//! Workflow status panel rendering.
//!
//! Flow: `draw_workflow_panel` reads `state.session_runtime` and
//! `state.workflow_engine` and renders a compact `List` of counters
//! (messages, completed/pending tool calls, active bash jobs, agents,
//! findings) plus the current auto-run phase.
//!
//! Why: shows a placeholder panel when there is no active session
//! runtime, and only emits rows for counters that are nonzero, to keep
//! the panel compact during simple single-turn sessions.

use ratatui::layout::Rect;
use ratatui::style::{Style, Modifier};
use ratatui::text::{Line, Span};
use ratatui::widgets::{Block, Borders, List, ListItem};
use ratatui::Frame;
use super::theme::Theme;

/// Render the workflow status panel summarizing the active session runtime.
///
/// Flow: bail out with a "No active session" placeholder if
/// `state.session_runtime` is None → otherwise build a list of status
/// lines (message count, completed/pending tool calls, active bash jobs,
/// agent/finding counts, auto-run phase) → render as a List widget.
///
/// Why: rows for pending tool queue, bash jobs, agents, and findings are
/// only shown when their count is nonzero, to keep the panel compact
/// during simple single-turn sessions.
///
/// Return: nothing; draws directly into `frame` at `area`.
pub fn draw_workflow_panel(frame: &mut Frame, area: Rect, state: &crate::app::state::rest::AppStateRest) {
    let block = Block::default()
        .borders(Borders::ALL)
        .border_style(Style::default().fg(Theme::BORDER))
        .title(" Workflow ");

    let session_runtime = match &state.session_runtime {
        Some(r) => r,
        None => {
            let empty = Block::default().borders(Borders::ALL).title(" Workflow ");
            let paragraph = ratatui::widgets::Paragraph::new(Line::from(Span::raw("No active session")))
                .block(empty);
            frame.render_widget(paragraph, area);
            return;
        }
    };

    let tool_count = session_runtime.tool_call_results.len();
    let pending_count = session_runtime.pending_tool_queue.len();
    let bash_count = session_runtime.bash_jobs.len();

    let agent_count = state.workflow_engine.agents.len();
    let findings_count = state.workflow_engine.findings.len();

    let mut items = Vec::new();

    items.push(ListItem::new(Line::from(Span::styled(
        format!(" Messages: {}", session_runtime.messages.len()),
        Style::default().fg(Theme::TEXT),
    ))));

    items.push(ListItem::new(Line::from(Span::styled(
        format!(" Tool calls completed: {}", tool_count),
        Style::default().fg(Theme::SUCCESS),
    ))));

    if pending_count > 0 {
        items.push(ListItem::new(Line::from(Span::styled(
            format!(" Pending tool queue: {}", pending_count),
            Style::default().fg(Theme::WARNING),
        ))));
    }

    if bash_count > 0 {
        items.push(ListItem::new(Line::from(Span::styled(
            format!(" Active bash jobs: {}", bash_count),
            Style::default().fg(Theme::WARNING),
        ))));
    }

    if agent_count > 0 {
        items.push(ListItem::new(Line::from(Span::styled(
            format!(" Agents: {}", agent_count),
            Style::default().fg(Theme::INFO),
        ))));
    }

    if findings_count > 0 {
        items.push(ListItem::new(Line::from(Span::styled(
            format!(" Findings: {}", findings_count),
            Style::default().fg(Theme::WARNING),
        ))));
    }

    let phase_status = if state.turn_in_flight() {
        "Auto-running"
    } else {
        "Awaiting input"
    };

    items.push(ListItem::new(Line::from(Span::styled(
        format!(" Phase: {}", phase_status),
        Style::default().fg(Theme::PRIMARY),
    ))));

    let list = List::new(items)
        .block(block)
        .highlight_style(Style::default().add_modifier(Modifier::BOLD));

    frame.render_widget(list, area);
}