//! The Settings tab: federation settings, visualization scripts and status.

use ratatui::Frame;
use ratatui::layout::{Constraint, Layout, Rect};
use ratatui::style::{Color, Modifier, Style};
use ratatui::text::{Line, Span};
use ratatui::widgets::{Block, Paragraph};

use super::theme;
use crate::app::state::{AppState, DevicePresenceSection, FedRow, SimilarityRow, settings_rows};

pub fn draw(frame: &mut Frame, area: Rect, state: &AppState) {
    let block = Block::bordered()
        .title(" Settings ")
        .title_style(theme::header_for(state))
        .border_style(theme::border_for(state));
    let inner = block.inner(area);
    frame.render_widget(block, area);

    if inner.width >= 132 {
        let desired_settings_width = ((inner.width as usize * 44) / 100).clamp(68, 92) as u16;
        let settings_width = desired_settings_width.min(inner.width.saturating_sub(56));
        let [rows_area, _, status_area] = Layout::horizontal([
            Constraint::Length(settings_width),
            Constraint::Length(2),
            Constraint::Min(0),
        ])
        .areas(inner);

        draw_settings_rows(frame, rows_area, state);
        draw_status_column(frame, status_area, state);
        return;
    }

    let rows_height =
        (settings_rows(state).len() + 10 + device_presence_sections(state).len()) as u16;
    let [rows_area, _, status_area] = Layout::vertical([
        Constraint::Length(rows_height.min(inner.height)),
        Constraint::Length(1),
        Constraint::Min(0),
    ])
    .areas(inner);

    draw_settings_rows(frame, rows_area, state);
    draw_status_column(frame, status_area, state);
}

fn device_presence_sections(state: &AppState) -> Vec<DevicePresenceSection> {
    let Some(status) = &state.federation.devices else {
        return Vec::new();
    };
    let now = crate::app::state::unix_time_ms();
    let mut sections = Vec::new();
    for index in crate::app::state::device_status_order(state) {
        let Some(device) = status.devices.get(index) else {
            continue;
        };
        let section = crate::app::state::device_presence_section(state, device, now);
        if sections.last().copied() != Some(section) {
            sections.push(section);
        }
    }
    sections
}

fn draw_settings_rows(frame: &mut Frame, area: Rect, state: &AppState) {
    let settings = &state.federation.settings;
    let on_off = |on: bool| if on { "on" } else { "off" };
    let mut y = area.y;
    let mut cursor = 0usize;

    draw_section(frame, area, state, &mut y, "Library");
    draw_row(
        frame,
        area,
        state,
        &mut y,
        cursor,
        state.settings_cursor,
        "Music save directory",
        if state.music_dir_changing {
            format!("{} checking/changing…", state.spinner())
        } else {
            state.music_dir.to_string_lossy().into_owned()
        },
    );
    cursor += 1;

    y = y.saturating_add(1);

    draw_section(frame, area, state, &mut y, "Similarity Search");
    let similarity = &state.similarity.settings;
    for row in SimilarityRow::ALL {
        let (label, value) = match row {
            SimilarityRow::Toggle => ("Similarity search", on_off(similarity.enabled).to_string()),
            SimilarityRow::Model => (
                "Embedding model",
                crate::similarity::model_by_id(&similarity.model)
                    .map(|model| format!("{} · {}", model.id, model.license))
                    .unwrap_or_else(|| similarity.model.clone()),
            ),
            SimilarityRow::Profile => (
                "Preprocessing profile",
                format!("{} (enter for details)", similarity.profile),
            ),
            SimilarityRow::Workers => ("Background workers", similarity.workers.to_string()),
            SimilarityRow::Clear => ("Clear all stored embeddings", "↵".to_string()),
        };
        draw_row(
            frame,
            area,
            state,
            &mut y,
            cursor,
            state.settings_cursor,
            label,
            value,
        );
        cursor += 1;
    }

    y = y.saturating_add(1);

    draw_section(frame, area, state, &mut y, "Federation");
    for row in FedRow::ALL {
        let (label, value) = match row {
            FedRow::Toggle => ("Federation", on_off(settings.enabled).to_string()),
            FedRow::NetworkId => (
                "Network ID",
                if settings.network_id.is_empty() {
                    "(not set — press enter)".to_string()
                } else {
                    settings.network_id.clone()
                },
            ),
            FedRow::SaveOnListen => (
                "Save federated tracks to the library on listen",
                on_off(settings.save_on_listen).to_string(),
            ),
            FedRow::SyncNow => (
                "Publish the library now",
                if state.federation.publishing {
                    format!("{} publishing", state.spinner())
                } else {
                    "↵".to_string()
                },
            ),
            FedRow::ShowTicket => ("Show my connection ticket", "↵".to_string()),
            FedRow::Connect => ("Connect to a peer by ticket…", "↵".to_string()),
        };
        draw_row(
            frame,
            area,
            state,
            &mut y,
            cursor,
            state.settings_cursor,
            label,
            value,
        );
        cursor += 1;
    }

    y = y.saturating_add(1);
    let connected_devices_enabled = state.connected_devices_enabled();
    draw_section(frame, area, state, &mut y, "Connected Devices");
    let disabled_value = "enable federation first".to_string();
    let devices = state.federation.devices.as_ref();
    draw_row_enabled(
        frame,
        area,
        state,
        &mut y,
        cursor,
        state.settings_cursor,
        "This device name",
        if connected_devices_enabled {
            devices
                .map(|status| status.this_device_name.clone())
                .unwrap_or_else(|| "loading…".to_string())
        } else {
            disabled_value.clone()
        },
        connected_devices_enabled,
    );
    cursor += 1;
    draw_row_enabled(
        frame,
        area,
        state,
        &mut y,
        cursor,
        state.settings_cursor,
        "Generate device invite",
        if connected_devices_enabled {
            "↵".to_string()
        } else {
            disabled_value.clone()
        },
        connected_devices_enabled,
    );
    cursor += 1;
    draw_row_enabled(
        frame,
        area,
        state,
        &mut y,
        cursor,
        state.settings_cursor,
        "Connect device by invite…",
        if connected_devices_enabled {
            "↵".to_string()
        } else {
            disabled_value.clone()
        },
        connected_devices_enabled,
    );
    cursor += 1;
    draw_row_enabled(
        frame,
        area,
        state,
        &mut y,
        cursor,
        state.settings_cursor,
        "Sync devices now",
        if connected_devices_enabled {
            if state.federation.device_syncing {
                format!("{} syncing", state.spinner())
            } else {
                "↵".to_string()
            }
        } else {
            disabled_value.clone()
        },
        connected_devices_enabled,
    );
    cursor += 1;
    draw_row_enabled(
        frame,
        area,
        state,
        &mut y,
        cursor,
        state.settings_cursor,
        "Leave device group",
        if connected_devices_enabled {
            "↵".to_string()
        } else {
            disabled_value.clone()
        },
        connected_devices_enabled,
    );
    cursor += 1;
    if let Some(status) = devices {
        let now = crate::app::state::unix_time_ms();
        let mut current_section = None;
        for index in crate::app::state::device_status_order(state) {
            let Some(device) = status.devices.get(index) else {
                continue;
            };
            let section = crate::app::state::device_presence_section(state, device, now);
            if current_section != Some(section) {
                draw_subsection(frame, area, &mut y, section.title());
                current_section = Some(section);
            }
            let name = crate::app::state::device_display_name(device);
            let label = if device.is_self {
                format!("* {name}")
            } else if device.revoked {
                format!("  {name} (revoked)")
            } else {
                format!("  {name}")
            };
            let version = if device.client_version.is_empty() {
                "unknown".to_string()
            } else {
                format!("v{}", device.client_version)
            };
            let can_revoke = connected_devices_enabled && !device.is_self && !device.revoked;
            let presence = match section {
                DevicePresenceSection::Online => "online",
                DevicePresenceSection::Offline => "offline",
                DevicePresenceSection::Revoked => "revoked",
            };
            let value = if can_revoke {
                format!("{version} · {presence} · revoke ↵")
            } else if connected_devices_enabled {
                format!("{version} · {presence}")
            } else {
                disabled_value.clone()
            };
            draw_row_enabled(
                frame,
                area,
                state,
                &mut y,
                cursor,
                state.settings_cursor,
                &label,
                value,
                connected_devices_enabled,
            );
            cursor += 1;
        }
    }

    y = y.saturating_add(1);
    draw_section(frame, area, state, &mut y, "Visualizations");
    draw_row(
        frame,
        area,
        state,
        &mut y,
        cursor,
        state.settings_cursor,
        "Show clock",
        if state.visualizer.config.show_clock {
            "[x]".to_string()
        } else {
            "[ ]".to_string()
        },
    );
    cursor += 1;

    for (index, script) in state.visualizer.scripts.iter().enumerate() {
        let selected_script = state
            .visualizer
            .selected_script_index()
            .is_some_and(|selected| selected == index);
        let label = if selected_script {
            format!("* {}", script.name)
        } else {
            format!("  {}", script.name)
        };
        let value = script
            .path
            .file_name()
            .and_then(|name| name.to_str())
            .unwrap_or("")
            .to_string();
        draw_row(
            frame,
            area,
            state,
            &mut y,
            cursor,
            state.settings_cursor,
            &label,
            value,
        );
        cursor += 1;
    }

    draw_row(
        frame,
        area,
        state,
        &mut y,
        cursor,
        state.settings_cursor,
        "+ New visualization script",
        "↵".to_string(),
    );
    cursor += 1;

    if state.visualizer.selected_script().is_some() {
        draw_row(
            frame,
            area,
            state,
            &mut y,
            cursor,
            state.settings_cursor,
            "Edit selected visualization",
            "↵".to_string(),
        );
        cursor += 1;
    }

    y = y.saturating_add(1);
    draw_row(
        frame,
        area,
        state,
        &mut y,
        cursor,
        state.settings_cursor,
        "Full status details",
        "enter".to_string(),
    );
}

fn protocol_label(id: &str) -> &str {
    match id {
        "federation_net" => "Federation transport",
        "ticket" => "Peer ticket",
        "rendezvous" => "Rendezvous",
        "music_dht" => "Music DHT",
        "catalog" => "Catalog",
        "audio" => "Audio transfer",
        "similarity" => "Similarity search",
        "device_sync" => "Device sync",
        "jam" => "Jam",
        other => other,
    }
}

fn draw_section(frame: &mut Frame, area: Rect, state: &AppState, y: &mut u16, title: &'static str) {
    if *y >= area.y + area.height {
        return;
    }
    let rect = Rect {
        x: area.x,
        y: *y,
        width: area.width,
        height: 1,
    };
    frame.render_widget(
        Paragraph::new(Line::styled(title, theme::header_for(state))),
        rect,
    );
    *y = (*y).saturating_add(1);
}

fn draw_subsection(frame: &mut Frame, area: Rect, y: &mut u16, title: &'static str) {
    if *y >= area.y + area.height {
        return;
    }
    let rect = Rect {
        x: area.x,
        y: *y,
        width: area.width,
        height: 1,
    };
    frame.render_widget(
        Paragraph::new(Line::from(vec![
            Span::raw("  "),
            Span::styled(title, theme::dim()),
        ])),
        rect,
    );
    *y = (*y).saturating_add(1);
}

fn draw_row(
    frame: &mut Frame,
    area: Rect,
    state: &AppState,
    y: &mut u16,
    row_index: usize,
    cursor: usize,
    label: &str,
    value: String,
) {
    draw_row_enabled(frame, area, state, y, row_index, cursor, label, value, true);
}

fn draw_row_enabled(
    frame: &mut Frame,
    area: Rect,
    state: &AppState,
    y: &mut u16,
    row_index: usize,
    cursor: usize,
    label: &str,
    value: String,
    enabled: bool,
) {
    if *y >= area.y + area.height {
        return;
    }
    let selected = row_index == cursor;
    let rect = Rect {
        x: area.x,
        y: *y,
        width: area.width,
        height: 1,
    };
    let marker = if selected { "▶ " } else { "  " };
    let label_width = settings_label_width(area.width);
    let line = Line::from(vec![
        Span::styled(
            marker,
            if enabled {
                theme::accent_for(state)
            } else {
                theme::dim()
            },
        ),
        Span::styled(
            format!("{label:<label_width$}"),
            if !enabled {
                theme::dim()
            } else if selected {
                theme::accent_for(state)
            } else {
                ratatui::style::Style::default()
            },
        ),
        Span::styled(value, theme::dim()),
    ]);
    frame.render_widget(Paragraph::new(line), rect);
    *y = (*y).saturating_add(1);
}

fn settings_label_width(width: u16) -> usize {
    let width = width as usize;
    if width >= 88 {
        48
    } else {
        width.saturating_sub(28).clamp(24, 48)
    }
}

fn status_line(label: &str, value: String) -> Line<'static> {
    Line::from(vec![
        Span::styled(format!("{label:<18}"), theme::dim()),
        Span::raw(value),
    ])
}

fn short_bytes_label(bytes: u64) -> String {
    if bytes >= 1024 * 1024 {
        format!("{:.1} MiB", bytes as f64 / 1024.0 / 1024.0)
    } else if bytes >= 1024 {
        format!("{:.1} KiB", bytes as f64 / 1024.0)
    } else {
        format!("{bytes} B")
    }
}

fn rtt_label(ms: Option<u64>) -> String {
    ms.map(|ms| format!("{ms} ms"))
        .unwrap_or_else(|| "rtt n/a".to_string())
}

fn short_id(id: &str) -> String {
    id.chars().take(12).collect::<String>() + "…"
}

fn draw_status_column(frame: &mut Frame, area: Rect, state: &AppState) {
    if area.height < 12 {
        draw_status(frame, area, state);
        return;
    }
    let [similarity_area, _, federation_area] = Layout::vertical([
        Constraint::Length(8),
        Constraint::Length(1),
        Constraint::Min(0),
    ])
    .areas(area);
    draw_similarity_status(frame, similarity_area, state);
    draw_status(frame, federation_area, state);
}

fn draw_similarity_status(frame: &mut Frame, area: Rect, state: &AppState) {
    let status = &state.similarity.status;
    let progress = if status.total_tracks == 0 {
        "0 / 0".to_string()
    } else {
        format!("{} / {}", status.completed_tracks, status.total_tracks)
    };
    let active = status
        .active_profile
        .as_deref()
        .map(short_id)
        .unwrap_or_else(|| "not ready".to_string());
    let target = status
        .target_profile
        .as_deref()
        .map(short_id)
        .unwrap_or_else(|| "—".to_string());
    draw_summary_card(
        frame,
        area,
        state,
        " Similarity Processing ",
        vec![
            status_line("State", status.phase.label().to_string()),
            status_line("Progress", progress),
            status_line("Active", active),
            status_line("Processing", target),
            status_line(
                "Stored",
                format!(
                    "{} vectors / {}",
                    status.stored_vectors,
                    short_bytes_label(status.stored_bytes)
                ),
            ),
            status_line(
                "Current / errors",
                status
                    .current_track
                    .clone()
                    .or_else(|| status.last_error.clone())
                    .unwrap_or_else(|| format!("{} errors", status.failed_tracks)),
            ),
        ],
    );
}

fn draw_status(frame: &mut Frame, area: Rect, state: &AppState) {
    if area.width == 0 || area.height == 0 {
        return;
    }

    if area.height < 15 || area.width < 36 {
        frame.render_widget(
            Paragraph::new(compact_status_lines(state))
                .wrap(ratatui::widgets::Wrap { trim: false }),
            area,
        );
        return;
    }

    if area.width >= 60 && area.height >= 20 {
        let protocols_height =
            protocol_card_height(state, area.width.saturating_sub(2), area.height);
        let [top_area, _, bottom_area, _, protocols_area, _] = Layout::vertical([
            Constraint::Length(7),
            Constraint::Length(1),
            Constraint::Length(7),
            Constraint::Length(1),
            Constraint::Length(protocols_height),
            Constraint::Min(0),
        ])
        .areas(area);
        let [status_area, _, local_area] = Layout::horizontal([
            Constraint::Percentage(50),
            Constraint::Length(1),
            Constraint::Percentage(50),
        ])
        .areas(top_area);
        let [transport_area, _, devices_area] = Layout::horizontal([
            Constraint::Percentage(50),
            Constraint::Length(1),
            Constraint::Percentage(50),
        ])
        .areas(bottom_area);
        draw_summary_card(
            frame,
            status_area,
            state,
            " Status ",
            node_summary_lines(state),
        );
        draw_summary_card(
            frame,
            local_area,
            state,
            " Local Data ",
            local_data_summary_lines(state),
        );
        draw_summary_card(
            frame,
            transport_area,
            state,
            " Iroh Transport ",
            transport_summary_lines(state),
        );
        draw_summary_card(
            frame,
            devices_area,
            state,
            " Connected Devices ",
            device_summary_lines(state),
        );
        draw_summary_card(
            frame,
            protocols_area,
            state,
            " Protocol Versions ",
            protocol_summary_lines(state, protocols_area.width.saturating_sub(2)),
        );
        return;
    }

    if area.height < 39 {
        frame.render_widget(
            Paragraph::new(compact_status_lines(state))
                .wrap(ratatui::widgets::Wrap { trim: false }),
            area,
        );
        return;
    }

    let [
        node_area,
        _,
        transport_area,
        _,
        devices_area,
        _,
        local_area,
        _,
        protocols_area,
        _,
    ] = Layout::vertical([
        Constraint::Length(7),
        Constraint::Length(1),
        Constraint::Length(7),
        Constraint::Length(1),
        Constraint::Length(7),
        Constraint::Length(1),
        Constraint::Length(7),
        Constraint::Length(1),
        Constraint::Length(protocol_card_height(
            state,
            area.width.saturating_sub(2),
            area.height,
        )),
        Constraint::Min(0),
    ])
    .areas(area);

    draw_summary_card(
        frame,
        node_area,
        state,
        " Status ",
        node_summary_lines(state),
    );
    draw_summary_card(
        frame,
        transport_area,
        state,
        " Iroh Transport ",
        transport_summary_lines(state),
    );
    draw_summary_card(
        frame,
        devices_area,
        state,
        " Connected Devices ",
        device_summary_lines(state),
    );
    draw_summary_card(
        frame,
        local_area,
        state,
        " Local Data ",
        local_data_summary_lines(state),
    );
    draw_summary_card(
        frame,
        protocols_area,
        state,
        " Protocol Versions ",
        protocol_summary_lines(state, protocols_area.width.saturating_sub(2)),
    );
}

fn compact_status_lines(state: &AppState) -> Vec<Line<'static>> {
    let mut lines = Vec::new();
    lines.push(Line::styled("Status", theme::header_for(state)));
    lines.extend(node_summary_lines(state).into_iter().take(2));
    lines.push(Line::default());
    lines.push(Line::styled("Local Data", theme::header_for(state)));
    lines.extend(local_data_summary_lines(state).into_iter().take(3));
    lines.push(Line::default());
    lines.push(Line::styled("Iroh Transport", theme::header_for(state)));
    lines.extend(transport_summary_lines(state).into_iter().take(2));
    lines.push(Line::default());
    lines.push(Line::styled("Connected Devices", theme::header_for(state)));
    lines.extend(device_summary_lines(state).into_iter().take(2));
    lines.push(Line::default());
    lines.push(Line::styled("Protocol Versions", theme::header_for(state)));
    lines.extend(protocol_summary_lines(state, 0).into_iter().take(3));
    lines
}

fn draw_summary_card(
    frame: &mut Frame,
    area: Rect,
    state: &AppState,
    title: &'static str,
    lines: Vec<Line<'static>>,
) {
    if area.width == 0 || area.height == 0 {
        return;
    }
    let block = Block::bordered()
        .title(title)
        .title_style(theme::header_for(state))
        .border_style(theme::border_for(state));
    let inner = block.inner(area);
    frame.render_widget(block, area);
    frame.render_widget(Paragraph::new(lines), inner);
}

fn summary_line(label: &'static str, value: String) -> Line<'static> {
    Line::from(vec![
        Span::styled(format!("{label:<10}"), theme::dim()),
        Span::raw(value),
    ])
}

fn protocol_summary_line(
    label: &str,
    value: String,
    style: Style,
    label_width: usize,
) -> Line<'static> {
    Line::from(vec![
        Span::styled(
            format!("{:<label_width$}", protocol_label(label)),
            theme::dim(),
        ),
        Span::styled(value, style),
    ])
}

fn protocol_summary_lines(state: &AppState, width: u16) -> Vec<Line<'static>> {
    let Some(status) = state.federation.status.as_ref() else {
        return vec![protocol_summary_line(
            "status",
            "[UNKNOWN]".to_string(),
            theme::dim(),
            22,
        )];
    };
    let protocols = &status.protocols;
    let newer = !protocols.newer.is_empty();
    let badge = if newer {
        "[NEWER VERSION SEEN]"
    } else if status.running && protocols.observed_peers == 0 {
        "[CURRENT · waiting for peers]"
    } else {
        "[CURRENT]"
    };
    let badge_style = Style::new()
        .fg(if newer { Color::LightRed } else { Color::Green })
        .add_modifier(Modifier::BOLD);
    let mut lines = vec![protocol_summary_line(
        "status",
        badge.to_string(),
        badge_style,
        22,
    )];
    let mut entries = Vec::new();
    for (id, local) in &protocols.local {
        let observed = protocols.observed.get(id).copied();
        let value = match observed {
            Some(remote) if remote > *local => format!("local {local} · network {remote}"),
            Some(remote) => format!("{local} · seen {remote}"),
            None => local.to_string(),
        };
        let style = if observed.is_some_and(|remote| remote > *local) {
            Style::new()
                .fg(Color::LightRed)
                .add_modifier(Modifier::BOLD)
        } else {
            Style::default()
        };
        entries.push((id.as_str(), value, style));
    }
    if width >= 58 {
        let cell_width = width as usize / 2;
        let label_width = 22.min(cell_width.saturating_sub(3));
        let value_width = cell_width.saturating_sub(label_width + 2);
        for pair in entries.chunks(2) {
            let mut spans =
                protocol_cell_spans(pair[0].0, &pair[0].1, pair[0].2, label_width, value_width);
            if let Some(second) = pair.get(1) {
                spans.push(Span::styled("  ", theme::dim()));
                spans.extend(protocol_cell_spans(
                    second.0,
                    &second.1,
                    second.2,
                    label_width,
                    value_width,
                ));
            }
            lines.push(Line::from(spans));
        }
    } else {
        lines.extend(
            entries
                .into_iter()
                .map(|(id, value, style)| protocol_summary_line(id, value, style, 22)),
        );
    }
    if newer {
        lines.push(Line::styled(
            "A newer protocol was observed; update Furumi for compatibility.",
            Style::new().fg(Color::LightRed),
        ));
    }
    lines
}

fn protocol_card_height(state: &AppState, width: u16, available: u16) -> u16 {
    let content = protocol_summary_lines(state, width).len() as u16;
    content.saturating_add(2).min(available)
}

fn protocol_cell_spans(
    label: &str,
    value: &str,
    style: Style,
    label_width: usize,
    value_width: usize,
) -> Vec<Span<'static>> {
    let value = value.chars().take(value_width).collect::<String>();
    vec![
        Span::styled(
            format!("{:<label_width$}", protocol_label(label)),
            theme::dim(),
        ),
        Span::styled(format!("{value:<value_width$}"), style),
    ]
}

fn node_summary_lines(state: &AppState) -> Vec<Line<'static>> {
    match &state.federation.status {
        None => vec![
            summary_line("Node", "loading".to_string()),
            summary_line("Network", "unknown".to_string()),
            summary_line("Peers", "waiting for status".to_string()),
        ],
        Some(status) if !status.running => {
            let network = if state.federation.settings.network_id.trim().is_empty() {
                "network id not set".to_string()
            } else {
                state.federation.settings.network_id.clone()
            };
            vec![
                summary_line("Node", "stopped".to_string()),
                summary_line("Network", network),
                summary_line(
                    "Problem",
                    status
                        .last_error
                        .as_deref()
                        .map(first_line)
                        .unwrap_or_else(|| "disabled".to_string()),
                ),
            ]
        }
        Some(status) => vec![
            summary_line("Node", format!("running on {}", status.network)),
            summary_line(
                "Peers",
                format!(
                    "{} connected / {} contacts",
                    status.connected_peers.len(),
                    status.known_contacts
                ),
            ),
            summary_line(
                "Library",
                format!(
                    "{} published / {} DHT records",
                    status.published_items,
                    status
                        .stored_dht_records
                        .map(|count| count.to_string())
                        .unwrap_or_else(|| "n/a".to_string())
                ),
            ),
        ],
    }
}

fn transport_summary_lines(state: &AppState) -> Vec<Line<'static>> {
    let Some(status) = &state.federation.status else {
        return vec![
            summary_line("Traffic", "loading".to_string()),
            summary_line("Streams", "loading".to_string()),
            summary_line("Path", "loading".to_string()),
        ];
    };
    let transport = &status.transport;
    if transport.total_samples == 0 {
        return vec![
            summary_line("Traffic", "no samples yet".to_string()),
            summary_line("Streams", format!("{} active", transport.active_streams)),
            summary_line("Path", "waiting for a stream".to_string()),
        ];
    }
    let runtime_total = transport
        .runtime_tx_bytes
        .saturating_add(transport.runtime_rx_bytes);
    let last_path = transport
        .last
        .first()
        .map(|sample| {
            format!(
                "{} / {} / {}",
                sample.protocol,
                sample.selected_path,
                rtt_label(sample.selected_rtt_ms)
            )
        })
        .unwrap_or_else(|| "no recent stream".to_string());
    vec![
        summary_line(
            "Traffic",
            format!(
                "{} (tx {} / rx {})",
                short_bytes_label(runtime_total),
                short_bytes_label(transport.runtime_tx_bytes),
                short_bytes_label(transport.runtime_rx_bytes)
            ),
        ),
        summary_line(
            "Streams",
            format!(
                "{} active / {} samples",
                transport.active_streams, transport.total_samples
            ),
        ),
        summary_line(
            "Paths",
            format!(
                "direct {} / relay {} / custom {}",
                transport.direct_samples, transport.relay_samples, transport.custom_samples
            ),
        ),
        summary_line("Last", last_path),
    ]
}

fn local_data_summary_lines(state: &AppState) -> Vec<Line<'static>> {
    match &state.local_library_stats {
        None | Some(crate::app::state::Loadable::Loading) => vec![
            summary_line("Counts", "loading".to_string()),
            summary_line("Media", "loading".to_string()),
            summary_line("SQLite", "loading".to_string()),
            summary_line("Total", "loading".to_string()),
        ],
        Some(crate::app::state::Loadable::Failed(message)) => vec![
            summary_line("Counts", "unavailable".to_string()),
            summary_line("Problem", first_line(message)),
        ],
        Some(crate::app::state::Loadable::Ready(stats)) => {
            let media = if stats.tracks_without_size > 0 {
                format!(
                    "{} · {} unknown",
                    short_bytes_label(stats.audio_bytes),
                    stats.tracks_without_size
                )
            } else {
                short_bytes_label(stats.audio_bytes)
            };
            vec![
                summary_line(
                    "Counts",
                    format!(
                        "{} artists / {} releases / {} tracks",
                        stats.artist_count, stats.release_count, stats.track_count
                    ),
                ),
                summary_line("Media", media),
                summary_line("SQLite", short_bytes_label(stats.database_bytes)),
                summary_line(
                    "Total",
                    format!(
                        "{} (covers {})",
                        short_bytes_label(stats.total_bytes()),
                        short_bytes_label(stats.cover_bytes)
                    ),
                ),
            ]
        }
    }
}

fn device_summary_lines(state: &AppState) -> Vec<Line<'static>> {
    if !state.connected_devices_enabled() {
        return vec![
            summary_line("Sync", "disabled".to_string()),
            summary_line("This", state.device_playback.self_device_name.clone()),
            summary_line("Devices", "enable federation first".to_string()),
        ];
    }
    let Some(status) = &state.federation.devices else {
        return vec![
            summary_line("Sync", "loading".to_string()),
            summary_line("This", state.device_playback.self_device_name.clone()),
            summary_line("Devices", "waiting for device status".to_string()),
        ];
    };
    let (online, offline, revoked) = device_presence_counts(state);
    let this_name = if status.this_device_name.trim().is_empty() {
        short_id(&status.this_device_id)
    } else {
        format!(
            "{} / {}",
            status.this_device_name,
            short_id(&status.this_device_id)
        )
    };
    vec![
        summary_line("This", this_name),
        summary_line(
            "Devices",
            format!(
                "{} active / {} online / {} pending",
                status.active_devices, online, status.pending_requests
            ),
        ),
        summary_line(
            "Sync",
            format!(
                "{} outbox / last {}",
                status.outbox_ops,
                status
                    .last_sync
                    .clone()
                    .unwrap_or_else(|| "not yet".to_string())
            ),
        ),
        summary_line(
            "Other",
            format!("{} offline / {} revoked", offline, revoked),
        ),
    ]
}

fn device_presence_counts(state: &AppState) -> (usize, usize, usize) {
    let Some(status) = &state.federation.devices else {
        return (0, 0, 0);
    };
    let now = crate::app::state::unix_time_ms();
    let mut online = 0usize;
    let mut offline = 0usize;
    let mut revoked = 0usize;
    for device in &status.devices {
        match crate::app::state::device_presence_section(state, device, now) {
            DevicePresenceSection::Online => online += 1,
            DevicePresenceSection::Offline => offline += 1,
            DevicePresenceSection::Revoked => revoked += 1,
        }
    }
    (online, offline, revoked)
}

fn first_line(value: &str) -> String {
    value.lines().next().unwrap_or(value).to_string()
}

pub(super) struct StatusDetailSections {
    pub status: Vec<Line<'static>>,
    pub devices: Vec<Line<'static>>,
    pub logs: Vec<Line<'static>>,
}

pub(super) fn status_detail_sections(
    state: &AppState,
    status_cursor: usize,
) -> StatusDetailSections {
    StatusDetailSections {
        status: status_detail_status_lines(state, status_cursor),
        devices: status_detail_device_lines(state),
        logs: status_detail_transport_logs(state),
    }
}

fn status_detail_status_lines(state: &AppState, status_cursor: usize) -> Vec<Line<'static>> {
    let mut lines: Vec<Line> = vec![Line::styled("Status", theme::header_for(state))];
    match &state.federation.status {
        None => lines.push(Line::styled("loading…", theme::dim())),
        Some(status) if !status.running => {
            lines.push(status_line("Node", "stopped".to_string()));
            if let Some(error) = &status.last_error {
                lines.push(status_line("Error", first_line(error)));
            }
            lines.push(Line::default());
            lines.push(Line::styled(
                "Set the same Network ID on each client.",
                theme::dim(),
            ));
        }
        Some(status) => {
            lines.push(status_line("Node", format!("running · {}", status.network)));
            lines.push(status_action_line(
                "Endpoint",
                format!(
                    "{} · dht {}",
                    short_id(&status.endpoint_id),
                    short_id(&status.dht_node_id)
                ),
                state,
                status_cursor == 0,
            ));
            lines.push(status_line(
                "Peers",
                format!(
                    "{} connected · {} contacts",
                    status.connected_peers.len(),
                    status.known_contacts
                ),
            ));
            if !status.connected_peers.is_empty() {
                let mut peers: Vec<String> = status
                    .connected_peers
                    .iter()
                    .take(4)
                    .map(|peer| short_id(peer))
                    .collect();
                if status.connected_peers.len() > peers.len() {
                    peers.push(format!("+{}", status.connected_peers.len() - peers.len()));
                }
                lines.push(status_action_line(
                    "Peer IDs",
                    peers.join(", "),
                    state,
                    status_cursor == 1,
                ));
            }
            lines.push(status_line(
                "DHT",
                format!(
                    "{} records · {}",
                    status
                        .stored_dht_records
                        .map(|count| count.to_string())
                        .unwrap_or_else(|| "n/a".to_string()),
                    status
                        .stored_dht_bytes
                        .map(short_bytes_label)
                        .unwrap_or_else(|| "n/a".to_string())
                ),
            ));
            lines.push(status_line(
                "Published",
                format!("{} items", status.published_items),
            ));
            lines.push(status_line(
                "Last sync",
                status
                    .last_sync
                    .clone()
                    .unwrap_or_else(|| "not yet".to_string()),
            ));
            if let Some(error) = &status.last_error {
                lines.push(status_line("Error", first_line(error)));
            }
            push_transport_summary_status(&mut lines, state, status);
        }
    }
    lines
}

fn status_action_line(
    label: &str,
    value: String,
    state: &AppState,
    selected: bool,
) -> Line<'static> {
    let marker = if selected { "▶" } else { " " };
    Line::from(vec![
        Span::styled(
            format!("{marker} {label:<16}"),
            if selected {
                theme::accent_for(state)
            } else {
                theme::dim()
            },
        ),
        Span::raw(value),
        Span::styled("  ↵", theme::dim()),
    ])
}

fn push_transport_summary_status(
    lines: &mut Vec<Line<'static>>,
    state: &AppState,
    status: &crate::federation::FedStatus,
) {
    lines.push(Line::default());
    lines.push(Line::styled("Iroh Transport", theme::header_for(state)));
    let transport = &status.transport;
    let runtime_total = transport
        .runtime_tx_bytes
        .saturating_add(transport.runtime_rx_bytes);
    lines.push(status_line(
        "Traffic",
        format!(
            "{} · tx {} · rx {}",
            short_bytes_label(runtime_total),
            short_bytes_label(transport.runtime_tx_bytes),
            short_bytes_label(transport.runtime_rx_bytes)
        ),
    ));
    lines.push(status_line(
        "Active",
        format!("{} streams", transport.active_streams),
    ));
    if transport.runtime_lost_packets > 0 || transport.runtime_lost_bytes > 0 {
        lines.push(status_line(
            "Loss",
            format!(
                "{} pkts · {}",
                transport.runtime_lost_packets,
                short_bytes_label(transport.runtime_lost_bytes)
            ),
        ));
    }
    lines.push(status_line(
        "Samples",
        format!(
            "{} total · {} direct · {} relay · {} unknown",
            transport.total_samples,
            transport.direct_samples,
            transport.relay_samples,
            transport.unknown_samples
        ),
    ));
    lines.push(status_line(
        "Protocols",
        format!(
            "audio {} · catalog {} · sync {}",
            transport.audio_samples, transport.catalog_samples, transport.sync_samples
        ),
    ));
    if let Some(sample) = transport.last.first() {
        lines.push(status_line(
            "Last stream",
            format!(
                "{} {} {} · {} · {}",
                sample.protocol,
                sample.direction,
                sample.phase,
                sample.selected_path,
                rtt_label(sample.selected_rtt_ms)
            ),
        ));
        lines.push(status_line(
            "Last peer",
            format!(
                "{} · paths {}/{}/{}/{}",
                short_id(&sample.peer_id),
                sample.direct_paths,
                sample.relay_paths,
                sample.custom_paths,
                sample.open_paths
            ),
        ));
        lines.push(status_line(
            "Last bytes",
            format!(
                "sel {}/{} · total {}/{} · lost {}",
                short_bytes_label(sample.selected_tx_bytes),
                short_bytes_label(sample.selected_rx_bytes),
                short_bytes_label(sample.total_tx_bytes),
                short_bytes_label(sample.total_rx_bytes),
                short_bytes_label(sample.lost_bytes)
            ),
        ));
    }
}

pub(super) fn status_detail_transport_logs(state: &AppState) -> Vec<Line<'static>> {
    let Some(status) = &state.federation.status else {
        return vec![Line::styled("transport status is loading", theme::dim())];
    };
    if status.transport.last.is_empty() {
        return vec![Line::styled("no connection samples yet", theme::dim())];
    }
    status
        .transport
        .last
        .iter()
        .map(|sample| {
            Line::from(vec![
                Span::styled(format!("{:<12}", sample.at), theme::dim()),
                Span::raw(format!(
                    "{} {} {} · {} · {} · tx {} rx {}",
                    sample.protocol,
                    sample.direction,
                    sample.phase,
                    sample.selected_path,
                    rtt_label(sample.selected_rtt_ms),
                    short_bytes_label(sample.total_tx_bytes),
                    short_bytes_label(sample.total_rx_bytes)
                )),
            ])
        })
        .collect()
}

fn status_detail_device_lines(state: &AppState) -> Vec<Line<'static>> {
    let mut lines = vec![Line::styled("Connected Devices", theme::header_for(state))];
    match &state.federation.devices {
        None => lines.push(Line::styled("loading…", theme::dim())),
        Some(status) => {
            lines.push(status_line(
                "This device",
                format!("{} · {}", status.this_device_name, status.this_device_id),
            ));
            lines.push(status_line("Sync group", status.group_id.clone()));
            lines.push(status_line(
                "Devices",
                format!(
                    "{} active · {} revoked · {} pending",
                    status.active_devices, status.revoked_devices, status.pending_requests
                ),
            ));
            lines.push(status_line(
                "Sync log",
                format!(
                    "{} ops · {} outbox · {} tombstones",
                    status.ops_total, status.outbox_ops, status.tombstone_ops
                ),
            ));
            lines.push(status_line(
                "Snapshot",
                format!(
                    "{} likes · {} playlists · {} items",
                    status.snapshot_likes, status.snapshot_playlists, status.snapshot_items
                ),
            ));
            lines.push(status_line(
                "Unresolved",
                status.unresolved_playlist_items.to_string(),
            ));
            lines.push(status_line("Ack floor", status.peer_ack_floor.clone()));
            if let Some(last_sync) = &status.last_sync {
                lines.push(status_line("Last sync", last_sync.clone()));
            }
            if let Some(last_error) = &status.last_error {
                lines.push(status_line("Error", first_line(last_error)));
            }
            lines.push(Line::default());
            lines.push(Line::styled("Device List", theme::header_for(state)));
            if status.devices.is_empty() {
                lines.push(status_line("Devices", "none recorded".to_string()));
            } else {
                let ordered = crate::app::state::device_status_order(state);
                let now = crate::app::state::unix_time_ms();
                let mut emitted = Vec::new();
                for index in &ordered {
                    if let Some(device) = status.devices.get(*index) {
                        push_device_detail_compact(
                            &mut lines,
                            state,
                            device,
                            now,
                            !emitted.is_empty(),
                        );
                        emitted.push(*index);
                    }
                }
                for (index, device) in status.devices.iter().enumerate() {
                    if !emitted.contains(&index) {
                        push_device_detail_compact(
                            &mut lines,
                            state,
                            device,
                            now,
                            !emitted.is_empty(),
                        );
                        emitted.push(index);
                    }
                }
            }
        }
    }
    lines
}

fn push_device_detail_compact(
    lines: &mut Vec<Line<'static>>,
    state: &AppState,
    device: &crate::devices::DeviceStatusRow,
    now_ms: i64,
    separator: bool,
) {
    if separator {
        lines.push(Line::styled(
            "────────────────────────────────",
            theme::dim(),
        ));
    }
    let presence = crate::app::state::device_presence_section(state, device, now_ms);
    let icon = match presence {
        DevicePresenceSection::Online => "●",
        DevicePresenceSection::Offline => "○",
        DevicePresenceSection::Revoked => "×",
    };
    let mut badges = Vec::new();
    if device.is_self {
        badges.push("this");
    }
    match presence {
        DevicePresenceSection::Online => badges.push("online"),
        DevicePresenceSection::Offline => badges.push("offline"),
        DevicePresenceSection::Revoked => badges.push("revoked"),
    }
    let version = if device.client_version.trim().is_empty() {
        "v?".to_string()
    } else {
        format!("v{}", device.client_version)
    };
    lines.push(Line::from(vec![
        Span::styled(format!("{icon} "), theme::accent_for(state)),
        Span::raw(crate::app::state::device_display_name(device)),
        Span::styled(
            format!(" · {} · {}", version, badges.join(", ")),
            theme::dim(),
        ),
    ]));
    lines.push(status_line("Device ID", device.device_id.clone()));
    lines.push(status_line(
        "Endpoint",
        if device.endpoint_id.trim().is_empty() {
            "unavailable".to_string()
        } else {
            short_id(&device.endpoint_id)
        },
    ));
    lines.push(status_line(
        "Last seen",
        relative_time_label(device.last_seen_ms, now_ms),
    ));
}

fn relative_time_label(value_ms: Option<i64>, now_ms: i64) -> String {
    let Some(value_ms) = value_ms else {
        return "unavailable".to_string();
    };
    let delta_ms = now_ms.saturating_sub(value_ms);
    if delta_ms < 0 {
        return "in the future".to_string();
    }
    let seconds = delta_ms / 1000;
    if seconds < 5 {
        "just now".to_string()
    } else if seconds < 60 {
        format!("{seconds}s ago")
    } else if seconds < 60 * 60 {
        format!("{}m ago", seconds / 60)
    } else if seconds < 24 * 60 * 60 {
        format!("{}h ago", seconds / 60 / 60)
    } else {
        format!("{}d ago", seconds / 60 / 60 / 24)
    }
}