// thalamus_screen.rs — F5: presence, idle state, and channel status
//
// Shows idle state from the in-process thalamus (no subprocess spawn),
// then channel daemon status from cached data.

use ratatui::{
    layout::Rect,
    style::{Color, Style},
    text::{Line, Span},
    widgets::{Block, Borders, Paragraph, Wrap},
    Frame,
};

use super::{App, SCREEN_LEGEND};

impl App {
    pub(crate) fn draw_thalamus(&self, frame: &mut Frame, size: Rect) {
        let section = Style::default().fg(Color::Yellow);
        let dim = Style::default().fg(Color::DarkGray);
        let mut lines: Vec<Line> = Vec::new();

        // Presence / idle state from in-process thalamus
        lines.push(Line::styled("── Presence ──", section));
        lines.push(Line::raw(""));

        if let Some(ref idle) = self.idle_info {
            let presence = if idle.user_present {
                Span::styled("present", Style::default().fg(Color::Green))
            } else {
                Span::styled("away", Style::default().fg(Color::DarkGray))
            };
            lines.push(Line::from(vec![
                Span::raw("  User: "),
                presence,
                Span::raw(format!("  (last {:.0}s ago)", idle.since_activity)),
            ]));
            lines.push(Line::raw(format!("  Activity: {:.1}%", idle.activity_ewma * 100.0)));
            lines.push(Line::raw(format!("  Idle state: {}", idle.block_reason)));

            if idle.dreaming {
                lines.push(Line::styled("  ◆ dreaming", Style::default().fg(Color::Magenta)));
            }
            if idle.sleeping {
                lines.push(Line::styled("  ◆ sleeping", Style::default().fg(Color::Blue)));
            }
        } else {
            lines.push(Line::styled("  not initialized", dim));
        }
        lines.push(Line::raw(""));

        // Sampling parameters (↑/↓ select, ←/→ adjust)
        lines.push(Line::styled("── Sampling (←/→ adjust) ──", section));
        lines.push(Line::raw(""));
        let params = [
            format!("temperature: {:.2}", self.temperature),
            format!("top_p:       {:.2}", self.top_p),
            format!("top_k:       {}", self.top_k),
        ];
        for (i, label) in params.iter().enumerate() {
            let prefix = if i == self.sampling_selected { "▸ " } else { "  " };
            let style = if i == self.sampling_selected {
                Style::default().fg(Color::Cyan)
            } else {
                Style::default()
            };
            lines.push(Line::styled(format!("{}{}", prefix, label), style));
        }
        lines.push(Line::raw(""));

        // Channel status from cached data
        lines.push(Line::styled("── Channels ──", section));
        lines.push(Line::raw(""));

        if self.channel_status.is_empty() {
            lines.push(Line::styled("  no channels configured", dim));
        } else {
            for ch in &self.channel_status {
                let (symbol, color) = if ch.connected {
                    ("●", Color::Green)
                } else {
                    ("○", Color::Red)
                };

                let unread_str = if ch.unread > 0 {
                    format!("  ({} unread)", ch.unread)
                } else {
                    String::new()
                };

                lines.push(Line::from(vec![
                    Span::raw("  "),
                    Span::styled(symbol, Style::default().fg(color)),
                    Span::raw(format!(" {:<24}", ch.name)),
                    Span::styled(
                        if ch.connected { "connected" } else { "disconnected" },
                        Style::default().fg(color),
                    ),
                    Span::styled(unread_str, Style::default().fg(Color::Yellow)),
                ]));
            }
        }

        let block = Block::default()
            .title_top(Line::from(SCREEN_LEGEND).left_aligned())
            .title_top(Line::from(" thalamus ").right_aligned())
            .borders(Borders::ALL)
            .border_style(Style::default().fg(Color::Cyan));

        let para = Paragraph::new(lines)
            .block(block)
            .wrap(Wrap { trim: false })
            .scroll((self.debug_scroll, 0));

        frame.render_widget(para, size);
    }
}