import { useEffect, useMemo, useState, type ReactNode } from 'react';
import { Flame, Gem, Heart, Wifi, WifiOff } from 'lucide-react';
import { useCompanion } from '../../api/CompanionContext.js';
import type { ScreenId } from '../../app/navigation.js';
import { BottomNav } from '../bottom-nav/BottomNav.js';

type AppShellProps = {
  activeScreen: ScreenId;
  children: ReactNode;
  onNavigate: (screen: ScreenId) => void;
};

const screenTitles: Record<ScreenId, { title: string; kicker: string }> = {
  chat: { title: 'Quest', kicker: 'Hermes training path' },
  files: { title: 'Backpack', kicker: 'Workspace loot' },
  terminal: { title: 'Power move', kicker: 'Run a command' },
  activity: { title: 'League', kicker: 'Companion stats' },
  settings: { title: 'Nest', kicker: 'Connection setup' },
};

export function AppShell({ activeScreen, children, onNavigate }: AppShellProps) {
  const { client } = useCompanion();
  const [online, setOnline] = useState(false);

  useEffect(() => {
    let cancelled = false;

    client
      .health()
      .then(() => {
        if (!cancelled) setOnline(true);
      })
      .catch(() => {
        if (!cancelled) setOnline(false);
      });

    return () => {
      cancelled = true;
    };
  }, [client]);

  const title = useMemo(() => screenTitles[activeScreen], [activeScreen]);

  return (
    <div className="phone-app">
      <div className="app-shell">
        <header className="app-header">
          <div className="avatar-badge" aria-hidden="true">⚡</div>
          <div className="app-header__copy">
            <p className="eyebrow">{title.kicker}</p>
            <h1>{title.title}</h1>
          </div>
          <div className="top-stats" aria-label="Hermes status summary">
            <span className="stat-chip stat-chip--fire"><Flame size={16} fill="currentColor" />7</span>
            <span className="stat-chip stat-chip--gem"><Gem size={16} fill="currentColor" />550</span>
            <span className="stat-chip stat-chip--heart"><Heart size={16} fill="currentColor" />3</span>
          </div>
        </header>

        <div className={`connection-banner ${online ? 'connection-banner--online' : ''}`}>
          {online ? <Wifi size={18} /> : <WifiOff size={18} />}
          <span>{online ? 'Companion online — ready for quests' : 'Companion offline — check Settings'}</span>
        </div>

        <main className="app-main">{children}</main>
        <BottomNav activeScreen={activeScreen} onNavigate={onNavigate} />
      </div>
    </div>
  );
}