BREP_render 0.15.0

//! The active PMI view's annotation graphics: dimension lines, extension
//! lines, arcs, leaders and arrowheads baked into the `pmi-overlay` group
//! from the kernel's presentation layout (the SAME layout the STEP file
//! writes), sized in pixels at bake time and re-baked when the zoom or the
//! viewing direction moves materially; plus the label feed the app's chip
//! pass draws.

use super::*;
use brep_kernel::{pmi_present, pmi_type, PmiLayoutStyle, PmiStatus};

const PMI_OVERLAY_GROUP: &str = "pmi-overlay";
/// Arrowhead length, in pixels.
pub(crate) const ARROW_PX: f64 = 12.0;
/// The reference text cap height at 12 pt, in pixels (frames scale with the
/// view's text size).
pub(crate) const TEXT_PX_AT_12PT: f64 = 11.0;
/// PMI line / arrow colour (amber, distinct from the dimension gizmo's rods
/// and the constraint status colours).
const PMI_RGB: [f32; 3] = [0.98, 0.78, 0.22];
/// An exploded view's trace arrows and the instructions' insertion arrows:
/// black on a light ground, near-white on the dark viewport.
const EXPLODE_ARROW_RGB: [f32; 3] = [0.0, 0.0, 0.0];
const EXPLODE_ARROW_ON_DARK_RGB: [f32; 3] = [0.92, 0.94, 0.96];
/// Their filled head's length on screen, px (the reference frames' ~20 px;
/// its width is 0.7 of it).
const INSERTION_HEAD_PX: f64 = 20.0;
/// An error annotation's chip colour.
const ERROR_RGB: [f32; 3] = [0.97, 0.32, 0.29];
/// A disabled annotation's chip colour.
const DISABLED_RGB: [f32; 3] = [0.55, 0.55, 0.55];
/// The error a balloon shows while its target is hidden in the viewport and
/// the view's hidden list has not caught up (no run has happened).
pub(crate) const LIVE_HIDDEN_MESSAGE: &str = "target hidden in the viewport: show it, or update the view's visibility";

/// One chip of [`EngineState::pmi_labels`]; serialised, the
/// `__brepPmiLabels` row.
#[derive(Debug, Clone, PartialEq, serde::Serialize)]
#[serde(rename_all = "camelCase")]
pub struct PmiLabel {
    pub id: String,
    #[serde(rename = "type")]
    pub kind: String,
    pub icon: &'static str,
    /// What the chip reads: the resolved text, or the type's glyph and the
    /// id for an error or an empty one.
    pub text: String,
    /// `ok` or `error`.
    pub status: &'static str,
    pub message: String,
    pub color: [f32; 3],
    /// The label anchor, world coordinates.
    pub world: [f64; 3],
    pub enabled: bool,
    /// Its form is open.
    pub open: bool,
    /// Selected in the PMI tree.
    pub selected: bool,
    pub text_size_pt: f64,
}

impl EngineState {
    /// Re-bake the overlay from the cached report (empty without an active
    /// view or while a sketch edit is live).
    pub fn refresh_pmi_overlay(&mut self) {
        let Some(active) = self.pmi_active_view.clone() else {
            self.clear_pmi_overlay();
            return;
        };
        if self.any_sketch_mode() {
            self.clear_pmi_overlay();
            return;
        }
        // Camera movement changes an automatic leader's closest screen point.
        // Fetch missing topology in one batch; the topology callback retries
        // this bake once the last pending balloon can be projected.
        let camera = self.snapshot_camera();
        let ids: Vec<String> = self.pmi_report.as_ref().and_then(|r| r.view(&active))
            .map(|v| v.annotations.iter().filter(|row| matches!(&row.geometry,
                brep_kernel::PmiGeometry::Leader { anchor: Some(a), balloon: true, .. }
                if matches!(a.mode, brep_kernel::BalloonAnchorMode::Surface) && a.camera.as_ref() != Some(&camera)))
                .map(|row| row.id.clone()).collect()).unwrap_or_default();
        let mut missing = Vec::new();
        for id in &ids {
            if let Some(names) = self.pmi_balloon_head_now(id) {
                missing.extend(names);
                self.pmi_balloon_stale = Some(id.clone());
            }
        }
        if !missing.is_empty() {
            missing.sort();
            missing.dedup();
            self.request_exact_solids(missing.iter().map(String::as_str));
            for id in &ids { let _ = self.pmi_balloon_head_now(id); }
        }
        // Borrowed, not cloned: a 500-step view's rows are ~4 ms to copy, every
        // animation frame. Nothing below writes `self` until the bake is done.
        let Some(view) = self.pmi_report.as_ref().and_then(|report| report.view(&active)) else {
            self.clear_pmi_overlay();
            return;
        };
        let text_size = self
            .pmi_state_shared()
            .find_view(&active)
            .map(|view| view.display.text_size_pt)
            .unwrap_or(12.0);
        let wpp = self.camera.world_per_pixel();
        let (_, up, view_dir) = self.camera.basis();
        let style = PmiLayoutStyle {
            arrow: ARROW_PX * wpp,
            text_height: TEXT_PX_AT_12PT * wpp * (text_size / 12.0),
            view_dir,
            view_up: up,
            plane: None,
        };
        let mut lines: Vec<f32> = Vec::new();
        let mut line_colors: Vec<f32> = Vec::new();
        let mut tris: Vec<f32> = Vec::new();
        let mut tri_colors: Vec<f32> = Vec::new();
        let mut explode_step = 0;
        let mut arrows: Vec<([f64; 3], [f64; 3])> = Vec::new();
        // Part-way through playback, a balloon rides its moving target.
        let playback = self.explode_playback_poses();
        for row in &view.annotations {
            if !row.enabled || row.status != PmiStatus::Ok || self.balloon_target_hidden_live(row) {
                continue;
            }
            // An explode trail follows its step's playback fraction, like its bodies.
            let geometry = if matches!(row.geometry, brep_kernel::PmiGeometry::Explode { .. }) {
                explode_step += 1;
                super::exploded_ops::explode_at(&row.geometry, self.explode_fraction(explode_step - 1))
            } else {
                playback.as_ref().and_then(|poses| poses.shown_geometry(row)).unwrap_or_else(|| row.geometry.clone())
            };
            let label = playback.as_ref().map_or(row.label_world, |poses| poses.shown(row, row.label_world));
            // A picked annotation plane lays the row out in that plane.
            let row_style = PmiLayoutStyle {
                plane: row.plane,
                ..style
            };
            // An explode trace is an insertion arrow (`arrows` below), drawn
            // from the parts where they stand to their seat.
            if let brep_kernel::PmiGeometry::Explode { solids, translate, trace, .. } = &geometry {
                if *trace {
                    let mut now = crate::camera::Aabb::empty();
                    for solid in self.scene.solids() {
                        if solids.iter().any(|s| solid.name == *s || solid.name.strip_prefix(s.as_str()).is_some_and(|rest| rest.starts_with(':'))) {
                            now.union(&solid.bbox);
                        }
                    }
                    if !now.is_empty() {
                        let home = crate::camera::Aabb {
                            min: std::array::from_fn(|k| now.min[k] - translate[k]),
                            max: std::array::from_fn(|k| now.max[k] - translate[k]),
                        };
                        arrows.extend(self.outline_arrow(&home, *translate));
                    }
                }
                continue;
            }
            let drawn = pmi_present(&geometry, label, &row.text, &row_style);
            let rgb = PMI_RGB;
            for polyline in &drawn.polylines {
                for pair in polyline.windows(2) {
                    for point in pair {
                        lines.extend(point.iter().map(|c| *c as f32));
                        line_colors.extend_from_slice(&rgb);
                    }
                }
            }
            for arrow in &drawn.arrows {
                for point in arrow {
                    tris.extend(point.iter().map(|c| *c as f32));
                    tri_colors.extend_from_slice(&rgb);
                }
                // Both windings, so the arrowhead reads from either side.
                for point in [arrow[0], arrow[2], arrow[1]] {
                    tris.extend(point.iter().map(|c| *c as f32));
                    tri_colors.extend_from_slice(&rgb);
                }
            }
        }
        // The exploded view's traces and the instructions player's insertion
        // arrows: a thin solid line from each moving part to its seat and a
        // filled head there (owner 2026-11-07), in ink that reads on the
        // ground: black on a light one (a Line art step's), near-white on
        // the dark viewport.
        arrows.extend(self.instructions_insertion_arrows());
        let ground = if self.scene.line_art.is_some() { crate::thumbnail::line_art::BACKGROUND } else { self.settings.background };
        let light = 0.2126 * ground[0] + 0.7152 * ground[1] + 0.0722 * ground[2] > 0.5;
        let ink = if light { EXPLODE_ARROW_RGB } else { EXPLODE_ARROW_ON_DARK_RGB };
        for (tail, tip) in arrows {
            let d = [tip[0] - tail[0], tip[1] - tail[1], tip[2] - tail[2]];
            let length = (d[0] * d[0] + d[1] * d[1] + d[2] * d[2]).sqrt();
            if !(length > 1e-9) {
                continue;
            }
            let d = d.map(|v| v / length);
            let head = (INSERTION_HEAD_PX * wpp).min(length * 0.6);
            let w = crate::geometry3d::cross3(view_dir, d);
            let wl = (w[0] * w[0] + w[1] * w[1] + w[2] * w[2]).sqrt();
            let w = if wl > 1e-9 { w.map(|v| v / wl) } else { up };
            let base: [f64; 3] = std::array::from_fn(|k| tip[k] - d[k] * head);
            for point in [tail, base] {
                lines.extend(point.iter().map(|c| *c as f32));
                line_colors.extend_from_slice(&ink);
            }
            let half = head * 0.35;
            let corners = [tip, std::array::from_fn(|k| base[k] + w[k] * half), std::array::from_fn(|k| base[k] - w[k] * half)];
            for point in [corners[0], corners[1], corners[2], corners[0], corners[2], corners[1]] {
                tris.extend(point.iter().map(|c| *c as f32));
                tri_colors.extend_from_slice(&ink);
            }
        }
        let group = if lines.is_empty() && tris.is_empty() {
            serde_json::json!({ "name": PMI_OVERLAY_GROUP })
        } else {
            serde_json::json!({
                "name": PMI_OVERLAY_GROUP,
                "renderOrder": 10001,
                "lines": { "positions": lines, "colors": line_colors },
                "tris": { "positions": tris, "colors": tri_colors },
            })
        };
        let _ = self.set_overlay_json(&serde_json::json!({ "groups": [group] }).to_string());
        self.pmi_overlay_key = Some((if wpp > 0.0 { wpp } else { f64::MIN_POSITIVE }, view_dir));
        self.dirty = true;
    }

    /// Whether a balloon row's target is hidden in the LIVE scene: every
    /// solid its recipe projects onto is invisible now. The kernel resolves
    /// against the view's stored hidden list; a hide made in the viewport
    /// after the run is only known here, so the leader is withheld and the
    /// chip reads as an error until the view's visibility is updated.
    pub(crate) fn balloon_target_hidden_live(&self, row: &brep_kernel::PmiAnnotationReport) -> bool {
        match &row.geometry {
            brep_kernel::PmiGeometry::Leader { balloon: true, anchor: Some(anchor), .. } => {
                !anchor.solids.is_empty()
                    && anchor
                        .solids
                        .iter()
                        .all(|name| self.scene.solid(name).is_none_or(|solid| !solid.visible))
            }
            _ => false,
        }
    }

    fn clear_pmi_overlay(&mut self) {
        if self.pmi_overlay_key.take().is_some() {
            let _ = self.set_overlay_json(
                &serde_json::json!({ "groups": [ { "name": PMI_OVERLAY_GROUP } ] }).to_string(),
            );
            self.dirty = true;
        }
    }

    /// Per-frame upkeep: re-bake when the zoom (>0.5 %) or the viewing
    /// direction (>0.5°) moved, so arrowheads stay pixel-sized and face the
    /// camera.
    pub fn ensure_pmi_overlay_current(&mut self) {
        let Some((baked_wpp, baked_dir)) = self.pmi_overlay_key else {
            if self.pmi_active_view.is_some() {
                self.refresh_pmi_overlay();
            }
            return;
        };
        if self.any_sketch_mode() {
            self.clear_pmi_overlay();
            return;
        }
        let wpp = self.camera.world_per_pixel();
        let (_, _, view_dir) = self.camera.basis();
        let dot = baked_dir[0] * view_dir[0] + baked_dir[1] * view_dir[1] + baked_dir[2] * view_dir[2];
        let camera = self.snapshot_camera();
        let balloon_camera_changed = self.pmi_report.as_ref()
            .and_then(|r| self.pmi_active_view.as_ref().and_then(|id| r.view(id)))
            .is_some_and(|v| v.annotations.iter().any(|row| matches!(&row.geometry,
                brep_kernel::PmiGeometry::Leader { anchor: Some(a), balloon: true, .. }
                if matches!(a.mode, brep_kernel::BalloonAnchorMode::Surface) && a.camera.as_ref() != Some(&camera))));
        if balloon_camera_changed || super::overlay_wpp_stale(baked_wpp, wpp) || dot < (0.5f64).to_radians().cos() {
            self.refresh_pmi_overlay();
        }
    }

    /// The label feed for the app's chip pass — the active view's
    /// annotations: `[{id, type, icon, text, status, message, color:[r,g,b],
    /// world:[x,y,z], enabled, open, selected, textSizePt}]`. Empty without an
    /// active view. The automation registry's copy of [`Self::pmi_labels`].
    pub fn pmi_labels_json(&self) -> String {
        serde_json::to_string(&self.pmi_labels()).unwrap_or_else(|_| "[]".into())
    }

    /// The label feed, typed: what the viewport's chip pass reads every
    /// frame. It reads the shared parse of the PMI block, so a frame with
    /// nothing changed builds the rows and nothing else.
    pub fn pmi_labels(&self) -> Vec<PmiLabel> {
        let Some(active) = self.pmi_active_view.as_deref() else {
            return Vec::new();
        };
        let Some(view) = self.pmi_report.as_ref().and_then(|report| report.view(active)) else {
            return Vec::new();
        };
        // An explode step's chip is an editing handle of the PMI workbench; an
        // exploded view shown from the Assembly workbench draws its bodies and
        // trails without them (`exploded_ops`).
        let explode_chips = matches!(self.settings.workbench.as_str(), "pmi" | "all");
        if !explode_chips && view.annotations.iter().all(|row| matches!(row.kind.as_str(), "explode" | "hide")) {
            return Vec::new();
        }
        let text_size = self
            .pmi_state_shared()
            .find_view(active)
            .map(|view| view.display.text_size_pt)
            .unwrap_or(12.0);
        // Part-way through playback a balloon rides its body.
        let playback = self.explode_playback_poses();
        // An explode step draws NO label in the 3D view (owner 2026-10-26:
        // "I don't want to see the exploded labels at all"): its name lives
        // in the PMI tree and the Assembly workbench's step list, and while
        // its form is open the transform gizmo stands on its parts. A hide
        // step draws nothing either: its bodies are not there to label.
        view.annotations
            .iter()
            .filter(|row| !matches!(row.kind.as_str(), "explode" | "hide"))
            .map(|row| {
                // A balloon whose target was hidden in the viewport AFTER
                // the run (the view's hidden list not yet updated) is an
                // error chip with no leader: the kernel's head is on a body
                // nobody sees.
                let (status, message) = if row.status == PmiStatus::Ok && self.balloon_target_hidden_live(row) {
                    (PmiStatus::Error, LIVE_HIDDEN_MESSAGE.to_string())
                } else {
                    (row.status, row.message.clone())
                };
                let color = if status == PmiStatus::Error {
                    ERROR_RGB
                } else if !row.enabled {
                    DISABLED_RGB
                } else {
                    PMI_RGB
                };
                let icon = pmi_type(&row.kind).map(|def| def.icon).unwrap_or("");
                let text = if status == PmiStatus::Error || row.text.is_empty() {
                    format!("{} {}", icon, row.id)
                } else {
                    row.text.clone()
                };
                PmiLabel {
                    id: row.id.clone(),
                    kind: row.kind.clone(),
                    icon,
                    text,
                    status: match status { PmiStatus::Ok => "ok", PmiStatus::Error => "error" },
                    message,
                    color,
                    world: playback.as_ref().map_or(row.label_world, |poses| poses.shown(row, row.label_world)),
                    enabled: row.enabled,
                    open: self.pmi_open_annotation.as_deref() == Some(row.id.as_str()),
                    selected: self.pmi_selected_annotation.as_deref() == Some(row.id.as_str()),
                    text_size_pt: text_size,
                }
            })
            .collect()
    }
}