Present mode: private speaker notes, audience window, presenter view

- Speaker notes are hidden on the presenting screen by default (N / "Show notes"
  turns them on for one-screen use), so a mirrored display never shows them.
- "Audience window" opens a second window for a projector (?audience=1, no sign-in)
  that shows only the point, its passage and quoted verse. Notes, minutes, the
  script and the timer are never sent to it.
- With it connected this screen becomes a presenter view: what the audience sees,
  your notes, the next point, plus Blank audience (B) and audience text size.
- Script mode sends the audience only the title.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/components/PresentMode.jsx

@@ -1,8 +1,15 @@
 // Present mode: the script or the outline full-screen in large type, with a timer. The script scrolls by
 // itself at a speed you set (a teleprompter), and the outline moves one point at a time with the minutes you
 // planned beside the clock. The screen is kept awake while it is open. Esc, or Close, leaves.
+//
+// With a projector or second screen: "Audience window" opens a second window to drag over. It shows only the point,
+// its passage and quoted verse; your speaker notes, the script, the timer and the plan stay on this screen. This
+// screen then becomes a presenter view (what the audience sees, your notes, the next point). On one screen, notes are
+// hidden unless you turn them on, so a mirrored display never shows them by accident. B blacks out the audience screen.
 import { useCallback, useEffect, useRef, useState } from 'react';
 import { formatClock, outlineSteps, paceText, pacing } from '../utils/present.js';
+import { audienceState, audienceUrl, openChannel } from '../utils/presentSync.js';
+import StepFace from './StepFace.jsx';
 
 const SIZES = [20, 24, 28, 34, 40, 48, 60, 72];
 const btn = 'rounded-lg border border-current/30 px-3 py-1.5 text-sm hover:bg-white/10 disabled:opacity-40';
@@ -16,10 +23,43 @@ export default function PresentMode({ title, subtitle = '', mode, script = '', t
   const [speed, setSpeed] = useState(30); // pixels per second
   const [index, setIndex] = useState(0);
   const scroller = useRef(null);
+  const [showNotes, setShowNotes] = useState(() => { try { return localStorage.getItem('present-notes-here') === 'on'; } catch { return false; } });
+  const [audienceOpen, setAudienceOpen] = useState(false); // an audience window is connected: this screen is the presenter's
+  const [blank, setBlank] = useState(false); // the audience screen is blacked out
+  const [audSize, setAudSize] = useState(() => { try { return Math.max(0, SIZES.indexOf(Number(localStorage.getItem('present-aud-size')) || 48)); } catch { return 5; } });
+  const [popupBlocked, setPopupBlocked] = useState(false);
+  const audienceWin = useRef(null);
+  const channel = useRef(null);
+  const latest = useRef(null);
   const steps = mode === 'outline' ? outlineSteps(tree) : [];
   const step = steps[index];
   const pace = mode === 'outline' ? pacing(steps, index, elapsed) : null;
 
+  // Two screens: keep the audience window in step with this one, answering a window that has just opened.
+  const audience = audienceState({ title, subtitle, mode, step, index, total: steps.length, dark, fontPx: SIZES[audSize], blank });
+  latest.current = audience;
+  useEffect(() => {
+    const ch = openChannel();
+    channel.current = ch;
+    if (!ch) return undefined;
+    ch.onmessage = (e) => { if (e.data?.type === 'hello') { setAudienceOpen(true); ch.postMessage(latest.current); } };
+    return () => { ch.postMessage({ type: 'end' }); ch.close(); channel.current = null; };
+  }, []);
+  useEffect(() => { channel.current?.postMessage(audience); }); // every change: the point, the colours, blank
+  useEffect(() => {
+    if (!audienceOpen) return undefined;
+    const t = window.setInterval(() => { if (audienceWin.current?.closed) { audienceWin.current = null; setAudienceOpen(false); setBlank(false); } }, 1000);
+    return () => window.clearInterval(t);
+  }, [audienceOpen]);
+  const openAudience = () => {
+    if (!channel.current) return;
+    const win = window.open(audienceUrl(), 'bible-study-audience', 'popup,width=1280,height=720');
+    setPopupBlocked(!win);
+    if (win) { audienceWin.current = win; setAudienceOpen(true); }
+  };
+  const toggleNotes = () => setShowNotes((on) => { const next = !on; try { localStorage.setItem('present-notes-here', next ? 'on' : 'off'); } catch { /* storage unavailable */ } return next; });
+  const audBigger = (d) => setAudSize((i) => { const next = Math.min(SIZES.length - 1, Math.max(0, i + d)); try { localStorage.setItem('present-aud-size', String(SIZES[next])); } catch { /* storage unavailable */ } return next; });
+
   // the clock
   useEffect(() => {
     if (!running) return undefined;
@@ -68,13 +108,20 @@ export default function PresentMode({ title, subtitle = '', mode, script = '', t
         if (e.key === 'ArrowRight' || e.key === 'ArrowDown' || e.key === ' ' || e.key === 'PageDown') { e.preventDefault(); go(1); }
         else if (e.key === 'ArrowLeft' || e.key === 'ArrowUp' || e.key === 'PageUp') { e.preventDefault(); go(-1); }
       } else if (e.key === ' ') { e.preventDefault(); setScrolling((s) => !s); }
+      if ((e.key === 'b' || e.key === 'B') && audienceOpen) setBlank((b) => !b);
+      if ((e.key === 'n' || e.key === 'N') && !audienceOpen && mode === 'outline') toggleNotes();
       if (e.key === '+' || e.key === '=') bigger(1);
       if (e.key === '-') bigger(-1);
     };
     window.addEventListener('keydown', onKey);
     return () => window.removeEventListener('keydown', onKey);
-  }, [mode, go, onClose]);
+  }, [mode, go, onClose, audienceOpen]);
 
+  const banner = audienceOpen && (
+    <p role="status" className={`shrink-0 px-4 py-1.5 text-center text-xs ${blank ? 'bg-red-500/25' : 'bg-emerald-500/15'}`}>
+      {blank ? 'The audience screen is blank. Press B to bring it back.' : mode === 'script' ? 'The audience window is connected. It shows only the title; your script stays on this screen.' : 'The audience window is connected. It shows the points and verses, never your notes.'}
+    </p>
+  );
   const colors = dark ? 'bg-[#111] text-[#f2efe8]' : 'bg-[#faf7f0] text-[#2b2620]';
   const fontSize = `${SIZES[size]}px`;
   const total = steps.length ? steps[steps.length - 1].plannedEnd : 0;
@@ -102,29 +149,73 @@ export default function PresentMode({ title, subtitle = '', mode, script = '', t
             </label>
           </div>
         )}
+        {typeof BroadcastChannel !== 'undefined' ? (
+          <div className="flex items-center gap-2" role="group" aria-label="Second screen">
+            {audienceOpen ? (
+              <>
+                <button type="button" onClick={() => setBlank((b) => !b)} aria-pressed={blank} className={btn} title="Black out the audience screen (B)">{blank ? 'Show audience' : 'Blank audience'}</button>
+                {mode === 'outline' && (
+                  <span className="flex items-center gap-1" role="group" aria-label="Audience text size">
+                    <button type="button" onClick={() => audBigger(-1)} disabled={audSize === 0} aria-label="Smaller audience text" className={btn}>Screen A−</button>
+                    <button type="button" onClick={() => audBigger(1)} disabled={audSize === SIZES.length - 1} aria-label="Larger audience text" className={btn}>A+</button>
+                  </span>
+                )}
+              </>
+            ) : (
+              <>
+                <button type="button" onClick={openAudience} className={btn} title="Opens a second window for a projector or other screen. It shows the points, never your notes.">Audience window</button>
+                {mode === 'outline' && <button type="button" onClick={toggleNotes} aria-pressed={showNotes} className={btn} title="Speaker notes stay hidden on this screen unless you turn them on (N)">{showNotes ? 'Hide notes' : 'Show notes'}</button>}
+              </>
+            )}
+          </div>
+        ) : null}
         <button type="button" onClick={onClose} className={`${btn} font-medium`}>Close</button>
       </div>
 
       {mode === 'script' ? (
+        <>
+        {banner}
         <div ref={scroller} className="min-h-0 flex-1 overflow-y-auto px-[6vw] py-[8dvh]" style={{ scrollBehavior: 'auto' }}>
           {script.trim()
             ? <div className="mx-auto max-w-[46em] whitespace-pre-wrap font-serif" style={{ fontSize, lineHeight: 1.5 }}>{script}<div style={{ height: '50dvh' }} aria-hidden="true" /></div>
             : <p className="mt-20 text-center text-lg opacity-70">There’s no script to present yet. Write one on the Script page.</p>}
         </div>
+        </>
       ) : (
         <div className="flex min-h-0 flex-1 flex-col">
-          <div className="min-h-0 flex-1 overflow-y-auto px-[6vw] py-[6dvh]">
-            {step ? (
-              <div className="mx-auto max-w-[46em] font-serif" style={{ fontSize, lineHeight: 1.4 }}>
-                <p className="font-sans text-[0.4em] uppercase tracking-[0.16em] opacity-60">{step.kind ? `${step.kind} · ` : ''}Point {index + 1} of {steps.length}{step.minutes ? ` · ${step.minutes} min` : ''}</p>
-                <h1 className="mt-2 font-semibold"><span className="mr-3 opacity-60">{step.label}</span>{step.text || '(untitled)'}</h1>
-                {step.ref && <p className="mt-2 text-[0.6em] opacity-70">{step.ref}</p>}
-                {step.scripture?.text && <blockquote className="mt-5 border-l-4 border-current/30 pl-5 text-[0.8em] italic opacity-90">“{step.scripture.text}” <span className="not-italic opacity-60">— {step.scripture.ref}</span></blockquote>}
-                {step.note && <p className="mt-5 whitespace-pre-wrap text-[0.7em] opacity-85">{step.note}</p>}
-                {step.attachments.length > 0 && <p className="mt-5 text-[0.55em] opacity-60">{step.attachments.map((a) => `${a.type === 'word' ? 'Word' : 'See'}: ${a.label}`).join('   ·   ')}</p>}
+          {popupBlocked && <p role="alert" className="shrink-0 bg-amber-500/20 px-4 py-1.5 text-center text-xs">Your browser blocked the audience window. Allow pop-ups for this site, then try again.</p>}
+          {banner}
+          {audienceOpen && step ? (
+            // Presenter view: what the audience sees, your private notes, and what comes next
+            <div className="grid min-h-0 flex-1 gap-0 md:grid-cols-[3fr_2fr]">
+              <div className="min-h-0 overflow-y-auto border-current/15 px-[3vw] py-[4dvh] md:border-r">
+                <p className="mb-3 font-sans text-[11px] uppercase tracking-[0.16em] opacity-50">The audience sees</p>
+                <StepFace step={step} index={index} total={steps.length} fontSize={`${SIZES[Math.max(0, size - 3)]}px`} minutes={step.minutes} />
               </div>
-            ) : <p className="mt-20 text-center text-lg opacity-70">There’s no outline to present yet. Build one on the Outline page.</p>}
-          </div>
+              <div className="min-h-0 overflow-y-auto px-[3vw] py-[4dvh]">
+                <p className="mb-3 font-sans text-[11px] uppercase tracking-[0.16em] text-amber-500">Only you see this</p>
+                {step.note.trim()
+                  ? <p className="whitespace-pre-wrap font-serif" style={{ fontSize, lineHeight: 1.45 }}>{step.note}</p>
+                  : <p className="font-sans text-sm opacity-50">No speaker notes for this point. Add them under the point’s “⋯” details on the Outline page.</p>}
+                {steps[index + 1] && (
+                  <div className="mt-8 border-t border-current/15 pt-4">
+                    <p className="font-sans text-[11px] uppercase tracking-[0.16em] opacity-50">Next</p>
+                    <p className="mt-1 font-serif text-xl"><span className="mr-2 opacity-60">{steps[index + 1].label}</span>{steps[index + 1].text || '(untitled)'}</p>
+                    {steps[index + 1].minutes > 0 && <p className="font-sans text-xs opacity-60">{steps[index + 1].minutes} min</p>}
+                  </div>
+                )}
+              </div>
+            </div>
+          ) : (
+            <div className="min-h-0 flex-1 overflow-y-auto px-[6vw] py-[6dvh]">
+              {step ? (
+                <>
+                  <StepFace step={step} index={index} total={steps.length} fontSize={fontSize} minutes={step.minutes} note={showNotes ? step.note : ''} />
+                  {showNotes && step.note && <p className="mx-auto mt-2 max-w-[46em] font-sans text-[11px] uppercase tracking-[0.16em] text-amber-500">Speaker notes are showing on this screen (N to hide)</p>}
+                </>
+              ) : <p className="mt-20 text-center text-lg opacity-70">There’s no outline to present yet. Build one on the Outline page.</p>}
+            </div>
+          )}
           <div className="flex shrink-0 items-center justify-between gap-3 border-t border-current/15 px-4 py-3">
             <button type="button" onClick={() => go(-1)} disabled={index === 0} className={btn}>← Back</button>
             <span className="text-xs opacity-60">{total ? `${total} min planned` : 'Set minutes on points to see your pace'} · arrows or space to move</span>