points as 0 points = "0", 1 = "15", 2 = "30", and 3 = "40". The score is player A's call, a hyphen, then player B's call, for example "30-15" or "0-40".