//! `tahuantinsuyu-canvas` — el widget GPUI del lienzo astrológico.
//!
//! Modela el cielo como un lienzo de **geometría reactiva**: un estado
//! unificado [`CanvasState`] guarda offsets de rotación, flags de
//! visibilidad y la lista de `Layer`s a pintar. Las interacciones
//! (drag, hotkeys, toggles) mutan el estado; el render lee la última
//! `RenderModel` y la deriva al frame.
//!
//! ## Convención de rotación
//!
//! El Ascendente cae a las 9 del reloj (lado izquierdo). Las casas
//! crecen contrarreloj visualmente. Para una longitud eclíptica `L` y
//! un ascendente `asc`:
//!
//! ```text
//!   screen_angle_rad = π - (L - asc + view_rotation) · π/180
//!   point = (cx + r·cos(θ), cy + r·sin(θ))
//! ```
//!
//! ## Interacciones (fase 4)
//!
//! - **Drag en el aro exterior** (jog-dial perimetral): rota la rueda
//!   visualmente mientras dura el drag y, al soltar, traduce el delta
//!   angular a minutos (1° ≈ 4 min) y emite
//!   [`CanvasEvent::TimeOffsetChanged`]. El host (la app) recomputa la
//!   carta para el instante desplazado.
//! - **Hotkeys**: `D`/`H`/`X`/`P` togglean SignDial/Houses/Aspects/
//!   Bodies. Click sobre el wheel le da focus al widget.

#![forbid(unsafe_code)]
#![warn(rust_2018_idioms)]

use std::collections::HashMap;
use std::f32::consts::PI;

use gpui::{
    AppContext, Bounds, Context, EventEmitter, FocusHandle, Focusable, Hsla, IntoElement,
    KeyDownEvent, MouseButton, MouseDownEvent, MouseMoveEvent, MouseUpEvent, ParentElement,
    PathBuilder, Pixels, Point, Render, SharedString, Styled, Window, canvas, div, hsla, point,
    prelude::*, px,
};

use tahuantinsuyu_engine::{Geometry, Layer, LayerKind, RenderModel};
use tahuantinsuyu_model::{ChartId, ContactId, GroupId};
use tahuantinsuyu_theme::{AspectKind as TAspectKind, AstroPalette, Element, Planet};
use yahweh_theme::Theme;

// =====================================================================
// Eventos
// =====================================================================

#[derive(Clone, Debug)]
pub enum CanvasEvent {
    /// Doble click sobre un thumbnail.
    ChartRequested(ChartId),
    /// Drag terminado: el offset acumulado de tiempo (en minutos)
    /// cambió. El host debe recomputar el chart con este offset.
    TimeOffsetChanged(i64),
    /// El usuario togggleó una capa via hotkey — el panel debería
    /// reflejarlo si quisiera mantenerse en sync.
    LayerVisibilityChanged { kind: LayerKind, visible: bool },
}

// =====================================================================
// Estado
// =====================================================================

#[derive(Clone, Debug, Default)]
pub enum CanvasMode {
    #[default]
    Empty,
    Wheel { render: Box<RenderModel> },
    Thumbnails {
        scope: ThumbnailScope,
        items: Vec<ThumbnailItem>,
    },
}

#[derive(Clone, Debug)]
pub enum ThumbnailScope {
    Group(GroupId),
    Contact(ContactId),
}

#[derive(Clone, Debug)]
pub struct ThumbnailItem {
    pub chart_id: ChartId,
    pub label: SharedString,
    pub subtitle: Option<SharedString>,
    pub preview: Option<RenderModel>,
}

/// Estado de un drag activo del jog-dial. `last_screen_angle_deg` se
/// actualiza en cada `MouseMoveEvent`; `accumulated_delta_deg` lleva la
/// rotación total desde que arrancó el drag (puede pasar de ±360°).
#[derive(Clone, Debug)]
struct JogDragState {
    last_screen_angle_deg: f32,
    accumulated_delta_deg: f32,
}

#[derive(Clone, Debug)]
pub struct CanvasState {
    pub mode: CanvasMode,
    /// Rotación visual transitoria durante un drag. Se resetea a `0` al
    /// soltar — el render nuevo trae el `ascendant_deg` ya rotado.
    pub view_rotation_deg: f32,
    /// Offset acumulado en minutos. Persiste entre drags hasta que el
    /// host lo resetee.
    pub time_offset_minutes: i64,
    /// Por-LayerKind: `true` = visible. Default = todo visible.
    pub layer_visibility: HashMap<LayerKind, bool>,
    drag_jog: Option<JogDragState>,
}

impl Default for CanvasState {
    fn default() -> Self {
        Self {
            mode: CanvasMode::default(),
            view_rotation_deg: 0.0,
            time_offset_minutes: 0,
            layer_visibility: HashMap::new(),
            drag_jog: None,
        }
    }
}

impl CanvasState {
    pub fn is_layer_visible(&self, kind: LayerKind) -> bool {
        self.layer_visibility.get(&kind).copied().unwrap_or(true)
    }
}

// =====================================================================
// Widget
// =====================================================================

pub struct AstrologyCanvas {
    state: CanvasState,
    focus_handle: FocusHandle,
}

impl EventEmitter<CanvasEvent> for AstrologyCanvas {}

impl Focusable for AstrologyCanvas {
    fn focus_handle(&self, _: &gpui::App) -> FocusHandle {
        self.focus_handle.clone()
    }
}

impl AstrologyCanvas {
    pub fn new(cx: &mut Context<Self>) -> Self {
        cx.observe_global::<Theme>(|_, cx| cx.notify()).detach();
        Self {
            state: CanvasState::default(),
            focus_handle: cx.focus_handle(),
        }
    }

    pub fn state(&self) -> &CanvasState {
        &self.state
    }

    pub fn set_mode(&mut self, mode: CanvasMode, cx: &mut Context<Self>) {
        self.state.mode = mode;
        cx.notify();
    }

    pub fn set_layer_visible(&mut self, kind: LayerKind, visible: bool, cx: &mut Context<Self>) {
        self.state.layer_visibility.insert(kind, visible);
        cx.notify();
    }

    pub fn toggle_layer(&mut self, kind: LayerKind, cx: &mut Context<Self>) {
        let current = self.state.is_layer_visible(kind);
        self.set_layer_visible(kind, !current, cx);
        cx.emit(CanvasEvent::LayerVisibilityChanged {
            kind,
            visible: !current,
        });
    }

    pub fn reset_time_offset(&mut self, cx: &mut Context<Self>) {
        if self.state.time_offset_minutes != 0 || self.state.view_rotation_deg != 0.0 {
            self.state.time_offset_minutes = 0;
            self.state.view_rotation_deg = 0.0;
            cx.emit(CanvasEvent::TimeOffsetChanged(0));
            cx.notify();
        }
    }

    pub fn set_view_rotation(&mut self, deg: f32, cx: &mut Context<Self>) {
        self.state.view_rotation_deg = deg.rem_euclid(360.0);
        cx.notify();
    }

    // ----- Internos: handlers de jog-dial -----

    fn on_jog_down(
        &mut self,
        position: Point<Pixels>,
        bounds: Bounds<Pixels>,
        cx: &mut Context<Self>,
    ) {
        let (cx_px, cy_px) = bounds_center(bounds);
        let mx: f32 = position.x.into();
        let my: f32 = position.y.into();
        let dx = mx - cx_px;
        let dy = my - cy_px;
        let dist = (dx * dx + dy * dy).sqrt();
        let r_outer = (WHEEL_SIZE - WHEEL_MARGIN * 2.0) / 2.0;
        let radii = Radii::from_outer(r_outer);
        // Aro de captura un poco más generoso que el anillo del dial.
        if dist < radii.sign_inner * 0.95 || dist > radii.sign_outer * 1.10 {
            return;
        }
        let angle = dy.atan2(dx).to_degrees();
        self.state.drag_jog = Some(JogDragState {
            last_screen_angle_deg: angle,
            accumulated_delta_deg: 0.0,
        });
    }

    fn on_jog_move(
        &mut self,
        position: Point<Pixels>,
        bounds: Bounds<Pixels>,
        cx: &mut Context<Self>,
    ) {
        let Some(jog) = self.state.drag_jog.as_mut() else {
            return;
        };
        let (cx_px, cy_px) = bounds_center(bounds);
        let mx: f32 = position.x.into();
        let my: f32 = position.y.into();
        let dx = mx - cx_px;
        let dy = my - cy_px;
        let angle = dy.atan2(dx).to_degrees();
        let mut delta = angle - jog.last_screen_angle_deg;
        // Normalizar a (-180, 180] para cruzar el wrap sin saltar.
        if delta > 180.0 {
            delta -= 360.0;
        } else if delta < -180.0 {
            delta += 360.0;
        }
        jog.accumulated_delta_deg += delta;
        jog.last_screen_angle_deg = angle;
        // Reflejo visual durante el drag (sin recomputar).
        self.state.view_rotation_deg = jog.accumulated_delta_deg;
        cx.notify();
    }

    fn on_jog_up(&mut self, cx: &mut Context<Self>) {
        let Some(jog) = self.state.drag_jog.take() else {
            return;
        };
        // 1° de arco ≈ 4 minutos de tiempo sideral (15°/hora).
        // CW visual (delta negativa en nuestra convención) → tiempo
        // hacia adelante.
        let delta_minutes = (-jog.accumulated_delta_deg * 4.0) as i64;
        if delta_minutes != 0 {
            self.state.time_offset_minutes =
                self.state.time_offset_minutes.saturating_add(delta_minutes);
            // Snap visual: el shell recomputa con el nuevo offset y el
            // render trae el ascendant rotado.
            self.state.view_rotation_deg = 0.0;
            cx.emit(CanvasEvent::TimeOffsetChanged(self.state.time_offset_minutes));
            cx.notify();
        } else {
            self.state.view_rotation_deg = 0.0;
            cx.notify();
        }
    }

    fn on_key_down(&mut self, event: &KeyDownEvent, _w: &mut Window, cx: &mut Context<Self>) {
        let key = event.keystroke.key.as_str();
        let kind = match key {
            "d" | "D" => LayerKind::SignDial,
            "h" | "H" => LayerKind::Houses,
            "x" | "X" => LayerKind::Aspects,
            "p" | "P" => LayerKind::Bodies,
            "t" | "T" => LayerKind::Outer,
            "r" | "R" => {
                self.reset_time_offset(cx);
                return;
            }
            _ => return,
        };
        self.toggle_layer(kind, cx);
    }
}

// =====================================================================
// Geometría de pantalla
// =====================================================================

const WHEEL_SIZE: f32 = 580.0;
const WHEEL_MARGIN: f32 = 28.0;

fn bounds_center(bounds: Bounds<Pixels>) -> (f32, f32) {
    let ox: f32 = bounds.origin.x.into();
    let oy: f32 = bounds.origin.y.into();
    let bw: f32 = bounds.size.width.into();
    let bh: f32 = bounds.size.height.into();
    (ox + bw / 2.0, oy + bh / 2.0)
}

// =====================================================================
// Render
// =====================================================================

impl Render for AstrologyCanvas {
    fn render(&mut self, _w: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
        let theme = Theme::global(cx).clone();
        let palette = AstroPalette::for_theme(&theme);
        let entity = cx.entity();
        let focus = self.focus_handle.clone();

        let body = match &self.state.mode {
            CanvasMode::Empty => render_empty(&theme),
            CanvasMode::Wheel { render } => render_wheel(
                &theme,
                &palette,
                render,
                self.state.view_rotation_deg,
                self.state.time_offset_minutes,
                &self.state.layer_visibility,
                entity,
            ),
            CanvasMode::Thumbnails { items, .. } => render_thumbnails(&theme, items),
        };

        div()
            .id("astrology-canvas-root")
            .track_focus(&focus)
            .key_context("AstrologyCanvas")
            .on_key_down(cx.listener(Self::on_key_down))
            .on_mouse_down(
                MouseButton::Left,
                cx.listener(|this, _, w, _cx| {
                    w.focus(&this.focus_handle);
                }),
            )
            .size_full()
            .bg(theme.bg_panel.clone())
            .flex()
            .flex_col()
            .items_center()
            .justify_center()
            .child(body)
    }
}

// =====================================================================
// Modos: empty / thumbnails / wheel
// =====================================================================

fn render_empty(theme: &Theme) -> gpui::Div {
    div()
        .flex()
        .flex_col()
        .items_center()
        .justify_center()
        .gap(px(12.0))
        .child(
            div()
                .text_size(px(13.0))
                .text_color(theme.fg_muted)
                .child("Tahuantinsuyu"),
        )
        .child(
            div()
                .text_size(px(11.0))
                .text_color(theme.fg_disabled)
                .child("Seleccioná una carta en el árbol para empezar."),
        )
}

fn render_thumbnails(theme: &Theme, items: &[ThumbnailItem]) -> gpui::Div {
    if items.is_empty() {
        return div()
            .text_size(px(12.0))
            .text_color(theme.fg_muted)
            .child("Sin cartas en este grupo todavía.");
    }
    let mut row = div().flex().flex_row().flex_wrap().gap(px(12.0));
    for it in items {
        row = row.child(
            div()
                .w(px(140.0))
                .h(px(160.0))
                .rounded(px(6.0))
                .border_1()
                .border_color(theme.border)
                .bg(theme.bg_panel_alt.clone())
                .flex()
                .flex_col()
                .items_center()
                .justify_end()
                .pb(px(8.0))
                .child(
                    div()
                        .text_size(px(11.0))
                        .text_color(theme.fg_text)
                        .child(it.label.clone()),
                ),
        );
    }
    row
}

// =====================================================================
// Wheel
// =====================================================================

#[allow(clippy::too_many_arguments)]
fn render_wheel(
    theme: &Theme,
    palette: &AstroPalette,
    render: &RenderModel,
    view_rotation_deg: f32,
    time_offset_minutes: i64,
    layer_visibility: &HashMap<LayerKind, bool>,
    entity: gpui::Entity<AstrologyCanvas>,
) -> gpui::Div {
    let asc = render.ascendant_deg;
    let rot_offset = view_rotation_deg;
    let cx_center = WHEEL_SIZE / 2.0;
    let cy_center = WHEEL_SIZE / 2.0;
    let r_outer = (WHEEL_SIZE - WHEEL_MARGIN * 2.0) / 2.0;
    let radii = Radii::from_outer(r_outer);

    let visible = layer_visibility.clone();

    // --- Canvas element con todo el trazo + jog-dial drag ---
    let palette_paint = palette.clone();
    let theme_paint = theme.clone();
    let layers_paint: Vec<Layer> = render.layers.clone();
    let asc_for_paint = asc;
    let mc_for_paint = render.midheaven_deg;
    let visibility_for_paint = visible.clone();
    let entity_for_canvas = entity.clone();
    let canvas_element = canvas(
        move |_b: Bounds<Pixels>, _w, _cx| (),
        move |bounds: Bounds<Pixels>, _, window, _| {
            // Painting de la rueda.
            paint_wheel(
                bounds,
                window,
                &theme_paint,
                &palette_paint,
                &layers_paint,
                asc_for_paint,
                mc_for_paint,
                rot_offset,
                radii,
                &visibility_for_paint,
            );

            // Handlers de mouse para el jog-dial — se registran cada
            // frame contra el window; GPUI los reemplaza al re-renderear.
            let entity_d = entity_for_canvas.clone();
            window.on_mouse_event(move |ev: &MouseDownEvent, _, _w, cx| {
                if ev.button != MouseButton::Left {
                    return;
                }
                if !bounds.contains(&ev.position) {
                    return;
                }
                entity_d.update(cx, |this, cx| this.on_jog_down(ev.position, bounds, cx));
            });
            let entity_m = entity_for_canvas.clone();
            window.on_mouse_event(move |ev: &MouseMoveEvent, _, _w, cx| {
                if !ev.dragging() {
                    return;
                }
                entity_m.update(cx, |this, cx| this.on_jog_move(ev.position, bounds, cx));
            });
            let entity_u = entity_for_canvas.clone();
            window.on_mouse_event(move |_: &MouseUpEvent, _, _w, cx| {
                entity_u.update(cx, |this, cx| this.on_jog_up(cx));
            });
        },
    )
    .absolute()
    .w(px(WHEEL_SIZE))
    .h(px(WHEEL_SIZE));

    let mut wheel = div()
        .relative()
        .w(px(WHEEL_SIZE))
        .h(px(WHEEL_SIZE))
        .child(canvas_element);

    // Sign glyphs.
    if visible.get(&LayerKind::SignDial).copied().unwrap_or(true) {
        let sign_ring_mid = (radii.sign_outer + radii.sign_inner) / 2.0;
        for layer in &render.layers {
            if matches!(layer.kind, LayerKind::SignDial) {
                for g in &layer.glyphs {
                    let (x, y) = polar_to_screen(g.deg, asc, rot_offset, sign_ring_mid);
                    let color = element_color_for_sign(palette, &g.symbol);
                    wheel = wheel.child(centered_glyph(
                        cx_center + x,
                        cy_center + y,
                        20.0,
                        18.0,
                        sign_unicode(&g.symbol).into(),
                        color,
                    ));
                }
            }
        }
    }

    // House numbers.
    if visible.get(&LayerKind::Houses).copied().unwrap_or(true) {
        let house_label_r = (radii.houses_outer + radii.houses_inner) / 2.0;
        for layer in &render.layers {
            if matches!(layer.kind, LayerKind::Houses) {
                for g in &layer.glyphs {
                    let (x, y) = polar_to_screen(g.deg, asc, rot_offset, house_label_r);
                    if let Some(h) = g.house {
                        wheel = wheel.child(centered_glyph(
                            cx_center + x,
                            cy_center + y,
                            16.0,
                            10.0,
                            format!("{}", h).into(),
                            palette.house_cusp,
                        ));
                    }
                }
            }
        }
    }

    // Planet glyphs: natal (en `bodies`) + overlays en sus rings
    // (progression, solar_arc) con alpha + tamaño más chico para
    // diferenciarse visualmente del natal.
    if visible.get(&LayerKind::Bodies).copied().unwrap_or(true) {
        for layer in &render.layers {
            if matches!(layer.kind, LayerKind::Bodies) {
                let is_natal = layer.module_id == "natal";
                let ring = radii.body_ring(&layer.module_id);
                let alpha = if is_natal { 1.0 } else { 0.85 };
                let font_size = if is_natal { 18.0 } else { 14.0 };
                let box_size = if is_natal { 24.0 } else { 20.0 };
                for g in &layer.glyphs {
                    let (x, y) = polar_to_screen(g.deg, asc, rot_offset, ring);
                    let color = with_alpha(planet_color(palette, &g.symbol), alpha);
                    let glyph_text = if g.retrograde {
                        format!("{}ᴿ", planet_unicode(&g.symbol))
                    } else {
                        planet_unicode(&g.symbol).into()
                    };
                    wheel = wheel.child(centered_glyph(
                        cx_center + x,
                        cy_center + y,
                        box_size,
                        font_size,
                        glyph_text.into(),
                        color,
                    ));
                }
            }
        }
    }

    // Planet glyphs (transit ring) — solo si la capa Outer está activa.
    if visible.get(&LayerKind::Outer).copied().unwrap_or(true) {
        for layer in &render.layers {
            if matches!(layer.kind, LayerKind::Outer) && layer.module_id == "transit" {
                for g in &layer.glyphs {
                    let (x, y) = polar_to_screen(g.deg, asc, rot_offset, radii.transits);
                    let color = with_alpha(planet_color(palette, &g.symbol), 0.9);
                    let glyph_text = if g.retrograde {
                        format!("{}ᴿ", planet_unicode(&g.symbol))
                    } else {
                        planet_unicode(&g.symbol).into()
                    };
                    wheel = wheel.child(centered_glyph(
                        cx_center + x,
                        cy_center + y,
                        20.0,
                        14.0,
                        glyph_text.into(),
                        color,
                    ));
                }
            }
        }
    }

    // --- Header + footer + indicador de tiempo ---
    let header = div()
        .flex()
        .flex_col()
        .items_center()
        .gap(px(2.0))
        .child(
            div()
                .text_size(px(16.0))
                .text_color(theme.fg_text)
                .child(SharedString::from(render.title.clone())),
        );
    let header = if let Some(sub) = &render.subtitle {
        header.child(
            div()
                .text_size(px(11.0))
                .text_color(theme.fg_muted)
                .child(SharedString::from(sub.clone())),
        )
    } else {
        header
    };

    let offset_label = format_offset(time_offset_minutes);
    let offset_color = if time_offset_minutes == 0 {
        theme.fg_disabled
    } else {
        palette.angle_highlight
    };
    let footer = div()
        .flex()
        .flex_row()
        .gap(px(10.0))
        .child(
            div()
                .text_size(px(10.0))
                .text_color(theme.fg_disabled)
                .child(SharedString::from(format!(
                    "Asc {:.1}°  ·  MC {:.1}°  ·  {} ms",
                    render.ascendant_deg, render.midheaven_deg, render.compute_ms,
                ))),
        )
        .child(
            div()
                .text_size(px(10.0))
                .text_color(offset_color)
                .child(SharedString::from(offset_label)),
        )
        .child(
            div()
                .text_size(px(10.0))
                .text_color(theme.fg_disabled)
                .child("[D]ial [H]ouses as[X]pects [P]lanets [T]ransits [R]eset"),
        );

    div()
        .flex()
        .flex_col()
        .items_center()
        .gap(px(8.0))
        .child(header)
        .child(wheel)
        .child(footer)
}

fn format_offset(minutes: i64) -> String {
    if minutes == 0 {
        return "⏱ ahora".to_string();
    }
    let sign = if minutes > 0 { '+' } else { '-' };
    let m = minutes.unsigned_abs();
    let days = m / (60 * 24);
    let hours = (m / 60) % 24;
    let mins = m % 60;
    if days > 0 {
        format!("⏱ {}{}d {:02}h {:02}m", sign, days, hours, mins)
    } else if hours > 0 {
        format!("⏱ {}{:02}h {:02}m", sign, hours, mins)
    } else {
        format!("⏱ {}{:02}m", sign, mins)
    }
}

// =====================================================================
// Painting
// =====================================================================

#[derive(Clone, Copy)]
struct Radii {
    sign_outer: f32,
    sign_inner: f32,
    /// Anillo de glifos de tránsito (cuando el overlay está activo).
    transits: f32,
    houses_outer: f32,
    houses_inner: f32,
    bodies: f32,
    /// Anillo interno con cuerpos progresados (overlay opcional).
    progression: f32,
    /// Anillo más interno con cuerpos dirigidos por Solar Arc (overlay
    /// opcional). Si tanto progression como solar_arc están activos,
    /// progression va afuera (más cerca de bodies natales) y solar_arc
    /// adentro (entre progression y aspects).
    solar_arc: f32,
    aspects: f32,
}

impl Radii {
    fn from_outer(r: f32) -> Self {
        Self {
            sign_outer: r,
            sign_inner: r * 0.88,
            transits: r * 0.82,
            houses_outer: r * 0.78,
            houses_inner: r * 0.66,
            bodies: r * 0.58,
            progression: r * 0.48,
            solar_arc: r * 0.40,
            aspects: r * 0.32,
        }
    }

    /// Radio del ring de cuerpos según el `module_id` del Layer.
    fn body_ring(&self, module_id: &str) -> f32 {
        match module_id {
            "progression" => self.progression,
            "solar_arc" => self.solar_arc,
            _ => self.bodies,
        }
    }

    /// Resuelve qué radios corresponden a una capa de aspectos según el
    /// `module_id`: natal-natal en `aspects`, cross con cada overlay
    /// desde `bodies` (extremo natal) al ring del módulo.
    fn aspect_endpoints(&self, module_id: &str) -> (f32, f32) {
        match module_id {
            "transit" => (self.bodies, self.transits),
            "progression" => (self.bodies, self.progression),
            "solar_arc" => (self.bodies, self.solar_arc),
            _ => (self.aspects, self.aspects),
        }
    }
}

#[allow(clippy::too_many_arguments)]
fn paint_wheel(
    bounds: Bounds<Pixels>,
    window: &mut Window,
    theme: &Theme,
    palette: &AstroPalette,
    layers: &[Layer],
    ascendant_deg: f32,
    midheaven_deg: f32,
    rot_offset_deg: f32,
    radii: Radii,
    visibility: &HashMap<LayerKind, bool>,
) {
    let (cx, cy) = bounds_center(bounds);
    let _ = theme;
    let show = |k: LayerKind| visibility.get(&k).copied().unwrap_or(true);

    // 1. Sectores zodiacales (parte del SignDial layer).
    if show(LayerKind::SignDial) {
        paint_sign_sectors(window, cx, cy, &radii, palette, ascendant_deg, rot_offset_deg);

        // Anillos del dial.
        stroke_circle(window, cx, cy, radii.sign_outer, 1.5, palette.dial_ring);
        stroke_circle(window, cx, cy, radii.sign_inner, 1.0, palette.dial_ring);

        // Cusps zodiacales cada 30°.
        for i in 0..12 {
            let lon = (i as f32) * 30.0;
            let color = palette.dial_ring;
            paint_radial_line(
                window,
                cx,
                cy,
                lon,
                ascendant_deg,
                rot_offset_deg,
                radii.sign_inner,
                radii.sign_outer,
                color,
                1.0,
            );
        }
    }

    // 2. Casas — cusps radiales + énfasis Asc/IC/Desc/MC.
    if show(LayerKind::Houses) {
        stroke_circle(
            window,
            cx,
            cy,
            radii.houses_inner,
            0.8,
            with_alpha(palette.house_cusp, 0.6),
        );

        for layer in layers {
            if matches!(layer.kind, LayerKind::Houses) {
                if let Geometry::Ring { cusps_deg } = &layer.geometry {
                    for (i, c) in cusps_deg.iter().enumerate() {
                        let is_angle = i == 0 || i == 3 || i == 6 || i == 9;
                        let color = if is_angle {
                            palette.angle_highlight
                        } else {
                            with_alpha(palette.house_cusp, 0.7)
                        };
                        let width = if is_angle { 2.0 } else { 0.8 };
                        paint_radial_line(
                            window,
                            cx,
                            cy,
                            *c,
                            ascendant_deg,
                            rot_offset_deg,
                            radii.houses_inner,
                            radii.houses_outer,
                            color,
                            width,
                        );
                    }
                }
            }
        }

        // Asc + MC extendidos hasta el centro con opacidad sutil.
        paint_radial_line(
            window,
            cx,
            cy,
            ascendant_deg,
            ascendant_deg,
            rot_offset_deg,
            0.0,
            radii.houses_outer,
            with_alpha(palette.angle_highlight, 0.35),
            1.0,
        );
        paint_radial_line(
            window,
            cx,
            cy,
            midheaven_deg,
            ascendant_deg,
            rot_offset_deg,
            0.0,
            radii.houses_outer,
            with_alpha(palette.angle_highlight, 0.35),
            1.0,
        );
    }

    // 3. Aspectos. Cada module_id usa su par de radios — natal-natal
    // ambos en `aspects`, cross con transit en `bodies → transits`,
    // cross con progression en `bodies → progression`.
    if show(LayerKind::Aspects) {
        for layer in layers {
            if matches!(layer.kind, LayerKind::Aspects) {
                if let Geometry::Lines(segs) = &layer.geometry {
                    let (r_from, r_to) = radii.aspect_endpoints(&layer.module_id);
                    let is_cross = r_from != r_to;
                    for seg in segs {
                        let color = aspect_color(palette, &seg.kind);
                        let color = with_alpha(color, color.a * seg.opacity);
                        if is_cross {
                            paint_cross_aspect_line(
                                window,
                                cx,
                                cy,
                                seg.from_deg,
                                seg.to_deg,
                                ascendant_deg,
                                rot_offset_deg,
                                r_from,
                                r_to,
                                color,
                            );
                        } else {
                            paint_aspect_line(
                                window,
                                cx,
                                cy,
                                seg.from_deg,
                                seg.to_deg,
                                ascendant_deg,
                                rot_offset_deg,
                                r_from,
                                color,
                            );
                        }
                    }
                }
            }
        }
    }

    // 4. Dots de cuerpos: natal en `bodies`, overlays en sus rings
    // específicos (progression, solar_arc).
    if show(LayerKind::Bodies) {
        let dot_r = (radii.sign_outer * 0.018).max(2.0);
        for layer in layers {
            if matches!(layer.kind, LayerKind::Bodies) {
                let ring = radii.body_ring(&layer.module_id);
                let alpha = if layer.module_id == "natal" { 1.0 } else { 0.85 };
                for g in &layer.glyphs {
                    let color = with_alpha(planet_color(palette, &g.symbol), alpha);
                    let (x, y) = polar_to_screen(g.deg, ascendant_deg, rot_offset_deg, ring);
                    fill_circle(window, cx + x, cy + y, dot_r, color);
                }
            }
        }
    }

    // Anillos guía para los overlays internos (progression, solar_arc).
    let guide_inset = radii.sign_outer * 0.03;
    for (module_id, ring) in [
        ("progression", radii.progression),
        ("solar_arc", radii.solar_arc),
    ] {
        let active = layers
            .iter()
            .any(|l| matches!(l.kind, LayerKind::Bodies) && l.module_id == module_id);
        if active {
            stroke_circle(
                window,
                cx,
                cy,
                ring + guide_inset,
                0.5,
                with_alpha(palette.house_cusp, 0.35),
            );
            stroke_circle(
                window,
                cx,
                cy,
                ring - guide_inset,
                0.5,
                with_alpha(palette.house_cusp, 0.35),
            );
        }
    }

    // 5. Outer ring (transit overlay): anillo guía + dots de transit.
    let transit_active = layers
        .iter()
        .any(|l| matches!(l.kind, LayerKind::Outer) && l.module_id == "transit");
    if transit_active && show(LayerKind::Outer) {
        // Anillos guía para delimitar el slot.
        stroke_circle(
            window,
            cx,
            cy,
            radii.transits + radii.sign_outer * 0.035,
            0.6,
            with_alpha(palette.dial_ring, 0.4),
        );
        stroke_circle(
            window,
            cx,
            cy,
            radii.transits - radii.sign_outer * 0.035,
            0.6,
            with_alpha(palette.dial_ring, 0.4),
        );

        let dot_r = (radii.sign_outer * 0.017).max(2.0);
        for layer in layers {
            if matches!(layer.kind, LayerKind::Outer) && layer.module_id == "transit" {
                for g in &layer.glyphs {
                    let color = with_alpha(planet_color(palette, &g.symbol), 0.85);
                    let (x, y) =
                        polar_to_screen(g.deg, ascendant_deg, rot_offset_deg, radii.transits);
                    fill_circle(window, cx + x, cy + y, dot_r, color);
                }
            }
        }
    }
}

fn paint_sign_sectors(
    window: &mut Window,
    cx: f32,
    cy: f32,
    radii: &Radii,
    palette: &AstroPalette,
    ascendant_deg: f32,
    rot_offset_deg: f32,
) {
    const SUBDIVISIONS: usize = 18;
    for i in 0..12 {
        let lon_start = (i as f32) * 30.0;
        let lon_end = lon_start + 30.0;
        let element = sign_element_by_index(i);
        let color = with_alpha(palette.element(element), 0.10);

        let mut builder = PathBuilder::fill();
        let (x0, y0) = polar_to_screen(lon_start, ascendant_deg, rot_offset_deg, radii.sign_inner);
        builder.move_to(point(px(cx + x0), px(cy + y0)));

        for k in 1..=SUBDIVISIONS {
            let t = lon_start + (lon_end - lon_start) * (k as f32) / (SUBDIVISIONS as f32);
            let (x, y) = polar_to_screen(t, ascendant_deg, rot_offset_deg, radii.sign_inner);
            builder.line_to(point(px(cx + x), px(cy + y)));
        }
        let (xe, ye) = polar_to_screen(lon_end, ascendant_deg, rot_offset_deg, radii.sign_outer);
        builder.line_to(point(px(cx + xe), px(cy + ye)));

        for k in (0..SUBDIVISIONS).rev() {
            let t = lon_start + (lon_end - lon_start) * (k as f32) / (SUBDIVISIONS as f32);
            let (x, y) = polar_to_screen(t, ascendant_deg, rot_offset_deg, radii.sign_outer);
            builder.line_to(point(px(cx + x), px(cy + y)));
        }
        builder.close();
        if let Ok(path) = builder.build() {
            window.paint_path(path, color);
        }
    }
}

fn stroke_circle(window: &mut Window, cx: f32, cy: f32, r: f32, width: f32, color: Hsla) {
    const SEGMENTS: usize = 96;
    let mut builder = PathBuilder::stroke(px(width));
    for i in 0..=SEGMENTS {
        let t = (i as f32) / (SEGMENTS as f32) * (2.0 * PI);
        let x = cx + r * t.cos();
        let y = cy + r * t.sin();
        if i == 0 {
            builder.move_to(point(px(x), px(y)));
        } else {
            builder.line_to(point(px(x), px(y)));
        }
    }
    if let Ok(path) = builder.build() {
        window.paint_path(path, color);
    }
}

fn fill_circle(window: &mut Window, cx: f32, cy: f32, r: f32, color: Hsla) {
    const SEGMENTS: usize = 32;
    let mut builder = PathBuilder::fill();
    builder.move_to(point(px(cx + r), px(cy)));
    for i in 1..=SEGMENTS {
        let t = (i as f32) / (SEGMENTS as f32) * (2.0 * PI);
        let x = cx + r * t.cos();
        let y = cy + r * t.sin();
        builder.line_to(point(px(x), px(y)));
    }
    builder.close();
    if let Ok(path) = builder.build() {
        window.paint_path(path, color);
    }
}

#[allow(clippy::too_many_arguments)]
fn paint_radial_line(
    window: &mut Window,
    cx: f32,
    cy: f32,
    longitude_deg: f32,
    ascendant_deg: f32,
    rot_offset_deg: f32,
    r_inner: f32,
    r_outer: f32,
    color: Hsla,
    width: f32,
) {
    let (xi, yi) = polar_to_screen(longitude_deg, ascendant_deg, rot_offset_deg, r_inner);
    let (xo, yo) = polar_to_screen(longitude_deg, ascendant_deg, rot_offset_deg, r_outer);
    let mut builder = PathBuilder::stroke(px(width));
    builder.move_to(point(px(cx + xi), px(cy + yi)));
    builder.line_to(point(px(cx + xo), px(cy + yo)));
    if let Ok(path) = builder.build() {
        window.paint_path(path, color);
    }
}

#[allow(clippy::too_many_arguments)]
fn paint_aspect_line(
    window: &mut Window,
    cx: f32,
    cy: f32,
    a_deg: f32,
    b_deg: f32,
    ascendant_deg: f32,
    rot_offset_deg: f32,
    r: f32,
    color: Hsla,
) {
    let (xa, ya) = polar_to_screen(a_deg, ascendant_deg, rot_offset_deg, r);
    let (xb, yb) = polar_to_screen(b_deg, ascendant_deg, rot_offset_deg, r);
    let mut builder = PathBuilder::stroke(px(1.0));
    builder.move_to(point(px(cx + xa), px(cy + ya)));
    builder.line_to(point(px(cx + xb), px(cy + yb)));
    if let Ok(path) = builder.build() {
        window.paint_path(path, color);
    }
}

/// Línea de aspecto natal ↔ tránsito: extremos en radios distintos.
/// El `from_deg` cae sobre el ring de cuerpos natales (`r_from`); el
/// `to_deg` sobre el ring de tránsito (`r_to`). Trazo más fino que el
/// natal-natal para no competir visualmente.
#[allow(clippy::too_many_arguments)]
fn paint_cross_aspect_line(
    window: &mut Window,
    cx: f32,
    cy: f32,
    natal_deg: f32,
    transit_deg: f32,
    ascendant_deg: f32,
    rot_offset_deg: f32,
    r_from: f32,
    r_to: f32,
    color: Hsla,
) {
    let (xa, ya) = polar_to_screen(natal_deg, ascendant_deg, rot_offset_deg, r_from);
    let (xb, yb) = polar_to_screen(transit_deg, ascendant_deg, rot_offset_deg, r_to);
    let mut builder = PathBuilder::stroke(px(0.7));
    builder.move_to(point(px(cx + xa), px(cy + ya)));
    builder.line_to(point(px(cx + xb), px(cy + yb)));
    if let Ok(path) = builder.build() {
        window.paint_path(path, color);
    }
}

// =====================================================================
// Helpers
// =====================================================================

fn polar_to_screen(
    longitude_deg: f32,
    ascendant_deg: f32,
    rot_offset_deg: f32,
    radius: f32,
) -> (f32, f32) {
    let deg = 180.0 - (longitude_deg - ascendant_deg + rot_offset_deg);
    let rad = deg * PI / 180.0;
    (radius * rad.cos(), radius * rad.sin())
}

fn centered_glyph(
    x: f32,
    y: f32,
    box_size: f32,
    font_size: f32,
    text: SharedString,
    color: Hsla,
) -> gpui::Div {
    div()
        .absolute()
        .left(px(x - box_size / 2.0))
        .top(px(y - box_size / 2.0))
        .w(px(box_size))
        .h(px(box_size))
        .flex()
        .items_center()
        .justify_center()
        .text_size(px(font_size))
        .text_color(color)
        .child(text)
}

fn with_alpha(c: Hsla, a: f32) -> Hsla {
    hsla(c.h, c.s, c.l, a.clamp(0.0, 1.0))
}

fn sign_unicode(name: &str) -> &'static str {
    match name {
        "aries" => "♈",
        "taurus" => "♉",
        "gemini" => "♊",
        "cancer" => "♋",
        "leo" => "♌",
        "virgo" => "♍",
        "libra" => "♎",
        "scorpio" => "♏",
        "sagittarius" => "♐",
        "capricorn" => "♑",
        "aquarius" => "♒",
        "pisces" => "♓",
        _ => "?",
    }
}

fn planet_unicode(name: &str) -> &'static str {
    match name {
        "sun" => "☉",
        "moon" => "☽",
        "mercury" => "☿",
        "venus" => "♀",
        "mars" => "♂",
        "jupiter" => "♃",
        "saturn" => "♄",
        "uranus" => "♅",
        "neptune" => "♆",
        "pluto" => "♇",
        "north_node" => "☊",
        "south_node" => "☋",
        "chiron" => "⚷",
        "lilith" => "⚸",
        "ceres" => "⚳",
        "pallas" => "⚴",
        "juno" => "⚵",
        "vesta" => "⚶",
        _ => "•",
    }
}

fn planet_color(p: &AstroPalette, name: &str) -> Hsla {
    let planet = match name {
        "sun" => Planet::Sun,
        "moon" => Planet::Moon,
        "mercury" => Planet::Mercury,
        "venus" => Planet::Venus,
        "mars" => Planet::Mars,
        "jupiter" => Planet::Jupiter,
        "saturn" => Planet::Saturn,
        "uranus" => Planet::Uranus,
        "neptune" => Planet::Neptune,
        "pluto" => Planet::Pluto,
        "chiron" => Planet::Chiron,
        "north_node" => Planet::NorthNode,
        "south_node" => Planet::SouthNode,
        "lilith" => Planet::Lilith,
        _ => return p.fg_text_fallback(),
    };
    p.planet(planet)
}

fn sign_element_by_index(i: usize) -> Element {
    match i % 4 {
        0 => Element::Fire,
        1 => Element::Earth,
        2 => Element::Air,
        _ => Element::Water,
    }
}

fn element_color_for_sign(p: &AstroPalette, name: &str) -> Hsla {
    let elem = match name {
        "aries" | "leo" | "sagittarius" => Element::Fire,
        "taurus" | "virgo" | "capricorn" => Element::Earth,
        "gemini" | "libra" | "aquarius" => Element::Air,
        "cancer" | "scorpio" | "pisces" => Element::Water,
        _ => return p.fg_text_fallback(),
    };
    p.element(elem)
}

fn aspect_color(p: &AstroPalette, kind: &str) -> Hsla {
    let k = match kind {
        "conjunction" => TAspectKind::Conjunction,
        "opposition" => TAspectKind::Opposition,
        "trine" => TAspectKind::Trine,
        "square" => TAspectKind::Square,
        "sextile" => TAspectKind::Sextile,
        "quincunx" => TAspectKind::Quincunx,
        "semi_sextile" => TAspectKind::Semisextile,
        "semi_square" => TAspectKind::Semisquare,
        "sesquiquadrate" => TAspectKind::Sesquisquare,
        "quintile" => TAspectKind::Quintile,
        "biquintile" => TAspectKind::Biquintile,
        _ => return p.minor_aspect,
    };
    p.aspect(k)
}

trait AstroPaletteExt {
    fn fg_text_fallback(&self) -> Hsla;
}

impl AstroPaletteExt for AstroPalette {
    fn fg_text_fallback(&self) -> Hsla {
        if self.is_dark {
            hsla(0.0, 0.0, 0.85, 1.0)
        } else {
            hsla(0.0, 0.0, 0.25, 1.0)
        }
    }
}