public enum PrismLeaderboardPeriod: String, Codable, Sendable, CaseIterable {
    case daily      // Reset every 24 hours
    case weekly     // Reset every 7 days
    case monthly    // Reset every calendar month
    case allTime    // Never reset
}

let entry = try await manager.submitScore(
    userID: "user-42",
    displayName: "Alice",
    score: 1500,
    period: .weekly
)
print(entry.rank) // 1

let entry = try await manager.updateScore(
    userID: "user-42",
    score: 2000,
    period: .weekly
)

let snapshot = try await manager.leaderboard(
    period: .weekly,
    limit: 50
)

for entry in snapshot.entries {
    print("#\(entry.rank) \(entry.displayName): \(entry.score)")
}

let entry = try await manager.rank(for: "user-42", period: .weekly)
print("#\(entry.rank) — \(entry.score) pts")

let entries = snapshot.entries.sorted() // rank 1, 2, 3...

try await manager.resetLeaderboard(period: .daily)

for await event in manager.events {
    if case .leaderboardUpdated(let userID, let newRank) = event {
        print("\(userID) moved to rank #\(newRank)")
    }
}

let periods: [PrismLeaderboardPeriod] = [.daily, .weekly, .monthly, .allTime]

for period in periods {
    try await manager.submitScore(
        userID: currentUser.id,
        displayName: currentUser.name,
        score: currentUser.totalScore,
        period: period
    )
}