import XCTest
@testable import RouterOSAssistant

/// Regression tests for bugs.md #11 (2026-09-17): creating an `/ip pool` entry in the Experte tab
/// hung the app permanently, traced to `SSHTransport.connect()`/`run(_:)` having no timeout at
/// all — a stalled connection attempt or command execution had no way to ever resolve. These
/// tests exercise the generic race mechanism (`SSHTransport.withTimeout`) directly, independent
/// of Citadel/real network I/O, since that's the actual bug: the race logic itself, not anything
/// SSH-specific.
final class SSHTransportTimeoutTests: XCTestCase {
    func testFastOperationReturnsItsResultBeforeTheDeadline() async throws {
        let result = try await SSHTransport.withTimeout(.seconds(1)) {
            "done"
        }
        XCTAssertEqual(result, "done")
    }

    func testHangingOperationThrowsAfterTheDeadlineInsteadOfBlockingForever() async {
        let start = ContinuousClock.now
        do {
            _ = try await SSHTransport.withTimeout(.milliseconds(200)) {
                try await Task.sleep(for: .seconds(60))
                return "never reached"
            }
            XCTFail("Expected a timeout error")
        } catch {
            let elapsed = ContinuousClock.now - start
            XCTAssertLessThan(elapsed, .seconds(5), "Timeout should fire close to the deadline, not wait for the full 60s operation")
        }
    }

    func testOperationsOwnThrownErrorPropagatesUnchangedWhenItFinishesFirst() async {
        struct SampleError: Error, Equatable {}
        do {
            _ = try await SSHTransport.withTimeout(.seconds(1)) {
                throw SampleError()
            }
            XCTFail("Expected SampleError to propagate")
        } catch is SampleError {
            // expected
        } catch {
            XCTFail("Expected SampleError, got \(error)")
        }
    }
}