feat: add recalculateAllElo function for idempotent ELO recalculation
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@@ -1,3 +1,5 @@
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import type { PrismaClient } from '@prisma/client';
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/**
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* Elo Rating Utilities
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*
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@@ -150,3 +152,232 @@ export function calculateTeamEloChange(
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): number {
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return calculateEloChange(team1Rating, team2Rating, team1Score, kFactor);
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}
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/**
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* Recalculate all player and partnership statistics from match history
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* This function is idempotent - running it multiple times produces the same result
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* @param prisma Prisma client instance
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* @returns Object with counts of affected records
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*/
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export async function recalculateAllElo(prisma: PrismaClient) {
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// Get all matches in chronological order
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const matches = await prisma.match.findMany({
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orderBy: { playedAt: 'asc' },
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include: {
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team1P1: true,
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team1P2: true,
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team2P1: true,
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team2P2: true,
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},
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});
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// Reset all player stats to zero
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await prisma.player.updateMany({
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data: {
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currentElo: 1000,
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gamesPlayed: 0,
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wins: 0,
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losses: 0,
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},
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});
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// Delete all existing elo snapshots
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await prisma.eloSnapshot.deleteMany({});
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// Delete all existing partnership stats (will be rebuilt)
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await prisma.partnershipStat.deleteMany({});
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// Initialize in-memory tracking for all players
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const playerStats = new Map<number, { rating: number; gamesPlayed: number; wins: number; losses: number }>();
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// Initialize partnership tracking
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const partnershipStats = new Map<string, { gamesPlayed: number; wins: number; losses: number; totalEloChange: number; lastPlayed: Date | null }>();
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// Helper to get/create player stats
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const getPlayerStats = (playerId: number) => {
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if (!playerStats.has(playerId)) {
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playerStats.set(playerId, { rating: 1000, gamesPlayed: 0, wins: 0, losses: 0 });
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}
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return playerStats.get(playerId)!;
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};
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// Helper to get partnership key (sorted player IDs)
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const getPartnershipKey = (p1Id: number, p2Id: number) => {
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return [Math.min(p1Id, p2Id), Math.max(p1Id, p2Id)].join('-');
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};
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// Helper to get/update partnership stats
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const getPartnershipStats = (p1Id: number, p2Id: number) => {
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const key = getPartnershipKey(p1Id, p2Id);
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if (!partnershipStats.has(key)) {
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partnershipStats.set(key, { gamesPlayed: 0, wins: 0, losses: 0, totalEloChange: 0, lastPlayed: null });
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}
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return partnershipStats.get(key)!;
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};
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// Process each match in chronological order
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for (const match of matches) {
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const { team1P1, team1P2, team2P1, team2P2, team1Score, team2Score, id: matchId, playedAt } = match;
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// Get current ratings for all players
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const p1Rating = getPlayerStats(team1P1.id).rating;
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const p2Rating = getPlayerStats(team1P2.id).rating;
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const p3Rating = getPlayerStats(team2P1.id).rating;
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const p4Rating = getPlayerStats(team2P2.id).rating;
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// Calculate team ratings
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const team1Rating = calculateTeamElo(p1Rating, p2Rating);
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const team2Rating = calculateTeamElo(p3Rating, p4Rating);
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// Determine match result (team1 score based on points)
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const team1ScoreNormalized = team1Score > team2Score ? 1 : team1Score === team2Score ? 0.5 : 0;
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// Calculate team ELO changes
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const team1Change = calculateTeamEloChange(team1Rating, team2Rating, team1ScoreNormalized);
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const team2Change = -team1Change; // Equal and opposite
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// Split changes evenly between partners
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const p1Change = Math.round(team1Change / 2);
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const p2Change = Math.round(team1Change / 2);
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const p3Change = Math.round(team2Change / 2);
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const p4Change = Math.round(team2Change / 2);
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// Update player stats
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const team1Won = team1Score > team2Score;
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const team2Won = team2Score > team1Score;
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// Update Player 1 (team 1, player 1)
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const stats1 = getPlayerStats(team1P1.id);
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stats1.rating += p1Change;
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stats1.gamesPlayed += 1;
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stats1.wins += team1Won ? 1 : 0;
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stats1.losses += team1Won ? 0 : 1;
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// Update Player 2 (team 1, player 2)
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const stats2 = getPlayerStats(team1P2.id);
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stats2.rating += p2Change;
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stats2.gamesPlayed += 1;
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stats2.wins += team1Won ? 1 : 0;
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stats2.losses += team1Won ? 0 : 1;
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// Update Player 3 (team 2, player 1)
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const stats3 = getPlayerStats(team2P1.id);
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stats3.rating += p3Change;
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stats3.gamesPlayed += 1;
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stats3.wins += team2Won ? 1 : 0;
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stats3.losses += team2Won ? 0 : 1;
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// Update Player 4 (team 2, player 2)
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const stats4 = getPlayerStats(team2P2.id);
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stats4.rating += p4Change;
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stats4.gamesPlayed += 1;
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stats4.wins += team2Won ? 1 : 0;
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stats4.losses += team2Won ? 0 : 1;
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// Update partnership stats for team 1
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const partnership1 = getPartnershipStats(team1P1.id, team1P2.id);
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partnership1.gamesPlayed += 1;
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partnership1.wins += team1Won ? 1 : 0;
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partnership1.losses += team1Won ? 0 : 1;
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partnership1.totalEloChange += p1Change + p2Change;
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if (playedAt && (!partnership1.lastPlayed || playedAt > partnership1.lastPlayed)) {
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partnership1.lastPlayed = playedAt;
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}
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// Update partnership stats for team 2
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const partnership2 = getPartnershipStats(team2P1.id, team2P2.id);
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partnership2.gamesPlayed += 1;
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partnership2.wins += team2Won ? 1 : 0;
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partnership2.losses += team2Won ? 0 : 1;
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partnership2.totalEloChange += p3Change + p4Change;
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if (playedAt && (!partnership2.lastPlayed || playedAt > partnership2.lastPlayed)) {
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partnership2.lastPlayed = playedAt;
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}
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// Create elo snapshots for all players
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const snapshotData = [
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{ playerId: team1P1.id, ratingBefore: p1Rating, ratingChange: p1Change },
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{ playerId: team1P2.id, ratingBefore: p2Rating, ratingChange: p2Change },
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{ playerId: team2P1.id, ratingBefore: p3Rating, ratingChange: p3Change },
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{ playerId: team2P2.id, ratingBefore: p4Rating, ratingChange: p4Change },
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];
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for (const snapshot of snapshotData) {
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await prisma.eloSnapshot.create({
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data: {
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playerId: snapshot.playerId,
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matchId: matchId,
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ratingBefore: snapshot.ratingBefore,
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ratingAfter: snapshot.ratingBefore + snapshot.ratingChange,
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ratingChange: snapshot.ratingChange,
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},
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});
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}
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}
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// Write all updated player stats to database
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const playerUpdatePromises = Array.from(playerStats.entries()).map(
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async ([playerId, stats]) =>
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await prisma.player.update({
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where: { id: playerId },
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data: {
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currentElo: stats.rating,
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gamesPlayed: stats.gamesPlayed,
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wins: stats.wins,
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losses: stats.losses,
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},
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})
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);
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await Promise.all(playerUpdatePromises);
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// Write all partnership stats to database
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const partnershipUpdatePromises = Array.from(partnershipStats.entries()).map(async ([key, stats]) => {
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const [player1Id, player2Id] = key.split('-').map(Number);
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// Check if the partnership stat already exists
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const existingStat = await prisma.partnershipStat.findFirst({
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where: {
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player1Id,
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player2Id,
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},
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});
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if (existingStat) {
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// Update existing record
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return await prisma.partnershipStat.update({
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where: {
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id: existingStat.id,
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},
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data: {
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gamesPlayed: stats.gamesPlayed,
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wins: stats.wins,
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losses: stats.losses,
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totalEloChange: stats.totalEloChange,
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lastPlayed: stats.lastPlayed,
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},
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});
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} else {
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// Create new record
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return await prisma.partnershipStat.create({
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data: {
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player1Id,
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player2Id,
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gamesPlayed: stats.gamesPlayed,
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wins: stats.wins,
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losses: stats.losses,
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totalEloChange: stats.totalEloChange,
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lastPlayed: stats.lastPlayed,
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},
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});
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}
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});
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await Promise.all(partnershipUpdatePromises);
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return {
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matchesProcessed: matches.length,
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playersUpdated: playerStats.size,
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partnershipsUpdated: partnershipStats.size,
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};
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}
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@@ -215,3 +215,17 @@ export async function getManageableTournaments() {
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orderBy: { createdAt: 'desc' }
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});
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}
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/**
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* Check if the user can edit user profiles (only club_admin)
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*/
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export async function canEditUserProfiles(): Promise<PermissionCheck> {
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return hasRole('club_admin');
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}
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/**
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* Check if the user can recalculate ELO ratings (only club_admin)
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*/
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export async function canRecalculateElo(): Promise<PermissionCheck> {
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return hasRole('club_admin');
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}
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