//! Integration tests for LocalBridge over Unix sockets (D-030 Layer 2: IPC roundtrip).

use settled_reach_server::bridge::framing::{read_framed, write_framed};
use settled_reach_server::bridge::local::LocalBridge;
use settled_reach_server::bridge::types::*;
use settled_reach_server::bridge::SimBridge;
use settled_reach_server::simulation::time::{DayPhase, TickRate};
use std::os::unix::net::UnixStream;
use std::path::PathBuf;
use std::thread;
use std::time::Duration;

/// Generate unique socket path for test isolation
fn test_socket_path(test_name: &str) -> PathBuf {
    let pid = std::process::id();
    let timestamp = std::time::SystemTime::now()
        .duration_since(std::time::UNIX_EPOCH)
        .unwrap()
        .as_millis();
    PathBuf::from(format!(
        "/tmp/sr-test-{}-{}-{}.sock",
        test_name, pid, timestamp
    ))
}

#[test]
fn snapshot_roundtrip_over_unix_socket() {
    let socket_path = test_socket_path("snapshot");

    // Server thread: accept connection and send snapshot
    let server_path = socket_path.clone();
    let server_handle = thread::spawn(move || {
        let bridge = LocalBridge::accept(&server_path).expect("failed to accept");

        let snapshot = ObserverSnapshot {
            version: PROTOCOL_VERSION,
            tick: 42,
            game_time: GameTime {
                day: 0,
                time_of_day: 0,
                day_phase: DayPhase::Morning,
                tick_rate: TickRate::Full,
            },
            player_facing: FacingDirection::North,
            player_stance: MovementStance::default(),
            player_inventory: vec![],
            entities: vec![VisibleEntity {
                entity_id: 100,
                x: 10.5,
                y: 20.3,
                z: 0,
                kind: EntityKind::Npc,
                visibility: VisibilitySector::Forward,
                relationship: RelationshipState::Unknown,
                observation: EntityVisibility::Visible,
                tell_state: None,
            }],
            visible_tiles: vec![],
            nearby_interactions: vec![],
            current_monologue: None,
            pending_recognitions: vec![],
            dialogue_response: None,
            blocked_entities: vec![],
            scan_events: vec![],
            sound_events: vec![],
            conversation_events: vec![],
            conversation_ended: vec![],
            follow_state: None,
            character_pressure: None,
            rng_seed: None,
            poi_list: vec![],
            examine_result: None,
            player_knowledge: None,
            save_result: None,
            triangle_crisis_events: vec![],
            state_hash: None,
            debug_response: None,
            sim_errors: vec![],
            current_ticker: None,
            settings_response: None,
        };

        bridge
            .send_snapshot(&snapshot)
            .expect("failed to send snapshot");
    });

    // Give server time to bind
    thread::sleep(Duration::from_millis(50));

    // Client: connect and receive snapshot
    let stream = UnixStream::connect(&socket_path).expect("failed to connect");
    let mut reader = std::io::BufReader::new(stream);

    let payload = read_framed(&mut reader)
        .expect("failed to read frame")
        .expect("unexpected EOF");

    let snapshot: ObserverSnapshot =
        rmp_serde::from_slice(&payload).expect("failed to deserialize");

    assert_eq!(snapshot.tick, 42);
    assert_eq!(snapshot.entities.len(), 1);
    assert_eq!(snapshot.entities[0].entity_id, 100);
    assert_eq!(snapshot.entities[0].x, 10.5);
    assert_eq!(snapshot.entities[0].y, 20.3);

    server_handle.join().expect("server thread panicked");
}

#[test]
fn input_roundtrip_over_unix_socket() {
    let socket_path = test_socket_path("input");

    // Server thread: accept connection and receive inputs
    let server_path = socket_path.clone();
    let server_handle = thread::spawn(move || {
        let bridge = LocalBridge::accept(&server_path).expect("failed to accept");

        let inputs = bridge.receive_inputs().expect("failed to receive inputs");

        assert_eq!(inputs.len(), 2);
        assert_eq!(inputs[0].tick, 10);
        assert_eq!(inputs[1].tick, 11);

        inputs
    });

    // Give server time to bind
    thread::sleep(Duration::from_millis(50));

    // Client: connect and send inputs
    let stream = UnixStream::connect(&socket_path).expect("failed to connect");
    let mut writer = std::io::BufWriter::new(stream);

    let inputs = vec![
        PlayerInput {
            tick: 10,
            action: PlayerAction::MoveNorth,
        },
        PlayerInput {
            tick: 11,
            action: PlayerAction::Interact {
                target_entity_id: None,
                verb: None,
            },
        },
    ];

    let payload = rmp_serde::to_vec_named(&inputs).expect("failed to serialize");
    write_framed(&mut writer, &payload).expect("failed to write frame");

    // Drop writer to close connection and signal EOF to server
    drop(writer);

    let received_inputs = server_handle.join().expect("server thread panicked");

    // Verify actions survived the round-trip
    match &received_inputs[0].action {
        PlayerAction::MoveNorth => {}
        _ => panic!("expected MoveNorth action"),
    }
    match &received_inputs[1].action {
        PlayerAction::Interact { .. } => {}
        _ => panic!("expected Interact action"),
    }
}