// mind/ — Cognitive layer
//
// Session state machine, DMN, identity, observation socket.
// Everything about how the mind operates, separate from the
// user interface (TUI, CLI) and the agent execution (tools, API).

pub mod dmn;
pub mod identity;
pub mod observe;

// consciousness.rs — Session state machine and event loop
//
// The core runtime for the consciousness binary. Session manages turns,
// DMN state, compaction, scoring, and slash commands. The event loop
// bridges Session (cognitive state) with App (TUI rendering).
//
// The event loop uses biased select! so priorities are deterministic:
// keyboard events > turn results > render ticks > DMN timer > UI messages.

use anyhow::Result;
use crossterm::event::{Event, EventStream, KeyEventKind};
use futures::StreamExt;
use std::sync::Arc;
use std::time::{Duration, Instant};
use tokio::sync::{mpsc, Mutex};

use crate::agent::{Agent, TurnResult};
use crate::agent::api::ApiClient;
use crate::agent::api::types as api_types;
use crate::config::{self, AppConfig, SessionConfig};
use crate::user::{self as tui, HotkeyAction};
use crate::user::ui_channel::{self, ContextInfo, StatusInfo, StreamTarget, UiMessage};
use crate::user::log;

/// Compaction threshold — context is rebuilt when prompt tokens exceed this.
fn compaction_threshold(app: &AppConfig) -> u32 {
    (crate::agent::context::context_window() as u32) * app.compaction.hard_threshold_pct / 100
}

/// Commands that are handled in the main loop, not sent to the agent.
enum Command {
    Quit,
    Handled,
    None,
}

// --- Session: all mutable state for a running agent session ---

/// Collects the ~15 loose variables that previously lived in run()
/// into a coherent struct with methods. The event loop dispatches
/// to Session methods; Session manages turns, compaction, DMN state,
/// and slash commands.
pub struct Session {
    agent: Arc<Mutex<Agent>>,
    config: SessionConfig,
    ui_tx: ui_channel::UiSender,
    turn_tx: mpsc::Sender<(Result<TurnResult>, StreamTarget)>,
    // DMN state
    dmn: dmn::State,
    dmn_turns: u32,
    max_dmn_turns: u32,

    // Turn tracking
    turn_in_progress: bool,
    turn_handle: Option<tokio::task::JoinHandle<()>>,
    /// User messages received while a turn is in progress.
    /// Consolidated into one message (newline-separated) so the
    /// model sees everything the user typed, not just the first line.
    pending_input: Option<String>,

    // Per-turn tracking for DMN context
    last_user_input: Instant,
    consecutive_errors: u32,
    last_turn_had_tools: bool,

    // Subconscious orchestration
    agent_cycles: crate::subconscious::subconscious::AgentCycleState,
    /// Latest memory importance scores from full matrix scoring (manual /score).
    memory_scores: Option<crate::agent::training::MemoryScore>,
    /// Whether a full matrix /score task is currently running.
    scoring_in_flight: bool,
}

impl Session {
    fn new(
        agent: Arc<Mutex<Agent>>,
        config: SessionConfig,
        ui_tx: ui_channel::UiSender,
        turn_tx: mpsc::Sender<(Result<TurnResult>, StreamTarget)>,
    ) -> Self {
        let max_dmn_turns = config.app.dmn.max_turns;

        Self {
            agent,
            config,
            ui_tx,
            turn_tx,
            dmn: if dmn::is_off() {
                dmn::State::Off
            } else {
                dmn::State::Resting { since: Instant::now() }
            },
            dmn_turns: 0,
            max_dmn_turns,
            turn_in_progress: false,
            turn_handle: None,
            pending_input: None,
            last_user_input: Instant::now(),
            consecutive_errors: 0,
            last_turn_had_tools: false,
            agent_cycles: crate::subconscious::subconscious::AgentCycleState::new(""),
            memory_scores: None,
            scoring_in_flight: false,
        }
    }

    /// How long before the next DMN tick.
    fn dmn_interval(&self) -> Duration {
        self.dmn.interval()
    }

    /// Spawn an agent turn in a background task.
    fn spawn_turn(&mut self, input: String, target: StreamTarget) {
        let agent = self.agent.clone();
        let ui_tx = self.ui_tx.clone();
        let result_tx = self.turn_tx.clone();
        self.turn_in_progress = true;
        self.turn_handle = Some(tokio::spawn(async move {
            let result = Agent::turn(agent, &input, &ui_tx, target).await;
            let _ = result_tx.send((result, target)).await;
        }));
    }

    /// Submit user input — either queue it (if a turn is running) or
    /// start a new turn immediately.
    fn submit_input(&mut self, input: String) {
        if self.turn_in_progress {
            match &mut self.pending_input {
                Some(existing) => {
                    existing.push('\n');
                    existing.push_str(&input);
                }
                None => self.pending_input = Some(input.clone()),
            }
            let _ = self.ui_tx.send(UiMessage::Info("(queued)".into()));
        } else {
            self.dmn_turns = 0;
            self.consecutive_errors = 0;
            self.last_user_input = Instant::now();
            self.dmn = dmn::State::Engaged;
            let _ = self.ui_tx.send(UiMessage::UserInput(input.clone()));
            self.update_status();
            self.spawn_turn(input, StreamTarget::Conversation);
        }
    }

    /// Process a completed turn: update DMN state, check compaction,
    /// drain any queued input.
    async fn handle_turn_result(
        &mut self,
        result: Result<TurnResult>,
        target: StreamTarget,
    ) {
        self.turn_in_progress = false;
        self.turn_handle = None;

        match result {
            Ok(turn_result) => {
                if turn_result.tool_errors > 0 {
                    self.consecutive_errors += turn_result.tool_errors;
                } else {
                    self.consecutive_errors = 0;
                }
                self.last_turn_had_tools = turn_result.had_tool_calls;
                self.dmn = dmn::transition(
                    &self.dmn,
                    turn_result.yield_requested,
                    turn_result.had_tool_calls,
                    target == StreamTarget::Conversation,
                );
                if turn_result.dmn_pause {
                    self.dmn = dmn::State::Paused;
                    self.dmn_turns = 0;
                    let _ = self.ui_tx.send(UiMessage::Info(
                        "DMN paused (agent requested). Ctrl+P or /wake to resume.".into(),
                    ));
                }
                if let Some(model_name) = turn_result.model_switch {
                    self.switch_model(&model_name).await;
                }
            }
            Err(e) => {
                self.consecutive_errors += 1;
                let msg = match target {
                    StreamTarget::Autonomous => {
                        UiMessage::DmnAnnotation(format!("[error: {:#}]", e))
                    }
                    StreamTarget::Conversation => {
                        UiMessage::Info(format!("Error: {:#}", e))
                    }
                };
                let _ = self.ui_tx.send(msg);
                self.dmn = dmn::State::Resting {
                    since: Instant::now(),
                };
            }
        }

        self.update_status();
        self.check_compaction();
        if !self.config.no_agents {
            self.start_memory_scoring();
        }
        self.drain_pending();
    }

    /// Spawn incremental memory scoring if not already running.
    /// Non-blocking — all async work happens in the spawned task.
    fn start_memory_scoring(&self) {
        let agent = self.agent.clone();
        let ui_tx = self.ui_tx.clone();
        let cfg = crate::config::get();
        let max_age = cfg.scoring_interval_secs;
        let response_window = cfg.scoring_response_window;
        tokio::spawn(async move {
            let (context, client) = {
                let mut agent = agent.lock().await;
                if agent.agent_cycles.memory_scoring_in_flight {
                    return;
                }
                agent.agent_cycles.memory_scoring_in_flight = true;
                let _ = ui_tx.send(UiMessage::AgentUpdate(agent.agent_cycles.snapshots()));
                (agent.context.clone(), agent.client_clone())
            };

            let result = crate::agent::training::score_memories_incremental(
                &context, max_age as i64, response_window, &client, &ui_tx,
            ).await;

            {
                let mut agent = agent.lock().await;
                agent.agent_cycles.memory_scoring_in_flight = false;
                if let Ok(ref scores) = result {
                    agent.agent_cycles.memory_scores = scores.clone();
                }
            }
            match result {
                Ok(_) => {
                    let agent = agent.lock().await;
                    let _ = ui_tx.send(UiMessage::AgentUpdate(agent.agent_cycles.snapshots()));
                }
                Err(e) => {
                    let _ = ui_tx.send(UiMessage::Debug(format!(
                        "[memory-scoring] failed: {:#}", e,
                    )));
                }
            }
        });
    }

    /// Check if compaction is needed after a turn.
    fn check_compaction(&self) {
        let threshold = compaction_threshold(&self.config.app);
        let agent = self.agent.clone();
        let ui_tx = self.ui_tx.clone();
        tokio::spawn(async move {
            let mut agent_guard = agent.lock().await;
            let tokens = agent_guard.last_prompt_tokens();
            if tokens > threshold {
                let _ = ui_tx.send(UiMessage::Info(format!(
                    "[compaction: {}K > {}K threshold]",
                    tokens / 1000,
                    threshold / 1000,
                )));
                agent_guard.compact();
                let _ = ui_tx.send(UiMessage::Info(
                    "[compacted — journal + recent messages]".into(),
                ));
            }
        });
    }

    /// Send any consolidated pending input as a single turn.
    fn drain_pending(&mut self) {
        if let Some(queued) = self.pending_input.take() {
            self.dmn_turns = 0;
            self.consecutive_errors = 0;
            self.last_user_input = Instant::now();
            self.dmn = dmn::State::Engaged;
            let _ = self.ui_tx.send(UiMessage::UserInput(queued.clone()));
            self.update_status();
            self.spawn_turn(queued, StreamTarget::Conversation);
        }
    }

    /// Fire a DMN tick: check max turns, generate prompt, spawn turn.
    fn dmn_tick(&mut self) {
        if matches!(self.dmn, dmn::State::Paused | dmn::State::Off) {
            return;
        }

        self.dmn_turns += 1;
        if self.dmn_turns > self.max_dmn_turns {
            let _ = self.ui_tx.send(UiMessage::DmnAnnotation(format!(
                "[dmn: {} consecutive turns, resting (limit: {})]",
                self.dmn_turns - 1,
                self.max_dmn_turns,
            )));
            self.dmn = dmn::State::Resting {
                since: Instant::now(),
            };
            self.dmn_turns = 0;
            self.update_status();
            return;
        }

        let dmn_ctx = dmn::DmnContext {
            user_idle: self.last_user_input.elapsed(),
            consecutive_errors: self.consecutive_errors,
            last_turn_had_tools: self.last_turn_had_tools,
        };
        let prompt = self.dmn.prompt(&dmn_ctx);
        let _ = self.ui_tx.send(UiMessage::DmnAnnotation(format!(
            "[dmn: {} ({}/{})]",
            self.dmn.label(),
            self.dmn_turns,
            self.max_dmn_turns,
        )));
        self.update_status();
        self.spawn_turn(prompt, StreamTarget::Autonomous);
    }

    /// Handle slash commands. Returns how the main loop should respond.
    async fn handle_command(&mut self, input: &str) -> Command {
        const COMMANDS: &[(&str, &str)] = &[
            ("/quit",    "Exit consciousness"),
            ("/new",     "Start fresh session (saves current)"),
            ("/save",    "Save session to disk"),
            ("/retry",   "Re-run last turn"),
            ("/model",   "Show/switch model (/model <name>)"),
            ("/score",   "Score memory importance"),
            ("/dmn",     "Show DMN state"),
            ("/sleep",   "Put DMN to sleep"),
            ("/wake",    "Wake DMN to foraging"),
            ("/pause",   "Full stop — no autonomous ticks (Ctrl+P)"),
            ("/test",    "Run tool smoke tests"),
            ("/help",    "Show this help"),
        ];

        match input {
            "/quit" | "/exit" => Command::Quit,
            "/save" => {
                let _ = self.ui_tx.send(UiMessage::Info(
                    "Conversation is saved automatically (append-only log).".into()
                ));
                Command::Handled
            }
            "/new" | "/clear" => {
                if self.turn_in_progress {
                    let _ = self.ui_tx.send(UiMessage::Info("(turn in progress, please wait)".into()));
                    return Command::Handled;
                }
                {
                    let new_log = log::ConversationLog::new(
                        self.config.session_dir.join("conversation.jsonl"),
                    ).ok();
                    let mut agent_guard = self.agent.lock().await;
                    let shared_ctx = agent_guard.shared_context.clone();
                    let shared_tools = agent_guard.active_tools.clone();
                    *agent_guard = Agent::new(
                        ApiClient::new(&self.config.api_base, &self.config.api_key, &self.config.model),
                        self.config.system_prompt.clone(),
                        self.config.context_parts.clone(),
                        self.config.app.clone(),
                        self.config.prompt_file.clone(),
                        new_log,
                        shared_ctx,
                        shared_tools,
                    );
                }
                self.dmn = dmn::State::Resting { since: Instant::now() };
                let _ = self.ui_tx.send(UiMessage::Info("New session started.".into()));
                Command::Handled
            }
            "/model" => {
                if let Ok(agent) = self.agent.try_lock() {
                    let _ = self.ui_tx.send(UiMessage::Info(format!("Current model: {}", agent.model())));
                    let names = self.config.app.model_names();
                    if !names.is_empty() {
                        let _ = self.ui_tx.send(UiMessage::Info(format!("Available: {}", names.join(", "))));
                    }
                } else {
                    let _ = self.ui_tx.send(UiMessage::Info("(busy)".into()));
                }
                Command::Handled
            }
            "/score" => {
                if self.scoring_in_flight {
                    let _ = self.ui_tx.send(UiMessage::Info("(scoring already in progress)".into()));
                    return Command::Handled;
                }
                let (context, client) = {
                    let agent = self.agent.lock().await;
                    (agent.context.clone(), agent.client_clone())
                };
                self.scoring_in_flight = true;
                let agent = self.agent.clone();
                let ui_tx = self.ui_tx.clone();
                tokio::spawn(async move {
                    let result = crate::agent::training::score_memories(
                        &context, &client, &ui_tx,
                    ).await;
                    let agent = agent.lock().await;
                    match result {
                        Ok(scores) => {
                            agent.publish_context_state_with_scores(Some(&scores));
                        }
                        Err(e) => {
                            let _ = ui_tx.send(UiMessage::Info(format!("[scoring failed: {:#}]", e)));
                        }
                    }
                });
                Command::Handled
            }
            "/dmn" => {
                let _ = self.ui_tx.send(UiMessage::Info(format!("DMN state: {:?}", self.dmn)));
                let _ = self.ui_tx.send(UiMessage::Info(format!("Next tick in: {:?}", self.dmn.interval())));
                let _ = self.ui_tx.send(UiMessage::Info(format!(
                    "Consecutive DMN turns: {}/{}", self.dmn_turns, self.max_dmn_turns,
                )));
                Command::Handled
            }
            "/sleep" => {
                self.dmn = dmn::State::Resting { since: Instant::now() };
                self.dmn_turns = 0;
                let _ = self.ui_tx.send(UiMessage::Info(
                    "DMN sleeping (heartbeat every 5 min). Type anything to wake.".into(),
                ));
                Command::Handled
            }
            "/wake" => {
                let was_paused = matches!(self.dmn, dmn::State::Paused | dmn::State::Off);
                if matches!(self.dmn, dmn::State::Off) {
                    dmn::set_off(false);
                }
                self.dmn = dmn::State::Foraging;
                self.dmn_turns = 0;
                let msg = if was_paused { "DMN unpaused — entering foraging mode." }
                    else { "DMN waking — entering foraging mode." };
                let _ = self.ui_tx.send(UiMessage::Info(msg.into()));
                self.update_status();
                Command::Handled
            }
            "/pause" => {
                self.dmn = dmn::State::Paused;
                self.dmn_turns = 0;
                let _ = self.ui_tx.send(UiMessage::Info(
                    "DMN paused — no autonomous ticks. Ctrl+P or /wake to resume.".into(),
                ));
                self.update_status();
                Command::Handled
            }
            "/retry" => {
                if self.turn_in_progress {
                    let _ = self.ui_tx.send(UiMessage::Info("(turn in progress, please wait)".into()));
                    return Command::Handled;
                }
                let mut agent_guard = self.agent.lock().await;
                let entries = agent_guard.entries_mut();
                let mut last_user_text = None;
                while let Some(entry) = entries.last() {
                    if entry.message().role == api_types::Role::User {
                        last_user_text = Some(entries.pop().unwrap().message().content_text().to_string());
                        break;
                    }
                    entries.pop();
                }
                drop(agent_guard);
                match last_user_text {
                    Some(text) => {
                        let preview_len = text.len().min(60);
                        let _ = self.ui_tx.send(UiMessage::Info(format!("(retrying: {}...)", &text[..preview_len])));
                        self.dmn_turns = 0;
                        self.dmn = dmn::State::Engaged;
                        self.spawn_turn(text, StreamTarget::Conversation);
                    }
                    None => {
                        let _ = self.ui_tx.send(UiMessage::Info("(nothing to retry)".into()));
                    }
                }
                Command::Handled
            }
            "/help" => {
                for (name, desc) in COMMANDS {
                    let _ = self.ui_tx.send(UiMessage::Info(format!("  {:12} {}", name, desc)));
                }
                let _ = self.ui_tx.send(UiMessage::Info(String::new()));
                let _ = self.ui_tx.send(UiMessage::Info(
                    "Keys: Tab=pane  ^Up/Down=scroll  PgUp/PgDn=scroll  Mouse=click/scroll".into(),
                ));
                let _ = self.ui_tx.send(UiMessage::Info(
                    "      Alt+Enter=newline  Esc=interrupt  ^P=pause  ^R=reasoning  ^K=kill  F10=context  F2=agents".into(),
                ));
                let _ = self.ui_tx.send(UiMessage::Info(
                    "      Shift+click for native text selection (copy/paste)".into(),
                ));
                Command::Handled
            }
            cmd if cmd.starts_with("/model ") => {
                let name = cmd[7..].trim();
                if name.is_empty() {
                    let _ = self.ui_tx.send(UiMessage::Info("Usage: /model <name>".into()));
                    return Command::Handled;
                }
                self.switch_model(name).await;
                Command::Handled
            }
            _ => Command::None,
        }
    }

    /// Interrupt: kill processes, abort current turn, clear pending queue.
    async fn interrupt(&mut self) {
        let count = {
            let agent = self.agent.lock().await;
            let mut tools = agent.active_tools.lock().unwrap();
            let count = tools.len();
            for entry in tools.drain(..) {
                entry.handle.abort();
            }
            count
        };
        if count == 0 {
            if let Some(handle) = self.turn_handle.take() {
                handle.abort();
                self.turn_in_progress = false;
                self.dmn = dmn::State::Resting { since: Instant::now() };
                self.update_status();
                let _ = self.ui_tx.send(UiMessage::Activity(String::new()));
            }
        }
        self.pending_input = None;
        let killed = count;
        if killed > 0 || self.turn_in_progress {
            let _ = self.ui_tx.send(UiMessage::Info(format!(
                "(interrupted — killed {} process(es), turn aborted)", killed,
            )));
        } else {
            let _ = self.ui_tx.send(UiMessage::Info("(interrupted)".into()));
        }
    }

    /// Cycle reasoning effort: none → low → high → none.
    fn cycle_reasoning(&mut self, app: &mut tui::App) {
        if let Ok(mut agent_guard) = self.agent.try_lock() {
            let next = match agent_guard.reasoning_effort.as_str() {
                "none" => "low",
                "low" => "high",
                _ => "none",
            };
            agent_guard.reasoning_effort = next.to_string();
            app.reasoning_effort = next.to_string();
            let label = match next {
                "none" => "off (monologue hidden)",
                "low" => "low (brief monologue)",
                "high" => "high (full monologue)",
                _ => next,
            };
            let _ = self.ui_tx.send(UiMessage::Info(format!("Reasoning: {} — ^R to cycle", label)));
        } else {
            let _ = self.ui_tx.send(UiMessage::Info(
                "(agent busy — reasoning change takes effect next turn)".into(),
            ));
        }
    }

    /// Show and kill running tool calls (Ctrl+K).
    async fn kill_processes(&mut self) {
        let active_tools = self.agent.lock().await.active_tools.clone();
        let mut tools = active_tools.lock().unwrap();
        if tools.is_empty() {
            let _ = self.ui_tx.send(UiMessage::Info("(no running tool calls)".into()));
        } else {
            for entry in tools.drain(..) {
                let elapsed = entry.started.elapsed();
                let _ = self.ui_tx.send(UiMessage::Info(format!(
                    "  killing {} ({:.0}s): {}", entry.name, elapsed.as_secs_f64(), entry.detail,
                )));
                entry.handle.abort();
            }
        }
    }

    /// Cycle DMN autonomy: foraging → resting → paused → off → foraging.
    fn cycle_autonomy(&mut self) {
        let (new_state, label) = match &self.dmn {
            dmn::State::Engaged | dmn::State::Working | dmn::State::Foraging => {
                (dmn::State::Resting { since: Instant::now() }, "resting")
            }
            dmn::State::Resting { .. } => (dmn::State::Paused, "PAUSED"),
            dmn::State::Paused => {
                dmn::set_off(true);
                (dmn::State::Off, "OFF (persists across restarts)")
            }
            dmn::State::Off => {
                dmn::set_off(false);
                (dmn::State::Foraging, "foraging")
            }
        };
        self.dmn = new_state;
        self.dmn_turns = 0;
        let _ = self.ui_tx.send(UiMessage::Info(format!("DMN → {} (Ctrl+P to cycle)", label)));
        self.update_status();
    }

    /// Switch to a named model from the config registry.
    async fn switch_model(&mut self, name: &str) {
        if self.turn_in_progress {
            let _ = self.ui_tx.send(UiMessage::Info("(turn in progress, please wait)".into()));
            return;
        }

        let resolved = match self.config.app.resolve_model(name) {
            Ok(r) => r,
            Err(e) => {
                let _ = self.ui_tx.send(UiMessage::Info(format!("{}", e)));
                return;
            }
        };

        let new_client = ApiClient::new(&resolved.api_base, &resolved.api_key, &resolved.model_id);

        let prompt_changed = resolved.prompt_file != self.config.prompt_file;
        let mut agent_guard = self.agent.lock().await;
        agent_guard.swap_client(new_client);

        self.config.model = resolved.model_id.clone();
        self.config.api_base = resolved.api_base;
        self.config.api_key = resolved.api_key;

        if prompt_changed {
            self.config.prompt_file = resolved.prompt_file.clone();
            agent_guard.prompt_file = resolved.prompt_file.clone();
            agent_guard.compact();
            let _ = self.ui_tx.send(UiMessage::Info(format!(
                "Switched to {} ({}) — prompt: {}, recompacted",
                name, resolved.model_id, resolved.prompt_file,
            )));
        } else {
            let _ = self.ui_tx.send(UiMessage::Info(format!(
                "Switched to {} ({})", name, resolved.model_id,
            )));
        }

        drop(agent_guard);
        self.update_status();
        self.send_context_info();
    }

    fn load_context_groups(&self) -> Vec<config::ContextGroup> {
        config::get().context_groups.clone()
    }

    fn send_context_info(&self) {
        let context_groups = self.load_context_groups();
        let (instruction_files, memory_files) = identity::context_file_info(
            &self.config.prompt_file,
            self.config.app.memory_project.as_deref(),
            &context_groups,
        );
        let _ = self.ui_tx.send(UiMessage::ContextInfoUpdate(ContextInfo {
            model: self.config.model.clone(),
            available_models: self.config.app.model_names(),
            prompt_file: self.config.prompt_file.clone(),
            backend: self.config.app.backend.clone(),
            instruction_files,
            memory_files,
            system_prompt_chars: self.config.system_prompt.len(),
            context_message_chars: self.config.context_parts.iter().map(|(_, c)| c.len()).sum(),
        }));
    }

    fn update_status(&self) {
        let _ = self.ui_tx.send(UiMessage::StatusUpdate(StatusInfo {
            dmn_state: self.dmn.label().to_string(),
            dmn_turns: self.dmn_turns,
            dmn_max_turns: self.max_dmn_turns,
            prompt_tokens: 0,
            completion_tokens: 0,
            model: String::new(),
            turn_tools: 0,
            context_budget: String::new(),
        }));
    }

    async fn shutdown(&mut self) {
        if let Some(handle) = self.turn_handle.take() {
            handle.abort();
        }
    }
}

// --- Event loop ---

pub async fn run(cli: crate::user::CliArgs) -> Result<()> {
    let (config, _figment) = config::load_session(&cli)?;

    if config.app.debug {
        unsafe { std::env::set_var("POC_DEBUG", "1") };
    }

    // Start channel daemons
    let mut channel_supervisor = crate::thalamus::supervisor::Supervisor::new();
    channel_supervisor.load_config();
    channel_supervisor.ensure_running();

    // Initialize idle state machine
    let mut idle_state = crate::thalamus::idle::State::new();
    idle_state.load();

    // Channel status fetcher
    let (channel_tx, mut channel_rx) = tokio::sync::mpsc::channel::<Vec<(String, bool, u32)>>(4);
    {
        let tx = channel_tx.clone();
        tokio::spawn(async move {
            let result = crate::thalamus::channels::fetch_all_channels().await;
            let _ = tx.send(result).await;
        });
    }

    let notify_rx = crate::thalamus::channels::subscribe_all();
    let mut pending_notifications: Vec<crate::thalamus::channels::ChannelNotification> = Vec::new();

    // Create UI channel
    let (ui_tx, mut ui_rx) = ui_channel::channel();

    // Shared state
    let shared_context = ui_channel::shared_context_state();
    let shared_active_tools = ui_channel::shared_active_tools();

    // Initialize TUI
    let mut terminal = tui::init_terminal()?;
    let mut app = tui::App::new(config.model.clone(), shared_context.clone(), shared_active_tools.clone());

    // Startup info
    let _ = ui_tx.send(UiMessage::Info("consciousness v0.3 (tui)".into()));
    let _ = ui_tx.send(UiMessage::Info(format!(
        "  model: {} (available: {})", config.model, config.app.model_names().join(", "),
    )));
    let client = ApiClient::new(&config.api_base, &config.api_key, &config.model);
    let _ = ui_tx.send(UiMessage::Info(format!("  api:   {} ({})", config.api_base, client.backend_label())));
    let _ = ui_tx.send(UiMessage::Info(format!(
        "  context: {}K chars ({} config, {} memory files)",
        config.context_parts.iter().map(|(_, c)| c.len()).sum::<usize>() / 1024,
        config.config_file_count, config.memory_file_count,
    )));

    let conversation_log_path = config.session_dir.join("conversation.jsonl");
    let conversation_log = log::ConversationLog::new(conversation_log_path.clone())
        .expect("failed to create conversation log");
    let _ = ui_tx.send(UiMessage::Info(format!("  log:   {}", conversation_log.path().display())));

    let agent = Arc::new(Mutex::new(Agent::new(
        client,
        config.system_prompt.clone(),
        config.context_parts.clone(),
        config.app.clone(),
        config.prompt_file.clone(),
        Some(conversation_log),
        shared_context,
        shared_active_tools,
    )));

    // Restore conversation from log
    {
        let mut agent_guard = agent.lock().await;
        if agent_guard.restore_from_log() {
            ui_channel::replay_session_to_ui(agent_guard.entries(), &ui_tx);
            let _ = ui_tx.send(UiMessage::Info("--- restored from conversation log ---".into()));
        }
    }

    // Send initial budget to status bar
    {
        let agent_guard = agent.lock().await;
        let _ = ui_tx.send(UiMessage::StatusUpdate(StatusInfo {
            dmn_state: "resting".to_string(),
            dmn_turns: 0, dmn_max_turns: 0,
            prompt_tokens: 0, completion_tokens: 0,
            model: agent_guard.model().to_string(),
            turn_tools: 0,
            context_budget: agent_guard.budget().status_string(),
        }));
    }

    let (turn_tx, mut turn_rx) = mpsc::channel::<(Result<TurnResult>, StreamTarget)>(1);

    let no_agents = config.no_agents;
    let mut session = Session::new(agent, config, ui_tx.clone(), turn_tx);
    session.update_status();
    if !no_agents {
        session.start_memory_scoring(); // also sends initial agent snapshots
    }
    session.send_context_info();

    // Start observation socket
    let socket_path = session.config.session_dir.join("agent.sock");
    let (observe_input_tx, mut observe_input_rx) = observe::input_channel();
    if !no_agents {
        observe::start(socket_path, ui_tx.subscribe(), observe_input_tx);
    }

    let mut reader = EventStream::new();

    let mut render_interval = tokio::time::interval(Duration::from_millis(50));
    render_interval.set_missed_tick_behavior(tokio::time::MissedTickBehavior::Skip);
    let mut dirty = true;

    terminal.hide_cursor()?;

    // Initial render
    app.drain_messages(&mut ui_rx);
    terminal.draw(|f| app.draw(f))?;

    loop {
        let timeout = session.dmn_interval();

        tokio::select! {
            biased;

            maybe_event = reader.next() => {
                match maybe_event {
                    Some(Ok(Event::Key(key))) => {
                        if key.kind != KeyEventKind::Press { continue; }
                        app.handle_key(key);
                        idle_state.user_activity();
                        if app.screen == tui::Screen::Thalamus {
                            let tx = channel_tx.clone();
                            tokio::spawn(async move {
                                let result = crate::thalamus::channels::fetch_all_channels().await;
                                let _ = tx.send(result).await;
                            });
                        }
                        dirty = true;
                    }
                    Some(Ok(Event::Mouse(mouse))) => {
                        app.handle_mouse(mouse);
                        dirty = true;
                    }
                    Some(Ok(Event::Resize(w, h))) => {
                        app.handle_resize(w, h);
                        terminal.clear()?;
                        dirty = true;
                    }
                    Some(Err(_)) => break,
                    None => break,
                    _ => continue,
                }
            }

            Some(line) = observe_input_rx.recv() => {
                app.submitted.push(line);
                dirty = true;
            }

            Some((result, target)) = turn_rx.recv() => {
                session.handle_turn_result(result, target).await;
                idle_state.response_activity();
                dirty = true;
            }

            _ = render_interval.tick() => {
                let new_count = session.agent.lock().await.active_tools.lock().unwrap().len() as u32;
                if new_count != app.running_processes {
                    app.running_processes = new_count;
                    dirty = true;
                }
                idle_state.decay_ewma();
                app.update_idle(&idle_state);

                while let Ok(notif) = notify_rx.try_recv() {
                    pending_notifications.push(notif);
                    let tx = channel_tx.clone();
                    tokio::spawn(async move {
                        let result = crate::thalamus::channels::fetch_all_channels().await;
                        let _ = tx.send(result).await;
                    });
                }
            }

            _ = tokio::time::sleep(timeout), if !session.turn_in_progress => {
                session.dmn_tick();
                dirty = true;
            }

            Some(channels) = channel_rx.recv() => {
                app.set_channel_status(channels);
                dirty = true;
            }

            Some(msg) = ui_rx.recv() => {
                app.handle_ui_message(msg);
                dirty = true;
            }
        }

        // Process submitted input
        let submitted: Vec<String> = app.submitted.drain(..).collect();
        for input in submitted {
            let input = input.trim().to_string();
            if input.is_empty() { continue; }
            match session.handle_command(&input).await {
                Command::Quit => app.should_quit = true,
                Command::Handled => {}
                Command::None => session.submit_input(input),
            }
        }

        // Process hotkey actions
        let actions: Vec<HotkeyAction> = app.hotkey_actions.drain(..).collect();
        for action in actions {
            match action {
                HotkeyAction::CycleReasoning => session.cycle_reasoning(&mut app),
                HotkeyAction::KillProcess => session.kill_processes().await,
                HotkeyAction::Interrupt => session.interrupt().await,
                HotkeyAction::CycleAutonomy => session.cycle_autonomy(),
                HotkeyAction::AdjustSampling(param, delta) => {
                    if let Ok(mut agent) = session.agent.try_lock() {
                        match param {
                            0 => { agent.temperature = (agent.temperature + delta).clamp(0.0, 2.0); app.temperature = agent.temperature; }
                            1 => { agent.top_p = (agent.top_p + delta).clamp(0.0, 1.0); app.top_p = agent.top_p; }
                            2 => { agent.top_k = (agent.top_k as f32 + delta).max(0.0) as u32; app.top_k = agent.top_k; }
                            _ => {}
                        }
                    }
                }
            }
        }

        if app.drain_messages(&mut ui_rx) {
            dirty = true;
        }

        if dirty {
            terminal.draw(|f| app.draw(f))?;
            dirty = false;
        }

        if app.should_quit {
            break;
        }
    }

    session.shutdown().await;
    tui::restore_terminal(&mut terminal)?;
    Ok(())
}