Handle Structured Errors

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func handleRegionalOfflineError(_ error: Error?) {
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    guard let error else { return }
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    let nsError = error as NSError
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    guard nsError.domain == NGLRegionalOfflineErrorDomain else {
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        print("Unexpected error: \(nsError)")
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        return
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    }
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    let code = NGLRegionalOfflineError.Code(rawValue: nsError.code)
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    switch code {
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    case .networkUnavailable:
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        // Ask the user to check the network connection.
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        break
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    case .requestTimedOut:
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        // Offer a retry action.
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        break
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    case .httpStatus:
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        let statusCode =
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            nsError.userInfo[NGLRegionalOfflineErrorHTTPStatusCodeKey] as? Int
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        print("HTTP status: \(statusCode ?? 0)")
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    case .insufficientStorage:
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        // Ask the user to free device storage.
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        break
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    case .unsupportedTileServer:
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        // Switch NGLAccountManager to NGLTomTom before using Regional Offline.
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        break
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    case .invalidPackage, .packageDecompression, .packageInstallation:
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        // Retry the download and report persistent package failures.
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        break
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    default:
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        break
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    }
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    let requestURL =
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        nsError.userInfo[NGLRegionalOfflineErrorURLKey] as? String
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    let packageName =
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        nsError.userInfo[NGLRegionalOfflineErrorPackageNameKey] as? String
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    print(
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        "Regional offline failed: " +
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        "domain=\(nsError.domain) " +
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        "code=\(nsError.code) " +
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        "package=\(packageName ?? "-") " +
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        "url=\(requestURL ?? "-") " +
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        "message=\(nsError.localizedDescription)"
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    )
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}