Ping Pong Ranking App - Leaderboard

leaderboard.ts

type PlayerRecord = {
  playerID: string;
  losses: number;
  wins: number;
};

type PlayerRecords = {
  [key: string]: PlayerRecord;
};

type Match = {
  matchID: string;
  winnerID: string;
  loserID: string;
};

type Matches = {
  [key: string]: Match;
};

export async function handler() {
  const allMatches: Matches = await Zipper.storage.getAll();
  const matchesArray: Match[] = Object.values(allMatches);

  const players: PlayerRecords = {};

  matchesArray.forEach((match: Match) => {
    const { loserID, winnerID } = match;

    if (players[loserID]) {
      players[loserID].losses++;
    } else {
      players[loserID] = {
        playerID: loserID,
        losses: 0,
        wins: 0,
      };
    }

    if (players[winnerID]) {
      players[winnerID].wins++;
    } else {
      players[winnerID] = {
        playerID: winnerID,
        losses: 0,
        wins: 0,
      };
    }
  });

  return Object.values(players);
}

export const config: Zipper.HandlerConfig = {
  run: true,
  description: {
    title: "Leaderboard",
    subtitle: "See player rankings for all recorded matches",
  },
};