from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.units import cm
from reportlab.lib.colors import HexColor, white, black
from reportlab.platypus import (
    SimpleDocTemplate, Paragraph, Spacer, Image, Table, TableStyle,
    HRFlowable, KeepTogether, PageBreak
)
from reportlab.lib.enums import TA_CENTER, TA_LEFT, TA_JUSTIFY
from reportlab.platypus import Flowable
import os

# ─── Paths ───────────────────────────────────────────────────────────────────
OUTPUT = "/home/daytona/workspace/middle-ear-pdf/Middle_Ear_Anatomy_Revision.pdf"
IMG1   = "/home/daytona/workspace/middle-ear-pdf/img1_parts.png"
IMG2   = "/home/daytona/workspace/middle-ear-pdf/img2_walls.png"

# ─── Colours ─────────────────────────────────────────────────────────────────
C_DARK_BLUE  = HexColor("#1a3a5c")
C_MID_BLUE   = HexColor("#2e6da4")
C_LIGHT_BLUE = HexColor("#d6e8f7")
C_ACCENT     = HexColor("#e8734a")
C_HIGHLIGHT  = HexColor("#fff4cc")
C_GREEN      = HexColor("#2e7d32")
C_GREEN_BG   = HexColor("#e8f5e9")
C_RED_BG     = HexColor("#fce4ec")
C_RED        = HexColor("#c62828")
C_GREY_LINE  = HexColor("#cccccc")
C_BANNER_BG  = HexColor("#1a3a5c")

# ─── Document setup ───────────────────────────────────────────────────────────
doc = SimpleDocTemplate(
    OUTPUT,
    pagesize=A4,
    leftMargin=1.8*cm, rightMargin=1.8*cm,
    topMargin=2*cm, bottomMargin=2*cm,
    title="Middle Ear Anatomy - Quick Revision",
    author="Orris Medical"
)

W, H = A4
BODY_W = W - 3.6*cm

styles = getSampleStyleSheet()

# Custom styles
def make_style(name, parent='Normal', **kwargs):
    s = ParagraphStyle(name, parent=styles[parent], **kwargs)
    return s

TITLE_S = make_style('DocTitle',
    fontSize=26, textColor=white, alignment=TA_CENTER,
    fontName='Helvetica-Bold', spaceAfter=4, leading=30)

SUBTITLE_S = make_style('DocSubtitle',
    fontSize=13, textColor=HexColor("#d6e8f7"), alignment=TA_CENTER,
    fontName='Helvetica', spaceAfter=2)

H1 = make_style('H1',
    fontSize=14, textColor=white, fontName='Helvetica-Bold',
    spaceBefore=14, spaceAfter=4, leading=18,
    backColor=C_MID_BLUE, leftIndent=-6, rightIndent=-6,
    borderPad=5)

H2 = make_style('H2',
    fontSize=12, textColor=C_DARK_BLUE, fontName='Helvetica-Bold',
    spaceBefore=10, spaceAfter=3, leading=16,
    borderPad=0)

H3 = make_style('H3',
    fontSize=10.5, textColor=C_MID_BLUE, fontName='Helvetica-Bold',
    spaceBefore=6, spaceAfter=2, leading=14)

BODY = make_style('Body',
    fontSize=9.5, textColor=HexColor("#222222"), fontName='Helvetica',
    spaceBefore=2, spaceAfter=2, leading=14, alignment=TA_JUSTIFY)

BULLET = make_style('Bullet',
    fontSize=9.5, textColor=HexColor("#222222"), fontName='Helvetica',
    spaceBefore=1, spaceAfter=1, leading=13,
    leftIndent=14, bulletIndent=4, bulletFontName='Helvetica',
    bulletFontSize=10)

CAPTION = make_style('Caption',
    fontSize=8.5, textColor=HexColor("#555555"), fontName='Helvetica-Oblique',
    alignment=TA_CENTER, spaceBefore=3, spaceAfter=6)

MEMONIC = make_style('Mnemonic',
    fontSize=10, textColor=C_GREEN, fontName='Helvetica-Bold',
    alignment=TA_CENTER, spaceBefore=4, spaceAfter=4, leading=14)

CLINICAL = make_style('Clinical',
    fontSize=9.5, textColor=C_RED, fontName='Helvetica',
    spaceBefore=1, spaceAfter=1, leading=13, leftIndent=10)

# ─── Custom Flowables ────────────────────────────────────────────────────────

class ColorBox(Flowable):
    """Coloured banner with title text."""
    def __init__(self, text, bg=C_DARK_BLUE, fg=white, height=60, font_size=22):
        super().__init__()
        self.text = text
        self.bg   = bg
        self.fg   = fg
        self._h   = height
        self._fs  = font_size

    def wrap(self, aW, aH):
        self._w = aW
        return (aW, self._h)

    def draw(self):
        c = self.canv
        c.setFillColor(self.bg)
        c.rect(0, 0, self._w, self._h, fill=1, stroke=0)
        c.setFillColor(self.fg)
        c.setFont('Helvetica-Bold', self._fs)
        c.drawCentredString(self._w / 2, self._h / 2 - self._fs / 3 + 2, self.text)


class SectionHeader(Flowable):
    def __init__(self, text, color=C_MID_BLUE, width=None):
        super().__init__()
        self.text  = text
        self.color = color
        self._req_w = width

    def wrap(self, aW, aH):
        self._w = self._req_w or aW
        return (self._w, 22)

    def draw(self):
        c = self.canv
        c.setFillColor(self.color)
        c.rect(0, 0, self._w, 20, fill=1, stroke=0)
        c.setFillColor(white)
        c.setFont('Helvetica-Bold', 11)
        c.drawString(8, 5, self.text)


class HighlightBox(Flowable):
    """Coloured info box."""
    def __init__(self, paragraphs, bg=C_HIGHLIGHT, border=C_ACCENT, pad=8):
        super().__init__()
        self.paragraphs = paragraphs
        self.bg = bg
        self.border = border
        self.pad = pad

    def wrap(self, aW, aH):
        self._w = aW
        total_h = self.pad * 2
        for p in self.paragraphs:
            w, h = p.wrap(aW - self.pad*2, aH)
            total_h += h + 3
        self._h = total_h
        return (aW, total_h)

    def draw(self):
        c = self.canv
        c.setFillColor(self.bg)
        c.setStrokeColor(self.border)
        c.setLineWidth(1.5)
        c.roundRect(0, 0, self._w, self._h, 5, fill=1, stroke=1)
        y = self._h - self.pad
        for p in self.paragraphs:
            pw, ph = p.wrap(self._w - self.pad*2, 9999)
            y -= ph
            p.drawOn(c, self.pad, y)
            y -= 3


def bp(text):
    return Paragraph(f"<bullet>&bull;</bullet> {text}", BULLET)

def bold(text, color=C_DARK_BLUE):
    return f'<font color="{color.hexval() if hasattr(color,"hexval") else color}" name="Helvetica-Bold">{text}</font>'

# ─── Build story ─────────────────────────────────────────────────────────────
story = []

# ══════════════════════════════════════════════════════════════
# COVER / TITLE BANNER
# ══════════════════════════════════════════════════════════════
story.append(ColorBox("MIDDLE EAR ANATOMY", bg=C_DARK_BLUE, fg=white, height=80, font_size=26))
story.append(Spacer(1, 0.2*cm))
story.append(ColorBox("Quick Revision Notes  |  1st Year MBBS", bg=C_MID_BLUE, fg=white, height=30, font_size=12))
story.append(Spacer(1, 0.5*cm))

# Exam focus box
ef_style = make_style('EF', fontSize=9.5, textColor=C_DARK_BLUE,
                      fontName='Helvetica', leading=14, spaceAfter=2)
story.append(HighlightBox([
    Paragraph("<b>EXAM HIGH-YIELD TOPICS:</b> Middle ear cavity (6 walls, contents) | "
              "Tympanic membrane | Ossicles | Eustachian tube | Facial nerve course | "
              "Blood &amp; nerve supply | Applied anatomy", ef_style)
], bg=C_LIGHT_BLUE, border=C_MID_BLUE))
story.append(Spacer(1, 0.3*cm))

# ══════════════════════════════════════════════════════════════
# SECTION 1 – OVERVIEW
# ══════════════════════════════════════════════════════════════
story.append(SectionHeader("1.  OVERVIEW OF THE MIDDLE EAR"))
story.append(Spacer(1, 0.2*cm))

story.append(Paragraph(
    "The <b>middle ear (tympanic cavity)</b> is an air-filled, mucous membrane-lined space "
    "within the petrous part of the temporal bone. It lies between the tympanic membrane "
    "laterally and the lateral wall of the internal ear medially.",
    BODY))

story.append(Paragraph("<b>Two parts:</b>", H3))
data = [
    [bold("Part"), bold("Location"), bold("Contents")],
    ["Tympanic cavity proper\n(Mesotympanum)", "Adjacent to tympanic\nmembrane", "Ossicles, chorda tympani"],
    ["Epitympanic recess\n(Attic / Epitympanum)", "Superior to tympanic\nmembrane", "Head of malleus, body of\nincus, aditus to mastoid"],
]
t = Table(data, colWidths=[5*cm, 5*cm, 5*cm])
t.setStyle(TableStyle([
    ('BACKGROUND', (0,0), (-1,0), C_DARK_BLUE),
    ('TEXTCOLOR',  (0,0), (-1,0), white),
    ('FONTNAME',   (0,0), (-1,0), 'Helvetica-Bold'),
    ('FONTSIZE',   (0,0), (-1,-1), 9),
    ('BACKGROUND', (0,1), (-1,1), C_LIGHT_BLUE),
    ('BACKGROUND', (0,2), (-1,2), white),
    ('GRID', (0,0), (-1,-1), 0.5, C_GREY_LINE),
    ('VALIGN', (0,0), (-1,-1), 'MIDDLE'),
    ('ROWBACKGROUNDS', (0,1), (-1,-1), [C_LIGHT_BLUE, white]),
    ('TOPPADDING', (0,0), (-1,-1), 5),
    ('BOTTOMPADDING', (0,0), (-1,-1), 5),
    ('LEFTPADDING', (0,0), (-1,-1), 6),
]))
story.append(t)
story.append(Spacer(1, 0.3*cm))

# Communications
story.append(Paragraph("<b>Communications of the middle ear:</b>", H3))
comms = [
    ("Anteriorly", "Eustachian (pharyngotympanic) tube → nasopharynx"),
    ("Posteriorly", "Aditus → mastoid antrum → mastoid air cells"),
    ("Laterally",  "Tympanic membrane → external auditory meatus"),
    ("Medially",   "Internal ear (oval window, round window)"),
]
for loc, desc in comms:
    story.append(bp(f"<b>{loc}:</b> {desc}"))
story.append(Spacer(1, 0.4*cm))

# ══════════════════════════════════════════════════════════════
# DIAGRAM 1
# ══════════════════════════════════════════════════════════════
story.append(SectionHeader("2.  LABELED DIAGRAM — Parts of the Middle Ear  (Gray's Anatomy for Students)"))
story.append(Spacer(1, 0.2*cm))
img1 = Image(IMG1, width=9*cm, height=11*cm, kind='proportional')
img1.hAlign = 'CENTER'
story.append(img1)
story.append(Paragraph(
    "Fig. 1  Coronal section showing the parts of the middle ear — external acoustic meatus, "
    "tympanic membrane, ossicular chain (malleus, incus, stapes), oval window, "
    "internal ear, epitympanic recess, and pharyngotympanic tube.",
    CAPTION))
story.append(Spacer(1, 0.3*cm))

# ══════════════════════════════════════════════════════════════
# SECTION 3 – SIX WALLS
# ══════════════════════════════════════════════════════════════
story.append(SectionHeader("3.  THE SIX WALLS OF THE TYMPANIC CAVITY"))
story.append(Spacer(1, 0.2*cm))
story.append(Paragraph(
    'Remember with: <font color="#2e6da4" name="Helvetica-Bold">T-J-M-A-L-M</font>  '
    '(Tegmental · Jugular · Membranous · Anterior (Carotid) · Labyrinthine · Mastoid)',
    BODY))

walls_data = [
    [bold("Wall"), bold("Also Called"), bold("Structure / Contents"), bold("Clinical Note")],
    ["ROOF\n(Superior)", "Tegmental wall", "Tegmen tympani — thin plate of\npetrous temporal bone;\nseparates middle ear from\nmiddle cranial fossa",
     "Infection → meningitis;\nEpidural abscess"],
    ["FLOOR\n(Inferior)", "Jugular wall", "Thin bone over internal\njugular vein bulb.\nOpening for tympanic branch\nof CN IX (Jacobson's nerve)",
     "High jugular bulb may\nbulge into middle ear"],
    ["LATERAL\nWALL", "Membranous wall", "Tympanic membrane (most);\nbony lateral wall of\nepitympanic recess superiorly",
     "Otoscopy, myringotomy"],
    ["MEDIAL\nWALL", "Labyrinthine wall", "Promontory (basal cochlear turn);\nOval window (fenestra vestibuli);\nRound window (fenestra cochleae);\nFacial canal prominence;\nLateral semicircular canal prominence;\nTympanic plexus on promontory",
     "Fenestration surgery;\nFacial nerve at risk"],
    ["ANTERIOR\nWALL", "Carotid wall", "Thin bone over internal\ncarotid artery.\nOpening: Eustachian tube (lower);\nCanal for tensor tympani (upper);\nChorda tympani exits here",
     "ICA related to ET;\nOtitis media"],
    ["POSTERIOR\nWALL", "Mastoid wall", "Aditus to mastoid antrum;\nPyramidal eminence (stapedius);\nChorda tympani enters here;\nFacial nerve descends here",
     "Mastoiditis;\nCholesteatoma"],
]
tw = Table(walls_data, colWidths=[2*cm, 2.5*cm, 6*cm, 4*cm])
tw.setStyle(TableStyle([
    ('BACKGROUND', (0,0), (-1,0), C_DARK_BLUE),
    ('TEXTCOLOR',  (0,0), (-1,0), white),
    ('FONTNAME',   (0,0), (-1,0), 'Helvetica-Bold'),
    ('FONTSIZE',   (0,0), (-1,-1), 8),
    ('GRID', (0,0), (-1,-1), 0.4, C_GREY_LINE),
    ('VALIGN', (0,0), (-1,-1), 'TOP'),
    ('ROWBACKGROUNDS', (0,1), (-1,-1), [C_LIGHT_BLUE, white]),
    ('TOPPADDING', (0,0), (-1,-1), 5),
    ('BOTTOMPADDING', (0,0), (-1,-1), 5),
    ('LEFTPADDING', (0,0), (-1,-1), 5),
    ('TEXTCOLOR', (3,1), (3,-1), C_RED),
]))
story.append(tw)
story.append(Spacer(1, 0.4*cm))

# ══════════════════════════════════════════════════════════════
# DIAGRAM 2
# ══════════════════════════════════════════════════════════════
story.append(SectionHeader("4.  LABELED DIAGRAM — Medial Wall & Contents  (Gray's Anatomy for Students)"))
story.append(Spacer(1, 0.2*cm))
img2 = Image(IMG2, width=13*cm, height=9.5*cm, kind='proportional')
img2.hAlign = 'CENTER'
story.append(img2)
story.append(Paragraph(
    "Fig. 2  Schematic 'box' showing the medial wall of the tympanic cavity: promontory, "
    "oval &amp; round windows, facial canal, tympanic plexus, chorda tympani, "
    "pyramidal eminence, tensor tympani, and pharyngotympanic tube.",
    CAPTION))
story.append(Spacer(1, 0.3*cm))

# ══════════════════════════════════════════════════════════════
# SECTION 5 – TYMPANIC MEMBRANE
# ══════════════════════════════════════════════════════════════
story.append(PageBreak())
story.append(SectionHeader("5.  TYMPANIC MEMBRANE (TM)"))
story.append(Spacer(1, 0.2*cm))

story.append(Paragraph(
    "A pearly-grey, semi-transparent, oval membrane (~10 mm × 8.5 mm). "
    "Set obliquely (55° to floor of EAM). Separates external from middle ear.",
    BODY))

story.append(Paragraph("<b>Structure — 3 Layers:</b>", H3))
layers = [
    ("Outer (lateral)", "Thin squamous epithelium (continuous with skin of EAM)"),
    ("Middle (fibrous)", "Radial + circular collagen fibres — gives TM its strength"),
    ("Inner (medial)",  "Mucous membrane (continuous with middle ear lining)"),
]
for name, desc in layers:
    story.append(bp(f"<b>{name}:</b> {desc}"))

story.append(Paragraph("<b>Parts:</b>", H3))
parts = [
    ("Pars tensa", "Lower 4/5ths; tense, supported by fibrous annulus. Shows Cone of Light (anteroinferior quadrant)."),
    ("Pars flaccida (Shrapnell's membrane)", "Upper 1/5th; flaccid, no fibrous layer; attached to notch of Rivinus. Site of attic cholesteatoma."),
    ("Umbo", "Central most depressed point; tip of handle of malleus."),
    ("Cone of Light", "Anteroinferior quadrant. Seen at 5 o'clock (right ear) / 7 o'clock (left ear). Absent in otitis media."),
]
for name, desc in parts:
    story.append(bp(f"<b>{name}:</b> {desc}"))

story.append(Paragraph("<b>Nerve supply of TM:</b>", H3))
ns_data = [
    [bold("Surface"), bold("Nerve"), bold("From")],
    ["Outer (upper)", "Auriculotemporal n.", "CN V3 (mandibular)"],
    ["Outer (lower)", "Auricular branch", "CN X (vagus) — Arnold's nerve"],
    ["Inner",         "Tympanic branch",  "CN IX (glossopharyngeal) — Jacobson's nerve"],
]
tns = Table(ns_data, colWidths=[4.5*cm, 5*cm, 5*cm])
tns.setStyle(TableStyle([
    ('BACKGROUND', (0,0), (-1,0), C_MID_BLUE),
    ('TEXTCOLOR',  (0,0), (-1,0), white),
    ('FONTNAME',   (0,0), (-1,0), 'Helvetica-Bold'),
    ('FONTSIZE',   (0,0), (-1,-1), 9),
    ('GRID', (0,0), (-1,-1), 0.4, C_GREY_LINE),
    ('ROWBACKGROUNDS', (0,1), (-1,-1), [C_LIGHT_BLUE, white]),
    ('TOPPADDING', (0,0), (-1,-1), 5),
    ('BOTTOMPADDING', (0,0), (-1,-1), 5),
    ('LEFTPADDING', (0,0), (-1,-1), 6),
]))
story.append(tns)
story.append(Spacer(1, 0.2*cm))
story.append(HighlightBox([
    Paragraph("<b>Clinical Pearl:</b> Vagal (CN X) innervation of the TM → stimulation (e.g. syringing) "
              "can cause reflex bradycardia, cough, or syncope. This is 'Arnold's ear-cough reflex'.",
              make_style('CP', fontSize=9.5, textColor=C_RED, fontName='Helvetica', leading=13))
], bg=C_RED_BG, border=C_RED))
story.append(Spacer(1, 0.4*cm))

# ══════════════════════════════════════════════════════════════
# SECTION 6 – OSSICLES
# ══════════════════════════════════════════════════════════════
story.append(SectionHeader("6.  OSSICLES — The 3 Ear Bones"))
story.append(Spacer(1, 0.2*cm))

story.append(HighlightBox([
    Paragraph("<b>Mnemonic:</b>  MIS — <b>M</b>alleus · <b>I</b>ncus · <b>S</b>tapes  (lateral → medial)",
              MEMONIC)
], bg=C_GREEN_BG, border=C_GREEN))
story.append(Spacer(1, 0.2*cm))

odata = [
    [bold("Ossicle"), bold("Parts"), bold("Attachments"), bold("Muscle"), bold("Joint")],
    ["MALLEUS\n(hammer)", "Head, neck,\nhandle (manubrium),\nlateral & anterior process",
     "Handle → TM (umbo)\nHead → body of incus",
     "Tensor tympani\n(from lesser horn\nof sphenoid)",
     "Incudomallear\n(synovial)"],
    ["INCUS\n(anvil)", "Body, short process\n(posterior), long process\n(descends medially)",
     "Body ↔ malleus head\nLenticular process ↔ stapes head",
     "None",
     "Incudostapedial\n(synovial)"],
    ["STAPES\n(stirrup)", "Head, neck, anterior\n& posterior crura, footplate",
     "Footplate → oval window\n(annular ligament)",
     "Stapedius\n(from facial n.)",
     "Oval window\n(syndesmosis)"],
]
tos = Table(odata, colWidths=[2.5*cm, 3.5*cm, 3.5*cm, 3*cm, 2*cm])
tos.setStyle(TableStyle([
    ('BACKGROUND', (0,0), (-1,0), C_DARK_BLUE),
    ('TEXTCOLOR',  (0,0), (-1,0), white),
    ('FONTNAME',   (0,0), (-1,0), 'Helvetica-Bold'),
    ('FONTSIZE',   (0,0), (-1,-1), 8),
    ('GRID', (0,0), (-1,-1), 0.4, C_GREY_LINE),
    ('ROWBACKGROUNDS', (0,1), (-1,-1), [C_LIGHT_BLUE, white]),
    ('VALIGN', (0,0), (-1,-1), 'TOP'),
    ('TOPPADDING', (0,0), (-1,-1), 5),
    ('BOTTOMPADDING', (0,0), (-1,-1), 5),
    ('LEFTPADDING', (0,0), (-1,-1), 5),
]))
story.append(tos)
story.append(Spacer(1, 0.2*cm))

story.append(Paragraph("<b>Movements:</b>", H3))
story.append(bp("TM vibrations → malleus handle → incus → stapes footplate → oval window → perilymph"))
story.append(bp("Stapes footplate (3 mm²) amplifies pressure ~17× vs. TM area (55 mm²) — hydraulic action"))
story.append(bp("Lever action of ossicular chain provides additional ~1.3× amplification"))
story.append(Spacer(1, 0.4*cm))

# ══════════════════════════════════════════════════════════════
# SECTION 7 – MUSCLES
# ══════════════════════════════════════════════════════════════
story.append(SectionHeader("7.  MUSCLES OF THE MIDDLE EAR"))
story.append(Spacer(1, 0.2*cm))

mdata = [
    [bold("Muscle"), bold("Origin"), bold("Insertion"), bold("Nerve Supply"), bold("Action"), bold("Clinical")],
    ["Tensor tympani\n(largest ME muscle)",
     "Cartilage of\nEustachian tube,\nlesser wing of\nsphenoid",
     "Handle of\nmalleus (via\ncochleariform\nprocess hook)",
     "Medial pterygoid n.\n(branch of CN V3)",
     "Pulls malleus medially;\ntenses TM;\nattenuates loud sounds",
     "Stapedius reflex\ntest — CN V3"],
    ["Stapedius\n(smallest skeletal\nmuscle in body)",
     "Pyramidal\neminence\n(posterior wall)",
     "Neck of stapes",
     "Facial nerve\n(CN VII)",
     "Pulls stapes\nposteriorly;\nstiffens ossicular\nchain; protective",
     "CN VII palsy →\nhyperacusis\n(stapedius reflex\nabsent)"],
]
tm = Table(mdata, colWidths=[2.5*cm, 2.5*cm, 2.5*cm, 2.5*cm, 3*cm, 1.5*cm])
tm.setStyle(TableStyle([
    ('BACKGROUND', (0,0), (-1,0), C_DARK_BLUE),
    ('TEXTCOLOR',  (0,0), (-1,0), white),
    ('FONTNAME',   (0,0), (-1,0), 'Helvetica-Bold'),
    ('FONTSIZE',   (0,0), (-1,-1), 8),
    ('GRID', (0,0), (-1,-1), 0.4, C_GREY_LINE),
    ('ROWBACKGROUNDS', (0,1), (-1,-1), [C_LIGHT_BLUE, white]),
    ('VALIGN', (0,0), (-1,-1), 'TOP'),
    ('TOPPADDING', (0,0), (-1,-1), 5),
    ('BOTTOMPADDING', (0,0), (-1,-1), 5),
    ('LEFTPADDING', (0,0), (-1,-1), 4),
]))
story.append(tm)
story.append(Spacer(1, 0.4*cm))

# ══════════════════════════════════════════════════════════════
# SECTION 8 – EUSTACHIAN TUBE
# ══════════════════════════════════════════════════════════════
story.append(SectionHeader("8.  EUSTACHIAN TUBE (Pharyngotympanic / Auditory Tube)"))
story.append(Spacer(1, 0.2*cm))

et_points = [
    "<b>Length:</b> ~36–40 mm (1.5 inches)",
    "<b>Direction:</b> passes anteromedially and inferiorly at ~45° from middle ear to nasopharynx",
    "<b>Two parts:</b> Bony (lateral 1/3, in petrous bone) + Fibrocartilaginous (medial 2/3, collapsed at rest)",
    "<b>Isthmus:</b> narrowest point at bony–cartilaginous junction",
    "<b>Nasopharyngeal opening:</b> at torus tubarius (visible on posterior rhinoscopy)",
    "<b>Function:</b> (1) Equalises pressure — opens during swallowing, yawning; (2) Drainage of middle ear; (3) Protection from nasopharyngeal secretions",
    "<b>Opens by:</b> Tensor veli palatini (CN V3) and Levator veli palatini (CN X) — contraction during swallowing",
]
for p in et_points:
    story.append(bp(p))

story.append(Spacer(1, 0.2*cm))
story.append(HighlightBox([
    Paragraph("<b>Why children get otitis media more often:</b> In children, the ET is shorter "
              "(~18 mm), more horizontal, and wider → easier passage of nasopharyngeal bacteria → "
              "higher incidence of acute otitis media. In adults it is longer, more oblique (45°), "
              "and the lumen is narrower.",
              make_style('ET', fontSize=9.5, textColor=C_DARK_BLUE, fontName='Helvetica', leading=13))
], bg=C_LIGHT_BLUE, border=C_MID_BLUE))
story.append(Spacer(1, 0.4*cm))

# ══════════════════════════════════════════════════════════════
# SECTION 9 – FACIAL NERVE
# ══════════════════════════════════════════════════════════════
story.append(SectionHeader("9.  FACIAL NERVE (CN VII) IN THE MIDDLE EAR"))
story.append(Spacer(1, 0.2*cm))

story.append(Paragraph(
    "The facial nerve traverses the temporal bone in the <b>facial canal (Fallopian canal)</b> and "
    "gives critical branches within or related to the middle ear. Its course has 3 segments in the temporal bone:",
    BODY))

fn_data = [
    [bold("Segment"), bold("Course"), bold("Branch given off")],
    ["Labyrinthine\n(shortest, 3–5 mm)", "Enters internal auditory meatus → above cochlea",
     "Greater superficial petrosal nerve\n(from geniculate ganglion) → lacrimal gland"],
    ["Tympanic\n(horizontal, 10–12 mm)", "Runs along medial wall of middle ear\nabove oval window; most commonly\ndehiscent here",
     "Nerve to stapedius"],
    ["Mastoid\n(vertical, 15–20 mm)", "Descends in posterior wall (mastoid);\nexits stylomastoid foramen",
     "Chorda tympani nerve\n(taste anterior 2/3 tongue;\nsubmandibular & sublingual glands)"],
]
tfn = Table(fn_data, colWidths=[3.5*cm, 7*cm, 4*cm])
tfn.setStyle(TableStyle([
    ('BACKGROUND', (0,0), (-1,0), C_DARK_BLUE),
    ('TEXTCOLOR',  (0,0), (-1,0), white),
    ('FONTNAME',   (0,0), (-1,0), 'Helvetica-Bold'),
    ('FONTSIZE',   (0,0), (-1,-1), 9),
    ('GRID', (0,0), (-1,-1), 0.4, C_GREY_LINE),
    ('ROWBACKGROUNDS', (0,1), (-1,-1), [C_LIGHT_BLUE, white]),
    ('VALIGN', (0,0), (-1,-1), 'TOP'),
    ('TOPPADDING', (0,0), (-1,-1), 5),
    ('BOTTOMPADDING', (0,0), (-1,-1), 5),
    ('LEFTPADDING', (0,0), (-1,-1), 5),
]))
story.append(tfn)
story.append(Spacer(1, 0.2*cm))

story.append(Paragraph("<b>Chorda tympani nerve — key facts:</b>", H3))
ct = [
    "Branch of CN VII from mastoid segment",
    "Enters middle ear through posterior wall → runs between pars flaccida and handle of malleus",
    "Exits through anterior wall (petrotympanic fissure / iter chordae anterius)",
    "Joins lingual nerve (CN V3) in infratemporal fossa",
    "Function: taste from anterior 2/3 tongue + secretomotor to submandibular and sublingual glands",
]
for c in ct:
    story.append(bp(c))
story.append(Spacer(1, 0.4*cm))

# ══════════════════════════════════════════════════════════════
# SECTION 10 – BLOOD SUPPLY & NERVE SUPPLY
# ══════════════════════════════════════════════════════════════
story.append(PageBreak())
story.append(SectionHeader("10.  BLOOD SUPPLY OF THE MIDDLE EAR"))
story.append(Spacer(1, 0.2*cm))

bs_data = [
    [bold("Artery"), bold("Branch of"), bold("Supply")],
    ["Anterior tympanic a.",   "Maxillary a. (from ECA)",            "TM, middle ear"],
    ["Posterior tympanic a.",  "Stylomastoid a. (from post. auricular/occipital)", "Posterior ME"],
    ["Inferior tympanic a.",   "Ascending pharyngeal a. (from ECA)", "Floor, medial wall"],
    ["Superior tympanic a.",   "Middle meningeal a. (from maxillary)", "Roof (tegmental wall)"],
    ["Caroticotympanic a.",    "Internal carotid artery",            "Anterior wall, medial wall"],
    ["Petrosal branch",        "Middle meningeal a.",                "Geniculate ganglion area"],
]
tbs = Table(bs_data, colWidths=[4.5*cm, 5.5*cm, 4.5*cm])
tbs.setStyle(TableStyle([
    ('BACKGROUND', (0,0), (-1,0), C_DARK_BLUE),
    ('TEXTCOLOR',  (0,0), (-1,0), white),
    ('FONTNAME',   (0,0), (-1,0), 'Helvetica-Bold'),
    ('FONTSIZE',   (0,0), (-1,-1), 9),
    ('GRID', (0,0), (-1,-1), 0.4, C_GREY_LINE),
    ('ROWBACKGROUNDS', (0,1), (-1,-1), [C_LIGHT_BLUE, white]),
    ('TOPPADDING', (0,0), (-1,-1), 4),
    ('BOTTOMPADDING', (0,0), (-1,-1), 4),
    ('LEFTPADDING', (0,0), (-1,-1), 6),
]))
story.append(tbs)
story.append(Spacer(1, 0.3*cm))

story.append(Paragraph("<b>Venous drainage:</b> Superior petrosal sinus, pterygoid venous plexus.", BODY))
story.append(Spacer(1, 0.3*cm))

# ══════════════════════════════════════════════════════════════
# SECTION 11 – NERVE SUPPLY / TYMPANIC PLEXUS
# ══════════════════════════════════════════════════════════════
story.append(SectionHeader("11.  NERVE SUPPLY — TYMPANIC PLEXUS"))
story.append(Spacer(1, 0.2*cm))

story.append(Paragraph(
    "The <b>tympanic plexus</b> lies on the promontory (medial wall) and is formed by:",
    BODY))
plexus = [
    "<b>Tympanic branch of CN IX (Jacobson's nerve)</b> — main contributor; enters floor via inferior tympanic canaliculus",
    "<b>Caroticotympanic nerves</b> — from sympathetic plexus on ICA (T1 preganglionic → superior cervical ganglion → postganglionic)",
]
for p in plexus:
    story.append(bp(p))
story.append(Paragraph("<b>Tympanic plexus supplies:</b> mucosa of middle ear, mastoid air cells, and Eustachian tube.", BODY))
story.append(Spacer(1, 0.15*cm))
story.append(Paragraph(
    "<b>Lesser petrosal nerve</b> — terminal branch of tympanic plexus; carries parasympathetic "
    "fibres (GVE) for parotid gland (via otic ganglion → auriculotemporal nerve → parotid).",
    BODY))
story.append(Spacer(1, 0.4*cm))

# ══════════════════════════════════════════════════════════════
# SECTION 12 – APPLIED ANATOMY
# ══════════════════════════════════════════════════════════════
story.append(SectionHeader("12.  APPLIED ANATOMY (Exam Favourite!)"))
story.append(Spacer(1, 0.2*cm))

applied = [
    ("Acute Otitis Media (AOM)",
     "ET dysfunction → bacterial colonisation (S. pneumoniae, H. influenzae). "
     "More common in children (horizontal ET). Presents with otalgia, fever, bulging red TM."),
    ("Glue Ear (Otitis Media with Effusion)",
     "Chronic ET dysfunction → non-purulent middle ear effusion → conductive hearing loss. "
     "Common in children, often needs grommets."),
    ("Cholesteatoma",
     "Abnormal keratinising squamous epithelium in middle ear. Usually starts at pars flaccida. "
     "Erodes ossicles and bone. Dangerous — can erode tegmen (meningitis), facial canal (CN VII palsy), "
     "lateral semicircular canal."),
    ("Mastoiditis",
     "Infection spreads via aditus from middle ear to mastoid antrum and air cells. "
     "Post-auricular swelling, tenderness, displaced pinna. Emergency."),
    ("Facial Nerve Palsy",
     "Herpes zoster oticus (Ramsay Hunt syndrome) — VZV reactivation at geniculate ganglion. "
     "Bell's palsy — demyelination. Surgery risk at dehiscent tympanic segment."),
    ("Otosclerosis",
     "Abnormal bone remodelling at oval window → fixation of stapes footplate → "
     "conductive hearing loss. Treated by stapedectomy/stapedotomy."),
    ("Referred Otalgia",
     "No pathology in ear but pain felt there. CN V3 (dental), CN IX (tonsil/tongue base), "
     "CN X (larynx), CN VII — all share auricular branches. "
     "Always examine throat/neck in otalgia with normal ear."),
]
for title, desc in applied:
    story.append(KeepTogether([
        Paragraph(f"<b>{title}</b>", H3),
        Paragraph(desc, BODY),
        Spacer(1, 0.1*cm),
    ]))
story.append(Spacer(1, 0.3*cm))

# ══════════════════════════════════════════════════════════════
# SECTION 13 – MNEMONICS SUMMARY
# ══════════════════════════════════════════════════════════════
story.append(SectionHeader("13.  QUICK MNEMONICS & EXAM TIPS"))
story.append(Spacer(1, 0.2*cm))

mnems = [
    ("Ossicles (lateral → medial)", "MIS — Malleus, Incus, Stapes"),
    ("Walls of middle ear", "T-J-M-A-L-M — Tegmental, Jugular, Membranous, Anterior, Labyrinthine, Mastoid"),
    ("Nerve to tensor tympani", "V3 — 'Tensor Tympani = Two / Trigeminal'"),
    ("Nerve to stapedius", "7 (VII) — 'S-Seven-tapedius'"),
    ("Chorda tympani runs between", "Pars flaccida above + handle of malleus below ('chord between strings')"),
    ("Eustachian tube opens by", "TVP — Tensor Veli Palatini (+ levator veli palatini)"),
    ("Tympanic plexus main nerve", "IX (Jacobson's nerve) — on prOmontory = prOmontory plexus"),
    ("Lesser petrosal nerve → parotid", "Otic ganglion → auriculotemporal nerve → parotid"),
]
mnem_data = [[bold("Topic"), bold("Mnemonic / Key Fact")]] + [[a, b] for a, b in mnems]
tmn = Table(mnem_data, colWidths=[5.5*cm, 9*cm])
tmn.setStyle(TableStyle([
    ('BACKGROUND', (0,0), (-1,0), C_DARK_BLUE),
    ('TEXTCOLOR',  (0,0), (-1,0), white),
    ('FONTNAME',   (0,0), (-1,0), 'Helvetica-Bold'),
    ('FONTSIZE',   (0,0), (-1,-1), 9),
    ('GRID', (0,0), (-1,-1), 0.4, C_GREY_LINE),
    ('ROWBACKGROUNDS', (0,1), (-1,-1), [C_HIGHLIGHT, white]),
    ('TOPPADDING', (0,0), (-1,-1), 5),
    ('BOTTOMPADDING', (0,0), (-1,-1), 5),
    ('LEFTPADDING', (0,0), (-1,-1), 6),
    ('VALIGN', (0,0), (-1,-1), 'TOP'),
]))
story.append(tmn)
story.append(Spacer(1, 0.5*cm))

# ══════════════════════════════════════════════════════════════
# FOOTER NOTE
# ══════════════════════════════════════════════════════════════
story.append(HRFlowable(width="100%", thickness=1, color=C_GREY_LINE))
story.append(Spacer(1, 0.15*cm))
story.append(Paragraph(
    "Sources: Gray's Anatomy for Students (10e) | Cummings Otolaryngology | "
    "Orris Medical AI. For exam use only.",
    make_style('Footer', fontSize=8, textColor=HexColor("#888888"),
               alignment=TA_CENTER, fontName='Helvetica-Oblique')))

# ─── Build ─────────────────────────────────────────────────────────────────
doc.build(story)
print(f"PDF created: {OUTPUT}")

"""
Build 3 simplified ear anatomy revision PDFs.
Clean, concise, student-friendly — one topic per page where possible.
"""
from reportlab.lib.pagesizes import A4
from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle
from reportlab.lib.units import cm
from reportlab.lib.colors import HexColor, white, black
from reportlab.platypus import (
    SimpleDocTemplate, Paragraph, Spacer, Image, Table, TableStyle,
    HRFlowable, KeepTogether, PageBreak
)
from reportlab.lib.enums import TA_CENTER, TA_LEFT, TA_JUSTIFY
from reportlab.platypus import Flowable

DIR = "/home/daytona/workspace/middle-ear-pdf/"

# ── Colours ──────────────────────────────────────────────────────────
BLUE   = HexColor("#1f4e79")
LBLUE  = HexColor("#d0e4f7")
MBLUE  = HexColor("#2e75b6")
RED    = HexColor("#c00000")
LRED   = HexColor("#fce4ec")
GREEN  = HexColor("#1e6b24")
LGREEN = HexColor("#e8f5e9")
GOLD   = HexColor("#7f6000")
LGOLD  = HexColor("#fff9c4")
GREY   = HexColor("#cccccc")
DGREY  = HexColor("#444444")

# ── Shared styles ────────────────────────────────────────────────────
def make_styles():
    s = {}
    base = getSampleStyleSheet()
    def st(name, parent='Normal', **kw):
        p = ParagraphStyle(name, parent=base[parent], **kw)
        s[name] = p
        return p

    st('body',  fontSize=9.5, leading=14, textColor=DGREY,
       spaceAfter=3, spaceBefore=2, alignment=TA_JUSTIFY)
    st('bullet', fontSize=9.5, leading=13, textColor=DGREY,
       leftIndent=14, bulletIndent=4, spaceAfter=2)
    st('h2', fontSize=12, leading=16, fontName='Helvetica-Bold',
       textColor=BLUE, spaceBefore=10, spaceAfter=3)
    st('h3', fontSize=10, leading=14, fontName='Helvetica-Bold',
       textColor=MBLUE, spaceBefore=6, spaceAfter=2)
    st('caption', fontSize=8, leading=11, textColor=HexColor("#666666"),
       alignment=TA_CENTER, spaceAfter=8, fontName='Helvetica-Oblique')
    st('mnem', fontSize=9.5, leading=13, fontName='Helvetica-Bold',
       textColor=GREEN, alignment=TA_CENTER, spaceBefore=3, spaceAfter=3)
    st('clinical', fontSize=9, leading=13, textColor=RED,
       leftIndent=8, spaceAfter=2)
    st('footer', fontSize=7.5, leading=10, textColor=HexColor("#888888"),
       alignment=TA_CENTER, fontName='Helvetica-Oblique')
    return s

S = make_styles()

# ── Helpers ──────────────────────────────────────────────────────────
def bp(txt):
    return Paragraph(f"<bullet>&bull;</bullet> {txt}", S['bullet'])

def section(title, color=BLUE):
    """Coloured section header bar."""
    class _Bar(Flowable):
        def wrap(self, aW, aH):
            self._w = aW; return (aW, 22)
        def draw(self):
            c = self.canv
            c.setFillColor(color)
            c.rect(0, 0, self._w, 20, fill=1, stroke=0)
            c.setFillColor(white)
            c.setFont('Helvetica-Bold', 10.5)
            c.drawString(7, 5, title)
    return _Bar()

def infobox(paras, bg=LBLUE, border=MBLUE):
    class _Box(Flowable):
        def wrap(self, aW, aH):
            self._w = aW
            self._h = 10
            for p in paras:
                _, ph = p.wrap(aW - 16, 9999)
                self._h += ph + 4
            return (aW, self._h)
        def draw(self):
            c = self.canv
            c.setFillColor(bg); c.setStrokeColor(border); c.setLineWidth(1.2)
            c.roundRect(0, 0, self._w, self._h, 4, fill=1, stroke=1)
            y = self._h - 7
            for p in paras:
                pw, ph = p.wrap(self._w - 16, 9999)
                y -= ph
                p.drawOn(c, 8, y)
                y -= 4
    return _Box()

def table(data, col_widths, header_color=BLUE, row_colors=(LBLUE, white)):
    t = Table(data, colWidths=col_widths)
    t.setStyle(TableStyle([
        ('BACKGROUND', (0,0), (-1,0), header_color),
        ('TEXTCOLOR',  (0,0), (-1,0), white),
        ('FONTNAME',   (0,0), (-1,0), 'Helvetica-Bold'),
        ('FONTSIZE',   (0,0), (-1,-1), 8.5),
        ('GRID',       (0,0), (-1,-1), 0.4, GREY),
        ('ROWBACKGROUNDS', (0,1), (-1,-1), list(row_colors)),
        ('VALIGN',     (0,0), (-1,-1), 'TOP'),
        ('TOPPADDING', (0,0), (-1,-1), 5),
        ('BOTTOMPADDING', (0,0), (-1,-1), 5),
        ('LEFTPADDING', (0,0), (-1,-1), 6),
        ('RIGHTPADDING', (0,0), (-1,-1), 4),
    ]))
    return t

def cover_bar(text, sub, bg=BLUE):
    class _Cover(Flowable):
        def wrap(self, aW, aH):
            self._w = aW; return (aW, 70)
        def draw(self):
            c = self.canv
            c.setFillColor(bg)
            c.rect(0, 0, self._w, 70, fill=1, stroke=0)
            c.setFillColor(white); c.setFont('Helvetica-Bold', 22)
            c.drawCentredString(self._w/2, 42, text)
            c.setFont('Helvetica', 11)
            c.drawCentredString(self._w/2, 22, sub)
    return _Cover()

def make_doc(path, title_str):
    return SimpleDocTemplate(
        path, pagesize=A4,
        leftMargin=1.8*cm, rightMargin=1.8*cm,
        topMargin=1.8*cm, bottomMargin=1.8*cm,
        title=title_str)

BODY_W = A4[0] - 3.6*cm

def footer_note():
    return [
        Spacer(1, 0.3*cm),
        HRFlowable(width="100%", thickness=0.5, color=GREY),
        Spacer(1, 0.1*cm),
        Paragraph("Source: Gray's Anatomy for Students | Orris Medical. Quick revision notes — 1st Year MBBS.", S['footer']),
    ]

# ═══════════════════════════════════════════════════════════════════
# PDF 1 — EXTERNAL EAR
# ═══════════════════════════════════════════════════════════════════
def build_external():
    story = []
    story.append(cover_bar("EXTERNAL EAR ANATOMY", "Quick Revision  |  1st Year MBBS", bg=BLUE))
    story.append(Spacer(1, 0.4*cm))

    # Overview
    story.append(section("OVERVIEW"))
    story.append(Spacer(1, 0.15*cm))
    story.append(Paragraph("The external ear has two parts: the <b>auricle (pinna)</b> and the <b>external acoustic meatus (EAM)</b>.", S['body']))
    story.append(Spacer(1, 0.3*cm))

    # Auricle diagram
    story.append(section("1.  AURICLE (PINNA)  — Labeled Diagram"))
    story.append(Spacer(1, 0.15*cm))
    img = Image(DIR+"img_auricle.png", width=7*cm, height=8*cm, kind='proportional')
    img.hAlign = 'CENTER'
    story.append(img)
    story.append(Paragraph("Fig. 1  Auricle — Gray's Anatomy for Students", S['caption']))

    story.append(Paragraph("<b>Parts of the auricle:</b>", S['h3']))
    auricle_data = [
        ["Part", "Description"],
        ["Helix",       "Large outer curved rim"],
        ["Antihelix",   "Inner curved ridge, parallel to helix; splits into 2 crura superiorly"],
        ["Concha",      "Deep central hollow; EAM opens from its depth"],
        ["Tragus",      "Projection anterior to EAM opening"],
        ["Antitragus",  "Projection opposite the tragus, above lobule"],
        ["Lobule",      "Fleshy inferior part; only part WITHOUT cartilage"],
        ["Scaphoid fossa", "Groove between helix and antihelix"],
        ["Triangular fossa", "Depression between the two crura of antihelix"],
    ]
    story.append(table(auricle_data, [3.5*cm, 10.5*cm]))
    story.append(Spacer(1, 0.3*cm))

    # Nerve supply auricle
    story.append(section("2.  NERVE SUPPLY OF AURICLE"))
    story.append(Spacer(1, 0.15*cm))
    ns_data = [
        ["Nerve", "Area Supplied"],
        ["Great auricular n. (C2,C3)", "Anterior + posterior inferior surface"],
        ["Lesser occipital n. (C2)",   "Posterosuperior surface"],
        ["Auriculotemporal n. (CN V3)", "Anterosuperior surface + tragus"],
        ["Auricular branch of vagus (CN X) — Arnold's nerve", "Posterior concha + floor of EAM"],
        ["Facial nerve (CN VII)",       "Small area near concha (motor to auricular muscles)"],
    ]
    story.append(table(ns_data, [6.5*cm, 7.5*cm]))
    story.append(Spacer(1, 0.15*cm))
    story.append(infobox([
        Paragraph("<b>Clinical:</b> Arnold's ear-cough reflex — stimulating posterior EAM (e.g. syringing) via CN X → reflex cough or bradycardia.", S['clinical'])
    ], bg=LRED, border=RED))
    story.append(Spacer(1, 0.3*cm))

    # Blood supply
    story.append(section("3.  BLOOD & LYMPH SUPPLY OF AURICLE"))
    story.append(Spacer(1, 0.15*cm))
    story.append(bp("<b>Arterial:</b> Posterior auricular a. (ECA) + anterior auricular branches of superficial temporal a. (ECA) + occipital a. branch"))
    story.append(bp("<b>Venous:</b> Superficial temporal v. + posterior auricular v. → external jugular v."))
    story.append(bp("<b>Lymph:</b> Anterior → parotid nodes; Posterior → mastoid nodes; Lobule → upper deep cervical nodes"))
    story.append(Spacer(1, 0.3*cm))

    # EAM
    story.append(section("4.  EXTERNAL ACOUSTIC MEATUS (EAM)  — Labeled Diagram"))
    story.append(Spacer(1, 0.15*cm))
    img2 = Image(DIR+"img_eam.png", width=9*cm, height=6.5*cm, kind='proportional')
    img2.hAlign = 'CENTER'
    story.append(img2)
    story.append(Paragraph("Fig. 2  EAM — cartilaginous outer 1/3, bony inner 2/3", S['caption']))

    eam_data = [
        ["Feature", "Detail"],
        ["Length",    "~2.5 cm (1 inch)"],
        ["Direction", "S-shaped curve: initially upward + forward, then backward, then forward + downward"],
        ["Outer 1/3", "Cartilaginous (fibrocartilage) — contains hair follicles, sebaceous glands, ceruminous glands"],
        ["Inner 2/3", "Bony (tympanic part of temporal bone) — thin skin, no hairs or glands"],
        ["Isthmus",   "Narrowest part at bony-cartilaginous junction"],
        ["Relations", "Parotid gland anteriorly (clinically important), temporomandibular joint anteriorly"],
    ]
    story.append(table(eam_data, [3*cm, 11*cm]))
    story.append(Spacer(1, 0.2*cm))

    story.append(Paragraph("<b>Nerve supply of EAM:</b>", S['h3']))
    eam_ns = [
        ["Surface", "Nerve"],
        ["Anterior + superior walls", "Auriculotemporal nerve (CN V3)"],
        ["Posterior + inferior walls", "Auricular branch of vagus (CN X)"],
        ["Minor contribution",        "Branch of facial nerve (CN VII)"],
    ]
    story.append(table(eam_ns, [5*cm, 9*cm]))
    story.append(Spacer(1, 0.2*cm))

    story.append(infobox([
        Paragraph("<b>Exam tip:</b> To straighten the EAM for otoscopy → pull pinna <b>upward, backward, and laterally</b> in adults. In infants → pull <b>downward and backward</b> (EAM more horizontal).", S['body'])
    ], bg=LGOLD, border=GOLD))
    story.append(Spacer(1, 0.3*cm))

    # Applied
    story.append(section("5.  APPLIED ANATOMY"))
    story.append(Spacer(1, 0.15*cm))
    applied = [
        ("<b>Otitis externa</b> (Swimmer's ear)", "Infection of EAM skin; pain worsened by pulling pinna (distinguishes from otitis media)"),
        ("<b>Furunculosis</b>", "Boil in outer 1/3 (cartilaginous part); intensely painful due to tight skin adherent to cartilage"),
        ("<b>Referred otalgia</b>", "Dental pain (CN V3), tonsil pain (CN IX), laryngeal pain (CN X) all felt in ear via shared nerve supply"),
        ("<b>Parotid tumour</b>", "Can impinge on EAM due to close relation anteriorly"),
    ]
    for t_str, d in applied:
        story.append(bp(f"{t_str} — {d}"))
    story.append(Spacer(1, 0.2*cm))

    story.append(infobox([
        Paragraph("<b>Mnemonic — EAM nerve supply:</b>  <b>V-X-VII</b>  (Anterior/Superior = V3 | Posterior/Inferior = X | Minor = VII)", S['mnem'])
    ], bg=LGREEN, border=GREEN))

    story += footer_note()
    doc = make_doc(DIR+"External_Ear_Anatomy.pdf", "External Ear Anatomy - Quick Revision")
    doc.build(story)
    print("External ear PDF done.")

# ═══════════════════════════════════════════════════════════════════
# PDF 2 — MIDDLE EAR (simplified)
# ═══════════════════════════════════════════════════════════════════
def build_middle():
    story = []
    story.append(cover_bar("MIDDLE EAR ANATOMY", "Quick Revision  |  1st Year MBBS", bg=HexColor("#1a3a5c")))
    story.append(Spacer(1, 0.4*cm))

    # Overview + diagram 1
    story.append(section("OVERVIEW & DIAGRAM", color=HexColor("#1a3a5c")))
    story.append(Spacer(1, 0.15*cm))
    story.append(Paragraph(
        "Air-filled space in petrous temporal bone. Two parts: "
        "<b>tympanic cavity proper</b> (mesotympanum) + <b>epitympanic recess</b> (attic, above TM).",
        S['body']))
    story.append(Spacer(1, 0.1*cm))
    img1 = Image(DIR+"img1_parts.png", width=7*cm, height=8.5*cm, kind='proportional')
    img1.hAlign = 'CENTER'
    story.append(img1)
    story.append(Paragraph("Fig. 1  Parts of middle ear (Gray's Anatomy for Students)", S['caption']))

    # Six walls
    story.append(section("1.  SIX WALLS  (Mnemonic: T-J-M-A-L-M)", color=HexColor("#1a3a5c")))
    story.append(Spacer(1, 0.15*cm))
    walls = [
        ["Wall (Alt. name)", "Key contents / relations", "Clinical"],
        ["ROOF — Tegmental\n(Tegmen tympani)",  "Thin bone; separates from middle cranial fossa", "Meningitis, epidural abscess"],
        ["FLOOR — Jugular\n(Jugular wall)",      "Thin bone over int. jugular vein bulb;\nopening for Jacobson's nerve (CN IX br.)", "High jugular bulb"],
        ["LATERAL — Membranous\n(Tympanic membrane)", "TM (most); bony wall of epitympanic recess superiorly", "Otoscopy, myringotomy"],
        ["MEDIAL — Labyrinthine\n(Lateral wall of inner ear)", "Promontory (basal cochlear turn);\nOval window (sup.); Round window (inf.);\nFacial canal; tympanic plexus", "Fenestration surgery;\nFacial nerve risk"],
        ["ANTERIOR — Carotid\n(Carotid wall)",  "Thin bone over ICA;\nEustachian tube opening (lower);\nCanal for tensor tympani (upper);\nChorda tympani exits", "ICA injury; otitis media"],
        ["POSTERIOR — Mastoid\n(Mastoid wall)", "Aditus → mastoid antrum;\nPyramidal eminence (stapedius);\nChorda tympani enters;\nFacial nerve descends", "Mastoiditis;\nCholesteatoma"],
    ]
    t1 = Table(walls, colWidths=[3.5*cm, 6.5*cm, 4*cm])
    t1.setStyle(TableStyle([
        ('BACKGROUND', (0,0), (-1,0), HexColor("#1a3a5c")),
        ('TEXTCOLOR',  (0,0), (-1,0), white),
        ('FONTNAME',   (0,0), (-1,0), 'Helvetica-Bold'),
        ('FONTSIZE',   (0,0), (-1,-1), 8),
        ('GRID',       (0,0), (-1,-1), 0.4, GREY),
        ('ROWBACKGROUNDS', (0,1), (-1,-1), [LBLUE, white]),
        ('VALIGN',     (0,0), (-1,-1), 'TOP'),
        ('TOPPADDING', (0,0), (-1,-1), 5),
        ('BOTTOMPADDING', (0,0), (-1,-1), 5),
        ('LEFTPADDING', (0,0), (-1,-1), 5),
        ('TEXTCOLOR', (2,1), (2,-1), RED),
    ]))
    story.append(t1)
    story.append(Spacer(1, 0.3*cm))

    # Diagram 2 medial wall
    story.append(section("2.  MEDIAL WALL DIAGRAM", color=HexColor("#1a3a5c")))
    story.append(Spacer(1, 0.15*cm))
    img2 = Image(DIR+"img2_walls.png", width=12*cm, height=8.5*cm, kind='proportional')
    img2.hAlign = 'CENTER'
    story.append(img2)
    story.append(Paragraph("Fig. 2  Medial wall of tympanic cavity showing promontory, oval/round windows, tympanic plexus, chorda tympani, facial nerve", S['caption']))
    story.append(Spacer(1, 0.3*cm))

    # Ossicles + muscles
    story.append(section("3.  OSSICLES & MUSCLES", color=HexColor("#1a3a5c")))
    story.append(Spacer(1, 0.15*cm))
    story.append(infobox([
        Paragraph("<b>Mnemonic:</b>  MIS  (lateral → medial):  Malleus  ·  Incus  ·  Stapes", S['mnem'])
    ], bg=LGREEN, border=GREEN))
    story.append(Spacer(1, 0.1*cm))
    oss = [
        ["Ossicle", "Parts", "Muscle attached", "Nerve to muscle"],
        ["Malleus (hammer)", "Handle attached to TM (umbo);\nHead, neck, ant. & lat. process", "Tensor tympani", "CN V3 (medial pterygoid n.)"],
        ["Incus (anvil)",    "Body + short process (posterior)\n+ long process + lenticular process", "None", "—"],
        ["Stapes (stirrup)", "Head, neck, 2 crura, footplate\n(footplate in oval window)", "Stapedius", "CN VII (facial n.)"],
    ]
    story.append(table(oss, [3*cm, 5*cm, 3.5*cm, 2.5*cm]))
    story.append(Spacer(1, 0.15*cm))
    story.append(infobox([
        Paragraph("<b>CN VII palsy</b> → stapedius paralysed → <b>hyperacusis</b> (sounds painfully loud). Tested by stapedius reflex on audiometry.", S['clinical'])
    ], bg=LRED, border=RED))
    story.append(Spacer(1, 0.3*cm))

    # Eustachian tube
    story.append(section("4.  EUSTACHIAN TUBE", color=HexColor("#1a3a5c")))
    story.append(Spacer(1, 0.15*cm))
    et = [
        ["Feature", "Detail"],
        ["Length",   "~36–40 mm"],
        ["Direction","Anteromedially + inferiorly at ~45°"],
        ["Parts",    "Bony (lateral 1/3, in petrous bone) + Fibrocartilaginous (medial 2/3, collapsed at rest)"],
        ["Isthmus",  "Narrowest point at bony-cartilaginous junction"],
        ["Opens by", "Tensor veli palatini (CN V3) during swallowing / yawning"],
        ["Functions","(1) Equalise pressure; (2) Drain middle ear; (3) Protect from nasopharyngeal secretions"],
    ]
    story.append(table(et, [3.5*cm, 10.5*cm]))
    story.append(Spacer(1, 0.15*cm))
    story.append(infobox([
        Paragraph("<b>Why children get AOM more:</b> ET in children is shorter (~18 mm), more horizontal, wider lumen → bacteria enter easily from nasopharynx.", S['body'])
    ], bg=LGOLD, border=GOLD))
    story.append(Spacer(1, 0.3*cm))

    # Facial nerve + applied
    story.append(section("5.  FACIAL NERVE THROUGH MIDDLE EAR", color=HexColor("#1a3a5c")))
    story.append(Spacer(1, 0.15*cm))
    fn = [
        ["Segment", "Course", "Branch in this segment"],
        ["Labyrinthine\n(3–5 mm)", "Internal acoustic meatus → above cochlea → geniculate ganglion", "Greater petrosal nerve\n(lacrimal gland)"],
        ["Tympanic\n(horizontal, ~11 mm)", "Medial wall above oval window\n(often dehiscent — most vulnerable)", "Nerve to stapedius"],
        ["Mastoid\n(vertical, ~15 mm)", "Descends in posterior wall → stylomastoid foramen", "Chorda tympani\n(taste + submandibular/sublingual glands)"],
    ]
    story.append(table(fn, [2.5*cm, 5.5*cm, 6*cm]))
    story.append(Spacer(1, 0.15*cm))
    story.append(bp("<b>Chorda tympani path:</b> From posterior wall → crosses middle ear (between pars flaccida and malleus handle) → exits anterior wall → joins lingual nerve (CN V3) in infratemporal fossa"))
    story.append(Spacer(1, 0.3*cm))

    # Applied
    story.append(section("6.  APPLIED ANATOMY", color=HexColor("#1a3a5c")))
    story.append(Spacer(1, 0.15*cm))
    app = [
        ("<b>Otitis media</b>", "ET dysfunction → bacterial infection of middle ear; bulging red TM, otalgia, conductive hearing loss"),
        ("<b>Cholesteatoma</b>", "Keratinising squamous epithelium invades middle ear (usually from pars flaccida) → erodes ossicles and bone"),
        ("<b>Otosclerosis</b>", "Abnormal bone at oval window → stapes fixation → conductive hearing loss; treated by stapedectomy"),
        ("<b>Mastoiditis</b>", "Infection spreads via aditus → post-auricular swelling, pinna displaced forward"),
        ("<b>Glue ear</b>", "Chronic ET dysfunction → mucoid effusion → conductive hearing loss in children"),
    ]
    for t_str, d in app:
        story.append(bp(f"{t_str} — {d}"))

    story += footer_note()
    doc = make_doc(DIR+"Middle_Ear_Anatomy_Simplified.pdf", "Middle Ear Anatomy - Quick Revision")
    doc.build(story)
    print("Middle ear PDF done.")

# ═══════════════════════════════════════════════════════════════════
# PDF 3 — INTERNAL EAR
# ═══════════════════════════════════════════════════════════════════
def build_internal():
    story = []
    story.append(cover_bar("INTERNAL EAR ANATOMY", "Quick Revision  |  1st Year MBBS", bg=HexColor("#1b5e20")))
    story.append(Spacer(1, 0.4*cm))

    # Overview
    story.append(section("OVERVIEW", color=HexColor("#1b5e20")))
    story.append(Spacer(1, 0.15*cm))
    story.append(Paragraph(
        "The internal ear (labyrinth) sits in the <b>petrous part of temporal bone</b>, between the middle ear "
        "laterally and the internal acoustic meatus medially. It has two components:",
        S['body']))
    ov = [
        ["Component", "Contains", "Fluid", "Function"],
        ["Bony labyrinth", "Vestibule + 3 semicircular canals + cochlea", "Perilymph\n(similar to CSF)", "Houses membranous labyrinth"],
        ["Membranous labyrinth", "Utricle + saccule + 3 semicircular ducts + cochlear duct", "Endolymph\n(high K⁺)", "Hearing + Balance"],
    ]
    story.append(table(ov, [3.5*cm, 5*cm, 3*cm, 3*cm], header_color=HexColor("#1b5e20")))
    story.append(Spacer(1, 0.3*cm))

    # Location diagram
    story.append(section("1.  LOCATION DIAGRAM", color=HexColor("#1b5e20")))
    story.append(Spacer(1, 0.15*cm))
    img1 = Image(DIR+"img_inner_loc.png", width=8*cm, height=7*cm, kind='proportional')
    img1.hAlign = 'CENTER'
    story.append(img1)
    story.append(Paragraph("Fig. 1  Internal ear in petrous temporal bone — cochlea, semicircular canals (ant./post./lateral), vestibulocochlear nerve CN VIII", S['caption']))

    # Bony labyrinth
    story.append(section("2.  BONY LABYRINTH", color=HexColor("#1b5e20")))
    story.append(Spacer(1, 0.15*cm))
    bl = [
        ["Part", "Location", "Key features"],
        ["Vestibule",     "Central part of bony labyrinth", "Contains oval window (lateral wall);\ncommunicates with cochlea (ant.) + semicircular canals (posterosuperiorly);\nvesibular aqueduct"],
        ["3 Semicircular\ncanals", "Posterosuperior to vestibule", "Anterior (superior), Posterior, Lateral;\neach forms 2/3 of a circle; one end dilated = ampulla;\nmutually perpendicular (3D)"],
        ["Cochlea",       "Anterior to vestibule", "2.5 turns around modiolus (central bony axis);\nbase faces internal acoustic meatus;\nscala vestibuli + scala tympani (meet at helicotrema at apex);\nscala media (cochlear duct) between them"],
    ]
    story.append(table(bl, [2.5*cm, 3.5*cm, 8*cm], header_color=HexColor("#1b5e20")))
    story.append(Spacer(1, 0.3*cm))

    # Cochlea diagram
    story.append(section("3.  COCHLEA DIAGRAM", color=HexColor("#1b5e20")))
    story.append(Spacer(1, 0.15*cm))
    img_coch = Image(DIR+"img_cochlea.png", width=8*cm, height=6*cm, kind='proportional')
    img_coch.hAlign = 'CENTER'
    story.append(img_coch)
    story.append(Paragraph("Fig. 2  Cochlea cross-section — modiolus, scala vestibuli, scala tympani, helicotrema (Gray's Anatomy for Students)", S['caption']))
    story.append(Spacer(1, 0.2*cm))

    story.append(Paragraph("<b>Cochlea scalae:</b>", S['h3']))
    scalae = [
        ["Scala", "Contains", "Communication"],
        ["Scala vestibuli (upper)",  "Perilymph", "Continuous with vestibule (via oval window)"],
        ["Scala media (middle)\n= cochlear duct", "Endolymph", "Part of membranous labyrinth;\ncontains organ of Corti"],
        ["Scala tympani (lower)",    "Perilymph", "Ends at round window (secondary TM)"],
    ]
    story.append(table(scalae, [3.5*cm, 3.5*cm, 7*cm], header_color=HexColor("#1b5e20")))
    story.append(Spacer(1, 0.1*cm))
    story.append(bp("Scala vestibuli and scala tympani communicate at the apex through the <b>helicotrema</b>"))
    story.append(bp("<b>Reissner's membrane</b> separates scala vestibuli from scala media"))
    story.append(bp("<b>Basilar membrane</b> separates scala media from scala tympani; bears the Organ of Corti"))
    story.append(Spacer(1, 0.3*cm))

    # Membranous labyrinth
    story.append(section("4.  MEMBRANOUS LABYRINTH & BALANCE", color=HexColor("#1b5e20")))
    story.append(Spacer(1, 0.15*cm))
    ml = [
        ["Structure", "Location", "Sensory receptor", "Detects"],
        ["Utricle",           "Vestibule (superior)", "Macula utriculi\n(otoliths)", "Linear acceleration\n(horizontal); head tilt"],
        ["Saccule",           "Vestibule (inferior)", "Macula sacculi\n(otoliths)", "Linear acceleration\n(vertical); gravity"],
        ["3 Semicircular ducts", "Within bony canals", "Crista ampullaris\n(each ampulla)", "Angular/rotational\nacceleration"],
        ["Cochlear duct\n(scala media)", "Within cochlea", "Organ of Corti\n(hair cells on basilar m.)", "Sound (hearing)"],
    ]
    story.append(table(ml, [3*cm, 3*cm, 3.5*cm, 4.5*cm], header_color=HexColor("#1b5e20")))
    story.append(Spacer(1, 0.3*cm))

    # Bony labyrinth diagram
    story.append(section("5.  BONY LABYRINTH DIAGRAM", color=HexColor("#1b5e20")))
    story.append(Spacer(1, 0.15*cm))
    img_bl = Image(DIR+"img_bony_lab.png", width=10*cm, height=7*cm, kind='proportional')
    img_bl.hAlign = 'CENTER'
    story.append(img_bl)
    story.append(Paragraph("Fig. 3  Bony labyrinth — vestibule, semicircular canals, cochlea, modiolus, spiral lamina", S['caption']))
    story.append(Spacer(1, 0.3*cm))

    # Nerve supply
    story.append(section("6.  NERVE SUPPLY — CN VIII", color=HexColor("#1b5e20")))
    story.append(Spacer(1, 0.15*cm))
    story.append(Paragraph(
        "The <b>vestibulocochlear nerve (CN VIII)</b> enters the internal acoustic meatus and divides into:",
        S['body']))
    cn8 = [
        ["Division", "Ganglion", "Supplies", "Function"],
        ["Cochlear nerve", "Spiral (cochlear) ganglion\n(in modiolus)", "Organ of Corti\n(hair cells)", "Hearing"],
        ["Vestibular nerve", "Scarpa's (vestibular) ganglion\n(in IAM)", "Maculae + cristae ampullaris", "Balance"],
    ]
    story.append(table(cn8, [3*cm, 4*cm, 4*cm, 3*cm], header_color=HexColor("#1b5e20")))
    story.append(Spacer(1, 0.2*cm))

    story.append(infobox([
        Paragraph("<b>Blood supply:</b> Labyrinthine artery (= internal auditory artery) — branch of <b>AICA</b> (anterior inferior cerebellar artery) from basilar artery. End artery — no collaterals → infarction causes sudden sensorineural deafness.", S['body'])
    ], bg=LGOLD, border=GOLD))
    story.append(Spacer(1, 0.3*cm))

    # Applied
    story.append(section("7.  APPLIED ANATOMY", color=HexColor("#1b5e20")))
    story.append(Spacer(1, 0.15*cm))
    app = [
        ("<b>Labyrinthitis</b>", "Viral infection of membranous labyrinth → vertigo + sensorineural hearing loss"),
        ("<b>Meniere's disease</b>", "Endolymphatic hydrops (excess endolymph) → episodes of vertigo + fluctuating SNHL + tinnitus + aural fullness"),
        ("<b>BPPV</b>", "Otoconia (calcium crystals) displaced into semicircular canal → positional vertigo; treated by Epley manoeuvre"),
        ("<b>Acoustic neuroma</b>", "Schwannoma of CN VIII in internal acoustic meatus → progressive SNHL + tinnitus + vertigo"),
        ("<b>Presbycusis</b>", "Age-related degeneration of basal turn of cochlea (high-frequency loss first)"),
    ]
    for t_str, d in app:
        story.append(bp(f"{t_str} — {d}"))
    story.append(Spacer(1, 0.2*cm))

    story.append(infobox([
        Paragraph("<b>Key fact:</b>  Perilymph composition ≈ extracellular fluid (high Na⁺, low K⁺).  "
                  "Endolymph composition ≈ intracellular fluid (high K⁺, low Na⁺) — unique in the body. "
                  "Endolymph produced by stria vascularis.", S['body'])
    ], bg=LGOLD, border=GOLD))

    story += footer_note()
    doc = make_doc(DIR+"Internal_Ear_Anatomy.pdf", "Internal Ear Anatomy - Quick Revision")
    doc.build(story)
    print("Internal ear PDF done.")

# ── Run all ──────────────────────────────────────────────────────────
build_external()
build_middle()
build_internal()
print("All 3 PDFs built successfully.")