use std::time::Duration;

use floem::{
    Application,
    action::exec_after,
    event::EventPropagation,
    kurbo::Size,
    peniko::Color,
    prelude::*,
    reactive::{Effect, RwSignal, SignalGet, SignalTrack, SignalUpdate, SignalWith},
    style::Position,
    window::WindowConfig,
};
use lumbridge_ui_fixture::{
    FOOTER_FIXTURE_NOTICE, FocusDirection, PaneId, PaneState, ShellAction, ShellModel, SurfaceKind,
};

const BG: Color = Color::from_rgb8(9, 12, 18);
const PANEL: Color = Color::from_rgb8(16, 22, 32);
const PANEL_ALT: Color = Color::from_rgb8(21, 29, 41);
const PANEL_ACTIVE: Color = Color::from_rgb8(24, 35, 52);
const BORDER: Color = Color::from_rgb8(38, 50, 70);
const BORDER_QUIET: Color = Color::from_rgb8(28, 38, 54);
const TEXT: Color = Color::from_rgb8(219, 229, 244);
const MUTED: Color = Color::from_rgb8(130, 144, 168);
const ACCENT: Color = Color::from_rgb8(104, 181, 248);
const ATTENTION: Color = Color::from_rgb8(241, 185, 106);
const SUCCESS: Color = Color::from_rgb8(112, 214, 168);
const OS_MOD: Modifiers = if cfg!(target_os = "macos") {
    Modifiers::META
} else {
    Modifiers::CONTROL
};

fn dispatch(model: RwSignal<ShellModel>, action: ShellAction) {
    model.update(|model| {
        model.dispatch(action);
    });
}

fn pane_card(id: PaneId, model: RwSignal<ShellModel>) -> impl IntoView {
    dyn_container(
        move || model.with(|model| (model.pane(id).clone(), model.selected_pane() == id)),
        move |(pane, selected)| render_pane_card(pane, selected, model),
    )
    .style(|s| {
        s.flex_basis(0)
            .flex_grow(1.0)
            .min_width(0.0)
            .min_height(0.0)
            .margin(4.0)
    })
}

fn render_pane_card(pane: PaneState, selected: bool, model: RwSignal<ShellModel>) -> impl IntoView {
    let id = pane.id();
    let needs_input = pane.needs_input();
    let state_color = if needs_input {
        ATTENTION
    } else if matches!(pane.kind(), SurfaceKind::Terminal) {
        SUCCESS
    } else {
        ACCENT
    };
    let state_label = if matches!(pane.kind(), SurfaceKind::Terminal) {
        pane.status().label()
    } else {
        pane.fixture().badge
    };
    let start = pane.lines().len().saturating_sub(12);
    let lines = Stack::from_iter(pane.lines()[start..].iter().cloned().map(|line| {
        Label::new(line).style(|s| {
            s.font_size(12.0)
                .color(TEXT)
                .margin_bottom(4.0)
                .min_width(0.0)
        })
    }))
    .style(|s| s.flex_col().padding_horiz(10.0).padding_bottom(10.0));

    let header = Stack::horizontal((
        Stack::horizontal((
            Label::new(format!("{}", id.index() + 1))
                .style(|s| s.font_size(11.0).color(MUTED).margin_right(8.0)),
            Label::new(pane.fixture().title)
                .style(|s| s.flex_grow(1.0).font_size(13.0).color(TEXT)),
        ))
        .style(|s| s.items_center().min_width(0.0).flex_grow(1.0)),
        Label::new(state_label).style(move |s| s.font_size(10.0).color(state_color)),
    ))
    .style(move |s| {
        s.items_center()
            .height(36.0)
            .padding_horiz(10.0)
            .background(if selected { PANEL_ACTIVE } else { PANEL_ALT })
            .border_bottom(1.0)
            .border_color(BORDER_QUIET)
    });

    let target = Stack::horizontal((
        Label::new(pane.fixture().target).style(|s| s.flex_grow(1.0).color(MUTED)),
        Label::new(if selected { "FOCUSED" } else { "" })
            .style(|s| s.font_size(10.0).color(ACCENT)),
    ))
    .style(|s| {
        s.items_center()
            .padding_horiz(10.0)
            .padding_vert(8.0)
            .font_size(11.0)
    });

    Stack::vertical((header, target, lines))
        .style(move |s| {
            s.width_full()
                .height_full()
                .min_width(0.0)
                .min_height(0.0)
                .background(if selected { PANEL_ACTIVE } else { PANEL })
                .border(if selected { 2.0 } else { 1.0 })
                .border_color(if selected || needs_input {
                    state_color
                } else {
                    BORDER
                })
                .border_radius(5.0)
                .keyboard_navigable()
        })
        .on_event_stop(listener::Click, move |_, _| {
            dispatch(model, ShellAction::SelectPane(id));
        })
}

fn sidebar() -> impl IntoView {
    // The worktree list this shell used to render came from a five-entry
    // fixture naming this developer's machines, backed by no git integration.
    // The GPUI shell's copy was deleted in the same pass; this one renders the
    // workspace it is actually open on.
    let worktrees = Stack::vertical((Label::new("Lumbridge Code"),)).style(|s| {
        s.flex_col()
            .padding_horiz(8.0)
            .padding_vert(7.0)
            .color(TEXT)
    });

    Stack::vertical((
        Label::new("ATTENTION · 1").style(|s| s.font_size(10.0).color(ATTENTION).padding(12.0)),
        Stack::vertical((
            Label::new("Claude Code · UI").style(|s| s.color(TEXT)),
            Label::new("Waiting for a split decision")
                .style(|s| s.font_size(10.0).color(MUTED).margin_top(3.0)),
        ))
        .style(|s| {
            s.margin_horiz(8.0)
                .margin_bottom(12.0)
                .padding(10.0)
                .background(PANEL_ACTIVE)
                .border(1.0)
                .border_color(ATTENTION)
                .border_radius(5.0)
        }),
        Label::new("WORKTREES").style(|s| s.font_size(10.0).color(MUTED).padding(12.0)),
        worktrees,
        Label::new("RUNTIMES").style(|s| {
            s.font_size(10.0)
                .color(MUTED)
                .padding_horiz(12.0)
                .padding_vert(9.0)
                .margin_top(8.0)
        }),
        Label::new("● metal · connected").style(|s| s.color(SUCCESS).padding_horiz(12.0)),
        Label::new("● amd-server · connected")
            .style(|s| s.color(MUTED).padding_horiz(12.0).margin_top(7.0)),
        Label::new("○ spark-1 · sleeping")
            .style(|s| s.color(MUTED).padding_horiz(12.0).margin_top(7.0)),
        Empty::new().style(|s| s.flex_grow(1.0)),
        Stack::vertical((
            Label::new("Buzz · lumbridgecode"),
            Label::new("connected · signed identity").style(|s| s.color(SUCCESS).margin_top(3.0)),
        ))
        .style(|s| {
            s.margin(10.0)
                .padding(10.0)
                .font_size(10.0)
                .color(MUTED)
                .background(PANEL_ALT)
                .border_radius(5.0)
        }),
    ))
    .style(|s| {
        s.width(248.0)
            .height_full()
            .flex_shrink(0.0)
            .background(PANEL)
            .border_right(1.0)
            .border_color(BORDER_QUIET)
    })
}

fn tabs() -> impl IntoView {
    Stack::horizontal((
        Label::new("Agent workspace").style(|s| {
            s.height_full()
                .items_center()
                .padding_horiz(12.0)
                .border_bottom(2.0)
                .border_color(ACCENT)
                .color(TEXT)
        }),
        Label::new("Architecture.md").style(|s| s.padding_horiz(12.0).color(MUTED)),
        Label::new("Review").style(|s| s.padding_horiz(12.0).color(MUTED)),
        Empty::new().style(|s| s.flex_grow(1.0)),
        Label::new("6 surfaces · 3 remote · 1 waiting")
            .style(|s| s.font_size(10.0).padding_horiz(12.0).color(MUTED)),
    ))
    .style(|s| {
        s.height(38.0)
            .items_center()
            .font_size(12.0)
            .background(PANEL)
            .border_bottom(1.0)
            .border_color(BORDER_QUIET)
    })
}

fn command_palette(query: RwSignal<String>) -> impl IntoView {
    let input = TextInput::new(query)
        .placeholder("Type a command…")
        .style(|s| {
            s.width_full()
                .height(44.0)
                .padding_horiz(12.0)
                .color(TEXT)
                .background(PANEL_ALT)
                .border(0.0)
        });
    let input_id = input.id();
    exec_after(Duration::from_millis(1), move |_| input_id.request_focus());

    let card = Stack::vertical((
        input,
        Stack::vertical((
            Stack::vertical((
                Label::new("Focus next pane").style(|s| s.color(TEXT)),
                Label::new("Workspace · navigation")
                    .style(|s| s.font_size(10.0).color(MUTED).margin_top(3.0)),
            ))
            .style(|s| s.padding(10.0).background(PANEL_ACTIVE).border_radius(5.0)),
            Label::new("Open attention request").style(|s| s.padding(10.0).color(MUTED)),
            Label::new("Share selected pane to Buzz…").style(|s| s.padding(10.0).color(MUTED)),
        ))
        .style(|s| {
            s.padding(8.0)
                .border_top(1.0)
                .border_bottom(1.0)
                .border_color(BORDER)
        }),
        Stack::horizontal((
            Label::new("Enter to run").style(|s| s.flex_grow(1.0)),
            Label::new("Esc to close"),
        ))
        .style(|s| {
            s.padding_horiz(12.0)
                .padding_vert(8.0)
                .font_size(10.0)
                .color(MUTED)
        }),
    ))
    .style(|s| {
        s.width(620.0)
            .margin_top(92.0)
            .background(PANEL_ALT)
            .border(1.0)
            .border_color(ACCENT)
            .border_radius(8.0)
    });

    Container::new(card).style(|s| {
        s.position(Position::Absolute)
            .inset(0.0)
            .items_start()
            .justify_center()
            .background(Color::from_rgba8(5, 7, 11, 220))
            .z_index(50)
    })
}

fn handle_key(
    model: RwSignal<ShellModel>,
    query: RwSignal<String>,
    KeyboardEvent {
        code,
        key,
        modifiers,
        ..
    }: &KeyboardEvent,
) -> EventPropagation {
    if *code == Code::KeyK && modifiers.contains(OS_MOD) {
        query.set(String::new());
        dispatch(model, ShellAction::OpenCommandPalette);
        return EventPropagation::Stop;
    }

    if model.with(|model| model.command_palette().is_open()) {
        if *key == Key::Named(NamedKey::Escape) {
            query.set(String::new());
            dispatch(model, ShellAction::CloseCommandPalette);
            return EventPropagation::Stop;
        }
        return EventPropagation::Continue;
    }

    let action = match key {
        Key::Named(NamedKey::ArrowLeft) => Some(ShellAction::MoveFocus(FocusDirection::Left)),
        Key::Named(NamedKey::ArrowRight) => Some(ShellAction::MoveFocus(FocusDirection::Right)),
        Key::Named(NamedKey::ArrowUp) => Some(ShellAction::MoveFocus(FocusDirection::Up)),
        Key::Named(NamedKey::ArrowDown) => Some(ShellAction::MoveFocus(FocusDirection::Down)),
        Key::Character(character) if modifiers.is_empty() => match character.as_str() {
            "h" => Some(ShellAction::MoveFocus(FocusDirection::Left)),
            "l" => Some(ShellAction::MoveFocus(FocusDirection::Right)),
            "k" => Some(ShellAction::MoveFocus(FocusDirection::Up)),
            "j" => Some(ShellAction::MoveFocus(FocusDirection::Down)),
            "1" => Some(ShellAction::SelectPane(PaneId::CodexRuntime)),
            "2" => Some(ShellAction::SelectPane(PaneId::ClaudeUi)),
            "3" => Some(ShellAction::SelectPane(PaneId::PiDocs)),
            "4" => Some(ShellAction::SelectPane(PaneId::Architecture)),
            "5" => Some(ShellAction::SelectPane(PaneId::AcpPreview)),
            "6" => Some(ShellAction::SelectPane(PaneId::RuntimeReview)),
            _ => None,
        },
        _ => None,
    };

    if let Some(action) = action {
        dispatch(model, action);
        EventPropagation::Stop
    } else {
        EventPropagation::Continue
    }
}

fn app_view() -> impl IntoView {
    let model = RwSignal::new(ShellModel::with_all_panels_attached());
    let query = RwSignal::new(String::new());
    let timer_pulse = RwSignal::new(());

    Effect::new(move |_| {
        timer_pulse.track();
        exec_after(Duration::from_millis(650), move |_| {
            dispatch(model, ShellAction::SyntheticStreamTick);
            timer_pulse.set(());
        });
    });

    Effect::new(move |_| {
        let query = query.get();
        model.update(|model| {
            if model.command_palette().is_open() && model.command_palette().query() != query {
                model.dispatch(ShellAction::SetCommandPaletteQuery(query));
            }
        });
    });

    let top_row = Stack::horizontal((
        pane_card(PaneId::CodexRuntime, model),
        pane_card(PaneId::ClaudeUi, model),
        pane_card(PaneId::PiDocs, model),
    ))
    .style(|s| s.flex_basis(0).flex_grow(1.0).min_height(0.0).width_full());
    let bottom_row = Stack::horizontal((
        pane_card(PaneId::Architecture, model),
        pane_card(PaneId::AcpPreview, model),
        pane_card(PaneId::RuntimeReview, model),
    ))
    .style(|s| s.flex_basis(0).flex_grow(1.0).min_height(0.0).width_full());
    let grid = Stack::vertical((top_row, bottom_row)).style(|s| {
        s.flex_basis(0)
            .flex_grow(1.0)
            .min_width(0.0)
            .min_height(0.0)
            .padding(4.0)
    });

    let header = Stack::horizontal((
        Label::new("Lumbridge").style(|s| s.font_size(18.0).color(TEXT)),
        Label::new("Lumbridge Code / main")
            .style(|s| s.color(MUTED).margin_left(12.0).flex_grow(1.0)),
        Label::new("metal · runtime online")
            .style(|s| s.font_size(10.0).color(SUCCESS).margin_right(18.0)),
        Label::new("Ctrl/⌘ K · Commands")
            .style(|s| s.color(ACCENT).keyboard_navigable())
            .on_event_stop(listener::Click, move |_, _| {
                query.set(String::new());
                dispatch(model, ShellAction::OpenCommandPalette);
            }),
    ))
    .style(|s| {
        s.height(48.0)
            .padding_horiz(14.0)
            .items_center()
            .background(PANEL_ALT)
            .border_bottom(1.0)
            .border_color(BORDER_QUIET)
    });

    let body = Stack::horizontal((
        sidebar(),
        Stack::vertical((tabs(), grid)).style(|s| {
            s.flex_basis(0)
                .flex_grow(1.0)
                .min_width(0.0)
                .min_height(0.0)
        }),
    ))
    .style(|s| s.flex_basis(0).flex_grow(1.0).min_height(0.0));

    let footer = Stack::horizontal((
        Label::derived(move || {
            model.with(|model| {
                let counters = model.counters();
                format!(
                    "rev {} · {} focus moves · {} surface updates · {} lines",
                    model.revision(),
                    counters.focus_moves,
                    counters.surface_updates,
                    counters.terminal_lines_appended
                )
            })
        })
        .style(|s| s.flex_grow(1.0)),
        Label::new(FOOTER_FIXTURE_NOTICE).style(|s| s.flex_grow(1.0)),
    ))
    .style(|s| {
        s.height(32.0)
            .padding_horiz(10.0)
            .items_center()
            .font_size(10.0)
            .color(MUTED)
            .background(PANEL_ALT)
            .border_top(1.0)
            .border_color(BORDER_QUIET)
    });

    let palette = dyn_container(
        move || model.with(|model| model.command_palette().is_open()),
        move |open| {
            if open {
                command_palette(query).into_any()
            } else {
                Empty::new().into_any()
            }
        },
    );

    let root = Stack::vertical((header, body, footer, palette))
        .style(|s| {
            s.position(Position::Relative)
                .width_full()
                .height_full()
                .background(BG)
                .color(TEXT)
                .keyboard_navigable()
        })
        .on_event(listener::KeyDown, move |_, event| {
            handle_key(model, query, event)
        })
        .window_title(|| "Lumbridge · Floem workspace".to_owned());

    let root_id = root.id();
    exec_after(Duration::from_millis(1), move |_| root_id.request_focus());
    root
}

fn main() {
    Application::new()
        .window(
            |_| app_view(),
            Some(
                WindowConfig::default()
                    .size(Size::new(1500.0, 960.0))
                    .min_size(Size::new(900.0, 600.0))
                    .title("Lumbridge · Floem workspace"),
            ),
        )
        .run();
}