const pptxgen = require("pptxgenjs");
const { execSync } = require("child_process");

// Fetch images as base64
const imageUrls = [
  "https://cdn.orris.care/cdss_images/662d53871e6a45e8449cdb1c36997039f7eb54f3af754123bc9cf1f3f070f19e.png",
  "https://cdn.orris.care/cdss_images/fa9bb1a7b5f9abc6a745819dc04df9d3494b7791716f3c282ae4568f8a164f57.png",
  "https://cdn.orris.care/cdss_images/3a03843f23040e9ddd61caa77864caf4c1f75a3c6d6272a7878ea5b689ed4e23.png"
];

let images = [];
try {
  const result = execSync(
    `node /home/daytona/skills/shared/scripts/fetch_images.js ${imageUrls.map(u => `"${u}"`).join(" ")}`,
    { maxBuffer: 50 * 1024 * 1024 }
  ).toString();
  images = JSON.parse(result);
  console.log("Images fetched:", images.map(i => i.error ? `ERROR: ${i.error}` : "OK"));
} catch(e) {
  console.error("Image fetch error:", e.message);
  images = imageUrls.map(() => ({ base64: null, error: "fetch failed" }));
}

// Color palette - deep navy + teal + gold
const NAVY = "0D1B2A";
const TEAL = "1A7A8A";
const GOLD = "D4A017";
const WHITE = "FFFFFF";
const LIGHT = "E8F4F8";
const ACCENT = "FF6B35";
const DARK_TEAL = "0D5463";
const LIGHT_GREY = "F0F4F8";

let pres = new pptxgen();
pres.layout = "LAYOUT_16x9";
pres.title = "Floor of the Fourth Ventricle";
pres.author = "1st Year MBBS Seminar";

// ─────────────────────────────────────────────
// SLIDE 1: Title Slide
// ─────────────────────────────────────────────
let slide1 = pres.addSlide();
// Background
slide1.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 5.625, fill: { color: NAVY } });
// Decorative teal bar left
slide1.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 0.25, h: 5.625, fill: { color: TEAL } });
// Gold accent bottom bar
slide1.addShape(pres.ShapeType.rect, { x: 0, y: 4.9, w: 10, h: 0.15, fill: { color: GOLD } });
// Gold accent line top
slide1.addShape(pres.ShapeType.rect, { x: 0.25, y: 0.5, w: 9.5, h: 0.03, fill: { color: GOLD } });
// Decorative circle
slide1.addShape(pres.ShapeType.ellipse, { x: 7.5, y: -0.5, w: 3.5, h: 3.5, fill: { color: TEAL }, line: { color: TEAL } });
slide1.addShape(pres.ShapeType.ellipse, { x: 7.8, y: -0.2, w: 2.8, h: 2.8, fill: { color: NAVY }, line: { color: NAVY } });

slide1.addText("NEUROANATOMY SEMINAR", {
  x: 0.5, y: 0.8, w: 9, h: 0.4,
  fontSize: 12, color: GOLD, bold: true, charSpacing: 4, fontFace: "Calibri"
});
slide1.addText("Floor of the\nFourth Ventricle", {
  x: 0.5, y: 1.3, w: 7, h: 2.2,
  fontSize: 40, color: WHITE, bold: true, fontFace: "Calibri",
  lineSpacingMultiple: 1.2
});
slide1.addText("Rhomboid Fossa", {
  x: 0.5, y: 3.45, w: 7, h: 0.5,
  fontSize: 22, color: TEAL, italic: true, fontFace: "Calibri"
});
slide1.addShape(pres.ShapeType.rect, { x: 0.5, y: 4.0, w: 3.5, h: 0.03, fill: { color: GOLD } });
slide1.addText("1st Year MBBS | Gross Anatomy Seminar", {
  x: 0.5, y: 4.2, w: 8, h: 0.35,
  fontSize: 12, color: LIGHT, fontFace: "Calibri"
});

// ─────────────────────────────────────────────
// SLIDE 2: Learning Objectives
// ─────────────────────────────────────────────
let slide2 = pres.addSlide();
slide2.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 5.625, fill: { color: LIGHT_GREY } });
slide2.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 1.1, fill: { color: NAVY } });
slide2.addShape(pres.ShapeType.rect, { x: 0, y: 1.1, w: 10, h: 0.06, fill: { color: TEAL } });

slide2.addText("LEARNING OBJECTIVES", {
  x: 0.4, y: 0.25, w: 9.2, h: 0.65,
  fontSize: 26, color: WHITE, bold: true, fontFace: "Calibri"
});

const objectives = [
  { num: "01", text: "Define the fourth ventricle and describe its location in the brainstem" },
  { num: "02", text: "Identify all surface features of the rhomboid fossa (floor)" },
  { num: "03", text: "Explain the significance of the sulcus limitans dividing motor and sensory areas" },
  { num: "04", text: "Describe the clinically important facial colliculus and underlying structures" },
  { num: "05", text: "List the boundaries, communications, and apertures of the fourth ventricle" },
  { num: "06", text: "Correlate anatomy with clinical relevance of floor lesions" },
];

objectives.forEach((obj, i) => {
  const x = i < 3 ? 0.3 : 5.2;
  const y = 1.35 + (i % 3) * 1.27;
  slide2.addShape(pres.ShapeType.rect, { x, y, w: 4.5, h: 1.1, fill: { color: WHITE }, line: { color: TEAL, pt: 1 }, shadow: { type: "outer", blur: 4, offset: 2, angle: 45, color: "aaaaaa" } });
  slide2.addShape(pres.ShapeType.rect, { x, y, w: 0.55, h: 1.1, fill: { color: TEAL } });
  slide2.addText(obj.num, { x: x + 0.02, y: y + 0.3, w: 0.52, h: 0.5, fontSize: 18, color: WHITE, bold: true, fontFace: "Calibri", align: "center" });
  slide2.addText(obj.text, { x: x + 0.65, y: y + 0.1, w: 3.7, h: 0.9, fontSize: 11, color: NAVY, fontFace: "Calibri", valign: "middle", wrap: true });
});

// ─────────────────────────────────────────────
// SLIDE 3: Introduction - What is the Fourth Ventricle?
// ─────────────────────────────────────────────
let slide3 = pres.addSlide();
slide3.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 5.625, fill: { color: WHITE } });
slide3.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 0.9, fill: { color: NAVY } });
slide3.addShape(pres.ShapeType.rect, { x: 0, y: 0.9, w: 10, h: 0.05, fill: { color: TEAL } });
slide3.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 0.2, h: 5.625, fill: { color: TEAL } });

slide3.addText("INTRODUCTION: THE FOURTH VENTRICLE", {
  x: 0.4, y: 0.15, w: 9.2, h: 0.65,
  fontSize: 22, color: WHITE, bold: true, fontFace: "Calibri"
});

// Left content panel
slide3.addShape(pres.ShapeType.rect, { x: 0.3, y: 1.05, w: 5.4, h: 4.3, fill: { color: LIGHT_GREY }, line: { color: LIGHT_GREY } });

const introPoints = [
  { heading: "Definition", text: "A tent-shaped cavity in the posterior cranial fossa, the most caudal of the four ventricles" },
  { heading: "Location", text: "Lies between the brainstem anteriorly and the cerebellum posteriorly; spans pons and rostral medulla" },
  { heading: "Shape", text: "Diamond-shaped (rhomboid) when viewed from above; gives the floor its name - Rhomboid Fossa" },
  { heading: "Roof (Tegmen)", text: "Superior medullary velum (rostral) + inferior medullary velum + choroid plexus (caudal)" },
  { heading: "Key Fact", text: "Communicates rostrally with cerebral aqueduct (Sylvius) and caudally with subarachnoid space via foramina of Luschka and Magendie" },
];

introPoints.forEach((pt, i) => {
  const y = 1.18 + i * 0.78;
  slide3.addShape(pres.ShapeType.rect, { x: 0.35, y: y, w: 0.12, h: 0.35, fill: { color: TEAL } });
  slide3.addText(pt.heading + ": ", { x: 0.55, y: y, w: 5.1, h: 0.3, fontSize: 11, color: TEAL, bold: true, fontFace: "Calibri" });
  slide3.addText(pt.text, { x: 0.55, y: y + 0.28, w: 5.0, h: 0.42, fontSize: 10, color: NAVY, fontFace: "Calibri", wrap: true });
});

// Right: brainstem overview image or diagram
if (images[2] && !images[2].error) {
  slide3.addImage({ data: images[2].base64, x: 5.85, y: 0.95, w: 3.8, h: 4.4 });
  slide3.addText("Lateral view of brainstem\n(Neuroanatomy through Clinical Cases)", {
    x: 5.85, y: 5.3, w: 3.9, h: 0.3, fontSize: 7.5, color: "888888", italic: true, fontFace: "Calibri", align: "center"
  });
} else {
  // Fallback: draw a simple shape label
  slide3.addShape(pres.ShapeType.rect, { x: 5.85, y: 1.0, w: 3.8, h: 4.3, fill: { color: LIGHT }, line: { color: TEAL } });
  slide3.addText("Lateral View\nBrainstem", { x: 6.35, y: 2.8, w: 2.8, h: 1, fontSize: 14, color: TEAL, align: "center", fontFace: "Calibri" });
}

// ─────────────────────────────────────────────
// SLIDE 4: Boundaries & Overview (Dorsal view with labeled image)
// ─────────────────────────────────────────────
let slide4 = pres.addSlide();
slide4.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 5.625, fill: { color: NAVY } });
slide4.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 0.2, h: 5.625, fill: { color: GOLD } });
slide4.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 0.9, fill: { color: DARK_TEAL } });

slide4.addText("BOUNDARIES OF THE FOURTH VENTRICLE", {
  x: 0.4, y: 0.1, w: 9.2, h: 0.75,
  fontSize: 22, color: WHITE, bold: true, fontFace: "Calibri"
});

// Main image (dorsal view - first image)
if (images[0] && !images[0].error) {
  slide4.addImage({ data: images[0].base64, x: 0.3, y: 1.0, w: 5.2, h: 4.4 });
  slide4.addText("Dorsal view of brainstem showing floor of 4th ventricle (cerebellum removed)\n– Neuroanatomy through Clinical Cases, 3rd Ed.", {
    x: 0.3, y: 5.3, w: 5.2, h: 0.28, fontSize: 7, color: LIGHT, italic: true, fontFace: "Calibri", align: "center"
  });
}

// Right side: boundary boxes
const boundaries = [
  { label: "Rostral", val: "Junction of pons and midbrain (cerebral aqueduct opens here)" },
  { label: "Caudal", val: "Obex - narrows into central canal at caudal medulla" },
  { label: "Anterior/Floor", val: "Posterior surface of pons + rostral medulla = Rhomboid Fossa" },
  { label: "Posterior/Roof", val: "Superior medullary velum (rostral) + Inferior medullary velum + Choroid plexus (caudal)" },
  { label: "Lateral Angles", val: "Lateral recesses extend into subarachnoid space at cerebellopontine angles" },
];

boundaries.forEach((b, i) => {
  const y = 1.0 + i * 0.89;
  slide4.addShape(pres.ShapeType.rect, { x: 5.65, y: y, w: 4.1, h: 0.82, fill: { color: "122436" }, line: { color: TEAL, pt: 1 } });
  slide4.addShape(pres.ShapeType.rect, { x: 5.65, y: y, w: 1.1, h: 0.82, fill: { color: TEAL } });
  slide4.addText(b.label, { x: 5.67, y: y + 0.18, w: 1.07, h: 0.45, fontSize: 10, color: WHITE, bold: true, fontFace: "Calibri", align: "center" });
  slide4.addText(b.val, { x: 6.82, y: y + 0.07, w: 2.85, h: 0.7, fontSize: 9.5, color: LIGHT, fontFace: "Calibri", wrap: true, valign: "middle" });
});

// ─────────────────────────────────────────────
// SLIDE 5: The Rhomboid Fossa - Surface Features
// ─────────────────────────────────────────────
let slide5 = pres.addSlide();
slide5.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 5.625, fill: { color: WHITE } });
slide5.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 0.9, fill: { color: NAVY } });
slide5.addShape(pres.ShapeType.rect, { x: 0, y: 0.9, w: 10, h: 0.05, fill: { color: GOLD } });
slide5.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 0.2, h: 5.625, fill: { color: GOLD } });

slide5.addText("THE RHOMBOID FOSSA - SURFACE FEATURES", {
  x: 0.4, y: 0.12, w: 9.2, h: 0.65,
  fontSize: 22, color: WHITE, bold: true, fontFace: "Calibri"
});

// Subtitle
slide5.addText("Floor of the 4th Ventricle: Diamond-shaped surface formed by posterior pons and rostral medulla", {
  x: 0.3, y: 0.98, w: 9.4, h: 0.35,
  fontSize: 11, color: TEAL, fontFace: "Calibri", italic: true
});

// Two columns of features
const features_left = [
  { title: "Median Sulcus", desc: "Midline longitudinal groove dividing fossa into right and left halves", color: TEAL },
  { title: "Medial Eminence", desc: "Ridge on each side of median sulcus, containing important nuclei", color: TEAL },
  { title: "Facial Colliculus", desc: "Prominent bulge in pontine part - formed by CN VII fibers winding over abducens nucleus (CN VI)", color: ACCENT },
  { title: "Sulcus Limitans", desc: "Longitudinal groove lateral to medial eminence - divides motor (medial) from sensory (lateral) areas", color: GOLD },
];
const features_right = [
  { title: "Vestibular Area", desc: "Lateral to sulcus limitans in pons - overlies vestibular nuclei", color: TEAL },
  { title: "Medullary Striae", desc: "Transverse white fibers crossing floor - mark pontine-medullary junction", color: TEAL },
  { title: "Hypoglossal Trigone", desc: "In medullary part, medial - overlies hypoglossal nucleus (CN XII)", color: TEAL },
  { title: "Vagal Trigone", desc: "Lateral to hypoglossal trigone - overlies dorsal motor nucleus of vagus (CN X)", color: TEAL },
];

features_left.forEach((f, i) => {
  const y = 1.45 + i * 0.99;
  slide5.addShape(pres.ShapeType.rect, { x: 0.25, y, w: 4.5, h: 0.92, fill: { color: LIGHT_GREY }, line: { color: f.color, pt: 2 } });
  slide5.addShape(pres.ShapeType.rect, { x: 0.25, y, w: 0.18, h: 0.92, fill: { color: f.color } });
  slide5.addText(f.title, { x: 0.5, y: y + 0.05, w: 4.1, h: 0.28, fontSize: 11.5, color: NAVY, bold: true, fontFace: "Calibri" });
  slide5.addText(f.desc, { x: 0.5, y: y + 0.33, w: 4.1, h: 0.55, fontSize: 9.5, color: "444444", fontFace: "Calibri", wrap: true });
});

features_right.forEach((f, i) => {
  const y = 1.45 + i * 0.99;
  slide5.addShape(pres.ShapeType.rect, { x: 5.05, y, w: 4.5, h: 0.92, fill: { color: LIGHT_GREY }, line: { color: f.color, pt: 2 } });
  slide5.addShape(pres.ShapeType.rect, { x: 5.05, y, w: 0.18, h: 0.92, fill: { color: f.color } });
  slide5.addText(f.title, { x: 5.3, y: y + 0.05, w: 4.1, h: 0.28, fontSize: 11.5, color: NAVY, bold: true, fontFace: "Calibri" });
  slide5.addText(f.desc, { x: 5.3, y: y + 0.33, w: 4.1, h: 0.55, fontSize: 9.5, color: "444444", fontFace: "Calibri", wrap: true });
});

// Also add obex
slide5.addShape(pres.ShapeType.rect, { x: 0.25, y: 5.33, w: 9.3, h: 0.25, fill: { color: NAVY }, line: { color: NAVY } });
slide5.addText("OBEX: V-shaped notch at the caudal apex of the rhomboid fossa — marks where the 4th ventricle narrows into the central canal of the spinal cord", {
  x: 0.3, y: 5.34, w: 9.2, h: 0.22, fontSize: 9, color: WHITE, fontFace: "Calibri", align: "center"
});

// ─────────────────────────────────────────────
// SLIDE 6: Sulcus Limitans - Motor vs Sensory Division
// ─────────────────────────────────────────────
let slide6 = pres.addSlide();
slide6.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 5.625, fill: { color: "F5F0FF" } });
slide6.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 0.9, fill: { color: DARK_TEAL } });
slide6.addShape(pres.ShapeType.rect, { x: 0, y: 0.9, w: 10, h: 0.05, fill: { color: GOLD } });

slide6.addText("SULCUS LIMITANS: MOTOR vs SENSORY DIVISION", {
  x: 0.4, y: 0.12, w: 9.2, h: 0.65,
  fontSize: 22, color: WHITE, bold: true, fontFace: "Calibri"
});

// Central concept box
slide6.addShape(pres.ShapeType.rect, { x: 3.0, y: 1.0, w: 4.0, h: 0.7, fill: { color: DARK_TEAL }, line: { color: DARK_TEAL } });
slide6.addText("Sulcus Limitans", {
  x: 3.0, y: 1.0, w: 4.0, h: 0.7,
  fontSize: 18, color: WHITE, bold: true, fontFace: "Calibri", align: "center", valign: "middle"
});
slide6.addText("Longitudinal groove dividing floor into medial (motor) and lateral (sensory) zones", {
  x: 2.0, y: 1.72, w: 6.0, h: 0.45,
  fontSize: 11, color: NAVY, fontFace: "Calibri", italic: true, align: "center"
});

// Motor zone (left)
slide6.addShape(pres.ShapeType.rect, { x: 0.2, y: 2.3, w: 4.4, h: 3.1, fill: { color: "E3F2FD" }, line: { color: "1565C0", pt: 2 } });
slide6.addShape(pres.ShapeType.rect, { x: 0.2, y: 2.3, w: 4.4, h: 0.5, fill: { color: "1565C0" } });
slide6.addText("MOTOR AREA (Medial)", { x: 0.2, y: 2.3, w: 4.4, h: 0.5, fontSize: 13, color: WHITE, bold: true, fontFace: "Calibri", align: "center", valign: "middle" });

const motorNuclei = [
  "Abducens nucleus (CN VI) - eye abduction",
  "Facial motor nucleus contribution (CN VII genu)",
  "Hypoglossal nucleus (CN XII) - tongue",
  "Dorsal motor nucleus of vagus (CN X) - parasympathetics",
  "Nucleus ambiguus area contribution (CN IX, X, XI)",
  "Medial eminence overlies these motor nuclei",
];
motorNuclei.forEach((n, i) => {
  slide6.addText([
    { text: "• ", options: { color: "1565C0", bold: true } },
    { text: n, options: { color: NAVY } }
  ], { x: 0.35, y: 2.88 + i * 0.37, w: 4.1, h: 0.35, fontSize: 9.5, fontFace: "Calibri" });
});

// Sensory zone (right)
slide6.addShape(pres.ShapeType.rect, { x: 5.4, y: 2.3, w: 4.4, h: 3.1, fill: { color: "FFF8E1" }, line: { color: GOLD, pt: 2 } });
slide6.addShape(pres.ShapeType.rect, { x: 5.4, y: 2.3, w: 4.4, h: 0.5, fill: { color: GOLD } });
slide6.addText("SENSORY AREA (Lateral)", { x: 5.4, y: 2.3, w: 4.4, h: 0.5, fontSize: 13, color: WHITE, bold: true, fontFace: "Calibri", align: "center", valign: "middle" });

const sensoryNuclei = [
  "Vestibular nuclei - vestibular area (balance)",
  "Cochlear nuclei - hearing (dorsal/ventral)",
  "Nucleus tractus solitarius (taste/visceral)",
  "Trigeminal sensory nucleus (CN V)",
  "Lateral to sulcus limitans",
  "Corresponds to alar plate in embryology",
];
sensoryNuclei.forEach((n, i) => {
  slide6.addText([
    { text: "• ", options: { color: GOLD, bold: true } },
    { text: n, options: { color: NAVY } }
  ], { x: 5.55, y: 2.88 + i * 0.37, w: 4.1, h: 0.35, fontSize: 9.5, fontFace: "Calibri" });
});

// Arrow between them
slide6.addShape(pres.ShapeType.rect, { x: 4.62, y: 3.5, w: 0.75, h: 0.3, fill: { color: NAVY } });
slide6.addText("←  →", { x: 4.62, y: 3.5, w: 0.75, h: 0.3, fontSize: 12, color: WHITE, bold: true, align: "center", valign: "middle", fontFace: "Calibri" });

// ─────────────────────────────────────────────
// SLIDE 7: Facial Colliculus - IMPORTANT!
// ─────────────────────────────────────────────
let slide7 = pres.addSlide();
slide7.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 5.625, fill: { color: NAVY } });
slide7.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 0.2, h: 5.625, fill: { color: ACCENT } });
slide7.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 0.9, fill: { color: "1A0A00" } });
slide7.addShape(pres.ShapeType.rect, { x: 0, y: 0.9, w: 10, h: 0.05, fill: { color: ACCENT } });

slide7.addText("FACIAL COLLICULUS - CLINICALLY IMPORTANT", {
  x: 0.4, y: 0.12, w: 9.2, h: 0.65,
  fontSize: 22, color: WHITE, bold: true, fontFace: "Calibri"
});

// Image left
if (images[1] && !images[1].error) {
  slide7.addImage({ data: images[1].base64, x: 0.3, y: 1.0, w: 5.3, h: 4.4 });
  slide7.addText("Axial section showing facial colliculus (CN VII fibers winding over CN VI nucleus)\n– Neuroanatomy through Clinical Cases, 3rd Ed.", {
    x: 0.3, y: 5.35, w: 5.3, h: 0.25, fontSize: 7, color: LIGHT, italic: true, fontFace: "Calibri", align: "center"
  });
}

// Right info panels
const facialPts = [
  { icon: "📍", title: "Location", body: "Most prominent bump on the floor, in the pontine part of the rhomboid fossa" },
  { icon: "🏗", title: "Structure", body: "Formed by CN VII (facial nerve) fibers looping around the CN VI (abducens) nucleus" },
  { icon: "⚠️", title: "Clinical Alert", body: "A lesion at facial colliculus = ipsilateral LMN facial palsy (CN VII) + ipsilateral lateral gaze palsy (CN VI)" },
  { icon: "🔗", title: "Why Together?", body: "CN VII fascicles travel through the pons and wind over the abducens nucleus before exiting at pontomedullary junction" },
];

facialPts.forEach((pt, i) => {
  const y = 1.05 + i * 1.1;
  slide7.addShape(pres.ShapeType.rect, { x: 5.75, y, w: 4.0, h: 1.0, fill: { color: "122030" }, line: { color: i === 2 ? ACCENT : TEAL, pt: 1 } });
  slide7.addText(pt.icon + " " + pt.title, { x: 5.82, y: y + 0.05, w: 3.85, h: 0.3, fontSize: 11, color: i === 2 ? ACCENT : TEAL, bold: true, fontFace: "Calibri" });
  slide7.addText(pt.body, { x: 5.82, y: y + 0.35, w: 3.85, h: 0.58, fontSize: 9.5, color: LIGHT, fontFace: "Calibri", wrap: true });
});

// ─────────────────────────────────────────────
// SLIDE 8: Communications & Apertures
// ─────────────────────────────────────────────
let slide8 = pres.addSlide();
slide8.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 5.625, fill: { color: WHITE } });
slide8.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 10, h: 0.9, fill: { color: NAVY } });
slide8.addShape(pres.ShapeType.rect, { x: 0, y: 0.9, w: 10, h: 0.05, fill: { color: TEAL } });
slide8.addShape(pres.ShapeType.rect, { x: 0, y: 0, w: 0.2, h: 5.625, fill: { color: TEAL } });

slide8.addText("COMMUNICATIONS & APERTURES", {
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// Flowchart-style
// Top connection
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slide8.addText("↘", { x: 6.6, y: 3.2, w: 0.6, h: 0.4, fontSize: 22, color: NAVY, bold: true, fontFace: "Calibri", align: "center" });

// Three apertures
const apertures = [
  {
    title: "Foramina of Luschka", sub: "(Lateral Apertures x2)",
    pts: ["Located in lateral recesses", "Open into cerebellopontine angle", "CSF → lateral subarachnoid cisterns"],
    x: 0.25, color: TEAL
  },
  {
    title: "Foramen of Magendie", sub: "(Median Aperture x1)",
    pts: ["Located in roof over obex", "Opens into cisterna magna", "Largest of the three apertures"],
    x: 3.5, color: GOLD
  },
  {
    title: "Central Canal", sub: "(Caudal Continuation)",
    pts: ["Leads into central canal of spinal cord", "Continuation at obex", "Usually obliterated in adults"],
    x: 6.75, color: ACCENT
  }
];

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});

// ─────────────────────────────────────────────
// SLIDE 9: Area Postrema & Other Features
// ─────────────────────────────────────────────
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const otherFeatures = [
  {
    title: "Area Postrema",
    icon: "🔴",
    desc: "Paired V-shaped area near obex. A circumventricular organ - LACKS blood-brain barrier. Contains chemoreceptor trigger zone (CTZ) for vomiting. Target of anti-emetic drugs.",
    color: ACCENT
  },
  {
    title: "Medullary Striae",
    icon: "━",
    desc: "Transverse white fibers running across the floor from the median sulcus to lateral recesses. They arise from arcuate nuclei and cross to cerebellum. Mark the pontine-medullary junction.",
    color: TEAL
  },
  {
    title: "Locus Coeruleus",
    icon: "🔵",
    desc: "Bluish pigmented area visible in rostral floor (pons), lateral to sulcus limitans. Major source of norepinephrine in the brain. Important in arousal, anxiety, and sleep.",
    color: "2952A3"
  },
  {
    title: "Inferior Fovea",
    icon: "◎",
    desc: "Depression in sulcus limitans at the pontine-medullary junction. Marks the location where sulcus limitans widens. Localizing landmark on the floor.",
    color: GOLD
  },
  {
    title: "Superior Fovea",
    icon: "◎",
    desc: "Depression in sulcus limitans in pontine portion. Located below the facial colliculus. Another localizing landmark on the floor.",
    color: GOLD
  },
  {
    title: "Ala Cinerea (Vagal Trigone)",
    icon: "📐",
    desc: "Gray-winged area in medullary part overlying dorsal motor nucleus of CN X. Source of preganglionic parasympathetic fibers to thoracic and abdominal viscera.",
    color: TEAL
  }
];

const cols = [
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  { x: 3.55, items: [2, 3] },
  { x: 6.82, items: [4, 5] }
];

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// ─────────────────────────────────────────────
// SLIDE 10: Clinical Correlations
// ─────────────────────────────────────────────
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const clinicals = [
  {
    condition: "Facial Colliculus Lesion",
    features: "Ipsilateral LMN facial palsy (CN VII) + ipsilateral conjugate horizontal gaze palsy (CN VI nucleus/PPRF)",
    example: "Pontine infarct, MS plaque",
    color: ACCENT
  },
  {
    condition: "Dorsal Pons Lesion (Locked-in Syndrome)",
    features: "Bilateral ventral pontine infarct → quadriplegia + loss of horizontal eye movements; preserved vertical gaze and blinking; consciousness intact",
    example: "Basilar artery thrombosis",
    color: "CC4400"
  },
  {
    condition: "Area Postrema Lesion (NMO)",
    features: "Intractable hiccups + nausea/vomiting; pathognomonic for Neuromyelitis Optica (NMOSD) with anti-AQP4 antibodies",
    example: "NMO spectrum disorder",
    color: TEAL
  },
  {
    condition: "4th Ventricle Tumors (Medulloblastoma/Ependymoma)",
    features: "Obstructive hydrocephalus → headache, vomiting, papilledema; cerebellar ataxia; CN palsies from floor compression",
    example: "Most common posterior fossa tumor in children",
    color: GOLD
  },
  {
    condition: "Dandy-Walker Malformation",
    features: "Agenesis of cerebellar vermis, cystic dilation of 4th ventricle, enlarged posterior fossa; neonatal hydrocephalus",
    example: "Congenital malformation",
    color: "2952A3"
  }
];

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// ─────────────────────────────────────────────
// SLIDE 11: Summary Diagram
// ─────────────────────────────────────────────
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// Right side: summary bullet points
const summaryPts = [
  { head: "Floor =", body: "Rhomboid fossa (posterior pons + rostral medulla)" },
  { head: "Midline =", body: "Median sulcus → medial eminence on each side" },
  { head: "Pontine area =", body: "Facial colliculi (CN VII loop + CN VI nucleus)" },
  { head: "Key groove =", body: "Sulcus limitans (motor medial / sensory lateral)" },
  { head: "Lateral to SL =", body: "Vestibular area (pons), CN nuclei" },
  { head: "Medullary striae =", body: "Mark ponto-medullary junction" },
  { head: "Medullary area =", body: "Hypoglossal trigone (CN XII) + Vagal trigone (CN X)" },
  { head: "Area postrema =", body: "CTZ - no BBB, antiemetic target" },
  { head: "Obex =", body: "Caudal apex - entry to central canal" },
  { head: "Apertures =", body: "Magendie (1 median) + Luschka (2 lateral) → CSF drainage" },
];

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// ─────────────────────────────────────────────
// SLIDE 12: Thank You / Questions
// ─────────────────────────────────────────────
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slide12.addText([
  { text: "• Neuroanatomy through Clinical Cases, 3rd Ed. (Blumenfeld) | ", options: {} },
  { text: "• Gray's Anatomy for Students (Drake et al.) | ", options: {} },
  { text: "• Principles of Neural Science (Kandel)", options: {} }
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// ─────────────────────────────────────────────
// WRITE FILE
// ─────────────────────────────────────────────
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