//
//  OAuthTokenStorage.swift
//  FantasyWatch
//
//  Created by Claude Code
//

import Foundation

actor OAuthTokenStorage {
    private let ubiquitousStore = NSUbiquitousKeyValueStore.default

    private func accessTokenKey(for userID: String) -> String {
        "com.fantasyhockey.user.\(userID).yahoo.accessToken"
    }

    private func refreshTokenKey(for userID: String) -> String {
        "com.fantasyhockey.user.\(userID).yahoo.refreshToken"
    }

    private func tokenExpiryKey(for userID: String) -> String {
        "com.fantasyhockey.user.\(userID).yahoo.tokenExpiry"
    }

    func saveTokenPair(_ tokenPair: TokenPair, for userID: String) {
        ubiquitousStore.set(tokenPair.accessToken, forKey: accessTokenKey(for: userID))
        ubiquitousStore.set(tokenPair.refreshToken, forKey: refreshTokenKey(for: userID))
        ubiquitousStore.set(tokenPair.expiryDate.timeIntervalSince1970, forKey: tokenExpiryKey(for: userID))
        ubiquitousStore.synchronize()
    }

    func getAccessToken(for userID: String) -> String? {
        ubiquitousStore.string(forKey: accessTokenKey(for: userID))
    }

    func getRefreshToken(for userID: String) -> String? {
        ubiquitousStore.string(forKey: refreshTokenKey(for: userID))
    }

    func getTokenExpiry(for userID: String) -> Date? {
        let timestamp = ubiquitousStore.double(forKey: tokenExpiryKey(for: userID))
        guard timestamp > 0 else { return nil }
        return Date(timeIntervalSince1970: timestamp)
    }

    func isTokenValid(for userID: String) -> Bool {
        guard let expiryDate = getTokenExpiry(for: userID) else {
            return false
        }
        return expiryDate > Date().addingTimeInterval(60)
    }

    func clearTokens(for userID: String) {
        ubiquitousStore.removeObject(forKey: accessTokenKey(for: userID))
        ubiquitousStore.removeObject(forKey: refreshTokenKey(for: userID))
        ubiquitousStore.removeObject(forKey: tokenExpiryKey(for: userID))
        ubiquitousStore.synchronize()
    }
}