scud/commands/spawn/tui/

app.rs

//! Application state for TUI monitor
//!
//! Three-panel design:
//! - Top: Waves/Tasks panel showing tasks by execution wave
//! - Middle: Agents panel showing running agents
//! - Bottom: Live terminal output from selected agent
//!
//! Tab switches focus between panels. Space toggles task selection for spawning.

use anyhow::Result;
use std::collections::{HashMap, HashSet};
use std::path::PathBuf;
use std::process::Command;
use std::time::{Duration, Instant};

use crate::commands::spawn::monitor::{
    load_session, save_session, AgentState, AgentStatus, SpawnSession,
};
use crate::commands::swarm::session as swarm_session;
use crate::models::phase::Phase;
use crate::models::task::{Task, TaskStatus};
use crate::storage::Storage;

/// View mode for the TUI
#[derive(Debug, Clone, PartialEq)]
pub enum ViewMode {
    /// Three-panel view: waves + agents + output
    Split,
    /// Fullscreen: just the selected agent's terminal
    Fullscreen,
    /// Input mode: typing a command to send to agent
    Input,
}

/// Which panel is focused
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum FocusedPanel {
    Waves,
    Agents,
    Output,
}

/// Task state in the waves view
#[derive(Debug, Clone, PartialEq)]
pub enum WaveTaskState {
    /// Ready to spawn (dependencies met, pending)
    Ready,
    /// Currently running (agent spawned)
    Running,
    /// Completed
    Done,
    /// Blocked by dependencies
    Blocked,
    /// In progress but no agent visible
    InProgress,
}

/// Information about a task in a wave
#[derive(Debug, Clone)]
pub struct WaveTask {
    pub id: String,
    pub title: String,
    pub tag: String,
    pub state: WaveTaskState,
    pub complexity: u32,
    pub dependencies: Vec<String>,
}

/// A wave of tasks that can run in parallel
#[derive(Debug, Clone)]
pub struct Wave {
    pub number: usize,
    pub tasks: Vec<WaveTask>,
}

/// Application state
pub struct App {
    /// Project root directory
    pub project_root: Option<PathBuf>,
    /// Session name being monitored
    pub session_name: String,
    /// Current spawn session data
    pub session: Option<SpawnSession>,
    /// Selected agent index
    pub selected: usize,
    /// Current view mode
    pub view_mode: ViewMode,
    /// Show help overlay
    pub show_help: bool,
    /// Last refresh time
    last_refresh: Instant,
    /// Refresh interval
    refresh_interval: Duration,
    /// Error message to display
    pub error: Option<String>,
    /// Live terminal output for selected agent (cached)
    pub live_output: Vec<String>,
    /// Last output refresh
    last_output_refresh: Instant,
    /// Output refresh interval (faster than status refresh)
    output_refresh_interval: Duration,
    /// Input buffer for sending commands to agent
    pub input_buffer: String,
    /// Scroll offset for terminal output (0 = bottom, positive = scrolled up)
    pub scroll_offset: usize,
    /// Auto-scroll to bottom on new output
    pub auto_scroll: bool,

    // === New three-panel state ===
    /// Which panel is currently focused
    pub focused_panel: FocusedPanel,
    /// Execution waves with tasks
    pub waves: Vec<Wave>,
    /// Selected task IDs for batch spawning
    pub selected_tasks: HashSet<String>,
    /// Selected task index within waves panel
    pub wave_task_index: usize,
    /// Scroll offset for waves panel (first visible line)
    pub wave_scroll_offset: usize,
    /// Scroll offset for agents panel (first visible line)
    pub agents_scroll_offset: usize,
    /// Active tag for loading waves
    pub active_tag: Option<String>,
    /// All phases data (cached)
    phases: HashMap<String, Phase>,

    // === Ralph Mode (autonomous wave execution) ===
    /// Whether Ralph mode is enabled (auto-spawn ready tasks)
    pub ralph_mode: bool,
    /// Maximum parallel agents in Ralph mode
    pub ralph_max_parallel: usize,
    /// Last time we checked for new tasks to spawn in Ralph mode
    last_ralph_check: Instant,

    // === Swarm Mode ===
    /// Whether we're monitoring a swarm session (vs spawn session)
    pub swarm_mode: bool,
    /// Swarm session data (when swarm_mode is true)
    pub swarm_session_data: Option<swarm_session::SwarmSession>,
}

impl App {
    /// Create new app state
    pub fn new(project_root: Option<PathBuf>, session_name: &str, swarm_mode: bool) -> Result<Self> {
        // Load storage to get active tag and phases
        let storage = Storage::new(project_root.clone());
        let active_tag = storage.get_active_group().ok().flatten();
        let phases = storage.load_tasks().unwrap_or_default();

        let mut app = Self {
            project_root,
            session_name: session_name.to_string(),
            session: None,
            selected: 0,
            view_mode: ViewMode::Split,
            show_help: false,
            last_refresh: Instant::now(),
            refresh_interval: Duration::from_secs(2),
            error: None,
            live_output: Vec::new(),
            last_output_refresh: Instant::now(),
            output_refresh_interval: Duration::from_millis(500),
            input_buffer: String::new(),
            scroll_offset: 0,
            auto_scroll: true,
            // New fields
            focused_panel: FocusedPanel::Waves,
            waves: Vec::new(),
            selected_tasks: HashSet::new(),
            wave_task_index: 0,
            wave_scroll_offset: 0,
            agents_scroll_offset: 0,
            active_tag,
            phases,
            // Ralph mode
            ralph_mode: false,
            ralph_max_parallel: 5,
            last_ralph_check: Instant::now(),
            // Swarm mode
            swarm_mode,
            swarm_session_data: None,
        };
        app.refresh()?;
        app.refresh_waves();
        app.refresh_live_output();
        Ok(app)
    }

    /// Refresh session data from disk and update agent statuses
    pub fn refresh(&mut self) -> Result<()> {
        if self.swarm_mode {
            // Load swarm session
            match swarm_session::load_session(self.project_root.as_ref(), &self.session_name) {
                Ok(session) => {
                    self.swarm_session_data = Some(session);
                    self.error = None;
                }
                Err(e) => {
                    self.error = Some(format!("Failed to load swarm session: {}", e));
                }
            }
        } else {
            // Load spawn session
            match load_session(self.project_root.as_ref(), &self.session_name) {
                Ok(mut session) => {
                    // Update agent statuses from tmux and SCUD task status
                    self.refresh_agent_statuses(&mut session);

                    // Save updated session back to disk
                    let _ = save_session(self.project_root.as_ref(), &session);

                    self.session = Some(session);
                    self.error = None;
                }
                Err(e) => {
                    self.error = Some(format!("Failed to load session: {}", e));
                }
            }
        }
        self.last_refresh = Instant::now();
        Ok(())
    }

    /// Refresh live output from the selected agent's tmux pane
    pub fn refresh_live_output(&mut self) {
        let agents = self.agents();
        if agents.is_empty() || self.selected >= agents.len() {
            self.live_output = vec!["No agent selected".to_string()];
            return;
        }

        let agent = &agents[self.selected];
        let session = match &self.session {
            Some(s) => s,
            None => {
                self.live_output = vec!["No session loaded".to_string()];
                return;
            }
        };

        // Get tmux windows to find the correct window index
        let tmux_windows = self.get_tmux_windows(&session.session_name);
        let matching_window = tmux_windows.iter().find(|(_, name)| {
            name.starts_with(&agent.window_name) || agent.window_name.starts_with(name)
        });

        let window_target = match matching_window {
            Some((index, _)) => format!("{}:{}", session.session_name, index),
            None => {
                self.live_output = vec![format!("Window '{}' not found", agent.window_name)];
                return;
            }
        };

        // Capture pane content with scrollback
        let output = Command::new("tmux")
            .args([
                "capture-pane",
                "-t",
                &window_target,
                "-p", // print to stdout
                "-S",
                "-100", // start from 100 lines back
            ])
            .output();

        match output {
            Ok(out) if out.status.success() => {
                let content = String::from_utf8_lossy(&out.stdout);
                self.live_output = content.lines().map(|s| s.to_string()).collect();

                // Remove trailing empty lines
                while self
                    .live_output
                    .last()
                    .map(|s| s.trim().is_empty())
                    .unwrap_or(false)
                {
                    self.live_output.pop();
                }
            }
            Ok(out) => {
                self.live_output = vec![format!("Error: {}", String::from_utf8_lossy(&out.stderr))];
            }
            Err(e) => {
                self.live_output = vec![format!("tmux error: {}", e)];
            }
        }

        self.last_output_refresh = Instant::now();
    }

    /// Refresh agent statuses by checking tmux windows and SCUD task status
    fn refresh_agent_statuses(&self, session: &mut SpawnSession) {
        let tmux_windows = self.get_tmux_windows(&session.session_name);
        let storage = Storage::new(self.project_root.clone());
        let all_phases = storage.load_tasks().ok();

        for agent in &mut session.agents {
            let window_exists = tmux_windows.iter().any(|(_, name)| {
                name.starts_with(&agent.window_name) || agent.window_name.starts_with(name)
            });

            let task_status = all_phases.as_ref().and_then(|phases| {
                phases.get(&agent.tag).and_then(|phase| {
                    phase
                        .get_task(&agent.task_id)
                        .map(|task| task.status.clone())
                })
            });

            agent.status = match (&task_status, window_exists) {
                (Some(TaskStatus::Done), _) => AgentStatus::Completed,
                (Some(TaskStatus::Blocked), _) => AgentStatus::Failed,
                (Some(TaskStatus::InProgress), true) => AgentStatus::Running,
                (Some(TaskStatus::InProgress), false) => AgentStatus::Completed,
                (_, false) => AgentStatus::Completed,
                (_, true) => AgentStatus::Running,
            };
        }
    }

    /// Get list of tmux windows for a session: [(index, name), ...]
    fn get_tmux_windows(&self, session_name: &str) -> Vec<(usize, String)> {
        let output = Command::new("tmux")
            .args([
                "list-windows",
                "-t",
                session_name,
                "-F",
                "#{window_index}:#{window_name}",
            ])
            .output();

        match output {
            Ok(out) if out.status.success() => String::from_utf8_lossy(&out.stdout)
                .lines()
                .filter_map(|line| {
                    let parts: Vec<&str> = line.splitn(2, ':').collect();
                    if parts.len() == 2 {
                        parts[0].parse().ok().map(|idx| (idx, parts[1].to_string()))
                    } else {
                        None
                    }
                })
                .collect(),
            _ => Vec::new(),
        }
    }

    /// Periodic tick - refresh data as needed
    pub fn tick(&mut self) -> Result<()> {
        // Refresh session/status data periodically
        if self.last_refresh.elapsed() >= self.refresh_interval {
            self.refresh()?;
            self.refresh_waves();
        }

        // Refresh live output more frequently
        if self.last_output_refresh.elapsed() >= self.output_refresh_interval {
            self.refresh_live_output();
        }

        // Ralph mode: auto-spawn ready tasks
        if self.ralph_mode && self.last_ralph_check.elapsed() >= Duration::from_secs(5) {
            self.ralph_auto_spawn();
            self.last_ralph_check = Instant::now();
        }

        Ok(())
    }

    /// Toggle Ralph mode (autonomous wave execution)
    pub fn toggle_ralph_mode(&mut self) {
        self.ralph_mode = !self.ralph_mode;
        if self.ralph_mode {
            // Immediately check for tasks to spawn
            self.ralph_auto_spawn();
        }
    }

    /// Auto-spawn ready tasks in Ralph mode
    fn ralph_auto_spawn(&mut self) {
        // Count running agents
        let running_count = self
            .agents()
            .iter()
            .filter(|a| a.status == AgentStatus::Running || a.status == AgentStatus::Starting)
            .count();

        if running_count >= self.ralph_max_parallel {
            return; // Already at max parallel
        }

        // Find ready tasks to spawn
        let slots_available = self.ralph_max_parallel - running_count;
        let mut tasks_to_spawn: Vec<String> = Vec::new();

        for wave in &self.waves {
            for task in &wave.tasks {
                if task.state == WaveTaskState::Ready && !self.selected_tasks.contains(&task.id) {
                    // Check if already have an agent for this task
                    let already_spawned = self.agents().iter().any(|a| a.task_id == task.id);
                    if !already_spawned {
                        tasks_to_spawn.push(task.id.clone());
                        if tasks_to_spawn.len() >= slots_available {
                            break;
                        }
                    }
                }
            }
            if tasks_to_spawn.len() >= slots_available {
                break;
            }
        }

        // Spawn the tasks with Ralph loop enabled
        for task_id in tasks_to_spawn {
            let _ = self.spawn_task_with_ralph(&task_id);
        }
    }

    /// Get agents list
    pub fn agents(&self) -> &[AgentState] {
        self.session
            .as_ref()
            .map(|s| s.agents.as_slice())
            .unwrap_or(&[])
    }

    /// Select next agent
    pub fn next_agent(&mut self) {
        let len = self.agents().len();
        if len > 0 {
            self.selected = (self.selected + 1) % len;
            self.adjust_agents_scroll();
            self.reset_scroll();
            self.refresh_live_output();
        }
    }

    /// Select previous agent
    pub fn previous_agent(&mut self) {
        let len = self.agents().len();
        if len > 0 {
            self.selected = if self.selected > 0 {
                self.selected - 1
            } else {
                len - 1
            };
            self.adjust_agents_scroll();
            self.reset_scroll();
            self.refresh_live_output();
        }
    }

    /// Adjust agents scroll offset to keep selected agent visible
    /// Assumes roughly 8 visible lines in the agents panel
    pub fn adjust_agents_scroll(&mut self) {
        const VISIBLE_LINES: usize = 8;

        // Scroll up if selected is above visible area
        if self.selected < self.agents_scroll_offset {
            self.agents_scroll_offset = self.selected;
        }
        // Scroll down if selected is below visible area
        else if self.selected >= self.agents_scroll_offset + VISIBLE_LINES {
            self.agents_scroll_offset = self.selected.saturating_sub(VISIBLE_LINES - 1);
        }
    }

    /// Toggle fullscreen mode
    pub fn toggle_fullscreen(&mut self) {
        self.view_mode = match self.view_mode {
            ViewMode::Split => ViewMode::Fullscreen,
            ViewMode::Fullscreen => ViewMode::Split,
            ViewMode::Input => ViewMode::Fullscreen,
        };
    }

    /// Exit current mode (go back to split)
    pub fn exit_fullscreen(&mut self) {
        self.view_mode = ViewMode::Split;
        self.input_buffer.clear();
    }

    /// Enter input mode
    pub fn enter_input_mode(&mut self) {
        self.view_mode = ViewMode::Input;
        self.input_buffer.clear();
    }

    /// Add character to input buffer
    pub fn input_char(&mut self, c: char) {
        self.input_buffer.push(c);
    }

    /// Delete last character from input buffer
    pub fn input_backspace(&mut self) {
        self.input_buffer.pop();
    }

    /// Send the input buffer to the selected agent's tmux pane
    pub fn send_input(&mut self) -> Result<()> {
        if self.input_buffer.is_empty() {
            return Ok(());
        }

        let session = match &self.session {
            Some(s) => s,
            None => {
                self.error = Some("No session loaded".to_string());
                return Ok(());
            }
        };

        let agents = self.agents();
        if agents.is_empty() || self.selected >= agents.len() {
            self.error = Some("No agent selected".to_string());
            return Ok(());
        }

        let agent = &agents[self.selected];

        // Find window index
        let tmux_windows = self.get_tmux_windows(&session.session_name);
        let matching_window = tmux_windows.iter().find(|(_, name)| {
            name.starts_with(&agent.window_name) || agent.window_name.starts_with(name)
        });

        let window_target = match matching_window {
            Some((index, _)) => format!("{}:{}", session.session_name, index),
            None => {
                self.error = Some(format!("Window not found for {}", agent.task_id));
                return Ok(());
            }
        };

        // Send the input to tmux
        let result = Command::new("tmux")
            .args([
                "send-keys",
                "-t",
                &window_target,
                &self.input_buffer,
                "Enter",
            ])
            .output();

        match result {
            Ok(out) if out.status.success() => {
                self.error = None;
                self.input_buffer.clear();
                self.view_mode = ViewMode::Fullscreen; // Go to fullscreen to see result
                self.refresh_live_output();
            }
            Ok(out) => {
                self.error = Some(format!(
                    "Send failed: {}",
                    String::from_utf8_lossy(&out.stderr)
                ));
            }
            Err(e) => {
                self.error = Some(format!("tmux error: {}", e));
            }
        }

        Ok(())
    }

    /// Restart the selected agent (kill and respawn claude)
    pub fn restart_agent(&mut self) -> Result<()> {
        let session = match &self.session {
            Some(s) => s,
            None => return Ok(()),
        };

        let agents = self.agents();
        if agents.is_empty() || self.selected >= agents.len() {
            return Ok(());
        }

        let agent = &agents[self.selected];

        // Find window
        let tmux_windows = self.get_tmux_windows(&session.session_name);
        let matching_window = tmux_windows.iter().find(|(_, name)| {
            name.starts_with(&agent.window_name) || agent.window_name.starts_with(name)
        });

        if let Some((index, _)) = matching_window {
            let target = format!("{}:{}", session.session_name, index);

            // Send Ctrl+C to interrupt current process
            let _ = Command::new("tmux")
                .args(["send-keys", "-t", &target, "C-c"])
                .output();

            // Small delay
            std::thread::sleep(Duration::from_millis(200));

            // Clear and show message
            let _ = Command::new("tmux")
                .args([
                    "send-keys",
                    "-t",
                    &target,
                    "echo 'Agent restarted by user'",
                    "Enter",
                ])
                .output();

            self.error = None;
            self.refresh_live_output();
        }

        Ok(())
    }

    /// Toggle help overlay
    pub fn toggle_help(&mut self) {
        self.show_help = !self.show_help;
    }

    /// Scroll terminal output up (show older content)
    pub fn scroll_up(&mut self, lines: usize) {
        let max_scroll = self.live_output.len().saturating_sub(1);
        self.scroll_offset = (self.scroll_offset + lines).min(max_scroll);
        self.auto_scroll = false;
    }

    /// Scroll terminal output down (show newer content)
    pub fn scroll_down(&mut self, lines: usize) {
        self.scroll_offset = self.scroll_offset.saturating_sub(lines);
        if self.scroll_offset == 0 {
            self.auto_scroll = true;
        }
    }

    /// Jump to bottom of terminal output
    pub fn scroll_to_bottom(&mut self) {
        self.scroll_offset = 0;
        self.auto_scroll = true;
    }

    /// Reset scroll when switching agents
    fn reset_scroll(&mut self) {
        self.scroll_offset = 0;
        self.auto_scroll = true;
    }

    /// Get status counts (starting, running, completed, failed)
    pub fn status_counts(&self) -> (usize, usize, usize, usize) {
        let agents = self.agents();
        let starting = agents
            .iter()
            .filter(|a| a.status == AgentStatus::Starting)
            .count();
        let running = agents
            .iter()
            .filter(|a| a.status == AgentStatus::Running)
            .count();
        let completed = agents
            .iter()
            .filter(|a| a.status == AgentStatus::Completed)
            .count();
        let failed = agents
            .iter()
            .filter(|a| a.status == AgentStatus::Failed)
            .count();
        (starting, running, completed, failed)
    }

    /// Get the selected agent (if any)
    pub fn selected_agent(&self) -> Option<&AgentState> {
        let agents = self.agents();
        if agents.is_empty() || self.selected >= agents.len() {
            None
        } else {
            Some(&agents[self.selected])
        }
    }

    // === Wave-related methods ===

    /// Refresh waves data from phases
    pub fn refresh_waves(&mut self) {
        // Reload phases from storage
        let storage = Storage::new(self.project_root.clone());
        self.phases = storage.load_tasks().unwrap_or_default();

        // In swarm mode, use actual wave data from swarm session
        if self.swarm_mode {
            self.waves = self.compute_swarm_waves();
            return;
        }

        // Get running agent task IDs
        let running_task_ids: HashSet<String> = self
            .agents()
            .iter()
            .filter(|a| a.status == AgentStatus::Running || a.status == AgentStatus::Starting)
            .map(|a| a.task_id.clone())
            .collect();

        // Determine which tag to use
        let tag = self.active_tag.clone().or_else(|| {
            // Try to get tag from session
            self.session.as_ref().map(|s| s.tag.clone())
        });

        let Some(tag) = tag else {
            self.waves = Vec::new();
            return;
        };

        let Some(phase) = self.phases.get(&tag) else {
            self.waves = Vec::new();
            return;
        };

        // Build waves using topological sort
        self.waves = self.compute_waves(phase, &running_task_ids);
    }

    /// Compute waves from swarm session data (shows actual execution waves)
    fn compute_swarm_waves(&self) -> Vec<Wave> {
        let Some(ref swarm) = self.swarm_session_data else {
            return Vec::new();
        };

        let tag = &swarm.tag;
        let phase = self.phases.get(tag);

        swarm
            .waves
            .iter()
            .map(|wave_state| {
                // Collect all task IDs from all rounds in this wave
                let task_ids: Vec<String> = wave_state
                    .rounds
                    .iter()
                    .flat_map(|round| round.task_ids.iter().cloned())
                    .collect();

                let tasks: Vec<WaveTask> = task_ids
                    .iter()
                    .map(|task_id| {
                        // Try to get task info from phase
                        let (title, complexity, dependencies, task_status) =
                            if let Some(phase) = phase {
                                if let Some(task) = phase.get_task(task_id) {
                                    (
                                        task.title.clone(),
                                        task.complexity,
                                        task.dependencies.clone(),
                                        Some(task.status.clone()),
                                    )
                                } else {
                                    (task_id.clone(), 1, vec![], None)
                                }
                            } else {
                                (task_id.clone(), 1, vec![], None)
                            };

                        // Determine state based on task status and wave completion
                        let state = match task_status {
                            Some(TaskStatus::Done) => WaveTaskState::Done,
                            Some(TaskStatus::InProgress) => WaveTaskState::Running,
                            Some(TaskStatus::Blocked) => WaveTaskState::Blocked,
                            Some(TaskStatus::Pending) => {
                                if wave_state.completed_at.is_some() {
                                    // Wave completed but task still pending = failed/blocked
                                    WaveTaskState::Blocked
                                } else {
                                    WaveTaskState::Ready
                                }
                            }
                            _ => WaveTaskState::Ready,
                        };

                        WaveTask {
                            id: task_id.clone(),
                            title,
                            tag: tag.clone(),
                            state,
                            complexity,
                            dependencies,
                        }
                    })
                    .collect();

                Wave {
                    number: wave_state.wave_number,
                    tasks,
                }
            })
            .collect()
    }

    /// Compute execution waves for a phase
    fn compute_waves(&self, phase: &Phase, running_task_ids: &HashSet<String>) -> Vec<Wave> {
        // Collect actionable tasks
        let mut actionable: Vec<&Task> = Vec::new();
        for task in &phase.tasks {
            if task.status == TaskStatus::Done
                || task.status == TaskStatus::Expanded
                || task.status == TaskStatus::Cancelled
            {
                continue;
            }

            // Skip parent tasks that have subtasks - only subtasks should be spawned
            if !task.subtasks.is_empty() {
                continue;
            }

            // If subtask, only include if parent is expanded
            if let Some(ref parent_id) = task.parent_id {
                let parent_expanded = phase
                    .get_task(parent_id)
                    .map(|p| p.is_expanded())
                    .unwrap_or(false);
                if !parent_expanded {
                    continue;
                }
            }

            actionable.push(task);
        }

        if actionable.is_empty() {
            return Vec::new();
        }

        // Build dependency graph
        let task_ids: HashSet<String> = actionable.iter().map(|t| t.id.clone()).collect();
        let mut in_degree: HashMap<String, usize> = HashMap::new();
        let mut dependents: HashMap<String, Vec<String>> = HashMap::new();

        for task in &actionable {
            in_degree.entry(task.id.clone()).or_insert(0);

            for dep in &task.dependencies {
                if task_ids.contains(dep) {
                    // Internal dependency - track in graph
                    *in_degree.entry(task.id.clone()).or_insert(0) += 1;
                    dependents
                        .entry(dep.clone())
                        .or_default()
                        .push(task.id.clone());
                } else {
                    // External dependency - check if satisfied
                    // If not satisfied (e.g., Expanded with incomplete subtasks), block this task
                    if !self.is_dependency_satisfied(dep, phase) {
                        // Mark as blocked by setting very high in_degree
                        *in_degree.entry(task.id.clone()).or_insert(0) += 1000;
                    }
                }
            }
        }

        // Kahn's algorithm with wave tracking
        let mut waves: Vec<Wave> = Vec::new();
        let mut remaining = in_degree.clone();
        let mut wave_number = 1;

        while !remaining.is_empty() {
            let mut ready: Vec<String> = remaining
                .iter()
                .filter(|(_, &deg)| deg == 0)
                .map(|(id, _)| id.clone())
                .collect();

            if ready.is_empty() {
                break; // Circular dependency
            }

            // Sort for stable display order
            ready.sort();

            // Build wave tasks with state
            let mut wave_tasks: Vec<WaveTask> = ready
                .iter()
                .filter_map(|task_id| {
                    actionable.iter().find(|t| &t.id == task_id).map(|task| {
                        let state = if task.status == TaskStatus::Done {
                            WaveTaskState::Done
                        } else if running_task_ids.contains(&task.id) {
                            WaveTaskState::Running
                        } else if task.status == TaskStatus::InProgress {
                            WaveTaskState::InProgress
                        } else if task.status == TaskStatus::Blocked {
                            WaveTaskState::Blocked
                        } else if self.is_task_ready(task, phase) {
                            WaveTaskState::Ready
                        } else {
                            WaveTaskState::Blocked
                        };

                        WaveTask {
                            id: task.id.clone(),
                            title: task.title.clone(),
                            tag: self.active_tag.clone().unwrap_or_default(),
                            state,
                            complexity: task.complexity,
                            dependencies: task.dependencies.clone(),
                        }
                    })
                })
                .collect();

            // Remove ready tasks and update dependents
            for task_id in &ready {
                remaining.remove(task_id);
                if let Some(deps) = dependents.get(task_id) {
                    for dep_id in deps {
                        if let Some(deg) = remaining.get_mut(dep_id) {
                            *deg = deg.saturating_sub(1);
                        }
                    }
                }
            }

            if !wave_tasks.is_empty() {
                // Sort tasks by ID for stable display
                wave_tasks.sort_by(|a, b| a.id.cmp(&b.id));
                waves.push(Wave {
                    number: wave_number,
                    tasks: wave_tasks,
                });
            }
            wave_number += 1;
        }

        waves
    }

    /// Check if a task is ready (dependencies met, pending)
    fn is_task_ready(&self, task: &Task, phase: &Phase) -> bool {
        if task.status != TaskStatus::Pending {
            return false;
        }

        // Check all dependencies are satisfied
        for dep_id in &task.dependencies {
            if !self.is_dependency_satisfied(dep_id, phase) {
                return false;
            }
        }

        true
    }

    /// Check if a dependency is satisfied (Done, or Expanded with all subtasks done)
    fn is_dependency_satisfied(&self, dep_id: &str, phase: &Phase) -> bool {
        let Some(dep) = phase.get_task(dep_id) else {
            return true; // If dep not found, assume external/done
        };

        match dep.status {
            TaskStatus::Done => true,
            TaskStatus::Expanded => {
                // Expanded task is only satisfied if all its subtasks are done
                if dep.subtasks.is_empty() {
                    false // Expanded with no subtasks = not done yet
                } else {
                    dep.subtasks.iter().all(|subtask_id| {
                        phase
                            .get_task(subtask_id)
                            .map(|st| st.status == TaskStatus::Done)
                            .unwrap_or(false)
                    })
                }
            }
            _ => false, // Pending, InProgress, Blocked, Cancelled = not satisfied
        }
    }

    /// Get flat list of all tasks in waves for navigation
    pub fn all_wave_tasks(&self) -> Vec<&WaveTask> {
        self.waves.iter().flat_map(|w| w.tasks.iter()).collect()
    }

    /// Get currently selected wave task
    pub fn selected_wave_task(&self) -> Option<&WaveTask> {
        let all_tasks = self.all_wave_tasks();
        all_tasks.get(self.wave_task_index).copied()
    }

    // === Panel navigation ===

    /// Switch focus to next panel
    pub fn next_panel(&mut self) {
        self.focused_panel = match self.focused_panel {
            FocusedPanel::Waves => FocusedPanel::Agents,
            FocusedPanel::Agents => FocusedPanel::Output,
            FocusedPanel::Output => FocusedPanel::Waves,
        };
    }

    /// Switch focus to previous panel
    pub fn previous_panel(&mut self) {
        self.focused_panel = match self.focused_panel {
            FocusedPanel::Waves => FocusedPanel::Output,
            FocusedPanel::Agents => FocusedPanel::Waves,
            FocusedPanel::Output => FocusedPanel::Agents,
        };
    }

    /// Move selection up in current panel
    pub fn move_up(&mut self) {
        match self.focused_panel {
            FocusedPanel::Waves => {
                if self.wave_task_index > 0 {
                    self.wave_task_index -= 1;
                    self.adjust_wave_scroll();
                }
            }
            FocusedPanel::Agents => self.previous_agent(),
            FocusedPanel::Output => self.scroll_up(1),
        }
    }

    /// Move selection down in current panel
    pub fn move_down(&mut self) {
        match self.focused_panel {
            FocusedPanel::Waves => {
                let max = self.all_wave_tasks().len().saturating_sub(1);
                if self.wave_task_index < max {
                    self.wave_task_index += 1;
                    self.adjust_wave_scroll();
                }
            }
            FocusedPanel::Agents => self.next_agent(),
            FocusedPanel::Output => self.scroll_down(1),
        }
    }

    /// Adjust wave scroll offset to keep selected item visible
    /// Assumes visible height of ~4 items (plus wave headers)
    fn adjust_wave_scroll(&mut self) {
        // Calculate the line index of the current task
        // Each wave has 1 header line, then tasks
        let mut line_idx = 0;
        let mut found = false;
        let mut task_counter = 0;

        for wave in &self.waves {
            line_idx += 1; // wave header
            for _ in &wave.tasks {
                if task_counter == self.wave_task_index {
                    found = true;
                    break;
                }
                line_idx += 1;
                task_counter += 1;
            }
            if found {
                break;
            }
        }

        // Visible height is approximately 4-5 lines in the waves panel
        let visible_height = 4;

        // Scroll to keep current line visible
        if line_idx < self.wave_scroll_offset {
            self.wave_scroll_offset = line_idx;
        } else if line_idx >= self.wave_scroll_offset + visible_height {
            self.wave_scroll_offset = line_idx.saturating_sub(visible_height - 1);
        }
    }

    // === Task selection for spawning ===

    /// Toggle selection of currently highlighted task
    pub fn toggle_task_selection(&mut self) {
        if let Some(task) = self.selected_wave_task() {
            let task_id = task.id.clone();
            if self.selected_tasks.contains(&task_id) {
                self.selected_tasks.remove(&task_id);
            } else {
                // Only allow selecting ready tasks
                if task.state == WaveTaskState::Ready {
                    self.selected_tasks.insert(task_id);
                }
            }
        }
    }

    /// Select all ready tasks in waves
    pub fn select_all_ready(&mut self) {
        for wave in &self.waves {
            for task in &wave.tasks {
                if task.state == WaveTaskState::Ready {
                    self.selected_tasks.insert(task.id.clone());
                }
            }
        }
    }

    /// Clear all task selections
    pub fn clear_selection(&mut self) {
        self.selected_tasks.clear();
    }

    /// Get count of ready tasks
    pub fn ready_task_count(&self) -> usize {
        self.waves
            .iter()
            .flat_map(|w| &w.tasks)
            .filter(|t| t.state == WaveTaskState::Ready)
            .count()
    }

    /// Get count of selected tasks
    pub fn selected_task_count(&self) -> usize {
        self.selected_tasks.len()
    }

    /// Get selected tasks for spawning
    pub fn get_selected_tasks(&self) -> Vec<&WaveTask> {
        self.all_wave_tasks()
            .into_iter()
            .filter(|t| self.selected_tasks.contains(&t.id))
            .collect()
    }

    /// Spawn the selected tasks
    /// Returns the number of tasks successfully spawned
    pub fn spawn_selected_tasks(&mut self) -> Result<usize> {
        use crate::commands::spawn::{agent, terminal};

        let tasks_to_spawn: Vec<(String, String, String)> = self
            .get_selected_tasks()
            .iter()
            .map(|t| (t.id.clone(), t.title.clone(), t.tag.clone()))
            .collect();

        if tasks_to_spawn.is_empty() {
            return Ok(0);
        }

        // Get working directory
        let working_dir = self
            .project_root
            .clone()
            .unwrap_or_else(|| std::env::current_dir().unwrap_or_default());

        // Get session info
        let session = match &self.session {
            Some(s) => s,
            None => {
                self.error = Some("No session loaded".to_string());
                return Ok(0);
            }
        };

        let session_name = session.session_name.clone();
        let mut spawned_count = 0;

        // Load phase to get full task data
        let storage = Storage::new(self.project_root.clone());

        for (task_id, task_title, tag) in &tasks_to_spawn {
            // Get full task from phase
            let phase = match self.phases.get(tag) {
                Some(p) => p,
                None => continue,
            };

            let task = match phase.get_task(task_id) {
                Some(t) => t,
                None => continue,
            };

            // Generate prompt
            let prompt = agent::generate_prompt(task, tag);

            // Spawn in tmux (always use tmux from TUI since we're in a session)
            match terminal::spawn_terminal(task_id, &prompt, &working_dir, &session_name) {
                Ok(_window_index) => {
                    spawned_count += 1;

                    // Add to session agents
                    if let Some(ref mut session) = self.session {
                        session.add_agent(task_id, task_title, tag);
                    }

                    // Mark task as in-progress
                    if let Ok(mut phase) = storage.load_group(tag) {
                        if let Some(task) = phase.get_task_mut(task_id) {
                            task.set_status(TaskStatus::InProgress);
                            let _ = storage.update_group(tag, &phase);
                        }
                    }
                }
                Err(e) => {
                    self.error = Some(format!("Failed to spawn {}: {}", task_id, e));
                }
            }

            // Small delay between spawns
            if spawned_count < tasks_to_spawn.len() {
                std::thread::sleep(Duration::from_millis(300));
            }
        }

        // Save updated session
        if spawned_count > 0 {
            if let Some(ref session) = self.session {
                let _ = crate::commands::spawn::monitor::save_session(
                    self.project_root.as_ref(),
                    session,
                );
            }

            // Clear selection and refresh
            self.selected_tasks.clear();
            self.refresh()?;
            self.refresh_waves();
        }

        Ok(spawned_count)
    }

    /// Prepare to start swarm - returns swarm command and tag
    pub fn prepare_swarm_start(&self) -> Option<(String, String)> {
        // Get tag from session or active tag
        let tag = self
            .session
            .as_ref()
            .map(|s| s.tag.clone())
            .or_else(|| self.active_tag.clone())?;

        // Build swarm command
        let session_base = self
            .session_name
            .replace("swarm-", "")
            .replace("scud-", "");
        let cmd = format!("scud swarm --tag {} --session {}", tag, session_base);

        Some((cmd, tag))
    }

    /// Update the status of the currently selected agent's task
    pub fn set_selected_task_status(&mut self, new_status: TaskStatus) -> Result<()> {
        let Some(ref session) = self.session else {
            self.error = Some("No session loaded".to_string());
            return Ok(());
        };

        let agents = session.agents.clone();
        if agents.is_empty() || self.selected >= agents.len() {
            self.error = Some("No agent selected".to_string());
            return Ok(());
        }

        let agent = &agents[self.selected];
        let task_id = &agent.task_id;
        let tag = &agent.tag;

        // Update task status in storage
        let storage = Storage::new(self.project_root.clone());
        if let Ok(mut phase) = storage.load_group(tag) {
            if let Some(task) = phase.get_task_mut(task_id) {
                task.set_status(new_status.clone());
                if let Err(e) = storage.update_group(tag, &phase) {
                    self.error = Some(format!("Failed to save: {}", e));
                    return Ok(());
                }
                // Show confirmation
                self.error = Some(format!(
                    "✓ {} → {}",
                    task_id,
                    new_status.as_str()
                ));
            } else {
                self.error = Some(format!("Task {} not found", task_id));
            }
        } else {
            self.error = Some(format!("Failed to load phase {}", tag));
        }

        // Refresh to show updated status
        self.refresh()?;
        self.refresh_waves();

        Ok(())
    }

    /// Spawn a single task with Ralph loop enabled
    /// The agent will keep trying until the task is marked done
    fn spawn_task_with_ralph(&mut self, task_id: &str) -> Result<()> {
        use crate::commands::spawn::{agent, terminal};

        // Find the task in waves
        let task_info = self
            .waves
            .iter()
            .flat_map(|w| w.tasks.iter())
            .find(|t| t.id == task_id)
            .map(|t| (t.id.clone(), t.title.clone(), t.tag.clone()));

        let (task_id, task_title, tag) = match task_info {
            Some(info) => info,
            None => return Ok(()),
        };

        // Get working directory
        let working_dir = self
            .project_root
            .clone()
            .unwrap_or_else(|| std::env::current_dir().unwrap_or_default());

        // Get session info
        let session = match &self.session {
            Some(s) => s,
            None => {
                self.error = Some("No session loaded".to_string());
                return Ok(());
            }
        };

        let session_name = session.session_name.clone();

        // Load phase to get full task data
        let storage = Storage::new(self.project_root.clone());

        let phase = match self.phases.get(&tag) {
            Some(p) => p,
            None => return Ok(()),
        };

        let task = match phase.get_task(&task_id) {
            Some(t) => t,
            None => return Ok(()),
        };

        // Generate prompt with Ralph loop instructions
        let base_prompt = agent::generate_prompt(task, &tag);
        let ralph_prompt = format!(
            r#"{}

═══════════════════════════════════════════════════════════
RALPH LOOP MODE - Autonomous Task Completion
═══════════════════════════════════════════════════════════

CRITICAL: Your task ID is **{task_id}** (NOT any parent task!)

You are in a Ralph loop. Keep working until the task is COMPLETE.

After EACH attempt:
1. Run EXACTLY: scud set-status {task_id} done
   ⚠️  Use task ID "{task_id}" - do NOT use any other task ID!
2. Verify the task is truly done (tests pass, code works)
3. If something failed, fix it and try again

The loop will continue until task {task_id} is marked done.
Do NOT give up. Keep iterating until success.

When you have genuinely completed task {task_id}, output:
<promise>TASK {task_id} COMPLETE</promise>

DO NOT output this promise unless task {task_id} is TRULY complete!
═══════════════════════════════════════════════════════════
"#,
            base_prompt,
            task_id = task_id
        );

        // Spawn in tmux with Ralph loop wrapper
        match terminal::spawn_terminal_ralph(
            &task_id,
            &ralph_prompt,
            &working_dir,
            &session_name,
            &format!("TASK {} COMPLETE", task_id),
        ) {
            Ok(()) => {
                // Add to session agents
                if let Some(ref mut session) = self.session {
                    session.add_agent(&task_id, &task_title, &tag);
                }

                // Mark task as in-progress
                if let Ok(mut phase) = storage.load_group(&tag) {
                    if let Some(task) = phase.get_task_mut(&task_id) {
                        task.set_status(TaskStatus::InProgress);
                        let _ = storage.update_group(&tag, &phase);
                    }
                }

                // Save session
                if let Some(ref session) = self.session {
                    let _ = crate::commands::spawn::monitor::save_session(
                        self.project_root.as_ref(),
                        session,
                    );
                }

                // Refresh
                let _ = self.refresh();
                self.refresh_waves();
            }
            Err(e) => {
                self.error = Some(format!(
                    "Failed to spawn Ralph agent for {}: {}",
                    task_id, e
                ));
            }
        }

        Ok(())
    }
}