import Foundation

/// Shared heuristic for detecting whether an arbitrary `Error` represents a
/// transport-level connectivity failure (vs a logical/server error). Every
/// module's `SyncError` previously re-implemented the same lowercase substring
/// match — extracted here so there is a single source of truth.
public enum SyncConnectionErrorHeuristic {
    /// Returns `true` when the error's localized description suggests the
    /// failure is caused by the local network being unable to reach the
    /// backend (DNS, refused connections, timeouts, unreachable host).
    public static func isConnectionError(_ error: Error) -> Bool {
        let msg = error.localizedDescription.lowercased()
        return msg.contains("network")
            || msg.contains("connection")
            || msg.contains("timeout")
            || msg.contains("unreachable")
            || msg.contains("could not connect")
            || msg.contains("offline")
    }
}