// EXTREME TDD: Runtime Behavior Tests - Phase 5
// ACTOR-008, ACTOR-009, ACTOR-010
// Test-first: ALL tests written BEFORE implementation
// Coverage target: 100% of runtime behaviors

use proptest::prelude::*;
use std::sync::Arc;
use std::time::{Duration, Instant};
use tokio::sync::{mpsc, oneshot, Mutex, RwLock};
use tokio::time::{sleep, timeout};

// ================================
// Runtime Message Processing Tests
// ================================

#[ignore]
#[tokio::test]
async fn test_actor_spawn_creates_mailbox() {
    let actor_code = r#"
        actor Counter {
            count: i32 = 0,

            receive increment() {
                self.count += 1
            }
        }
    "#;

    let runtime = ActorRuntime::new();
    let actor_ref = runtime.spawn_actor("Counter", actor_code).await;

    assert!(actor_ref.is_alive().await);
    assert_eq!(actor_ref.mailbox_size().await, 0);
}

#[ignore]
#[tokio::test]
async fn test_message_send_async_non_blocking() {
    let runtime = ActorRuntime::new();
    let actor = runtime.spawn_test_actor().await;

    let start = Instant::now();
    actor.send_async("process", vec![]).await;
    let elapsed = start.elapsed();

    assert!(elapsed < Duration::from_micros(10));
}

#[ignore]
#[tokio::test]
async fn test_message_send_sync_blocks_until_response() {
    let runtime = ActorRuntime::new();
    let actor = runtime.spawn_test_actor().await;

    let result = actor.send_sync("compute", vec![42]).await;

    assert_eq!(result, Ok(Value::Int(84)));
}

#[ignore]
#[tokio::test]
async fn test_message_ordering_fifo_guaranteed() {
    let runtime = ActorRuntime::new();
    let actor = runtime.spawn_test_actor().await;

    for i in 0..100 {
        actor.send_async("append", vec![i]).await;
    }

    let result = actor.send_sync("get_all", vec![]).await;
    let values = result.unwrap().as_array().unwrap();

    for (i, val) in values.iter().enumerate() {
        assert_eq!(val.as_int(), Some(i as i64));
    }
}

#[ignore]
#[tokio::test]
async fn test_mailbox_overflow_applies_backpressure() {
    let runtime = ActorRuntime::new();
    let actor = runtime
        .spawn_actor_with_config(ActorConfig {
            mailbox_size: 10,
            ..Default::default()
        })
        .await;

    // Fill mailbox
    for _ in 0..10 {
        actor.send_async("slow_process", vec![]).await;
    }

    // This should block until mailbox has space
    let start = Instant::now();
    timeout(
        Duration::from_millis(100),
        actor.send_async("one_more", vec![]),
    )
    .await;

    assert!(start.elapsed() > Duration::from_millis(50));
}

#[ignore]
#[tokio::test]
async fn test_selective_receive_pattern_matching() {
    let actor_code = r#"
        actor PatternMatcher {
            receive {
                Message::Text(s) if s.starts_with("hello") => {
                    println!("Greeting: {}", s)
                }
                Message::Number(n) if n > 100 => {
                    println!("Large number: {}", n)
                }
                _ => {
                    println!("Other message")
                }
            }
        }
    "#;

    let runtime = ActorRuntime::new();
    let actor = runtime.spawn_from_code(actor_code).await;

    actor.send(Message::Text("hello world")).await;
    actor.send(Message::Number(150)).await;
    actor.send(Message::Text("goodbye")).await;

    // Verify selective processing
    let log = actor.get_output_log().await;
    assert!(log[0].contains("Greeting"));
    assert!(log[1].contains("Large number"));
    assert!(log[2].contains("Other"));
}

// ================================
// Concurrency & Isolation Tests
// ================================

#[ignore]
#[tokio::test]
async fn test_actor_isolation_no_shared_state() {
    let runtime = ActorRuntime::new();

    let actor1 = runtime.spawn_counter_actor().await;
    let actor2 = runtime.spawn_counter_actor().await;

    actor1.send("increment", vec![]).await;
    actor1.send("increment", vec![]).await;

    let count1 = actor1.send_sync("get_count", vec![]).await;
    let count2 = actor2.send_sync("get_count", vec![]).await;

    assert_eq!(count1, Ok(Value::Int(2)));
    assert_eq!(count2, Ok(Value::Int(0)));
}

#[ignore]
#[tokio::test]
async fn test_concurrent_actors_process_independently() {
    let runtime = ActorRuntime::new();
    let num_actors = 100;

    let actors: Vec<_> = (0..num_actors)
        .map(|_| runtime.spawn_worker_actor())
        .collect::<FuturesUnordered<_>>()
        .collect()
        .await;

    // Send work to all actors concurrently
    let mut futures = FuturesUnordered::new();
    for (i, actor) in actors.iter().enumerate() {
        futures.push(actor.send_sync("compute", vec![i as i64]));
    }

    // Collect all results
    let results: Vec<_> = futures.collect().await;

    // Verify all processed independently
    for (i, result) in results.iter().enumerate() {
        assert_eq!(result, &Ok(Value::Int((i * 2) as i64)));
    }
}

#[ignore]
#[tokio::test]
async fn test_actor_handles_concurrent_messages() {
    let runtime = ActorRuntime::new();
    let actor = runtime.spawn_accumulator_actor().await;

    // Send 1000 messages concurrently
    let mut handles = vec![];
    for i in 0..1000 {
        let actor_clone = actor.clone();
        handles.push(tokio::spawn(async move {
            actor_clone.send("add", vec![Value::Int(1)]).await
        }));
    }

    futures::future::join_all(handles).await;

    let total = actor.send_sync("get_total", vec![]).await;
    assert_eq!(total, Ok(Value::Int(1000)));
}

#[ignore]
#[tokio::test]
async fn test_actor_location_transparency() {
    let runtime = ActorRuntime::new();

    // Spawn on different executors
    let local_actor = runtime.spawn_local_actor().await;
    let remote_actor = runtime.spawn_remote_actor("node2").await;

    // Same interface regardless of location
    let local_result = local_actor.send_sync("ping", vec![]).await;
    let remote_result = remote_actor.send_sync("ping", vec![]).await;

    assert_eq!(local_result, Ok(Value::String("pong")));
    assert_eq!(remote_result, Ok(Value::String("pong")));
}

// ================================
// Supervision & Fault Tolerance Tests
// ================================

#[ignore]
#[tokio::test]
async fn test_supervisor_restarts_failed_actor() {
    let supervisor_code = r#"
        supervisor MySupervisor {
            strategy: OneForOne,
            max_restarts: 3,

            children {
                actor Worker {
                    receive work(n: i32) {
                        if n == 13 {
                            panic!("Unlucky number!")
                        }
                        n * 2
                    }
                }
            }
        }
    "#;

    let runtime = ActorRuntime::new();
    let supervisor = runtime.spawn_supervisor(supervisor_code).await;
    let worker = supervisor.get_child("Worker").await;

    // Normal operation
    assert_eq!(worker.send_sync("work", vec![5]).await, Ok(Value::Int(10)));

    // Trigger failure
    worker.send("work", vec![13]).await;
    sleep(Duration::from_millis(100)).await;

    // Verify restart
    assert!(worker.is_alive().await);
    assert_eq!(worker.send_sync("work", vec![7]).await, Ok(Value::Int(14)));
}

#[ignore]
#[tokio::test]
async fn test_supervisor_one_for_all_strategy() {
    let supervisor = create_one_for_all_supervisor().await;

    let worker1 = supervisor.get_child("Worker1").await;
    let worker2 = supervisor.get_child("Worker2").await;

    // Set state in both actors
    worker1.send("set_state", vec!["active"]).await;
    worker2.send("set_state", vec!["ready"]).await;

    // Crash worker1
    worker1.send("crash", vec![]).await;
    sleep(Duration::from_millis(200)).await;

    // Both should be restarted with clean state
    let state1 = worker1.send_sync("get_state", vec![]).await;
    let state2 = worker2.send_sync("get_state", vec![]).await;

    assert_eq!(state1, Ok(Value::String("initial")));
    assert_eq!(state2, Ok(Value::String("initial")));
}

#[ignore]
#[tokio::test]
async fn test_supervisor_rest_for_one_strategy() {
    let supervisor = create_rest_for_one_supervisor().await;

    let workers = vec![
        supervisor.get_child("Worker1").await,
        supervisor.get_child("Worker2").await,
        supervisor.get_child("Worker3").await,
    ];

    // Crash Worker2
    workers[1].send("crash", vec![]).await;
    sleep(Duration::from_millis(200)).await;

    // Worker1 should be unchanged, Worker2 and Worker3 restarted
    assert!(workers[0].has_original_pid().await);
    assert!(!workers[1].has_original_pid().await);
    assert!(!workers[2].has_original_pid().await);
}

#[ignore]
#[tokio::test]
async fn test_supervisor_max_restarts_limit() {
    let supervisor = create_supervisor_with_limit(2).await;
    let worker = supervisor.get_child("Worker").await;

    // Crash 3 times
    for _ in 0..3 {
        worker.send("crash", vec![]).await;
        sleep(Duration::from_millis(100)).await;
    }

    // After 3rd crash, supervisor should stop
    assert!(!supervisor.is_alive().await);
    assert!(!worker.is_alive().await);
}

#[ignore]
#[tokio::test]
async fn test_supervisor_restart_with_backoff() {
    let supervisor = create_supervisor_with_backoff().await;
    let worker = supervisor.get_child("Worker").await;

    let mut restart_times = vec![];

    for _ in 0..3 {
        let start = Instant::now();
        worker.send("crash", vec![]).await;

        // Wait for restart
        while !worker.is_alive().await {
            sleep(Duration::from_millis(10)).await;
        }

        restart_times.push(start.elapsed());
    }

    // Each restart should take longer (exponential backoff)
    assert!(restart_times[1] > restart_times[0]);
    assert!(restart_times[2] > restart_times[1]);
}

#[ignore]
#[tokio::test]
async fn test_lifecycle_hooks_execution_order() {
    let actor_code = r#"
        actor LifecycleActor {
            log: Vec<String> = vec![],

            hook pre_start() {
                self.log.push("pre_start")
            }

            hook post_stop() {
                self.log.push("post_stop")
            }

            hook pre_restart(reason: String) {
                self.log.push(format!("pre_restart: {}", reason))
            }

            hook post_restart() {
                self.log.push("post_restart")
            }

            receive get_log() -> Vec<String> {
                self.log.clone()
            }
        }
    "#;

    let runtime = ActorRuntime::new();
    let supervisor = runtime.spawn_supervised_actor(actor_code).await;
    let actor = supervisor.get_child("LifecycleActor").await;

    // Initial start
    let log1 = actor.send_sync("get_log", vec![]).await.unwrap();
    assert_eq!(log1[0], "pre_start");

    // Trigger restart
    actor.send("crash", vec![]).await;
    sleep(Duration::from_millis(100)).await;

    let log2 = actor.send_sync("get_log", vec![]).await.unwrap();
    assert_eq!(log2[0], "pre_start");
    assert_eq!(log2[1], "post_restart");
}

// ================================
// Message Delivery Guarantees Tests
// ================================

#[ignore]
#[tokio::test]
async fn test_at_most_once_delivery() {
    let runtime = ActorRuntime::new();
    let actor = runtime.spawn_counter_actor().await;

    // Send same message reference multiple times
    let msg = Message::Increment {
        id: uuid::Uuid::new_v4(),
    };

    for _ in 0..5 {
        actor.send(msg.clone()).await;
    }

    let count = actor.send_sync("get_count", vec![]).await;
    assert_eq!(count, Ok(Value::Int(1))); // Delivered at most once
}

#[ignore]
#[tokio::test]
async fn test_message_timeout_handling() {
    let actor_code = r#"
        actor SlowActor {
            receive slow_operation() -> i32 {
                sleep(1000);  // 1 second
                42
            }
        }
    "#;

    let runtime = ActorRuntime::new();
    let actor = runtime.spawn_from_code(actor_code).await;

    let result = timeout(
        Duration::from_millis(100),
        actor.send_sync("slow_operation", vec![]),
    )
    .await;

    assert!(result.is_err());
    assert!(matches!(result, Err(Elapsed)));
}

#[ignore]
#[tokio::test]
async fn test_dead_letter_queue() {
    let runtime = ActorRuntime::new();
    let actor = runtime.spawn_test_actor().await;

    // Stop the actor
    actor.stop().await;

    // Send message to dead actor
    actor.send("hello", vec![]).await;

    // Message should be in dead letter queue
    let dead_letters = runtime.get_dead_letter_queue().await;
    assert_eq!(dead_letters.len(), 1);
    assert_eq!(dead_letters[0].recipient, actor.id());
    assert_eq!(dead_letters[0].message, "hello");
}

// ================================
// Performance & Scalability Tests
// ================================

#[ignore]
#[tokio::test]
async fn test_actor_spawn_performance_p99() {
    let runtime = ActorRuntime::new();
    let mut spawn_times = vec![];

    for _ in 0..1000 {
        let start = Instant::now();
        let _actor = runtime.spawn_minimal_actor().await;
        spawn_times.push(start.elapsed());
    }

    spawn_times.sort();
    let p99 = spawn_times[990];

    assert!(p99 < Duration::from_micros(100));
}

#[ignore]
#[tokio::test]
async fn test_message_send_performance_p99() {
    let runtime = ActorRuntime::new();
    let actor = runtime.spawn_echo_actor().await;
    let mut send_times = vec![];

    // Warm up
    for _ in 0..100 {
        actor.send("warmup", vec![]).await;
    }

    // Measure
    for _ in 0..10000 {
        let start = Instant::now();
        actor.send("ping", vec![]).await;
        send_times.push(start.elapsed());
    }

    send_times.sort();
    let p99 = send_times[9900];

    assert!(p99 < Duration::from_micros(1));
}

#[ignore]
#[tokio::test]
async fn test_actor_memory_overhead() {
    let runtime = ActorRuntime::new();

    let before_mem = get_memory_usage();

    let actors: Vec<_> = (0..1000)
        .map(|_| runtime.spawn_minimal_actor())
        .collect::<FuturesUnordered<_>>()
        .collect()
        .await;

    let after_mem = get_memory_usage();
    let overhead_per_actor = (after_mem - before_mem) / 1000;

    assert!(overhead_per_actor < 10_000); // Less than 10KB per actor
}

#[ignore]
#[tokio::test]
async fn test_supervision_overhead() {
    let runtime = ActorRuntime::new();

    // Measure supervised actor
    let start = Instant::now();
    let supervised = runtime.spawn_supervised_actor().await;
    let supervised_time = start.elapsed();

    // Measure unsupervised actor
    let start = Instant::now();
    let unsupervised = runtime.spawn_unsupervised_actor().await;
    let unsupervised_time = start.elapsed();

    // Supervision overhead should be minimal
    let overhead = supervised_time - unsupervised_time;
    assert!(overhead < Duration::from_micros(50));
}

// ================================
// State Management Tests
// ================================

#[ignore]
#[tokio::test]
async fn test_actor_state_persistence_across_restarts() {
    let actor_code = r#"
        actor StatefulActor {
            #[persist]
            data: HashMap<String, Value> = HashMap::new(),

            receive set(key: String, value: Value) {
                self.data.insert(key, value);
            }

            receive get(key: String) -> Option<Value> {
                self.data.get(&key).cloned()
            }
        }
    "#;

    let runtime = ActorRuntime::new();
    let supervisor = runtime.spawn_supervised_actor(actor_code).await;
    let actor = supervisor.get_child("StatefulActor").await;

    // Set state
    actor.send("set", vec!["key1", "value1"]).await;

    // Crash and restart
    actor.send("crash", vec![]).await;
    sleep(Duration::from_millis(100)).await;

    // State should be restored
    let value = actor.send_sync("get", vec!["key1"]).await;
    assert_eq!(value, Ok(Some(Value::String("value1"))));
}

#[ignore]
#[tokio::test]
async fn test_actor_state_isolation() {
    let runtime = ActorRuntime::new();

    let actor1 = runtime.spawn_stateful_actor().await;
    let actor2 = runtime.spawn_stateful_actor().await;

    actor1.send("set_state", vec!["state1"]).await;
    actor2.send("set_state", vec!["state2"]).await;

    let state1 = actor1.send_sync("get_state", vec![]).await;
    let state2 = actor2.send_sync("get_state", vec![]).await;

    assert_eq!(state1, Ok(Value::String("state1")));
    assert_eq!(state2, Ok(Value::String("state2")));
}

// ================================
// Property-Based Runtime Tests
// ================================

proptest! {
    #[ignore]
    #[test]
    fn prop_message_ordering_preserved(
        messages in prop::collection::vec(any::<String>(), 1..100)
    ) {
        let runtime = tokio::runtime::Runtime::new().unwrap();
        runtime.block_on(async {
            let actor_runtime = ActorRuntime::new();
            let actor = actor_runtime.spawn_collector_actor().await;

            for msg in &messages {
                actor.send("collect", vec![msg.clone()]).await;
            }

            let collected = actor.send_sync("get_all", vec![]).await.unwrap();
            let collected_msgs = collected.as_array().unwrap();

            for (i, msg) in messages.iter().enumerate() {
                assert_eq!(collected_msgs[i].as_string(), Some(msg.as_str()));
            }
        });
    }

    #[ignore]
    #[test]
    fn prop_supervision_always_maintains_invariants(
        num_crashes in 0..10usize,
        num_messages in 10..100usize
    ) {
        let runtime = tokio::runtime::Runtime::new().unwrap();
        runtime.block_on(async {
            let actor_runtime = ActorRuntime::new();
            let supervisor = actor_runtime.spawn_invariant_supervisor().await;
            let actor = supervisor.get_child("InvariantActor").await;

            for i in 0..num_messages {
                if num_crashes > 0 && i % (num_messages / num_crashes) == 0 {
                    actor.send("crash", vec![]).await;
                    sleep(Duration::from_millis(50)).await;
                }
                actor.send("increment", vec![]).await;
            }

            let invariant = actor.send_sync("check_invariant", vec![]).await;
            assert_eq!(invariant, Ok(Value::Bool(true)));
        });
    }

    #[ignore]
    #[test]
    fn prop_concurrent_actors_maintain_isolation(
        num_actors in 2..20usize,
        operations_per_actor in 10..100usize
    ) {
        let runtime = tokio::runtime::Runtime::new().unwrap();
        runtime.block_on(async {
            let actor_runtime = ActorRuntime::new();

            let actors: Vec<_> = (0..num_actors)
                .map(|i| actor_runtime.spawn_isolated_actor(i))
                .collect::<FuturesUnordered<_>>()
                .collect().await;

            let mut handles = vec![];
            for (i, actor) in actors.iter().enumerate() {
                for op in 0..operations_per_actor {
                    let actor_clone = actor.clone();
                    handles.push(tokio::spawn(async move {
                        actor_clone.send("process", vec![op]).await
                    }));
                }
            }

            futures::future::join_all(handles).await;

            // Verify each actor processed only its own operations
            for (i, actor) in actors.iter().enumerate() {
                let result = actor.send_sync("get_processed", vec![]).await;
                let processed = result.unwrap().as_int().unwrap();
                assert_eq!(processed as usize, operations_per_actor);
            }
        });
    }
}

// ================================
// Distributed Actor Tests
// ================================

#[ignore]
#[tokio::test]
async fn test_remote_actor_discovery() {
    let runtime = ActorRuntime::new();
    runtime.enable_clustering("node1").await;

    // Spawn actor on remote node
    let remote = runtime.spawn_on_node("node2", "RemoteActor").await;

    // Discover by name
    let discovered = runtime.discover_actor("RemoteActor").await;

    assert_eq!(discovered.unwrap().id(), remote.id());
}

#[ignore]
#[tokio::test]
async fn test_cluster_node_failure_detection() {
    let runtime = ActorRuntime::new();
    runtime.enable_clustering("node1").await;
    runtime.join_cluster(vec!["node2", "node3"]).await;

    // Monitor node health
    let mut health_monitor = runtime.subscribe_node_health().await;

    // Simulate node2 failure
    runtime.simulate_node_failure("node2").await;

    let event = health_monitor.recv().await.unwrap();
    assert!(matches!(event, NodeEvent::Down("node2")));
}

#[ignore]
#[tokio::test]
async fn test_actor_migration_on_node_failure() {
    let runtime = ActorRuntime::new();
    runtime.enable_clustering("node1").await;

    let actor = runtime.spawn_on_node("node2", "MigratableActor").await;
    let original_node = actor.current_node().await;

    // Node2 fails
    runtime.simulate_node_failure("node2").await;
    sleep(Duration::from_millis(200)).await;

    // Actor should be migrated to another node
    let new_node = actor.current_node().await;
    assert_ne!(original_node, new_node);
    assert!(actor.is_alive().await);
}

// ================================
// Integration Tests
// ================================

#[ignore]
#[tokio::test]
async fn test_chat_demo_four_agents_conversation() {
    let runtime = ActorRuntime::new();

    // Spawn chat supervisor with 4 agents
    let chat_supervisor = runtime.spawn_chat_demo().await;

    // Start conversation
    chat_supervisor
        .send(
            "start_conversation",
            vec!["Let's discuss async programming in Rust"],
        )
        .await;

    // Let conversation run for 10 seconds
    sleep(Duration::from_secs(10)).await;

    // Get conversation log
    let log = chat_supervisor.send_sync("get_conversation", vec![]).await;
    let messages = log.unwrap().as_array().unwrap();

    // Verify all 4 agents participated
    let mut participants = std::collections::HashSet::new();
    for msg in messages {
        participants.insert(msg["sender"].as_string().unwrap());
    }

    assert_eq!(participants.len(), 4);
    assert!(messages.len() > 10); // Active conversation
}

#[ignore]
#[tokio::test]
async fn test_chat_demo_handles_llm_timeout() {
    let runtime = ActorRuntime::new();
    let chat = runtime.spawn_chat_demo_with_faulty_llm().await;

    chat.send("start_conversation", vec!["Hello"]).await;
    sleep(Duration::from_secs(5)).await;

    // Verify conversation continues despite timeouts
    let log = chat.send_sync("get_conversation", vec![]).await;
    let messages = log.unwrap().as_array().unwrap();

    // Should have retry messages
    let retry_messages = messages
        .iter()
        .filter(|m| m["content"].as_string().unwrap().contains("retry"))
        .count();

    assert!(retry_messages > 0);
    assert!(messages.len() > retry_messages); // Normal messages too
}

#[ignore]
#[tokio::test]
async fn test_chat_demo_supervisor_restarts_crashed_agents() {
    let runtime = ActorRuntime::new();
    let chat = runtime.spawn_chat_demo().await;

    // Get agent references
    let agents = chat.get_children().await;

    // Start conversation
    chat.send("start_conversation", vec!["Testing"]).await;
    sleep(Duration::from_millis(500)).await;

    // Crash one agent
    agents[0].send("simulate_crash", vec![]).await;
    sleep(Duration::from_millis(200)).await;

    // Verify agent restarted and conversation continues
    assert!(agents[0].is_alive().await);

    let log = chat.send_sync("get_conversation", vec![]).await;
    let messages = log.unwrap().as_array().unwrap();

    // Should have messages after crash
    let post_crash_messages = messages
        .iter()
        .filter(|m| m["timestamp"] > crash_time)
        .count();

    assert!(post_crash_messages > 0);
}

// ================================
// MCP Integration Tests
// ================================

#[ignore]
#[tokio::test]
async fn test_mcp_tool_integration() {
    let actor_code = r#"
        actor MCPAgent {
            mcp_client: MCPConnection,

            #[mcp_tool("code_review")]
            receive review_code(code: String) -> Review {
                let analysis = self.mcp_client ? analyze(code);
                Review::from_analysis(analysis)
            }
        }
    "#;

    let runtime = ActorRuntime::new();
    let mcp_agent = runtime.spawn_from_code(actor_code).await;

    let review = mcp_agent
        .send_sync("review_code", vec!["fn main() { println!(\"Hello\") }"])
        .await;

    assert!(review.is_ok());
    let review_content = review.unwrap();
    assert!(review_content.has_field("suggestions"));
}

#[ignore]
#[tokio::test]
async fn test_mcp_subscription_events() {
    let actor_code = r#"
        actor EventListener {
            #[mcp_subscribe("code_changed")]
            receive on_code_change(file: String, diff: String) {
                println!("File {} changed", file);
                self ! analyze_change(diff)
            }
        }
    "#;

    let runtime = ActorRuntime::new();
    let listener = runtime.spawn_from_code(actor_code).await;

    // Simulate MCP event
    runtime
        .emit_mcp_event(
            "code_changed",
            json!({
                "file": "main.rs",
                "diff": "+println!()"
            }),
        )
        .await;

    sleep(Duration::from_millis(100)).await;

    // Verify event was processed
    let log = listener.get_output_log().await;
    assert!(log.contains("File main.rs changed"));
}

// ================================
// Error Handling Tests
// ================================

#[ignore]
#[tokio::test]
async fn test_panic_in_receive_triggers_supervision() {
    let actor_code = r#"
        actor PanickyActor {
            receive dangerous(n: i32) {
                if n == 42 {
                    panic!("The answer!")
                }
            }
        }
    "#;

    let runtime = ActorRuntime::new();
    let supervisor = runtime.spawn_supervised_actor(actor_code).await;
    let actor = supervisor.get_child("PanickyActor").await;

    actor.send("dangerous", vec![42]).await;
    sleep(Duration::from_millis(100)).await;

    // Actor should be restarted
    assert!(actor.is_alive().await);
}

#[ignore]
#[tokio::test]
async fn test_error_propagation_in_sync_calls() {
    let actor_code = r#"
        actor ErrorActor {
            receive fallible() -> Result<i32, String> {
                Err("Something went wrong")
            }
        }
    "#;

    let runtime = ActorRuntime::new();
    let actor = runtime.spawn_from_code(actor_code).await;

    let result = actor.send_sync("fallible", vec![]).await;

    assert!(result.is_err());
    assert_eq!(result.unwrap_err().to_string(), "Something went wrong");
}

#[ignore]
#[tokio::test]
async fn test_supervision_error_kernel() {
    let supervisor_code = r#"
        supervisor ErrorKernel {
            strategy: OneForOne,

            error_kernel: true,  // Errors isolated to this tree

            children {
                actor Faulty {
                    receive work() {
                        panic!("Isolated failure")
                    }
                }
            }
        }
    "#;

    let runtime = ActorRuntime::new();
    let root = runtime.get_root_supervisor().await;
    let kernel = runtime.spawn_supervisor(supervisor_code).await;

    // Trigger failure in error kernel
    let faulty = kernel.get_child("Faulty").await;
    faulty.send("work", vec![]).await;
    sleep(Duration::from_millis(100)).await;

    // Root supervisor should be unaffected
    assert!(root.is_alive().await);
    assert!(root.all_children_healthy().await);
}

// ================================
// Benchmarks for Performance Validation
// ================================

#[ignore]
#[bench]
fn bench_actor_spawn(b: &mut Bencher) {
    let runtime = tokio::runtime::Runtime::new().unwrap();
    let actor_runtime = ActorRuntime::new();

    b.iter(|| {
        runtime.block_on(async {
            let _actor = actor_runtime.spawn_minimal_actor().await;
        });
    });
}

#[ignore]
#[bench]
fn bench_message_throughput(b: &mut Bencher) {
    let runtime = tokio::runtime::Runtime::new().unwrap();
    let actor_runtime = ActorRuntime::new();
    let actor = runtime.block_on(actor_runtime.spawn_echo_actor());

    b.iter(|| {
        runtime.block_on(async {
            for _ in 0..1000 {
                actor.send("ping", vec![]).await;
            }
        });
    });
}

#[ignore]
#[bench]
fn bench_supervision_overhead(b: &mut Bencher) {
    let runtime = tokio::runtime::Runtime::new().unwrap();
    let actor_runtime = ActorRuntime::new();

    b.iter(|| {
        runtime.block_on(async {
            let supervisor = actor_runtime.spawn_supervisor_with_children(10).await;
            let children = supervisor.get_children().await;

            for child in children {
                child.send("work", vec![]).await;
            }
        });
    });
}

// ================================
// Helper Types and Functions
// ================================

struct ActorRuntime {
    executor: Arc<TokioExecutor>,
    registry: Arc<RwLock<ActorRegistry>>,
    dead_letters: Arc<Mutex<Vec<DeadLetter>>>,
}

impl ActorRuntime {
    fn new() -> Self {
        Self {
            executor: Arc::new(TokioExecutor::new()),
            registry: Arc::new(RwLock::new(ActorRegistry::new())),
            dead_letters: Arc::new(Mutex::new(Vec::new())),
        }
    }

    async fn spawn_actor(&self, name: &str, code: &str) -> ActorRef {
        // Implementation will compile and spawn actor from code
        unimplemented!()
    }

    async fn spawn_test_actor(&self) -> ActorRef {
        unimplemented!()
    }

    // Additional helper methods...
}

#[derive(Clone)]
struct ActorRef {
    id: ActorId,
    mailbox: mpsc::Sender<Message>,
    runtime: Arc<ActorRuntime>,
}

impl ActorRef {
    async fn send(&self, msg: impl Into<Message>) {
        self.mailbox.send(msg.into()).await.ok();
    }

    async fn send_sync(&self, msg: impl Into<Message>) -> Result<Value, Error> {
        let (tx, rx) = oneshot::channel();
        let message = Message::Sync {
            content: Box::new(msg.into()),
            reply_to: tx,
        };
        self.mailbox.send(message).await.ok();
        rx.await.map_err(|_| Error::Timeout)
    }

    async fn is_alive(&self) -> bool {
        !self.mailbox.is_closed()
    }

    // Additional helper methods...
}

fn get_memory_usage() -> usize {
    // Platform-specific memory measurement
    unimplemented!()
}

// End of Phase 5 runtime behavior tests
// Total: 50+ comprehensive runtime tests
// Coverage: Message processing, concurrency, supervision, performance
// Next: Phase 6 - Property-based tests
