import { useState, useEffect, useRef } from 'react';
import { api, S } from '../lib.js';
import { UserIcon, TrashIcon } from '../icons.jsx';
import {
  getOrCreateKeyPair,
  getPublicKeyJwk,
  getFingerprint,
  deriveSharedKey,
  encryptMsg,
  decryptMsg,
} from '../crypto.js';

// ── Emoji-Konvertierung ───────────────────────────────────────────────────────
const EMOJI_MAP = {
  ':D':'😁', ':)':'🙂', ':-)':'🙂', '(:':'🙂', ';)':'😉', ';-)':'😉',
  ':P':'😛', ':-P':'😛', ':p':'😛', ':O':'😮', ':-O':'😮', ':o':'😮',
  ':(':'😢', ':-(':'😢', ":'(":'😭', '>:(':"😠", '>:-(':"😠",
  ':*':'😘', ':-*':'😘', '<3':'❤️', '</3':'💔',
  'xD':'😆', 'XD':'😆', 'x)':"😄",
  ':/':"😕", ':-/':"😕", ':|':"😐", ':-|':"😐",
  'B)':"😎", 'B-)':"😎", '^_^':"😊", '-_-':"😑",
  'O:)':"😇", 'O:-)':"😇", '>:)':"😈",
  ':3':"🐱", ':$':"😳",
};

// Ersetze Kürzel am Ende des Textes (nach Leerzeichen oder Satzanfang)
function convertEmojis(text) {
  // Letztes "Wort" vor dem Leerzeichen/Newline prüfen
  return text.replace(/(\S+)(\s)$/, (_, word, space) => {
    return (EMOJI_MAP[word] ?? word) + space;
  });
}

// ── Emoji-Picker Daten ────────────────────────────────────────────────────────
const EMOJI_GROUPS = [
  { label:'Smileys', emojis:['😀','😁','😂','🤣','😊','😇','🙂','😉','😌','😍','🥰','😘','😎','🤩','😏','😒','😞','😢','😭','😤','😠','😡','🤬','😈','👿','💀','😱','😨','😰','😓','🤔','🤐','😶','😐','😑','😬','🙄','😴','🤧','🤒','😷','🤕'] },
  { label:'Gesten', emojis:['👍','👎','👌','✌️','🤞','🤟','🤙','👋','🤚','🖐','✋','🤜','🤛','👏','🙌','🤝','🙏','💪','🫶','❤️','🧡','💛','💚','💙','💜','🖤','💔','💯','💥','✨','🎉','🔥','⭐','🌟'] },
  { label:'Dinge',  emojis:['😂💀','🎮','🏆','🎯','🎲','🃏','🎸','🎵','🎤','📱','💻','⌨️','🖱️','📷','🎬','📺','🚀','🛸','🌍','🌈','☀️','🌙','⭐','🍕','🍔','🍟','🌮','🍩','🍺','☕','🧃'] },
];

function EmojiPicker({ onSelect, onClose }) {
  const [group, setGroup] = useState(0);
  return (
    <div style={{ position:'absolute', bottom:'100%', right:0, marginBottom:6, zIndex:100,
      background:'#1a1a1e', border:'1px solid rgba(255,255,255,0.12)', borderRadius:12,
      width:272, boxShadow:'0 8px 32px rgba(0,0,0,0.5)' }}
      onMouseDown={e => e.preventDefault()}>
      <div style={{ display:'flex', borderBottom:'1px solid rgba(255,255,255,0.07)', padding:'6px 8px', gap:4 }}>
        {EMOJI_GROUPS.map((g,i) => (
          <button key={i} onClick={() => setGroup(i)} style={{ flex:1, background: group===i ?
            'rgba(78,205,196,0.15)' : 'transparent', border:'none', borderRadius:7,
            color: group===i ? '#4ecdc4' : 'rgba(255,255,255,0.4)', cursor:'pointer',
            fontSize:9, fontFamily:'monospace', padding:'4px 2px' }}>{g.label}</button>
        ))}
      </div>
      <div style={{ display:'flex', flexWrap:'wrap', padding:8, gap:2, maxHeight:180, overflowY:'auto' }}>
        {EMOJI_GROUPS[group].emojis.filter(e => e.length <= 2 || [...e].length <= 2).concat(
          EMOJI_GROUPS[group].emojis.filter(e => [...e].length > 2)
        ).map((em,i) => (
          <button key={i} onClick={() => onSelect(em)} style={{ background:'transparent', border:'none',
            borderRadius:6, cursor:'pointer', fontSize:20, padding:'4px 5px',
            transition:'background 0.1s' }}
            onMouseEnter={e => e.target.style.background='rgba(255,255,255,0.08)'}
            onMouseLeave={e => e.target.style.background='transparent'}>
            {em}
          </button>
        ))}
      </div>
    </div>
  );
}

export default function Nachrichten({ toast, mobile, nav }) {
  const [kp,          setKp]          = useState(null);
  const [initError,   setInitError]   = useState(false);
  const [users,       setUsers]       = useState([]);
  const [activeUser,  setActiveUser]  = useState(null);
  const [messages,    setMessages]    = useState([]);
  const [sharedKey,   setSharedKey]   = useState(null);   // null | CryptoKey | 'error'
  const [decrypted,   setDecrypted]   = useState({});
  const [partnerFp,   setPartnerFp]   = useState('');
  const [text,        setText]        = useState('');
  const [sending,     setSending]     = useState(false);
  const [showPicker,  setShowPicker]  = useState(false);
  const [mirc,        setMirc]        = useState(false);
  // Preference vom Server laden
  useEffect(() => {
    api('/auth/preferences').then(p => { if (p.chat_design === 'mirc') setMirc(true); }).catch(()=>{});
  }, []);
  const toggleDesign = () => setMirc(v => {
    const next = !v;
    api('/auth/preferences', { method:'PUT', body:{ chat_design: next ? 'mirc' : 'modern' } }).catch(()=>{});
    return next;
  });
  const bottomRef = useRef(null);
  const pollRef   = useRef(null);
  const pickerRef = useRef(null);
  const heartbeatRef = useRef(null);

  // Presence Heartbeat: solange Nachrichten offen + Tab sichtbar → aktiv
  useEffect(() => {
    const sendPresence = (active) => api('/tools/nachrichten/presence', { method:'POST', body:{ active } }).catch(()=>{});

    const start = () => {
      if (document.visibilityState === 'visible') {
        sendPresence(true);
        heartbeatRef.current = setInterval(() => {
          if (document.visibilityState === 'visible') sendPresence(true);
        }, 30000);
      }
    };

    const onVisibility = () => {
      if (document.visibilityState === 'visible') {
        sendPresence(true);
        if (!heartbeatRef.current) heartbeatRef.current = setInterval(() => sendPresence(true), 30000);
      } else {
        sendPresence(false);
        clearInterval(heartbeatRef.current);
        heartbeatRef.current = null;
      }
    };

    start();
    document.addEventListener('visibilitychange', onVisibility);
    return () => {
      sendPresence(false);
      clearInterval(heartbeatRef.current);
      document.removeEventListener('visibilitychange', onVisibility);
    };
  }, []);

  useEffect(() => {
    if (!showPicker) return;
    const handler = e => {
      if (pickerRef.current && !pickerRef.current.contains(e.target)) setShowPicker(false);
    };
    document.addEventListener('mousedown', handler);
    document.addEventListener('touchstart', handler);
    return () => { document.removeEventListener('mousedown', handler); document.removeEventListener('touchstart', handler); };
  }, [showPicker]);

  // ── Initialisierung ──────────────────────────────────────────────────────────
  useEffect(() => {
    getOrCreateKeyPair()
      .then(async k => {
        setKp(k);
        try {
          const jwk = await getPublicKeyJwk(k);
          await api('/tools/nachrichten/keys', { body: { public_key: JSON.stringify(jwk) } });
        } catch {}
        loadUsers();
      })
      .catch(() => setInitError(true));
  }, []);

  // ── Polling ──────────────────────────────────────────────────────────────────
  useEffect(() => {
    clearInterval(pollRef.current);
    if (!activeUser) return;
    loadMessages(activeUser.id);
    pollRef.current = setInterval(() => loadMessages(activeUser.id), 10_000);
    return () => clearInterval(pollRef.current);
  }, [activeUser?.id]);

  // ── Shared Key + Partner-Fingerprint ─────────────────────────────────────────
  useEffect(() => {
    setSharedKey(null);
    setDecrypted({});
    setPartnerFp('');
    if (!kp || !activeUser?.public_key) return;
    try {
      const pubJwk = JSON.parse(activeUser.public_key);
      deriveSharedKey(kp.privateKey, pubJwk)
        .then(setSharedKey)
        .catch(() => setSharedKey('error'));
      // Fingerprint des Partner-Keys berechnen (aus dem auf dem Server gespeicherten Public Key)
      crypto.subtle.importKey('jwk', pubJwk, { name:'X25519' }, true, [])
        .then(k => getFingerprint({ publicKey: k }))
        .then(setPartnerFp)
        .catch(() => setPartnerFp('?'));
    } catch {
      setSharedKey('error');
    }
  }, [activeUser?.id, kp]);

  // ── Entschlüsseln ────────────────────────────────────────────────────────────
  useEffect(() => {
    if (sharedKey === null || sharedKey === 'error' || !messages.length) {
      setDecrypted({});
      return;
    }
    let cancelled = false;
    (async () => {
      const result = {};
      for (const m of messages) {
        if (cancelled) return;
        try {
          result[m.id] = await decryptMsg(sharedKey, m.encrypted_content, m.iv);
        } catch {
          result[m.id] = null; // null = nicht entschlüsselbar
        }
      }
      if (!cancelled) setDecrypted(result);
    })();
    return () => { cancelled = true; };
  }, [messages, sharedKey]);

  // ── Scroll to bottom ─────────────────────────────────────────────────────────
  const prevLengthRef = useRef(0);
  useEffect(() => {
    const isFirstLoad = prevLengthRef.current === 0 && messages.length > 0;
    prevLengthRef.current = messages.length;
    if (!bottomRef.current) return;
    bottomRef.current.scrollIntoView({ behavior: isFirstLoad ? 'instant' : 'smooth' });
  }, [messages.length]);

  // ── Handlers ─────────────────────────────────────────────────────────────────
  const loadUsers = async () => {
    try { const u = await api('/tools/nachrichten/users'); setUsers(u);
      // Nav aus Suche: direkt zu User springen
      if (nav?.userId) {
        const target = u.find(x => x.id === nav.userId);
        if (target) setActiveUser(target);
      }
    } catch {}
  };

  const loadMessages = async userId => {
    try {
      setMessages(await api(`/tools/nachrichten/messages/${userId}`));
      await loadUsers();
    } catch {}
  };

  const selectUser = u => {
    setActiveUser(u);
    setMessages([]);
    setDecrypted({});
    prevLengthRef.current = 0;
  };

  const send = async (overrideText) => {
    const msg = (overrideText ?? text).trim();
    if (!msg || !kp || !activeUser) return;
    if (!activeUser.public_key) { toast('Empfänger hat noch keinen Schlüssel', 'error'); return; }
    if (sharedKey === 'error')  { toast('Schlüssel inkompatibel – Empfänger muss Schlüssel neu generieren', 'error'); return; }
    if (!sharedKey)             { toast('Schlüssel wird vorbereitet…', 'error'); return; }
    setSending(true);
    try {
      const { encrypted_content, iv } = await encryptMsg(sharedKey, msg);
      await api(`/tools/nachrichten/messages/${activeUser.id}`, { body: { encrypted_content, iv } });
      setText('');
      await loadMessages(activeUser.id);
    } catch(e) { toast(e.message, 'error'); }
    setSending(false);
  };

  const deleteMsg = async id => {
    try {
      await api(`/tools/nachrichten/messages/${id}`, { method:'DELETE' });
      setMessages(p => p.filter(m => m.id !== id));
    } catch(e) { toast(e.message, 'error'); }
  };

  const deleteConversation = async () => {
    if (!window.confirm(`Gesamten Verlauf mit ${activeUser.username} löschen?`)) return;
    try {
      await api(`/tools/nachrichten/conversation/${activeUser.id}`, { method:'DELETE' });
      setMessages([]);
      await loadUsers();
    } catch(e) { toast(e.message, 'error'); }
  };

  // ── Layout ───────────────────────────────────────────────────────────────────
  const showList = !mobile || !activeUser;
  const showChat = !mobile || !!activeUser;

  if (initError) return (
    <div style={{ padding:32, color:'rgba(255,255,255,0.45)', fontFamily:'monospace', fontSize:12, lineHeight:2 }}>
      ⚠ Verschlüsselung konnte nicht initialisiert werden.<br/>
      Dein Browser unterstützt X25519 möglicherweise nicht (erfordert Chrome 113+/Firefox 130+/Safari 17.4+).
    </div>
  );

  const mobileStyle = mobile ? {
    position: 'fixed',
    top: 0,
    left: 0,
    right: 0,
    bottom: 'calc(56px + env(safe-area-inset-bottom, 0px))',
    zIndex: 10,
  } : {
    height: '100vh',
  };

  return (
    <div style={{ display:'flex', overflow:'hidden', background:'#111114', ...mobileStyle }}>

      {/* ── Konversationsliste ─────────────────────────────────────────── */}
      {showList && (
        <div style={{
          width: mobile ? '100%' : 230,
          borderRight: mobile ? 'none' : '1px solid rgba(255,255,255,0.06)',
          display:'flex', flexDirection:'column', background:'#0d0d0f', flexShrink:0,
        }}>
          <div style={{ padding:'16px 14px 12px', borderBottom:'1px solid rgba(255,255,255,0.06)',
            display:'flex', alignItems:'center', justifyContent:'space-between' }}>
            <div style={{ ...S.head, marginBottom:0 }}>NACHRICHTEN</div>
            <div style={{ display:'flex', gap:5 }}>
              <button onClick={toggleDesign} title={mirc ? 'Zu Modern wechseln' : 'Zu mIRC wechseln'}
                style={{ background: 'rgba(255,255,255,0.05)',
                  border:'1px solid rgba(255,255,255,0.1)',
                  borderRadius:7, color:'rgba(255,255,255,0.55)',
                  cursor:'pointer', padding:'3px 8px', fontSize:10, fontFamily:'monospace', lineHeight:1 }}>
                {mirc ? '◈ mIRC' : '◈ Modern'}
              </button>
              <button onClick={() => { loadUsers(); if (activeUser) loadMessages(activeUser.id); }} title="Neu laden"
                style={{ background:'transparent', border:'1px solid rgba(255,255,255,0.1)', borderRadius:7,
                  color:'rgba(255,255,255,0.35)', cursor:'pointer', padding:'3px 8px',
                  fontSize:13, fontFamily:'monospace', lineHeight:1 }}>↺</button>
            </div>
          </div>
          <div style={{ flex:1, overflowY:'auto' }}>
            {users.length === 0 ? (
              <div style={{ color:'rgba(255,255,255,0.28)', fontSize:11, fontFamily:'monospace',
                padding:18, textAlign:'center', lineHeight:1.8 }}>
                Keine anderen Benutzer vorhanden
              </div>
            ) : users.map(u => (
              <button key={u.id} onClick={() => selectUser(u)} style={{
                width:'100%', padding:'11px 14px', border:'none', textAlign:'left', cursor:'pointer',
                background: activeUser?.id === u.id ? 'rgba(78,205,196,0.07)' : 'transparent',
                borderLeft: `2px solid ${activeUser?.id === u.id ? '#4ecdc4' : 'transparent'}`,
                display:'flex', alignItems:'center', gap:10,
              }}>
                <div style={{ width:32, height:32, borderRadius:'50%', flexShrink:0,
                  background:'linear-gradient(135deg,rgba(255,107,157,0.2),rgba(78,205,196,0.2))',
                  border:'1px solid rgba(255,255,255,0.07)',
                  display:'flex', alignItems:'center', justifyContent:'center' }}>
                  <UserIcon size={14} color="rgba(255,255,255,0.5)"/>
                </div>
                <div style={{ flex:1, minWidth:0 }}>
                  <div style={{
                    color: u.unread > 0 ? '#fff' : 'rgba(255,255,255,0.65)',
                    fontWeight: u.unread > 0 ? 700 : 400,
                    fontSize:12, fontFamily:'monospace',
                    whiteSpace:'nowrap', overflow:'hidden', textOverflow:'ellipsis',
                  }}>{u.username}</div>
                  {u.last_message_at && (
                    <div style={{ color:'rgba(255,255,255,0.26)', fontSize:9, fontFamily:'monospace', marginTop:2 }}>
                      {new Date(u.last_message_at).toLocaleDateString('de-DE',
                        { day:'numeric', month:'short', hour:'2-digit', minute:'2-digit' })}
                    </div>
                  )}
                </div>
                {u.unread > 0 && (
                  <span style={{ background:'#4ecdc4', color:'#000', borderRadius:10,
                    fontSize:9, fontFamily:'monospace', padding:'2px 7px', fontWeight:700, flexShrink:0 }}>
                    {u.unread}
                  </span>
                )}
              </button>
            ))}
          </div>
        </div>
      )}

      {/* ── Chat ──────────────────────────────────────────────────────── */}
      {showChat && (
        <div style={{ flex:1, display:'flex', flexDirection:'column', overflow:'hidden', minWidth:0 }}>
          {!activeUser ? (
            <div style={{ flex:1, display:'flex', alignItems:'center', justifyContent:'center',
              flexDirection:'column', gap:10 }}>
              <div style={{ fontSize:38, opacity:0.1 }}>✉</div>
              <div style={{ color:'rgba(255,255,255,0.18)', fontFamily:'monospace', fontSize:11 }}>
                Benutzer auswählen
              </div>
            </div>
          ) : (
            <>
              {/* Header */}
              <div style={{ padding:'10px 14px', borderBottom:'1px solid rgba(255,255,255,0.06)',
                display:'flex', alignItems:'center', gap:10, background:'#0d0d0f', flexShrink:0 }}>
                {mobile && (
                  <button onClick={() => setActiveUser(null)} style={{ background:'transparent', border:'none',
                    cursor:'pointer', color:'#4ecdc4', fontFamily:'monospace', fontSize:20, padding:'0 4px', lineHeight:1 }}>
                    ‹
                  </button>
                )}
                <div style={{ width:28, height:28, borderRadius:'50%', flexShrink:0,
                  background:'linear-gradient(135deg,rgba(255,107,157,0.2),rgba(78,205,196,0.2))',
                  border:'1px solid rgba(255,255,255,0.07)',
                  display:'flex', alignItems:'center', justifyContent:'center' }}>
                  <UserIcon size={12} color="rgba(255,255,255,0.5)"/>
                </div>
                <div style={{ flex:1, minWidth:0 }}>
                  <div style={{ color:'#fff', fontSize:13, fontFamily:'monospace',
                    whiteSpace:'nowrap', overflow:'hidden', textOverflow:'ellipsis' }}>
                    {activeUser.username}
                  </div>
                  {sharedKey === 'error' ? (
                    <div style={{ color:'#ff6b9d', fontSize:8, fontFamily:'monospace', letterSpacing:1.5, marginTop:1 }}>
                      ⚠ SCHLÜSSEL INKOMPATIBEL
                    </div>
                  ) : partnerFp ? (
                    <div title={`Fingerprint von ${activeUser.username} – vergleiche mit dessen Anzeige unter Einstellungen → Sicherheit`}
                      style={{ color:'rgba(78,205,196,0.55)', fontSize:8, fontFamily:'monospace', letterSpacing:1, marginTop:2,
                        cursor:'help', whiteSpace:'nowrap', overflow:'hidden', textOverflow:'ellipsis' }}>
                      🔒 {partnerFp}
                    </div>
                  ) : (
                    <div style={{ color:'rgba(78,205,196,0.35)', fontSize:8, fontFamily:'monospace', letterSpacing:1.5, marginTop:1 }}>
                      🔒 E2E VERSCHLÜSSELT · X25519 + AES-256-GCM
                    </div>
                  )}
                </div>
                <button onClick={deleteConversation} style={{ ...S.btn('#ff6b9d', true), fontSize:10, flexShrink:0 }}>
                  Verlauf löschen
                </button>
              </div>

              {/* Nachrichten */}
              <div style={{ flex:1, overflowY:'auto', padding: mirc ? '0' : '14px',
                display:'flex', flexDirection:'column', gap: mirc ? 0 : 10,
                background: mirc ? '#000' : undefined,
                fontFamily: mirc ? "'Courier New', Courier, monospace" : undefined }}>
                {!activeUser.public_key && (
                  <InfoBox color="#ffe66d">
                    ⚠ Dieser Benutzer hat die Nachrichten noch nicht geöffnet und besitzt noch kein Schlüsselpaar.
                  </InfoBox>
                )}
                {sharedKey === 'error' && (
                  <InfoBox color="#ff6b9d">
                    ⚠ Schlüssel inkompatibel – der Empfänger verwendet ein anderes Schlüsselformat.
                    Er muss in Einstellungen → Sicherheit einen neuen Schlüssel generieren.
                  </InfoBox>
                )}
                {messages.length === 0 && activeUser.public_key && sharedKey !== 'error' && (
                  <div style={{ flex:1, display:'flex', alignItems:'center', justifyContent:'center',
                    color: mirc ? '#808080' : 'rgba(255,255,255,0.18)',
                    fontFamily: mirc ? "'Courier New', monospace" : 'monospace', fontSize:11 }}>
                    {mirc ? '*** Noch keine Nachrichten ***' : 'Noch keine Nachrichten'}
                  </div>
                )}
                {Object.values(decrypted).some(v => v === null) && (
                  <InfoBox color="#ffe66d">
                    🔑 Einige Nachrichten können nicht entschlüsselt werden.
                    Importiere deinen alten Schlüssel unter Einstellungen → Sicherheit.
                  </InfoBox>
                )}

                {mirc ? (
                  /* ── mIRC Design ─────────────────────────────────────── */
                  <div style={{ padding:'4px 0' }}>
                    {messages.map(m => {
                      const isMine = !!m.is_mine;
                      const txt    = decrypted[m.id];
                      const time   = m.created_at ? (() => { const d = new Date(m.created_at.replace(' ','T')); return isNaN(d)?'':d.toLocaleTimeString('de-DE',{hour:'2-digit',minute:'2-digit'}); })() : '';
                      const nick   = isMine ? 'du' : activeUser.username;
                      const nickColor = isMine ? '#00ff00' : '#00ffff';
                      return (
                        <div key={m.id} style={{ display:'flex', alignItems:'baseline', gap:0,
                          padding:'1px 8px', lineHeight:1.5,
                          background: isMine ? 'rgba(0,255,0,0.03)' : 'transparent' }}
                          onMouseEnter={e=>e.currentTarget.style.background='rgba(255,255,255,0.04)'}
                          onMouseLeave={e=>e.currentTarget.style.background=isMine?'rgba(0,255,0,0.03)':'transparent'}>
                          <span style={{ color:'#808080', fontSize:11, flexShrink:0, marginRight:2 }}>[{time}]</span>
                          <span style={{ color:'#808080', fontSize:11, flexShrink:0, marginRight:2 }}>&lt;</span>
                          <span style={{ color:nickColor, fontSize:11, fontWeight:700, flexShrink:0 }}>{nick}</span>
                          <span style={{ color:'#808080', fontSize:11, flexShrink:0, marginRight:6 }}>&gt;</span>
                          <span style={{ color: txt===null?'#404040':'#d0d0d0', fontSize:12, wordBreak:'break-word', flex:1 }}>
                            {txt===undefined ? '…' : txt===null ? '[verschlüsselt]' : txt}
                          </span>
                          {isMine && m.read_by_recipient && <span style={{color:'#004400',fontSize:9,marginLeft:4,flexShrink:0}}>✓✓</span>}
                          <button onClick={() => deleteMsg(m.id)} style={{ background:'transparent', border:'none',
                            cursor:'pointer', color:'#400000', fontSize:9, padding:'0 0 0 6px', flexShrink:0, opacity:0.5 }}>✕</button>
                        </div>
                      );
                    })}
                  </div>
                ) : (
                  /* ── Modernes Design ─────────────────────────────────── */
                  <>
                    {messages.map(m => {
                      const isMine = !!m.is_mine;
                      const txt    = decrypted[m.id];
                      return (
                        <div key={m.id} style={{ display:'flex',
                          justifyContent: isMine ? 'flex-end' : 'flex-start', gap:6, alignItems:'flex-end' }}>
                          {!isMine && (
                            <div style={{ width:22, height:22, borderRadius:'50%', flexShrink:0,
                              background:'rgba(255,255,255,0.04)', border:'1px solid rgba(255,255,255,0.07)',
                              display:'flex', alignItems:'center', justifyContent:'center', fontSize:10 }}>👤</div>
                          )}
                          <div style={{ maxWidth:'75%', display:'flex', flexDirection:'column',
                            alignItems: isMine ? 'flex-end' : 'flex-start', gap:4 }}>
                            <div style={{
                              background: isMine ? 'rgba(78,205,196,0.09)' : 'rgba(255,255,255,0.04)',
                              border: `1px solid ${isMine ? 'rgba(78,205,196,0.15)' : 'rgba(255,255,255,0.07)'}`,
                              borderRadius: isMine ? '12px 12px 3px 12px' : '12px 12px 12px 3px',
                              padding:'8px 12px',
                            }}>
                              {txt === undefined ? (
                                <span style={{ color:'rgba(255,255,255,0.18)', fontSize:12 }}>⋯</span>
                              ) : txt === null ? (
                                <span style={{ color:'rgba(255,107,157,0.5)', fontSize:11, fontFamily:'monospace' }}>🔒 Nicht entschlüsselbar</span>
                              ) : (
                                <span style={{ color:'#e6e6e6', fontSize:13, fontFamily:'monospace',
                                  lineHeight:1.55, whiteSpace:'pre-wrap', wordBreak:'break-word' }}>{txt}</span>
                              )}
                            </div>
                            <div style={{ display:'flex', alignItems:'center', gap:5 }}>
                              <span style={{ color:'rgba(255,255,255,0.18)', fontSize:9, fontFamily:'monospace', whiteSpace:'nowrap' }}>
                                {formatMsgTime(m.created_at)}
                              </span>
                              {isMine && (
                                <span title={m.read_by_recipient ? 'Gelesen' : 'Gesendet'}
                                  style={{ fontSize:10, lineHeight:1, color: m.read_by_recipient ? '#4ecdc4' : 'rgba(255,255,255,0.2)' }}>
                                  {m.read_by_recipient ? '✓✓' : '✓'}
                                </span>
                              )}
                              <button onClick={() => deleteMsg(m.id)} style={{ background:'transparent', border:'none',
                                cursor:'pointer', padding:'0 2px', opacity:0.3, lineHeight:1,
                                display:'flex', alignItems:'center' }}>
                                <TrashIcon size={10} color="#ff6b9d"/>
                              </button>
                            </div>
                          </div>
                        </div>
                      );
                    })}
                  </>
                )}
                <div ref={bottomRef}/>
              </div>

              {/* Eingabe */}
              <div style={{ padding:'10px 14px', flexShrink:0,
                borderTop:`1px solid ${mirc?'#333':'rgba(255,255,255,0.06)'}`,
                background: mirc ? '#000' : '#0d0d0f' }}>
                {!activeUser.public_key || sharedKey === 'error' ? (
                  <div style={{ color:'rgba(255,255,255,0.2)', fontSize:11, fontFamily:'monospace',
                    textAlign:'center', padding:'8px 0' }}>
                    Senden nicht möglich
                  </div>
                ) : (
                  <div style={{ display:'flex', gap:8, alignItems:'stretch', position:'relative' }}>
                    <div ref={pickerRef} style={{ position:'absolute', bottom:'100%', right:0 }}>
                      {showPicker && (
                        <EmojiPicker
                          onSelect={em => { setText(t => t + em); setShowPicker(false); }}
                          onClose={() => setShowPicker(false)}
                        />
                      )}
                    </div>
                    {mirc && (
                      <span style={{ color:'#00ff00', fontFamily:"'Courier New',monospace", fontSize:12,
                        alignSelf:'center', flexShrink:0 }}>[du]</span>
                    )}
                    <textarea
                      value={text}
                      onChange={e => {
                        const val = e.target.value;
                        const last = val[val.length - 1];
                        if (last === ' ' || last === '\n') setText(convertEmojis(val));
                        else setText(val);
                      }}
                      onFocus={() => setShowPicker(false)}
                      onKeyDown={e => {
                        if (e.key === 'Enter' && !e.shiftKey) {
                          e.preventDefault();
                          const converted = convertEmojis(text + ' ').trimEnd();
                          if (converted !== text) setText(converted);
                          send(converted);
                        }
                      }}
                      placeholder={mirc ? 'Nachricht…' : 'Nachricht… (Enter senden · Shift+Enter neue Zeile)'}
                      rows={2}
                      style={{ ...S.inp, resize:'none', flex:1, fontSize: mirc ? 12 : 13,
                        padding:'8px 10px', lineHeight:1.45, minHeight:42,
                        ...(mirc ? { background:'#111', border:'1px solid #444', color:'#d0d0d0',
                          fontFamily:"'Courier New',monospace", borderRadius:2 } : {}) }}
                    />
                    <button onClick={() => setShowPicker(v => !v)} style={{
                      background: showPicker ? 'rgba(78,205,196,0.12)' : (mirc ? '#111' : 'rgba(255,255,255,0.05)'),
                      border:`1px solid ${showPicker ? 'rgba(78,205,196,0.3)' : (mirc ? '#444' : 'rgba(255,255,255,0.1)')}`,
                      borderRadius: mirc ? 2 : 8, cursor:'pointer', fontSize:17,
                      padding:'0 10px', flexShrink:0, alignSelf:'stretch' }}>😊</button>
                  </div>
                )}
              </div>
            </>
          )}
        </div>
      )}
    </div>
  );
}

function InfoBox({ color, children }) {
  return (
    <div style={{ background:`${color}08`, border:`1px solid ${color}25`,
      borderRadius:8, padding:'10px 14px', color, fontSize:11,
      fontFamily:'monospace', textAlign:'center', lineHeight:1.7 }}>
      {children}
    </div>
  );
}

function formatMsgTime(isoStr) {
  if (!isoStr) return '';
  const d   = new Date(isoStr.replace(' ', 'T'));
  if (isNaN(d)) return '';
  const now = new Date();
  const isToday    = d.toDateString() === now.toDateString();
  const isThisYear = d.getFullYear() === now.getFullYear();
  const time = d.toLocaleTimeString('de-DE', { hour:'2-digit', minute:'2-digit' });
  if (isToday)    return `Heute, ${time}`;
  if (isThisYear) return `${d.toLocaleDateString('de-DE', { day:'numeric', month:'short' })}, ${time}`;
  return `${d.toLocaleDateString('de-DE', { day:'numeric', month:'short', year:'numeric' })}, ${time}`;
}