//! Workflow status panel rendering — agent cards with state badges.
//!
//! Flow: `draw_workflow_panel` reads `state.workflow_engine` and renders a
//! panel showing agent statuses, findings count, session counters, and
//! usage hints.
//!
//! Design: agents are shown as compact cards with state-colored badges.
//! The division pipeline mode adds a visual pipeline flow with arrows.

use ratatui::layout::Rect;
use ratatui::style::{Style, Modifier};
use ratatui::text::{Line, Span};
use ratatui::widgets::{Block, Borders, Paragraph, Wrap};
use ratatui::Frame;
use super::theme::Theme;
use crate::app::workflow::engine::AgentState;

/// Icons for agent states.
fn state_icon(state: AgentState) -> &'static str {
    match state {
        AgentState::Idle      => "○",
        AgentState::Running   => "▶",
        AgentState::Completed => "✓",
        AgentState::Failed    => "✗",
    }
}

fn state_label(state: AgentState) -> &'static str {
    match state {
        AgentState::Idle      => "Idle",
        AgentState::Running   => "Running",
        AgentState::Completed => "Done",
        AgentState::Failed    => "Failed",
    }
}

fn state_color(state: AgentState) -> Color {
    match state {
        AgentState::Idle      => Theme::TEXT_DIM,
        AgentState::Running   => Theme::WARNING,
        AgentState::Completed => Theme::SUCCESS,
        AgentState::Failed    => Theme::ERROR,
    }
}

/// Detect if the current workflow looks like a company pipeline.
fn is_company_pipeline(agents: &[crate::app::workflow::engine::WorkflowAgent]) -> bool {
    if agents.is_empty() {
        return false;
    }
    let division_keywords = ["Strategy", "Engineering", "Quality", "Security", "Documentation"];
    agents.iter().any(|a| {
        division_keywords.iter().any(|k| a.name.contains(k))
    })
}

/// Render the workflow status panel.
#[allow(clippy::too_many_lines)]
pub fn draw_workflow_panel(frame: &mut Frame, area: Rect, state: &crate::app::state::rest::AppStateRest) {
    use ratatui::layout::{Constraint, Direction, Layout};

    let is_company = is_company_pipeline(&state.workflow_engine.agents);

    let title = if is_company {
        Span::styled(" 🏢 Pipeline ", Style::default().fg(Theme::PRIMARY).add_modifier(Modifier::BOLD))
    } else {
        Span::styled(" ⚙ Workflow ", Style::default().fg(Theme::PRIMARY).add_modifier(Modifier::BOLD))
    };

    let block = Block::default()
        .borders(Borders::ALL)
        .border_style(Style::default().fg(Theme::BORDER))
        .title(title);

    let inner = block.inner(area);
    frame.render_widget(block, area);

    // Split inner into header and body
    let chunks = Layout::default()
        .direction(Direction::Vertical)
        .constraints([
            Constraint::Length(3),
            Constraint::Min(4),
        ])
        .split(inner);

    // ── Header area ──────────────────────────────────────────────────────
    let mut header_lines: Vec<Line> = Vec::new();

    if is_company {
        // Division pipeline overview
        let agents = &state.workflow_engine.agents;
        let mut pipe_spans: Vec<Span> = Vec::new();
        for (i, agent) in agents.iter().enumerate() {
            if i > 0 {
                pipe_spans.push(Span::styled(
                    "  ",
                    Style::default().fg(Theme::TEXT_DIM),
                ));
            }
            let icon = state_icon(agent.status.state);
            let color = state_color(agent.status.state);
            let modif = match agent.status.state {
                AgentState::Idle => Modifier::empty(),
                _ => Modifier::BOLD,
            };
            pipe_spans.push(Span::styled(
                format!("{} {} ", icon, agent.name.chars().take(10).collect::<String>()),
                Style::default().fg(color).add_modifier(modif),
            ));
            if i < agents.len().saturating_sub(1) {
                pipe_spans.push(Span::styled(
                    "→",
                    Style::default().fg(Theme::TEXT_DIM),
                ));
            }
        }
        header_lines.push(Line::from(pipe_spans));
        header_lines.push(Line::from(vec![
            Span::styled("Status: ", Style::default().fg(Theme::TEXT_DIM)),
            if state.turn_in_flight() {
                Span::styled("● Running", Style::default().fg(Theme::WARNING).add_modifier(Modifier::BOLD))
            } else {
                Span::styled("● Idle", Style::default().fg(Theme::SUCCESS))
            },
            Span::raw("  "),
            Span::styled(
                format!("Agents: {} | Findings: {}",
                    state.workflow_engine.agents.len(),
                    state.workflow_engine.findings.len(),
                ),
                Style::default().fg(Theme::TEXT_DIM),
            ),
        ]));
    } else {
        header_lines.push(Line::from(vec![
            Span::styled("/workflow run ", Style::default().fg(Theme::PRIMARY).add_modifier(Modifier::BOLD)),
            Span::styled("<prompt>", Style::default().fg(Theme::TEXT_DIM)),
            Span::styled("  ·  Esc to close", Style::default().fg(Theme::TEXT_DIM)),
        ]));
        header_lines.push(Line::from(vec![
            Span::styled("Status: ", Style::default().fg(Theme::TEXT_DIM)),
            if state.turn_in_flight() {
                Span::styled("● Running", Style::default().fg(Theme::WARNING).add_modifier(Modifier::BOLD))
            } else {
                Span::styled("● Idle", Style::default().fg(Theme::SUCCESS))
            },
            Span::raw("  "),
            Span::styled(
                format!("Agents: {} | Findings: {}",
                    state.workflow_engine.agents.len(),
                    state.workflow_engine.findings.len(),
                ),
                Style::default().fg(Theme::TEXT_DIM),
            ),
        ]));
    }

    let header = Paragraph::new(header_lines);
    frame.render_widget(header, chunks[0]);

    // ── Body: agent cards ────────────────────────────────────────────────
    if state.workflow_engine.agents.is_empty() {
        let session_lines = build_session_lines(state);
        let placeholder = Paragraph::new(session_lines).wrap(Wrap { trim: false });
        frame.render_widget(placeholder, chunks[1]);
    } else {
        let mut card_lines: Vec<Line> = Vec::new();
        for agent in &state.workflow_engine.agents {
            let color = state_color(agent.status.state);
            let icon = state_icon(agent.status.state);
            let label = state_label(agent.status.state);

            let duration_str = match (agent.status.started_at, agent.status.completed_at) {
                (Some(s), Some(e)) => format!(" {}ms", e.saturating_sub(s)),
                (Some(_), None)    => " (running)".to_string(),
                _                  => String::new(),
            };

            // Agent card header
            card_lines.push(Line::from(vec![
                Span::styled(
                    format!(" {icon} "),
                    Style::default().fg(color).add_modifier(Modifier::BOLD),
                ),
                Span::styled(
                    format!(" {}", agent.name),
                    Style::default().fg(Theme::TEXT).add_modifier(Modifier::BOLD),
                ),
                Span::styled(
                    format!(" [{label}]"),
                    Style::default().fg(color),
                ),
                Span::styled(
                    duration_str,
                    Style::default().fg(Theme::TEXT_DIM),
                ),
            ]));

            // Agent details (progress / error)
            if let Some(ref err) = agent.status.error {
                card_lines.push(Line::from(vec![
                    Span::styled("  ⚠ ", Style::default().fg(Theme::ERROR)),
                    Span::styled(err.clone(), Style::default().fg(Theme::ERROR)),
                ]));
            } else if let Some(ref prog) = agent.status.progress {
                card_lines.push(Line::from(vec![
                    Span::styled("  ", Style::default()),
                    Span::styled(prog.clone(), Style::default().fg(Theme::TEXT_DIM).add_modifier(Modifier::ITALIC)),
                ]));
            }

            // Card separator
            card_lines.push(Line::from(Span::raw("")));
        }

        let list = Paragraph::new(card_lines);
        frame.render_widget(list, chunks[1]);
    }
}

/// Build compact session info for the placeholder view.
fn build_session_lines(state: &crate::app::state::rest::AppStateRest) -> Vec<Line<'static>> {
    let mut lines: Vec<Line<'static>> = Vec::new();

    lines.push(Line::from(Span::styled(
        " No workflow running.",
        Style::default().fg(Theme::TEXT_DIM),
    )));
    lines.push(Line::from(Span::raw("")));

    if let Some(ref rt) = state.session_runtime {
        let tool_count   = rt.tool_call_results.len();
        let pending      = rt.pending_tool_queue.len();
        let bash_count   = rt.bash_jobs.len();
        let msg_count    = rt.messages.len();

        lines.push(Line::from(vec![
            Span::styled(" Messages  ", Style::default().fg(Theme::TEXT_DIM)),
            Span::styled(msg_count.to_string(), Style::default().fg(Theme::INFO).add_modifier(Modifier::BOLD)),
        ]));
        lines.push(Line::from(vec![
            Span::styled(" Tool calls", Style::default().fg(Theme::TEXT_DIM)),
            Span::styled(format!(" {tool_count}"), Style::default().fg(Theme::SUCCESS)),
        ]));
        if pending > 0 {
            lines.push(Line::from(vec![
                Span::styled(" Pending   ", Style::default().fg(Theme::TEXT_DIM)),
                Span::styled(format!(" {pending}"), Style::default().fg(Theme::WARNING)),
            ]));
        }
        if bash_count > 0 {
            lines.push(Line::from(vec![
                Span::styled(" Bash jobs ", Style::default().fg(Theme::TEXT_DIM)),
                Span::styled(format!(" {bash_count}"), Style::default().fg(Theme::WARNING)),
            ]));
        }
    } else {
        lines.push(Line::from(Span::styled(
            " (no active session)",
            Style::default().fg(Theme::TEXT_DIM),
        )));
    }

    lines.push(Line::from(Span::raw("")));
    lines.push(Line::from(Span::styled(
        " Complex tasks auto-delegate to the company pipeline.",
        Style::default().fg(Theme::TEXT_DIM).add_modifier(Modifier::ITALIC),
    )));

    lines
}

use ratatui::style::Color;