// Themed frame for pages outside a study project (Home, Import, Settings, Admin):
// a calm app bar (brand, three destinations, account menu) and a page heading row.
import { useEffect, useRef, useState } from 'react';
import { useApp } from '../../context/AppContext.js';
import { themeVars, READER_THEMES } from '../reader/readerThemes.js';
import { ChevronLeft, SearchIcon } from '../reader/icons.jsx';

// `short` is what a phone shows; the full label is still the button's accessible name.
const NAV = [
  { id: 'studies', label: 'Studies', short: 'Studies' },
  { id: 'reader', label: 'Read Bible', short: 'Bible' },
  { id: 'plans', label: 'Reading Plans', short: 'Plans' },
];

// Avatar button with a dropdown: who you are, the theme, Settings, Admin, Log out.
function AccountMenu() {
  const { authUser, readerTheme, setReaderTheme, setCurrentPage, logout } = useApp();
  const [open, setOpen] = useState(false);
  const ref = useRef(null);

  useEffect(() => {
    if (!open) return undefined;
    const onDown = (e) => { if (!ref.current?.contains(e.target)) setOpen(false); };
    const onKey = (e) => { if (e.key === 'Escape') setOpen(false); };
    document.addEventListener('mousedown', onDown);
    document.addEventListener('keydown', onKey);
    return () => { document.removeEventListener('mousedown', onDown); document.removeEventListener('keydown', onKey); };
  }, [open]);

  const go = (page) => { setOpen(false); setCurrentPage(page); };
  const item = 'block w-full rounded-lg px-3 py-2 text-left text-sm hover:bg-black/5';

  return (
    <div ref={ref} className="relative">
      <button type="button" onClick={() => setOpen((o) => !o)} aria-label="Account menu" aria-expanded={open}
        className="flex h-8 w-8 items-center justify-center rounded-full border border-[var(--r-line)] bg-[var(--r-bg)] text-xs font-medium uppercase hover:bg-black/5">
        {authUser?.email?.[0] ?? '·'}
      </button>
      {open && (
        <div role="menu" className="absolute right-0 top-full z-40 mt-2 w-60 rounded-2xl border border-[var(--r-line)] bg-[var(--r-bar)] p-2 shadow-xl">
          {authUser && <p className="truncate px-3 pb-1 pt-2 text-xs text-[var(--r-sub)]">{authUser.email}</p>}
          <div className="px-3 pb-2 pt-1">
            <p className="mb-1.5 text-[11px] uppercase tracking-wide text-[var(--r-sub)]">Theme</p>
            <div className="flex overflow-hidden rounded-lg border border-[var(--r-line)]">
              {Object.entries(READER_THEMES).map(([id, t]) => (
                <button key={id} type="button" onClick={() => setReaderTheme(id)} aria-pressed={readerTheme === id}
                  className={`flex-1 px-2 py-1.5 text-xs ${readerTheme === id ? 'bg-[var(--r-text)] text-[var(--r-bg)]' : 'text-[var(--r-sub)] hover:bg-black/5'}`}>{t.label}</button>
              ))}
            </div>
          </div>
          {authUser && (
            <div className="border-t border-[var(--r-line)] pt-1">
              <button type="button" role="menuitem" onClick={() => go('settings')} className={item}>Settings</button>
              {authUser.isAdmin && <button type="button" role="menuitem" onClick={() => go('admin')} className={item}>Admin</button>}
              <button type="button" role="menuitem" onClick={() => { setOpen(false); logout(); }} className={item}>Log out</button>
            </div>
          )}
        </div>
      )}
    </div>
  );
}

export default function PageShell({ title, onBack, actions, active = null, maxWidth = 'max-w-6xl', children }) {
  const { readerTheme, goHome, goStudies, openBibleReader, openReadingPlans, openPalette } = useApp();
  const go = { studies: goStudies, reader: openBibleReader, plans: openReadingPlans };
  return (
    <div className="min-h-dvh bg-[var(--r-bg)] font-sans text-[var(--r-text)]" style={themeVars(readerTheme)}>
      <a href="#content" className="skip-link">Skip to content</a>
      <header className="safe-top sticky top-0 z-30 border-b border-[var(--r-line)] bg-[var(--r-bar)]">
        <div className={`mx-auto flex h-12 ${maxWidth} items-center gap-2 px-3 sm:gap-4 sm:px-4`}>
          <button type="button" onClick={goHome} className="flex shrink-0 items-center gap-2" aria-label="Bible Study home">
            <img src="/logo.svg" alt="" className="h-6 w-6" />
            <span className="hidden text-sm font-medium sm:inline">Bible Study</span>
          </button>
          <nav aria-label="Main" className="flex items-center gap-0.5">
            {NAV.map((n) => (
              <button key={n.id} type="button" onClick={go[n.id]} aria-current={active === n.id ? 'page' : undefined} aria-label={n.label}
                className={`whitespace-nowrap rounded-full px-2.5 py-1.5 text-sm sm:px-3 ${active === n.id ? 'bg-[var(--r-text)] text-[var(--r-bg)]' : 'text-[var(--r-sub)] hover:bg-black/5'}`}>
                <span className="sm:hidden" aria-hidden="true">{n.short}</span><span className="hidden sm:inline" aria-hidden="true">{n.label}</span>
              </button>
            ))}
          </nav>
          <div className="ml-auto flex items-center gap-2">
            {openPalette && (
              <button type="button" onClick={openPalette} aria-label="Search and go to"
                className="flex items-center gap-2 rounded-full border border-[var(--r-line)] bg-[var(--r-bg)] px-3 py-1 text-xs text-[var(--r-sub)] hover:bg-black/5">
                <SearchIcon /><span className="hidden sm:inline">Search</span><kbd className="hidden rounded border border-[var(--r-line)] px-1 text-[10px] md:inline">⌘K</kbd>
              </button>
            )}
            <AccountMenu />
          </div>
        </div>
      </header>
      <div id="content" tabIndex={-1} className="focus:outline-none">
      <div className={`mx-auto flex ${maxWidth} flex-wrap items-center gap-3 px-4 pt-6`}>
        {onBack && (
          <button type="button" onClick={onBack} aria-label="Back" className="-ml-2 flex h-9 w-9 items-center justify-center rounded-lg text-[var(--r-sub)] hover:bg-black/5"><ChevronLeft /></button>
        )}
        <h1 className="text-2xl font-medium tracking-tight">{title}</h1>
        {actions && <div className="ml-auto flex flex-wrap items-center gap-2">{actions}</div>}
      </div>
      {children}
      </div>
    </div>
  );
}