2026-03-30 02:30:16 +00:00
3 changed files with 425 additions and 0 deletions
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+/**
+ * Elo Rating Utilities
+ * 
+ * Provides functions for calculating Elo ratings and changes
+ * Based on the standard Elo rating system
+ */
+
+/**
+ * Calculate the expected score for a player based on rating difference
+ * @param ratingA Player A's rating
+ * @param ratingB Player B's rating
+ * @returns Expected score (0-1) for Player A
+ */
+export function calculateExpectedScore(ratingA: number, ratingB: number): number {
+  const ratingDiff = ratingA - ratingB;
+  return 1 / (1 + Math.pow(10, -ratingDiff / 400));
+}
+
+/**
+ * Calculate Elo rating change for a single game
+ * @param rating Player's current rating
+ * @param opponentRating Opponent's rating
+ * @param actualScore Actual score (1 = win, 0.5 = draw, 0 = loss)
+ * @param kFactor K-factor (how much ratings change per game)
+ * @returns Elo rating change (positive or negative)
+ */
+export function calculateEloChange(
+  rating: number,
+  opponentRating: number,
+  actualScore: number,
+  kFactor: number = 32
+): number {
+  const expectedScore = calculateExpectedScore(rating, opponentRating);
+  return kFactor * (actualScore - expectedScore);
+}
+
+/**
+ * Calculate team Elo rating as average of individual ratings
+ * @param rating1 Rating of player 1
+ * @param rating2 Rating of player 2
+ * @returns Team rating
+ */
+export function calculateTeamElo(rating1: number, rating2: number): number {
+  return (rating1 + rating2) / 2;
+}
+
+/**
+ * Update player statistics after a match
+ * @param currentRating Current player rating
+ * @param currentGamesPlayed Current games played count
+ * @param currentWins Current wins count
+ * @param eloChange Elo rating change
+ * @param won Whether the player won
+ * @returns Updated statistics
+ */
+export function updatePlayerStats(
+  currentRating: number,
+  currentGamesPlayed: number,
+  currentWins: number,
+  eloChange: number,
+  won: boolean
+): {
+  newRating: number;
+  newGamesPlayed: number;
+  newWins: number;
+  newLosses: number;
+  winRate: number;
+} {
+  const newRating = currentRating + Math.round(eloChange);
+  const newGamesPlayed = currentGamesPlayed + 1;
+  const newWins = currentWins + (won ? 1 : 0);
+  const newLosses = newGamesPlayed - newWins;
+  const winRate = newGamesPlayed > 0 ? newWins / newGamesPlayed : 0;
+
+  return {
+    newRating,
+    newGamesPlayed,
+    newWins,
+    newLosses,
+    winRate,
+  };
+}
+
+/**
+ * Calculate new rating after a match
+ * @param currentRating Current rating
+ * @param opponentRating Opponent's rating
+ * @param won Whether the player won
+ * @param kFactor K-factor (default 32)
+ * @returns New rating
+ */
+export function calculateNewRating(
+  currentRating: number,
+  opponentRating: number,
+  won: boolean,
+  kFactor: number = 32
+): number {
+  const actualScore = won ? 1 : 0;
+  const eloChange = calculateEloChange(currentRating, opponentRating, actualScore, kFactor);
+  return Math.round(currentRating + eloChange);
+}
+
+/**
+ * Validate rating is within reasonable bounds
+ * @param rating Rating to validate
+ * @returns Whether the rating is valid
+ */
+export function isValidRating(rating: number): boolean {
+  return rating >= 100 && rating <= 3000;
+}
+
+/**
+ * Get rating tier name based on rating
+ * @param rating Player rating
+ * @returns Tier name
+ */
+export function getRatingTier(rating: number): string {
+  if (rating < 1100) return 'Beginner';
+  if (rating < 1300) return 'Novice';
+  if (rating < 1500) return 'Intermediate';
+  if (rating < 1700) return 'Advanced';
+  if (rating < 1900) return 'Expert';
+  if (rating < 2100) return 'Master';
+  return 'Grandmaster';
+}
+
+/**
+ * Calculate expected score for a team match
+ * @param team1Rating Average rating of team 1
+ * @param team2Rating Average rating of team 2
+ * @returns Expected score for team 1
+ */
+export function calculateExpectedTeamScore(team1Rating: number, team2Rating: number): number {
+  return calculateExpectedScore(team1Rating, team2Rating);
+}
+
+/**
+ * Calculate Elo change for team match
+ * @param team1Rating Average rating of team 1
+ * @param team2Rating Average rating of team 2
+ * @param team1Score Actual score for team 1 (1 = win, 0.5 = draw, 0 = loss)
+ * @param kFactor K-factor (default 32)
+ * @returns Elo change for team 1
+ */
+export function calculateTeamEloChange(
+  team1Rating: number,
+  team2Rating: number,
+  team1Score: number,
+  kFactor: number = 32
+): number {
+  return calculateEloChange(team1Rating, team2Rating, team1Score, kFactor);
+}
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+import { getSession } from './auth-simple';
+import { prisma } from './prisma';
+
+export type UserRole = 'player' | 'tournament_admin' | 'club_admin';
+
+export interface PermissionCheck {
+  allowed: boolean;
+  reason?: string;
+}
+
+/**
+ * Check if the current user has the required role
+ * Reads role from database to avoid session cache issues
+ */
+export async function hasRole(requiredRole: UserRole): Promise<PermissionCheck> {
+  const session = await getSession();
+  
+  if (!session) {
+    return { allowed: false, reason: 'Not authenticated' };
+  }
+
+  const userId = session.user?.id;
+  if (!userId) {
+    return { allowed: false, reason: 'User ID not found in session' };
+  }
+
+  // Fetch user from database to get current role (bypasses session cache)
+  const user = await prisma.user.findUnique({
+    where: { id: userId },
+    select: { role: true }
+  });
+
+  if (!user) {
+    return { allowed: false, reason: 'User not found in database' };
+  }
+
+  const userRole = user.role as UserRole;
+  
+  // Role hierarchy: player < tournament_admin < club_admin
+  const roleHierarchy: Record<UserRole, number> = {
+    'player': 1,
+    'tournament_admin': 2,
+    'club_admin': 3
+  };
+
+  const hasRequiredRole = roleHierarchy[userRole] >= roleHierarchy[requiredRole];
+  
+  return {
+    allowed: hasRequiredRole,
+    reason: hasRequiredRole ? undefined : `Requires ${requiredRole} role, but user has ${userRole}`
+  };
+}
+
+/**
+ * Check if the user owns the tournament (for tournament_admin)
+ */
+export async function ownsTournament(tournamentId: number): Promise<PermissionCheck> {
+  const session = await getSession();
+  
+  if (!session) {
+    return { allowed: false, reason: 'Not authenticated' };
+  }
+
+  const userId = session.user?.id;
+  if (!userId) {
+    return { allowed: false, reason: 'User ID not found in session' };
+  }
+
+  const tournament = await prisma.event.findUnique({
+    where: { id: tournamentId },
+    select: { ownerId: true }
+  });
+
+  if (!tournament) {
+    return { allowed: false, reason: 'Tournament not found' };
+  }
+
+  const isOwner = tournament.ownerId === userId;
+  
+  return {
+    allowed: isOwner,
+    reason: isOwner ? undefined : 'User does not own this tournament'
+  };
+}
+
+/**
+ * Check if the user can manage a specific tournament
+ * Tournament admins can only manage their own tournaments
+ * Club admins can manage all tournaments
+ * Reads role from database to avoid session cache issues
+ */
+export async function canManageTournament(tournamentId: number): Promise<PermissionCheck> {
+  const session = await getSession();
+  
+  if (!session) {
+    return { allowed: false, reason: 'Not authenticated' };
+  }
+
+  const userId = session.user?.id;
+  if (!userId) {
+    return { allowed: false, reason: 'User ID not found in session' };
+  }
+
+  // Fetch user from database to get current role (bypasses session cache)
+  const user = await prisma.user.findUnique({
+    where: { id: userId },
+    select: { role: true }
+  });
+
+  if (!user) {
+    return { allowed: false, reason: 'User not found in database' };
+  }
+
+  const userRole = user.role as UserRole;
+  
+  // Club admins can manage all tournaments
+  if (userRole === 'club_admin') {
+    return { allowed: true };
+  }
+
+  // Tournament admins can only manage their own tournaments
+  if (userRole === 'tournament_admin') {
+    return ownsTournament(tournamentId);
+  }
+
+  return { allowed: false, reason: 'Insufficient permissions to manage tournament' };
+}
+
+/**
+ * Check if the user can create tournaments
+ */
+export async function canCreateTournaments(): Promise<PermissionCheck> {
+  return hasRole('tournament_admin');
+}
+
+/**
+ * Check if the user can manage a specific match
+ * Tournament admins can manage matches in their own tournaments
+ * Club admins can manage all matches
+ */
+export async function canManageMatch(matchId: number): Promise<PermissionCheck> {
+  const session = await getSession();
+  
+  if (!session) {
+    return { allowed: false, reason: 'Not authenticated' };
+  }
+
+  const userRole = session.user?.role as UserRole;
+  
+  // Club admins can manage all matches
+  if (userRole === 'club_admin') {
+    return { allowed: true };
+  }
+
+  // Tournament admins can only manage matches in their own tournaments
+  if (userRole === 'tournament_admin') {
+    const match = await prisma.match.findUnique({
+      where: { id: matchId },
+      include: { event: true }
+    });
+
+    if (!match || !match.event) {
+      return { allowed: false, reason: 'Match or tournament not found' };
+    }
+
+    return ownsTournament(match.event.id);
+  }
+
+  return { allowed: false, reason: 'Insufficient permissions to manage match' };
+}
+
+/**
+ * Check if the user can assign tournament_admin privileges
+ * Only club admins can assign tournament_admin role
+ */
+export async function canAssignTournamentAdmin(): Promise<PermissionCheck> {
+  return hasRole('club_admin');
+}
+
+/**
+ * Get tournaments that the current user can manage
+ */
+export async function getManageableTournaments() {
+  const session = await getSession();
+  
+  if (!session) {
+    return [];
+  }
+
+  const userRole = session.user?.role as UserRole;
+  const userId = session.user?.id;
+
+  if (userRole === 'club_admin') {
+    // Club admins can see all tournaments
+    return prisma.event.findMany({
+      where: { eventType: 'tournament' },
+      orderBy: { createdAt: 'desc' }
+    });
+  }
+
+  if (userRole === 'tournament_admin') {
+    // Tournament admins can only see their own tournaments
+    return prisma.event.findMany({
+      where: { 
+        eventType: 'tournament',
+        ownerId: userId
+      },
+      orderBy: { createdAt: 'desc' }
+    });
+  }
+
+  // Regular players can only view tournaments (not manage them)
+  return prisma.event.findMany({
+    where: { eventType: 'tournament', status: { not: 'draft' } },
+    orderBy: { createdAt: 'desc' }
+  });
+}
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+/**
+ * Tournament utility functions
+ * Used for calculating dynamic tournament status based on event date
+ */
+
+/**
+ * Calculates the tournament status based on the event date
+ * @param eventDate - The date of the tournament event
+ * @returns The calculated status string: "planned" or "completed"
+ */
+export function getTournamentStatus(eventDate: Date | null): string {
+  if (!eventDate) {
+    return "planned";
+  }
+
+  const now = new Date();
+  const eventDateObj = new Date(eventDate);
+
+  // If event date is in the past, it's completed
+  if (eventDateObj < now) {
+    return "completed";
+  }
+
+  // If event date is today or in the future, it's planned
+  return "planned";
+}
+
+/**
+ * Checks if a tournament date is in the past
+ * @param eventDate - The date of the tournament event
+ * @returns true if the event date is in the past, false otherwise
+ */
+export function isTournamentPast(eventDate: Date | null): boolean {
+  if (!eventDate) {
+    return false;
+  }
+
+  const now = new Date();
+  const eventDateObj = new Date(eventDate);
+  return eventDateObj < now;
+}
+
+/**
+ * Checks if a tournament date is in the future
+ * @param eventDate - The date of the tournament event
+ * @returns true if the event date is in the future, false otherwise
+ */
+export function isTournamentFuture(eventDate: Date | null): boolean {
+  if (!eventDate) {
+    return false;
+  }
+
+  const now = new Date();
+  const eventDateObj = new Date(eventDate);
+  return eventDateObj > now;
+}