//! Tests for health tracking failure warnings in ChatResponse
//!
//! Verifies that when health tracking operations (mark_success/mark_failure) fail,
//! these failures are surfaced to users as warnings in the ChatResponse, not just
//! logged internally.
//!
//! ## Rationale (from PR #4 Review - Issue #3)
//!
//! Health tracking failures were previously only logged as warnings. Users received
//! their response with no indication that health tracking was broken. This creates
//! a false sense of security where:
//! - Unhealthy endpoints may remain in rotation indefinitely (never marked unhealthy)
//! - Healthy endpoints may remain excluded indefinitely (never marked healthy)
//! - Operators have no visibility that health tracking is failing until they check logs
//!
//! By surfacing these failures as response warnings, operators get immediate feedback
//! that health state may be stale.

use octoroute::config::Config;
use octoroute::handlers::AppState;
use std::sync::Arc;

/// RED PHASE: Test that health tracking failures appear in ChatResponse warnings
///
/// This test will FAIL initially because health tracking failures are only logged,
/// not included in response warnings.
///
/// SCENARIO: After a successful LLM query, mark_success() fails (e.g., due to TLS error).
///
/// EXPECTED: ChatResponse should include a warning like:
///   "Health tracking failed: <error details> (endpoint health state may be stale)"
#[tokio::test]
#[ignore = "RED PHASE: Test will fail until implementation complete"]
async fn test_health_tracking_mark_success_failure_appears_in_warnings() {
    // This test requires:
    // 1. Mock LLM endpoint that succeeds
    // 2. Mechanism to force mark_success() to fail
    // 3. Verify ChatResponse.warnings contains health tracking error
    //
    // For now, document the expected behavior.
    // Full implementation requires test infrastructure for triggering health tracking failures.

    // ARRANGE: Create config with test endpoint
    let toml = r#"
        [server]
        host = "127.0.0.1"
        port = 3000
        request_timeout_seconds = 30

        [[models.fast]]
        name = "test-fast"
        base_url = "http://192.0.2.1:11434/v1"
        max_tokens = 4096
        temperature = 0.7
        weight = 1.0
        priority = 1

        [[models.balanced]]
        name = "test-balanced"
        base_url = "http://192.0.2.2:1234/v1"
        max_tokens = 8192
        temperature = 0.7
        weight = 1.0
        priority = 1

        [[models.deep]]
        name = "test-deep"
        base_url = "http://192.0.2.3:8080/v1"
        max_tokens = 16384
        temperature = 0.7
        weight = 1.0
        priority = 1

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

    let config: Config = toml::from_str(toml).expect("should parse config");
    let _state = AppState::new(Arc::new(config)).expect("should create AppState");

    // ACT: Send chat request (would need mock LLM that succeeds + forced health tracking failure)
    // For now, test just verifies it compiles

    // ASSERT: Verify response includes warning
    // Expected warning format:
    //   "Health tracking failed: <error> (endpoint health state may be stale)"
    //
    // This warning tells operators that:
    // 1. The LLM query succeeded and they got a valid response
    // 2. But health tracking couldn't update the endpoint's health status
    // 3. Future requests may incorrectly route due to stale health state
}

/// RED PHASE: Test that health tracking mark_failure warnings appear in error responses
///
/// SCENARIO: LLM query fails, but mark_failure() also fails when trying to track it.
///
/// EXPECTED: The error response should still fail (query failed), but if the error
/// includes context, it should mention that health tracking also failed.
///
/// NOTE: This is lower priority since the request is already failing. The critical case
/// is when the LLM succeeds but health tracking fails (test above).
#[tokio::test]
#[ignore = "RED PHASE: Test will fail until implementation complete"]
async fn test_health_tracking_mark_failure_failure_logged() {
    // This test verifies that when mark_failure() fails:
    // 1. The original LLM query error is still returned (not masked)
    // 2. Health tracking failure is logged for operator visibility
    // 3. Request continues to retry logic (not blocked by health tracking failure)
    //
    // Lower priority than mark_success case because request is already failing.
}

/// Test that multiple health tracking failures accumulate in warnings
///
/// SCENARIO: Multiple retry attempts, each with health tracking failures.
///
/// EXPECTED: All health tracking failures should appear in warnings array.
#[tokio::test]
#[ignore = "RED PHASE: Test will fail until implementation complete"]
async fn test_multiple_health_tracking_failures_accumulate() {
    // Test that if multiple mark_success/mark_failure calls fail during retries,
    // all failures appear in the warnings array (not just the first one).
    //
    // This ensures operators have full visibility into health tracking issues.
}
