/// Tests for LLM router resilience to health tracking failures
///
/// Verifies that the LLM router continues with valid routing decisions even when
/// health tracking operations fail (UnknownEndpoint, HttpClientCreationFailed, etc.).
///
/// RATIONALE: Health tracking is observability infrastructure, not core functionality.
/// A successful routing decision (LLM returned "FAST"/"BALANCED"/"DEEP") should not
/// be discarded due to transient health tracking issues.
use octoroute::config::Config;
use octoroute::metrics::Metrics;
use octoroute::models::selector::ModelSelector;
use octoroute::router::llm_based::LlmBasedRouter;
use octoroute::router::{RouteMetadata, TargetModel};
use std::sync::Arc;

/// Test that LLM router continues with valid routing decision when mark_success fails
///
/// SCENARIO: LLM router successfully gets routing decision from LLM, but health tracking
/// fails when trying to mark the router endpoint as healthy (e.g., due to config reload race).
///
/// EXPECTED: Router should log a warning but return the valid routing decision, not an error.
/// Health tracking failures should not discard successful routing decisions.
///
/// This test is currently EXPECTED TO FAIL because the LLM router propagates health
/// tracking errors instead of warning and continuing (like the chat handler does).
#[tokio::test]
async fn test_llm_router_continues_on_health_tracking_failure() {
    // ARRANGE: Create config with balanced tier for router
    let toml = r#"
        [server]
        host = "127.0.0.1"
        port = 3000

        [[models.fast]]
        name = "test-fast"
        base_url = "http://192.0.2.1:11434/v1"  # TEST-NET-1 (non-routable for testing)
        max_tokens = 4096

        [[models.balanced]]
        name = "test-balanced"
        base_url = "http://192.0.2.2:1234/v1"  # TEST-NET-1 (non-routable for testing)
        max_tokens = 8192

        [[models.deep]]
        name = "test-deep"
        base_url = "http://192.0.2.3:8080/v1"  # TEST-NET-1 (non-routable for testing)
        max_tokens = 16384

        [routing]
        strategy = "llm"
        router_tier = "balanced"
    "#;

    let config: Config = toml::from_str(toml).expect("Failed to parse config");
    config.validate().expect("Config validation failed");
    let metrics = Arc::new(Metrics::new().expect("Failed to create metrics"));
    let selector = Arc::new(ModelSelector::new(
        Arc::new(config.clone()),
        metrics.clone(),
    ));

    // Create LLM router with balanced tier
    let router = LlmBasedRouter::new(selector.clone(), TargetModel::Balanced, 10, metrics.clone())
        .expect("Failed to create LLM router");

    // ACT: Attempt to route a request
    // This will fail because the router endpoint is non-routable (192.0.2.2)
    // BUT: The actual issue we're testing is what happens AFTER a successful LLM response
    // when mark_success fails
    //
    // NOTE: This test requires mocking or a more sophisticated setup to trigger the
    // mark_success failure AFTER a successful LLM routing decision. For now, this
    // demonstrates the test structure needed.

    let metadata = RouteMetadata::new(50);
    let result = router.route("What is 2+2?", &metadata).await;

    // ASSERT: We expect this to timeout (non-routable endpoint), but the test demonstrates
    // the structure needed. A proper test would require mocking to:
    // 1. Allow LLM query to succeed (return "FAST")
    // 2. Make mark_success fail (return UnknownEndpoint error)
    // 3. Verify router returns Ok(TargetModel::Fast) with a warning logged

    // For now, we document the expected behavior:
    // - If mark_success fails AFTER successful routing decision, should return Ok(decision)
    // - Should log warning: "Health tracking skipped: ..."
    // - Should NOT return Err(AppError::HealthTracking(...))

    assert!(
        result.is_err(),
        "Expected error due to non-routable endpoint (this test needs mocking to fully test health tracking resilience)"
    );
}
