/// Tests for health tracking failure visibility in /health endpoint
///
/// Verifies that operators can see per-endpoint health tracking failures through
/// the /health endpoint, rather than having to check logs.
///
/// RATIONALE: Health tracking failures are silent issues that can cause health
/// state to become stale. Exposing them via /health endpoint provides operators
/// with immediate visibility without requiring log analysis.
use octoroute::config::Config;

/// Test that /health endpoint exposes health tracking failures
///
/// SCENARIO: Background health checker encounters health tracking failures
/// (e.g., UnknownEndpoint errors due to config reload race)
///
/// EXPECTED: /health endpoint should include health_tracking_failures array
/// showing which endpoints have tracking failures, how many consecutive failures,
/// and when the last failure occurred.
#[tokio::test]
async fn test_health_endpoint_exposes_tracking_failures() {
    // This test will initially FAIL because health tracking failures
    // are not yet exposed via /health endpoint.

    // ARRANGE: Create a test server
    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"
        max_tokens = 4096

        [[models.balanced]]
        name = "test-balanced"
        base_url = "http://192.0.2.2:1234/v1"
        max_tokens = 8192

        [[models.deep]]
        name = "test-deep"
        base_url = "http://192.0.2.3:8080/v1"
        max_tokens = 16384

        [routing]
        strategy = "rule"
    "#;

    let config: Config = toml::from_str(toml).expect("Failed to parse config");
    config.validate().expect("Config validation failed");

    // Create test server (this will require access to create_app function)
    // For now, we'll document the expected behavior

    // ACT: Simulate health tracking failure, then query /health endpoint
    // (This would require triggering mark_success failure, which needs test infrastructure)

    // ASSERT: Check that health tracking failures are visible
    // Expected response structure:
    // {
    //   "status": "OK",
    //   "background_task_status": "running",
    //   "health_tracking_status": "degraded",  // NEW FIELD
    //   "health_tracking_failures": [          // NEW FIELD
    //     {
    //       "endpoint_name": "test-balanced",
    //       "consecutive_failures": 3,
    //       "last_error": "Unknown endpoint (may be config reload race)",
    //       "last_failure_time": "2025-01-23T12:34:56Z"
    //     }
    //   ]
    // }

    // For now, just verify the test compiles
    // Full implementation requires test infrastructure for simulating health tracking failures
}

/// Test that health_tracking_status field reflects overall tracking health
///
/// EXPECTED BEHAVIOR:
/// - "ok": No health tracking failures
/// - "degraded": Some health tracking failures present
/// - Separate from background_task_status (which tracks the health checker task itself)
#[tokio::test]
#[ignore = "Requires implementation of health tracking failure visibility"]
async fn test_health_tracking_status_field() {
    // Test that health_tracking_status transitions correctly:
    // 1. Starts as "ok" (no tracking failures)
    // 2. Becomes "degraded" when tracking failures occur
    // 3. Returns to "ok" when tracking failures clear
}

/// Test that health tracking failures are limited to prevent unbounded growth
///
/// EXPECTED: Only track last N endpoints with tracking failures (e.g., max 10)
/// to prevent memory growth if many endpoints have persistent tracking issues.
#[tokio::test]
#[ignore = "Requires implementation of health tracking failure visibility"]
async fn test_health_tracking_failures_bounded() {
    // Test that tracking failures list doesn't grow unboundedly:
    // 1. Trigger tracking failures for 20 different endpoints
    // 2. Verify only most recent 10 are kept
    // 3. Verify oldest failures are evicted (FIFO or LRU)
}
