import { useEffect, useRef, useState } from 'react';
import { useI18n, LANGS } from '../i18n/I18nProvider';
import { ACCENTS, FONT_SETS, useTheme, type FontSetId } from '../theme/ThemeProvider';
import { Avatar } from './Avatar';
import type { User } from '../api';

// Header: the app's TopBar minus everything camera-only, plus the two controls
// the web build adds — theme (light/dark + accent group) and language.
export function TopBar({
  recipeName,
  pro,
  user,
  exporting,
  savingPhoto,
  canUndo,
  canRedo,
  onUndo,
  onRedo,
  onReset,
  onSavePhoto,
  onExport,
  photoCount,
  photoMax,
  onAuth,
  onSignup,
  onLogout,
}: {
  recipeName: string;
  // Saving into the account's own folder is the account's own act, so the
  // button wears the same PRO marker the chips do until the address is proven.
  pro: boolean;
  user: User | null;
  exporting: boolean;
  savingPhoto: boolean;
  canUndo: boolean;
  canRedo: boolean;
  onUndo: () => void;
  onRedo: () => void;
  onReset: () => void;
  onSavePhoto: () => void;
  onExport: () => void;
  // This account's own folder: the SAVE PHOTO button states the count, and the
  // API refuses past the cap. A guest sees 0/12 and is sent to sign in. null is
  // the admin, who the API lets past the cap — the button then just counts.
  photoCount: number;
  photoMax: number | null;
  onAuth: () => void;
  onSignup: () => void;
  onLogout: () => void;
}) {
  const { t, lang, setLang } = useI18n();
  const { mode, accent, fonts, setMode, setAccent, setFonts } = useTheme();
  const [menu, setMenu] = useState<'theme' | 'lang' | 'account' | null>(null);
  const wrap = useRef<HTMLDivElement>(null);

  useEffect(() => {
    if (!menu) return;
    const away = (e: MouseEvent) => {
      if (!wrap.current?.contains(e.target as Node)) setMenu(null);
    };
    document.addEventListener('mousedown', away);
    return () => document.removeEventListener('mousedown', away);
  }, [menu]);

  return (
    <header className="header" ref={wrap}>
      <a className="brand" href="/">
        <img src="/assets/RecipesCamIcon.png" alt="" width="26" height="26" />
        <span>Recipes<em>Cam</em></span>
      </a>
      <b className="page-name">{t('nav.studio')}</b>
      <span className="recipe-name">{recipeName}</span>

      {/* Both arrows are one icon wide, so the pair reads as one control: the
          counter-clockwise arrow steps back, the clockwise one forward. They sit
          with the name they would take back — after the mark and the preset. */}
      <button
        type="button"
        className="btn ghost icon"
        data-key="undo"
        disabled={!canUndo}
        title={t('act.undo')}
        aria-label={t('act.undo')}
        onClick={onUndo}
      >
        ↺
      </button>
      <button
        type="button"
        className="btn ghost icon"
        data-key="redo"
        disabled={!canRedo}
        title={t('act.redo')}
        aria-label={t('act.redo')}
        onClick={onRedo}
      >
        ↻
      </button>
      <span className="spacer" />

      {/* The catalogue is a page of its own, open to guests as much as to
          members — it reads the visitor's own folders and never the server. */}
      <a className="btn ghost" data-key="nav-library" href="/library">{t('nav.library')}</a>
      <button type="button" className="btn ghost" onClick={onReset}>{t('act.reset')}</button>
      <button
        type="button"
        className="btn ghost"
        data-key="save-photo"
        disabled={savingPhoto || exporting}
        title={
          photoMax !== null && photoCount >= photoMax ? t('save.photoFull', { max: photoMax }) : undefined
        }
        onClick={onSavePhoto}
      >
        {savingPhoto
          ? t('photo.uploading')
          : photoMax === null
            ? t('save.photoNoMax', { n: photoCount })
            : t('save.photo', { n: photoCount, max: photoMax })}
        {!pro ? <span className="pro">PRO</span> : null}
      </button>
      <button type="button" className="btn primary" data-key="export-photo" disabled={exporting} onClick={onExport}>
        {exporting ? t('act.exporting') : t('act.export')}
      </button>

      <div className="menu-wrap">
        <button type="button" className="btn ghost" title={t('nav.theme')} onClick={() => setMenu(menu === 'theme' ? null : 'theme')}>
          ◐
        </button>
        {menu === 'theme' ? (
          <div className="popover">
            <div className="chip-row">
              <button type="button" className={`chip${mode === 'light' ? ' on' : ''}`} onClick={() => setMode('light')}>Light</button>
              <button type="button" className={`chip${mode === 'dark' ? ' on' : ''}`} onClick={() => setMode('dark')}>Dark</button>
              <button type="button" className={`chip${mode === 'auto' ? ' on' : ''}`} data-key="theme-auto" onClick={() => setMode('auto')}>Auto</button>
            </div>
            <div className="chip-row" style={{ marginTop: 8 }}>
              {ACCENTS.map((entry) => (
                <button
                  key={entry.id}
                  type="button"
                  className={`chip${accent === entry.id ? ' on' : ''}`}
                  onClick={() => setAccent(entry.id)}
                >
                  {entry.label}
                </button>
              ))}
            </div>
            {/* A dropdown keeps the group compact — the labels are long and the
                current choice is the only one that needs to be visible. */}
            <select
              className="chip font-select"
              data-key="fonts"
              title={FONT_SETS.find((f) => f.id === fonts)?.note}
              value={fonts}
              onChange={(e) => setFonts(e.target.value as FontSetId)}
            >
              {FONT_SETS.map((entry) => (
                <option key={entry.id} value={entry.id} title={entry.note}>{entry.label}</option>
              ))}
            </select>
          </div>
        ) : null}
      </div>

      <div className="menu-wrap">
        <button type="button" className="btn ghost" title={t('nav.language')} onClick={() => setMenu(menu === 'lang' ? null : 'lang')}>
          {lang.toUpperCase()}
        </button>
        {menu === 'lang' ? (
          <div className="popover">
            {LANGS.map((entry) => (
              <button
                key={entry.id}
                type="button"
                className={`chip${lang === entry.id ? ' on' : ''}`}
                onClick={() => {
                  setLang(entry.id);
                  setMenu(null);
                }}
              >
                {entry.label}
              </button>
            ))}
          </div>
        ) : null}
      </div>

      <div className="menu-wrap">
        <button
          type="button"
          className="btn ghost account-btn"
          data-key="nav-account"
          aria-expanded={menu === 'account'}
          onClick={() => setMenu(menu === 'account' ? null : 'account')}
        >
          {user ? (
            <>
              <Avatar user={user} small />
              {user.email.split('@')[0]}
            </>
          ) : (
            t('nav.guest')
          )}
        </button>
        {menu === 'account' ? (
          <div className="popover">
            {user ? (
              <>
                <p className="hint">{t('auth.loggedInAs', { email: user.email })}</p>
                {/* The account control opens the one page that account can act
                    on: moderation for an admin, its own profile for a member. */}
                {user.admin ? (
                  <a className="btn" data-key="nav-admin" href="/admin">{t('nav.admin')}</a>
                ) : (
                  <>
                    <a className="btn" data-key="nav-photos" href="/photos">{t('nav.photos')}</a>
                    <a className="btn" data-key="nav-profile" href="/profile">{t('nav.profile')}</a>
                  </>
                )}
                <button type="button" className="btn" data-key="nav-logout" onClick={onLogout}>{t('nav.logout')}</button>
              </>
            ) : (
              <>
                <button type="button" className="btn primary" data-key="nav-login" onClick={onAuth}>
                  {t('nav.login')}
                </button>
                <button type="button" className="btn" data-key="nav-signup" onClick={onSignup}>
                  {t('nav.signup')}
                </button>
              </>
            )}
          </div>
        ) : null}
      </div>
    </header>
  );
}