import Foundation // MARK: - Abacus Usage Error public enum AbacusUsageError: LocalizedError, Sendable, Equatable {    case noSessionCookie    case sessionExpired    case networkError(String)    case parseFailed(String)    case unauthorized     /// Whether this error indicates an authentication/session problem that    /// should trigger cache eviction.    public var isRecoverable: Bool {        switch self {        case .unauthorized, .sessionExpired: true        default: false        }    }     public var isAuthRelated: Bool {        self.isRecoverable    }     /// Whether browser-import scanning should continue to later sessions after    /// this failure. Imported sessions can differ by profile/browser, so we keep    /// scanning on per-session fetch failures and surface the first one only if    /// every candidate is exhausted.    var shouldTryNextImportedSession: Bool {        switch self {        case .unauthorized, .sessionExpired, .networkError, .parseFailed: true        case .noSessionCookie: false        }    }     /// Whether a cached cookie header should be evicted before falling back to    /// a fresh browser import. Parse/auth failures usually indicate that the    /// cached session is stale or no longer accepted.    var shouldClearCachedCookie: Bool {        switch self {        case .unauthorized, .sessionExpired, .parseFailed: true        case .networkError, .noSessionCookie: false        }    }     public var errorDescription: String? {        switch self {        case .noSessionCookie:            "No Abacus AI session found. Please log in to apps.abacus.ai in your browser "                + "or paste a Cookie header in manual mode."        case .sessionExpired:            "Abacus AI session expired. Please log in again."        case let .networkError(msg):            "Abacus AI API error: \(msg)"        case let .parseFailed(msg):            "Could not parse Abacus AI usage: \(msg)"        case .unauthorized:            "Unauthorized. Please log in to Abacus AI."        }    }} #if !os(macOS)extension AbacusUsageError {    public static let notSupported = AbacusUsageError.networkError("Abacus AI is only supported on macOS.")}#endif