bee-tui 0.2.0

use std::path::PathBuf;
use std::sync::Arc;
use std::time::{SystemTime, UNIX_EPOCH};

use color_eyre::eyre::eyre;
use crossterm::event::KeyEvent;
use ratatui::prelude::Rect;
use serde::{Deserialize, Serialize};
use tokio::sync::{mpsc, watch};
use tokio_util::sync::CancellationToken;
use tracing::{debug, info};

use crate::{
    action::Action,
    api::ApiClient,
    components::{
        Component, api_health::ApiHealth, command_log::CommandLog,
        health::{Gate, GateStatus, Health},
        lottery::Lottery, network::Network, peers::Peers, stamps::Stamps, swap::Swap,
        tags::Tags, warmup::Warmup,
    },
    config::Config,
    log_capture,
    theme,
    tui::{Event, Tui},
    watch::{BeeWatch, HealthSnapshot},
};

pub struct App {
    config: Config,
    tick_rate: f64,
    frame_rate: f64,
    /// Top-level screens, in display order. Tab cycles among them.
    /// v0.4 also wires the k9s-style `:command` switcher so users
    /// can jump directly with `:peers`, `:stamps`, etc.
    screens: Vec<Box<dyn Component>>,
    /// Index into [`Self::screens`] for the currently visible screen.
    current_screen: usize,
    /// Always-on bottom strip; not part of `screens` because it
    /// renders alongside whatever screen is active.
    command_log: Box<dyn Component>,
    should_quit: bool,
    should_suspend: bool,
    mode: Mode,
    last_tick_key_events: Vec<KeyEvent>,
    action_tx: mpsc::UnboundedSender<Action>,
    action_rx: mpsc::UnboundedReceiver<Action>,
    /// Root cancellation token. Children: BeeWatch hub → per-resource
    /// pollers. Cancelling this on quit unwinds every spawned task.
    root_cancel: CancellationToken,
    /// Active Bee node connection; cheap to clone (`Arc<Inner>` under
    /// the hood). Read by future header bar + multi-node switcher.
    #[allow(dead_code)]
    api: Arc<ApiClient>,
    /// Watch / informer hub feeding screens.
    watch: BeeWatch,
    /// Top-bar reuses the health snapshot for the live ping
    /// indicator. Cheap clone of the watch receiver.
    health_rx: watch::Receiver<HealthSnapshot>,
    /// `Some(buf)` while the user is typing a `:command`. The
    /// buffer holds the characters typed *after* the leading colon.
    command_buffer: Option<String>,
    /// Status / error from the most recent `:command`, persisted on
    /// the command-bar line until the user enters command mode again.
    /// Cleared when `command_buffer` transitions to `Some`.
    command_status: Option<CommandStatus>,
}

/// Outcome from the most recently executed `:command`. Drives the
/// colour of the command-bar line in normal mode.
#[derive(Debug, Clone)]
pub enum CommandStatus {
    Info(String),
    Err(String),
}

/// Names the top-level screens. Index matches position in
/// [`App::screens`].
const SCREEN_NAMES: &[&str] = &[
    "Health", "Stamps", "Swap", "Lottery", "Peers", "Network", "Warmup", "API", "Tags",
];

#[derive(Default, Debug, Copy, Clone, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum Mode {
    #[default]
    Home,
}

impl App {
    pub fn new(tick_rate: f64, frame_rate: f64) -> color_eyre::Result<Self> {
        let (action_tx, action_rx) = mpsc::unbounded_channel();
        let config = Config::new()?;
        // Install the theme first so any tracing emitted during the
        // rest of `new` already reflects the operator's choice.
        theme::install(&config.ui);

        // Pick the active node profile and build an ApiClient for it.
        let node = config
            .active_node()
            .ok_or_else(|| eyre!("no Bee node configured (config.nodes is empty)"))?;
        let api = Arc::new(ApiClient::from_node(node)?);

        // Spawn the watch / informer hub. Pollers attach to children
        // of `root_cancel`, so quitting cancels everything in one go.
        let root_cancel = CancellationToken::new();
        let watch = BeeWatch::start(api.clone(), &root_cancel);
        let health_rx = watch.health();

        let screens = build_screens(&api, &watch);
        // S10 Command-log subscribes to the bee::http capture set up
        // by logging::init. If logging hasn't initialised the capture
        // (e.g. running in a test harness), the pane just shows
        // "waiting for first request…".
        let command_log: Box<dyn Component> = Box::new(CommandLog::new(log_capture::handle()));

        Ok(Self {
            tick_rate,
            frame_rate,
            screens,
            current_screen: 0,
            command_log,
            should_quit: false,
            should_suspend: false,
            config,
            mode: Mode::Home,
            last_tick_key_events: Vec::new(),
            action_tx,
            action_rx,
            root_cancel,
            api,
            watch,
            health_rx,
            command_buffer: None,
            command_status: None,
        })
    }

    pub async fn run(&mut self) -> color_eyre::Result<()> {
        let mut tui = Tui::new()?
            // .mouse(true) // uncomment this line to enable mouse support
            .tick_rate(self.tick_rate)
            .frame_rate(self.frame_rate);
        tui.enter()?;

        let tx = self.action_tx.clone();
        let cfg = self.config.clone();
        let size = tui.size()?;
        for component in self.iter_components_mut() {
            component.register_action_handler(tx.clone())?;
            component.register_config_handler(cfg.clone())?;
            component.init(size)?;
        }

        let action_tx = self.action_tx.clone();
        loop {
            self.handle_events(&mut tui).await?;
            self.handle_actions(&mut tui)?;
            if self.should_suspend {
                tui.suspend()?;
                action_tx.send(Action::Resume)?;
                action_tx.send(Action::ClearScreen)?;
                // tui.mouse(true);
                tui.enter()?;
            } else if self.should_quit {
                tui.stop()?;
                break;
            }
        }
        // Unwind every spawned task before tearing down the terminal.
        self.watch.shutdown();
        self.root_cancel.cancel();
        tui.exit()?;
        Ok(())
    }

    async fn handle_events(&mut self, tui: &mut Tui) -> color_eyre::Result<()> {
        let Some(event) = tui.next_event().await else {
            return Ok(());
        };
        let action_tx = self.action_tx.clone();
        let in_command_mode = self.command_buffer.is_some();
        match event {
            Event::Quit => action_tx.send(Action::Quit)?,
            Event::Tick => action_tx.send(Action::Tick)?,
            Event::Render => action_tx.send(Action::Render)?,
            Event::Resize(x, y) => action_tx.send(Action::Resize(x, y))?,
            Event::Key(key) => self.handle_key_event(key)?,
            _ => {}
        }
        // While the command bar is open we swallow key events at the
        // App level — components shouldn't react to typed letters.
        // Non-key events (Tick / Resize / Render) still propagate so
        // the screens keep refreshing under the prompt.
        let propagate = !(in_command_mode && matches!(event, Event::Key(_)));
        if propagate {
            for component in self.iter_components_mut() {
                if let Some(action) = component.handle_events(Some(event.clone()))? {
                    action_tx.send(action)?;
                }
            }
        }
        Ok(())
    }

    /// Iterate every component (screens + command-log strip) for
    /// uniform lifecycle ticks. Doesn't conflict with rendering,
    /// which only draws the active screen.
    fn iter_components_mut(&mut self) -> impl Iterator<Item = &mut Box<dyn Component>> {
        self.screens
            .iter_mut()
            .chain(std::iter::once(&mut self.command_log))
    }

    fn handle_key_event(&mut self, key: KeyEvent) -> color_eyre::Result<()> {
        // While a `:command` is being typed every key edits the
        // buffer or commits / cancels the line. No other keymap
        // applies.
        if self.command_buffer.is_some() {
            self.handle_command_mode_key(key)?;
            return Ok(());
        }
        let action_tx = self.action_tx.clone();
        // ':' opens the command bar.
        if matches!(
            key.code,
            crossterm::event::KeyCode::Char(':')
        ) {
            self.command_buffer = Some(String::new());
            self.command_status = None;
            return Ok(());
        }
        // Tab keeps working as a quick screen-cycle shortcut even
        // after the `:command` bar lands.
        if matches!(key.code, crossterm::event::KeyCode::Tab) {
            if !self.screens.is_empty() {
                self.current_screen = (self.current_screen + 1) % self.screens.len();
                debug!(
                    "switched to screen {}",
                    SCREEN_NAMES.get(self.current_screen).unwrap_or(&"?")
                );
            }
            return Ok(());
        }
        let Some(keymap) = self.config.keybindings.0.get(&self.mode) else {
            return Ok(());
        };
        match keymap.get(&vec![key]) {
            Some(action) => {
                info!("Got action: {action:?}");
                action_tx.send(action.clone())?;
            }
            _ => {
                // If the key was not handled as a single key action,
                // then consider it for multi-key combinations.
                self.last_tick_key_events.push(key);

                // Check for multi-key combinations
                if let Some(action) = keymap.get(&self.last_tick_key_events) {
                    info!("Got action: {action:?}");
                    action_tx.send(action.clone())?;
                }
            }
        }
        Ok(())
    }

    fn handle_command_mode_key(&mut self, key: KeyEvent) -> color_eyre::Result<()> {
        use crossterm::event::KeyCode;
        let buf = match self.command_buffer.as_mut() {
            Some(b) => b,
            None => return Ok(()),
        };
        match key.code {
            KeyCode::Esc => {
                // Cancel without dispatching.
                self.command_buffer = None;
            }
            KeyCode::Enter => {
                let line = std::mem::take(buf);
                self.command_buffer = None;
                self.execute_command(&line)?;
            }
            KeyCode::Backspace => {
                buf.pop();
            }
            KeyCode::Char(c) => {
                buf.push(c);
            }
            _ => {}
        }
        Ok(())
    }

    /// Resolve a `:command` token to the action it represents.
    /// Empty input is a silent no-op (operator typed `:` then Enter).
    fn execute_command(&mut self, line: &str) -> color_eyre::Result<()> {
        let trimmed = line.trim();
        if trimmed.is_empty() {
            return Ok(());
        }
        let head = trimmed.split_whitespace().next().unwrap_or("");
        match head {
            "q" | "quit" => {
                self.action_tx.send(Action::Quit)?;
                self.command_status = Some(CommandStatus::Info("quitting".into()));
            }
            "diagnose" | "diag" => {
                self.command_status = Some(match self.export_diagnostic_bundle() {
                    Ok(path) => CommandStatus::Info(format!(
                        "diagnostic bundle exported to {}",
                        path.display()
                    )),
                    Err(e) => CommandStatus::Err(format!("diagnose failed: {e}")),
                });
            }
            "context" | "ctx" => {
                let target = trimmed.split_whitespace().nth(1).unwrap_or("");
                if target.is_empty() {
                    let known: Vec<String> = self
                        .config
                        .nodes
                        .iter()
                        .map(|n| n.name.clone())
                        .collect();
                    self.command_status = Some(CommandStatus::Err(format!(
                        "usage: :context <name>  (known: {})",
                        known.join(", ")
                    )));
                    return Ok(());
                }
                self.command_status = Some(match self.switch_context(target) {
                    Ok(()) => CommandStatus::Info(format!(
                        "switched to context {target} ({})",
                        self.api.url
                    )),
                    Err(e) => CommandStatus::Err(format!("context switch failed: {e}")),
                });
            }
            screen if SCREEN_NAMES
                .iter()
                .any(|name| name.eq_ignore_ascii_case(screen)) =>
            {
                if let Some(idx) = SCREEN_NAMES
                    .iter()
                    .position(|name| name.eq_ignore_ascii_case(screen))
                {
                    self.current_screen = idx;
                    self.command_status =
                        Some(CommandStatus::Info(format!("→ {}", SCREEN_NAMES[idx])));
                }
            }
            other => {
                self.command_status = Some(CommandStatus::Err(format!(
                    "unknown command: {other:?} (try :health, :stamps, :swap, :lottery, :peers, :network, :warmup, :api, :diagnose, :quit)"
                )));
            }
        }
        Ok(())
    }

    /// Tear down the current watch hub and ApiClient, build a new
    /// connection against the named NodeConfig, and rebuild the
    /// screen list against fresh receivers. Component-internal state
    /// (Lottery's bench history, Network's reachability stability
    /// timer, etc.) is intentionally lost — a profile switch is a
    /// fresh slate, the same way it would be on app restart.
    fn switch_context(&mut self, target: &str) -> color_eyre::Result<()> {
        let node = self
            .config
            .nodes
            .iter()
            .find(|n| n.name == target)
            .ok_or_else(|| eyre!("no node configured with name {target:?}"))?
            .clone();
        let new_api = Arc::new(ApiClient::from_node(&node)?);
        // Cancel the current hub's children and let it drop. The new
        // hub spawns under the same root_cancel so quit-time teardown
        // still walks the whole tree in one go.
        self.watch.shutdown();
        let new_watch = BeeWatch::start(new_api.clone(), &self.root_cancel);
        let new_health_rx = new_watch.health();
        let new_screens = build_screens(&new_api, &new_watch);
        self.api = new_api;
        self.watch = new_watch;
        self.health_rx = new_health_rx;
        self.screens = new_screens;
        // Keep the same tab index so the operator stays on the
        // screen they were looking at — same data shape, new node.
        Ok(())
    }

    /// Build and persist a redacted diagnostic bundle to a file in
    /// the system temp directory. Designed to be paste-ready into a
    /// support thread (Discord, GitHub issue) without leaking
    /// auth tokens — URLs are reduced to their path component, since
    /// Bearer tokens live in headers, not URLs.
    fn export_diagnostic_bundle(&self) -> std::io::Result<PathBuf> {
        let bundle = self.render_diagnostic_bundle();
        let secs = SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .map(|d| d.as_secs())
            .unwrap_or(0);
        let path = std::env::temp_dir().join(format!("bee-tui-diagnostic-{secs}.txt"));
        std::fs::write(&path, bundle)?;
        Ok(path)
    }

    fn render_diagnostic_bundle(&self) -> String {
        let now = format_utc_now();
        let health = self.health_rx.borrow().clone();
        let topology = self.watch.topology().borrow().clone();
        let gates = Health::gates_for(&health, Some(&topology));
        let recent: Vec<_> = log_capture::handle()
            .map(|c| {
                let mut snap = c.snapshot();
                let len = snap.len();
                if len > 50 {
                    snap.drain(0..len - 50);
                }
                snap
            })
            .unwrap_or_default();

        let mut out = String::new();
        out.push_str("# bee-tui diagnostic bundle\n");
        out.push_str(&format!("# generated UTC {now}\n\n"));
        out.push_str("## profile\n");
        out.push_str(&format!("  name      {}\n", self.api.name));
        out.push_str(&format!("  endpoint  {}\n\n", self.api.url));
        out.push_str("## health gates\n");
        for g in &gates {
            out.push_str(&format_gate_line(g));
        }
        out.push_str("\n## last API calls (path only — Bearer tokens, if any, live in headers and aren't captured)\n");
        for e in &recent {
            let status = e.status.map(|s| s.to_string()).unwrap_or_else(|| "—".into());
            let elapsed = e
                .elapsed_ms
                .map(|ms| format!("{ms}ms"))
                .unwrap_or_else(|| "—".into());
            out.push_str(&format!(
                "  {ts} {method:<5} {path:<32} {status:>4} {elapsed:>7}\n",
                ts = e.ts,
                method = e.method,
                path = path_only(&e.url),
                status = status,
                elapsed = elapsed,
            ));
        }
        out.push_str(&format!(
            "\n## generated by bee-tui {}\n",
            env!("CARGO_PKG_VERSION"),
        ));
        out
    }

    fn handle_actions(&mut self, tui: &mut Tui) -> color_eyre::Result<()> {
        while let Ok(action) = self.action_rx.try_recv() {
            if action != Action::Tick && action != Action::Render {
                debug!("{action:?}");
            }
            match action {
                Action::Tick => {
                    self.last_tick_key_events.drain(..);
                }
                Action::Quit => self.should_quit = true,
                Action::Suspend => self.should_suspend = true,
                Action::Resume => self.should_suspend = false,
                Action::ClearScreen => tui.terminal.clear()?,
                Action::Resize(w, h) => self.handle_resize(tui, w, h)?,
                Action::Render => self.render(tui)?,
                _ => {}
            }
            let tx = self.action_tx.clone();
            for component in self.iter_components_mut() {
                if let Some(action) = component.update(action.clone())? {
                    tx.send(action)?
                };
            }
        }
        Ok(())
    }

    fn handle_resize(&mut self, tui: &mut Tui, w: u16, h: u16) -> color_eyre::Result<()> {
        tui.resize(Rect::new(0, 0, w, h))?;
        self.render(tui)?;
        Ok(())
    }

    fn render(&mut self, tui: &mut Tui) -> color_eyre::Result<()> {
        let active = self.current_screen;
        let tx = self.action_tx.clone();
        let screens = &mut self.screens;
        let command_log = &mut self.command_log;
        let command_buffer = self.command_buffer.clone();
        let command_status = self.command_status.clone();
        let profile = self.api.name.clone();
        let endpoint = self.api.url.clone();
        let last_ping = self.health_rx.borrow().last_ping;
        let now_utc = format_utc_now();
        tui.draw(|frame| {
            use ratatui::layout::{Constraint, Layout};
            use ratatui::style::{Color, Modifier, Style};
            use ratatui::text::{Line, Span};
            use ratatui::widgets::Paragraph;

            let chunks = Layout::vertical([
                Constraint::Length(2), // top-bar (metadata + tabs)
                Constraint::Min(0),    // active screen
                Constraint::Length(1), // command bar / status line
                Constraint::Length(8), // command-log strip
            ])
            .split(frame.area());

            let top_chunks =
                Layout::vertical([Constraint::Length(1), Constraint::Length(1)])
                    .split(chunks[0]);

            // Metadata line: profile · endpoint · ping · clock.
            let ping_str = match last_ping {
                Some(d) => format!("{}ms", d.as_millis()),
                None => "—".into(),
            };
            let t = theme::active();
            let metadata_line = Line::from(vec![
                Span::styled(
                    " bee-tui ",
                    Style::default()
                        .fg(Color::Black)
                        .bg(t.info)
                        .add_modifier(Modifier::BOLD),
                ),
                Span::raw("  "),
                Span::styled(
                    profile,
                    Style::default().fg(t.accent).add_modifier(Modifier::BOLD),
                ),
                Span::styled(
                    format!(" @ {endpoint}"),
                    Style::default().fg(t.dim),
                ),
                Span::raw("   "),
                Span::styled("ping ", Style::default().fg(t.dim)),
                Span::styled(ping_str, Style::default().fg(t.info)),
                Span::raw("   "),
                Span::styled(format!("UTC {now_utc}"), Style::default().fg(t.dim)),
            ]);
            frame.render_widget(Paragraph::new(metadata_line), top_chunks[0]);

            // Tab strip with the active screen highlighted.
            let theme = *theme::active();
            let mut tabs = Vec::with_capacity(SCREEN_NAMES.len() * 2);
            for (i, name) in SCREEN_NAMES.iter().enumerate() {
                let style = if i == active {
                    Style::default()
                        .fg(theme.tab_active_fg)
                        .bg(theme.tab_active_bg)
                        .add_modifier(Modifier::BOLD)
                } else {
                    Style::default().fg(theme.dim)
                };
                tabs.push(Span::styled(format!(" {name} "), style));
                tabs.push(Span::raw(" "));
            }
            tabs.push(Span::styled(
                ":cmd · Tab to cycle",
                Style::default().fg(theme.dim),
            ));
            frame.render_widget(Paragraph::new(Line::from(tabs)), top_chunks[1]);

            // Active screen
            if let Some(screen) = screens.get_mut(active) {
                if let Err(err) = screen.draw(frame, chunks[1]) {
                    let _ = tx.send(Action::Error(format!("Failed to draw screen: {err:?}")));
                }
            }
            // Command bar / status line
            let prompt = if let Some(buf) = &command_buffer {
                Line::from(vec![
                    Span::styled(
                        ":",
                        Style::default()
                            .fg(t.accent)
                            .add_modifier(Modifier::BOLD),
                    ),
                    Span::styled(buf.clone(), Style::default().add_modifier(Modifier::BOLD)),
                    Span::styled("█", Style::default().fg(t.accent)),
                ])
            } else {
                match &command_status {
                    Some(CommandStatus::Info(msg)) => {
                        Line::from(Span::styled(msg.clone(), Style::default().fg(t.pass)))
                    }
                    Some(CommandStatus::Err(msg)) => {
                        Line::from(Span::styled(msg.clone(), Style::default().fg(t.fail)))
                    }
                    None => Line::from(""),
                }
            };
            frame.render_widget(Paragraph::new(prompt), chunks[2]);

            // Command-log strip
            if let Err(err) = command_log.draw(frame, chunks[3]) {
                let _ = tx.send(Action::Error(format!("Failed to draw log: {err:?}")));
            }
        })?;
        Ok(())
    }
}

/// Construct the eight v0.3 screens with receivers from the supplied
/// hub. Extracted so `App::new` and the `:context` profile-switcher
/// can share the wiring — the screen list is the same on every
/// connection, only the underlying watch hub changes.
///
/// Order matters — the [`SCREEN_NAMES`] table assumes index 0 is
/// Health, 1 is Stamps, 2 is Swap, 3 is Lottery, 4 is Peers, 5 is
/// Network, 6 is Warmup, 7 is API, 8 is Tags.
fn build_screens(api: &Arc<ApiClient>, watch: &BeeWatch) -> Vec<Box<dyn Component>> {
    let health = Health::new(api.clone(), watch.health(), watch.topology());
    let stamps = Stamps::new(watch.stamps());
    let swap = Swap::new(watch.swap());
    let lottery = Lottery::new(api.clone(), watch.health(), watch.lottery());
    let peers = Peers::new(watch.topology());
    let network = Network::new(watch.network(), watch.topology());
    let warmup = Warmup::new(watch.health(), watch.stamps(), watch.topology());
    let api_health = ApiHealth::new(
        api.clone(),
        watch.health(),
        watch.transactions(),
        log_capture::handle(),
    );
    let tags = Tags::new(watch.tags());
    vec![
        Box::new(health),
        Box::new(stamps),
        Box::new(swap),
        Box::new(lottery),
        Box::new(peers),
        Box::new(network),
        Box::new(warmup),
        Box::new(api_health),
        Box::new(tags),
    ]
}

fn format_gate_line(g: &Gate) -> String {
    let glyph = match g.status {
        GateStatus::Pass => "✓",
        GateStatus::Warn => "⚠",
        GateStatus::Fail => "✗",
        GateStatus::Unknown => "·",
    };
    let mut s = format!("  [{glyph}] {label:<28} {value}\n", label = g.label, value = g.value);
    if let Some(why) = &g.why {
        s.push_str(&format!("        └─ {why}\n"));
    }
    s
}

/// Strip scheme + host from a URL, leaving only the path + query.
/// Mirrors the redaction the S10 command-log pane applies on render.
fn path_only(url: &str) -> String {
    if let Some(idx) = url.find("//") {
        let after_scheme = &url[idx + 2..];
        if let Some(slash) = after_scheme.find('/') {
            return after_scheme[slash..].to_string();
        }
        return "/".into();
    }
    url.to_string()
}

/// Format the current wall-clock UTC time as `HH:MM:SS`. We compute
/// from `SystemTime::now()` directly so the binary stays free of a
/// chrono / time dep just for this one display string.
fn format_utc_now() -> String {
    let secs = SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .map(|d| d.as_secs())
        .unwrap_or(0);
    let secs_in_day = secs % 86_400;
    let h = secs_in_day / 3_600;
    let m = (secs_in_day % 3_600) / 60;
    let s = secs_in_day % 60;
    format!("{h:02}:{m:02}:{s:02}")
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn format_utc_now_returns_eight_chars() {
        let s = format_utc_now();
        assert_eq!(s.len(), 8);
        assert_eq!(s.chars().nth(2), Some(':'));
        assert_eq!(s.chars().nth(5), Some(':'));
    }

    #[test]
    fn path_only_strips_scheme_and_host() {
        assert_eq!(
            path_only("http://10.0.1.5:1633/status"),
            "/status"
        );
        assert_eq!(
            path_only("https://bee.example.com/stamps?limit=10"),
            "/stamps?limit=10"
        );
    }

    #[test]
    fn path_only_handles_no_path() {
        assert_eq!(path_only("http://localhost:1633"), "/");
    }

    #[test]
    fn path_only_passes_relative_through() {
        assert_eq!(path_only("/already/relative"), "/already/relative");
    }
}