import { useState, useEffect } from 'react';
import { BarChart, Bar, LineChart, Line, XAxis, YAxis, Tooltip, ResponsiveContainer, Cell, PieChart, Pie, Legend } from 'recharts';

const api = (path, opts={}) => {
  const token = localStorage.getItem('sk_token');
  return fetch('/api' + path, {
    headers: { 'Content-Type':'application/json', ...(token?{'Authorization':'Bearer '+token}:{}) },
    ...(opts.body ? { method: opts.method||'POST', body: JSON.stringify(opts.body) } : { method: opts.method||'GET' }),
  }).then(r => r.json());
};

const S = {
  card:  { background:'rgba(255,255,255,0.03)', border:'1px solid rgba(255,255,255,0.07)', borderRadius:12, padding:'16px 18px', marginBottom:12 },
  head:  { color:'rgba(255,255,255,0.4)', fontFamily:'monospace', fontSize:10, letterSpacing:1, marginBottom:10, fontWeight:700 },
  val:   (c='#fff') => ({ color:c, fontFamily:"'Space Mono',monospace", fontSize:22, fontWeight:700 }),
  sub:   { color:'rgba(255,255,255,0.3)', fontFamily:'monospace', fontSize:10 },
  inp:   { background:'rgba(255,255,255,0.06)', border:'1px solid rgba(255,255,255,0.12)', borderRadius:8, padding:'8px 12px', color:'#fff', fontFamily:'monospace', fontSize:12, outline:'none', width:'100%', boxSizing:'border-box' },
  btn:   (c='#4ecdc4') => ({ background:`${c}18`, border:`1px solid ${c}44`, borderRadius:8, padding:'8px 14px', color:c, fontFamily:'monospace', fontSize:11, cursor:'pointer' }),
};

const CATS = ['Filament','Zubehör','Ersatzteile','Werkzeug','Sonstiges'];
const CAT_COLORS = { Filament:'#4ecdc4', Zubehör:'#ffe66d', Ersatzteile:'#ff6b9d', Werkzeug:'#60a5fa', Sonstiges:'#c084fc' };

const fmt = v => `${(v||0).toFixed(2)} €`;
// Lokales Datum als YYYY-MM-DD (kein UTC-Bug wie bei toISOString)
function todayLocal() {
  const d = new Date();
  const y = d.getFullYear(), m = String(d.getMonth()+1).padStart(2,'0'), day = String(d.getDate()).padStart(2,'0');
  return `${y}-${m}-${day}`;
}

const fmtMonth = m => {
  if (!m) return '';
  if (/^\d{4}-\d{2}$/.test(m)) {
    const [y,mo] = m.split('-');
    return ['Jan','Feb','Mär','Apr','Mai','Jun','Jul','Aug','Sep','Okt','Nov','Dez'][parseInt(mo)-1]+' '+y.slice(2);
  }
  if (/^\d{4}-\d{2}-\d{2}$/.test(m)) {
    const [,mo,d] = m.split('-');
    return `${d}.${mo}.`;
  }
  return m;
};

// Bei Wochen-Granularität: zeigt "15.06. – 21.06." statt nur den Montag
const fmtMonthRange = (m, granularity) => {
  if (!m || granularity !== 'week' || !/^\d{4}-\d{2}-\d{2}$/.test(m)) return fmtMonth(m);
  const [y,mo,d] = m.split('-').map(Number);
  const start = new Date(y, mo-1, d);
  const end = new Date(y, mo-1, d+6);
  const f = dt => `${String(dt.getDate()).padStart(2,'0')}.${String(dt.getMonth()+1).padStart(2,'0')}.`;
  return `${f(start)} – ${f(end)}`;
};

const PERIODS = [
  { id:'week',   label:'Diese Woche' },
  { id:'month',  label:'Dieser Monat' },
  { id:'year',   label:'Dieses Jahr'  },
  { id:'custom', label:'Eigener Zeitraum' },
  { id:'all',    label:'Gesamt'},
];

// Generiere Monat-Optionen (letzten 24 Monate)
function getMonthOptions() {
  const opts = [];
  const now = new Date();
  for (let i = 0; i < 24; i++) {
    const d = new Date(now.getFullYear(), now.getMonth() - i, 1);
    const val = `${d.getFullYear()}-${String(d.getMonth()+1).padStart(2,'0')}`;
    const label = d.toLocaleDateString('de-DE', { month:'long', year:'numeric' });
    opts.push({ val, label });
  }
  return opts;
}

// Generiere Jahr-Optionen
function getYearOptions() {
  const opts = [];
  const now = new Date().getFullYear();
  for (let y = now; y >= now - 5; y--) opts.push(y);
  return opts;
}

function periodRange(id, custom) {
  const now = new Date();
  const pad = n => String(n).padStart(2,'0');
  const iso = d => `${d.getFullYear()}-${pad(d.getMonth()+1)}-${pad(d.getDate())}`;
  if (id==='week')  {
    const d = new Date(now);
    const day = d.getDay() || 7; // 1=Mo … 7=So
    d.setDate(d.getDate() - (day - 1)); // zurück auf Montag
    return { from:iso(d), to:iso(now) };
  }
  if (id==='month') { const d=new Date(now.getFullYear(),now.getMonth(),1); return { from:iso(d), to:iso(now) }; }
  if (id==='year')  { return { from:`${now.getFullYear()}-01-01`, to:iso(now) }; }
  if (id==='custom' && custom) {
    if (custom.type==='month' && custom.month) {
      const [y,m] = custom.month.split('-').map(Number);
      const last = new Date(y, m, 0);
      return { from:`${y}-${pad(m)}-01`, to:iso(last) };
    }
    if (custom.type==='year' && custom.year) {
      return { from:`${custom.year}-01-01`, to:`${custom.year}-12-31` };
    }
  }
  return {};
}

function KPI({ label, value, color, sub }) {
  return (
    <div style={{flex:1,minWidth:130}}>
      <div style={S.sub}>{label}</div>
      <div style={S.val(color)}>{value}</div>
      {sub && <div style={{...S.sub,marginTop:2}}>{sub}</div>}
    </div>
  );
}

// Bestellungen im gewählten Zeitraum
function OrdersInPeriod({ fromDate, toDate }) {
  const [orders, setOrders] = useState(null);

  useEffect(() => {
    const q = (fromDate || toDate) ? `?from=${fromDate}&to=${toDate}` : '';
    api(`/tools/statistik/month-orders${q}`).then(setOrders).catch(()=>setOrders([]));
  }, [fromDate, toDate]);

  const STATUS_ORDER = ['warteliste','in_arbeit','fertig','bezahlt','abgeschlossen'];
  const STATUS_COLOR = { warteliste:'#ffe66d', in_arbeit:'#4ecdc4', fertig:'#6bcb77', bezahlt:'#c084fc', abgeschlossen:'#4ade80' };
  const STATUS_LABEL = { warteliste:'Warteliste', in_arbeit:'In Arbeit', fertig:'Fertig', bezahlt:'Bezahlt', abgeschlossen:'Abgeschlossen' };

  const periodLabel = (fromDate || toDate) ? 'IM ZEITRAUM' : 'GESAMT';

  // Gruppieren nach Status
  const grouped = {};
  (orders||[]).forEach(o => {
    const st = !!o.bezahlt && !!o.abgeholt ? 'abgeschlossen' : !!o.bezahlt ? 'bezahlt' : o.status;
    if (!grouped[st]) grouped[st] = [];
    grouped[st].push({ ...o, _st: st });
  });

  // Innerhalb jeder Gruppe nach Datum sortieren (neueste zuerst)
  Object.values(grouped).forEach(g => g.sort((a,b) => new Date(b.created_at) - new Date(a.created_at)));

  return (
    <div style={S.card}>
      <div style={S.head}>BESTELLUNGEN {periodLabel} {orders ? `(${orders.length})` : ''}</div>
      {!orders
        ? <div style={{color:'rgba(255,255,255,0.3)',fontFamily:'monospace',fontSize:12}}>Lädt…</div>
        : !orders.length
          ? <div style={{color:'rgba(255,255,255,0.3)',fontFamily:'monospace',fontSize:12}}>Keine Bestellungen im Zeitraum.</div>
          : STATUS_ORDER.filter(st => grouped[st]?.length).map(st => {
            const col = STATUS_COLOR[st];
            const group = grouped[st];
            const total = group.reduce((s,o)=>s+(o.revenue||0),0);
            return (
              <div key={st} style={{marginBottom:16}}>
                {/* Status-Header mit Summe */}
                <div style={{display:'flex',alignItems:'center',justifyContent:'space-between',
                  padding:'6px 10px',background:`${col}10`,borderRadius:8,marginBottom:6}}>
                  <div style={{display:'flex',alignItems:'center',gap:8}}>
                    <span style={{background:`${col}20`,border:`1px solid ${col}44`,borderRadius:10,
                      padding:'2px 10px',color:col,fontFamily:'monospace',fontSize:10}}>
                      {STATUS_LABEL[st]}
                    </span>
                    <span style={{color:'rgba(255,255,255,0.35)',fontFamily:'monospace',fontSize:10}}>
                      {group.length} Bestellung{group.length!==1?'en':''}
                    </span>
                  </div>
                  {total > 0 && (
                    <span style={{color:col,fontFamily:"'Space Mono',monospace",fontSize:12,fontWeight:700}}>
                      Σ {fmt(total)}
                    </span>
                  )}
                </div>
                {/* Einträge */}
                {group.map(o => (
                  <div key={o.id} style={{display:'flex',alignItems:'center',gap:10,padding:'7px 10px',
                    borderBottom:'1px solid rgba(255,255,255,0.04)'}}>
                    <span style={{color:'rgba(255,255,255,0.3)',fontFamily:'monospace',fontSize:10,flexShrink:0,width:60}}>
                      {new Date(o.created_at).toLocaleDateString('de-DE',{day:'2-digit',month:'2-digit'})}
                    </span>
                    <span style={{color:'rgba(255,255,255,0.8)',fontFamily:'monospace',fontSize:12,flex:1}}>
                      {o.name}
                    </span>
                    <span style={{color:o.revenue>0?'#4ade80':'rgba(255,255,255,0.25)',
                      fontFamily:"'Space Mono',monospace",fontSize:12,fontWeight:700,flexShrink:0}}>
                      {fmt(o.revenue||0)}
                    </span>
                  </div>
                ))}
              </div>
            );
          })
      }
    </div>
  );
}

// MakerWorld Creator-Center Statistik
function MakerworldTab({ toast }) {
  const [state, setState]   = useState(null); // { configured, data, error, fetchedAt, needsCode }
  const [loading, setLoading] = useState(true);
  const [refreshing, setRefreshing] = useState(false);
  const [showModels, setShowModels] = useState(false);
  const [loginStatus, setLoginStatus] = useState(null);

  const [credForm, setCredForm] = useState({ username:'', password:'' });
  const [savingCreds, setSavingCreds] = useState(false);
  const [codeInput, setCodeInput] = useState('');
  const [submittingCode, setSubmittingCode] = useState(false);

  const [cookieInput, setCookieInput] = useState('');
  const [savingCookie, setSavingCookie] = useState(false);
  const [showCookieFallback, setShowCookieFallback] = useState(false);

  const [debugImgUrl, setDebugImgUrl] = useState(null);
  const [loadingScreenshot, setLoadingScreenshot] = useState(false);

  const load = () => {
    setLoading(true);
    api('/tools/makerworld/stats').then(setState).catch(()=>{}).finally(()=>setLoading(false));
  };
  const loadLoginStatus = () => {
    api('/tools/makerworld/login-status').then(setLoginStatus).catch(()=>{});
  };

  useEffect(() => { load(); loadLoginStatus(); }, []);

  // Solange auf einen Code gewartet wird, alle paar Sekunden pollen
  useEffect(() => {
    if (!state?.needsCode) return;
    const iv = setInterval(() => { load(); loadLoginStatus(); }, 5000);
    return () => clearInterval(iv);
  }, [state?.needsCode]);

  const refresh = async () => {
    setRefreshing(true);
    try {
      const r = await api('/tools/makerworld/refresh', { method:'POST' });
      setState(p => ({ ...p, ...r }));
      loadLoginStatus();
      if (r.needsCode) toast?.('MakerWorld verlangt einen E-Mail-Verifizierungscode');
      else if (r.error) toast?.(r.error,'error');
      else toast?.('Aktualisiert');
    } catch(e) { toast?.(e.message,'error'); }
    finally { setRefreshing(false); }
  };

  const saveCredentials = async () => {
    if (!credForm.username.trim() || !credForm.password) return;
    setSavingCreds(true);
    try {
      const r = await api('/tools/makerworld/credentials', { body:credForm });
      setCredForm({ username:'', password:'' });
      setState(p => ({ ...p, ...r, configured:true }));
      loadLoginStatus();
      if (r.needsCode) toast?.('Zugangsdaten gespeichert — E-Mail-Code erforderlich');
      else if (r.error) toast?.('Gespeichert, aber Testabruf fehlgeschlagen: '+r.error,'error');
      else toast?.('Zugangsdaten gespeichert, Abruf erfolgreich');
    } catch(e) { toast?.(e.message,'error'); }
    finally { setSavingCreds(false); }
  };

  const removeCredentials = async () => {
    try {
      await api('/tools/makerworld/credentials', { method:'DELETE' });
      toast?.('Zugangsdaten entfernt');
      setState({ configured:false, data:null, error:null, fetchedAt:null, needsCode:false });
      loadLoginStatus();
    } catch(e) { toast?.(e.message,'error'); }
  };

  const viewDebugScreenshot = async () => {
    setLoadingScreenshot(true);
    try {
      const r = await api('/tools/makerworld/debug-screenshot');
      if (!r.image) { toast?.('Kein Debug-Screenshot vorhanden','error'); return; }
      setDebugImgUrl(r.image); // bereits eine data:-URI, CSP-konform (kein blob:)
    } catch(e) { toast?.(e.message,'error'); }
    finally { setLoadingScreenshot(false); }
  };

  const submitCode = async () => {
    if (!codeInput.trim()) return;
    setSubmittingCode(true);
    try {
      const r = await api('/tools/makerworld/verify-code', { body:{ code:codeInput.trim() } });
      setState(p => ({ ...p, ...r }));
      loadLoginStatus();
      if (r.needsCode) toast?.(r.error || 'Code nicht akzeptiert, nochmal versuchen','error');
      else if (r.error) toast?.(r.error,'error');
      else { toast?.('Login erfolgreich'); setCodeInput(''); }
    } catch(e) { toast?.(e.message,'error'); }
    finally { setSubmittingCode(false); }
  };

  const saveCookie = async () => {
    if (!cookieInput.trim()) return;
    setSavingCookie(true);
    try {
      const r = await api('/tools/makerworld/cookie', { body:{ cookie: cookieInput } });
      setCookieInput('');
      setState(p => ({ ...p, ...r, configured:true }));
      if (r.error) toast?.('Gespeichert, aber Testabruf fehlgeschlagen: '+r.error,'error');
      else toast?.('Cookie übernommen, Abruf erfolgreich');
      loadLoginStatus();
    } catch(e) { toast?.(e.message,'error'); }
    finally { setSavingCookie(false); }
  };

  if (loading) return <div style={{color:'rgba(255,255,255,0.3)',fontFamily:'monospace',fontSize:12}}>Lädt…</div>;

  const d = state?.data;
  const fmtInt = v => (v ?? 0).toLocaleString('de-DE');
  const fmtAgo = ts => {
    if (!ts) return '—';
    const min = Math.round((Date.now()-ts)/60000);
    if (min < 1) return 'gerade eben';
    if (min < 60) return `vor ${min} Min.`;
    return `vor ${Math.round(min/60)} Std.`;
  };

  return (
    <div>
      {/* Admin: Code-Eingabe hat höchste Priorität, wenn gerade angefordert */}
      {state?.needsCode && (
        <div style={{...S.card,borderColor:'rgba(255,230,109,0.4)',background:'rgba(255,230,109,0.08)'}}>
          <div style={{...S.head,color:'#ffe66d'}}>📧 VERIFIZIERUNGSCODE ERFORDERLICH</div>
          <div style={{...S.sub,marginBottom:8}}>
            MakerWorld hat einen Code an deine E-Mail-Adresse geschickt. Bitte hier eintragen
            (5 Minuten Zeit, danach muss der Login-Versuch neu gestartet werden).
          </div>
          <div style={{display:'flex',gap:8}}>
            <input value={codeInput} onChange={e=>setCodeInput(e.target.value)}
              onKeyDown={e=>e.key==='Enter'&&submitCode()}
              placeholder="Code aus E-Mail" style={{...S.inp,flex:1}}/>
            <button onClick={submitCode} disabled={submittingCode||!codeInput.trim()}
              style={{...S.btn('#ffe66d'),opacity:(submittingCode||!codeInput.trim())?0.5:1,whiteSpace:'nowrap'}}>
              {submittingCode?'…':'✓ Bestätigen'}
            </button>
          </div>
        </div>
      )}

      {/* Admin: Zugangsdaten */}
      {!state?.needsCode && (
        <div style={S.card}>
          <div style={S.head}>MEINE MAKERWORLD-ZUGANGSDATEN</div>
          {loginStatus && (
            <div style={{...S.sub,marginBottom:10}}>
              {loginStatus.configured
                ? `Eingerichtet als "${loginStatus.username}" · Letzter Abruf: ${fmtAgo(loginStatus.lastFetchedAt)}`
                : 'Noch keine Zugangsdaten hinterlegt.'}
              {loginStatus.lastError && <div style={{color:'#f87171',marginTop:4}}>⚠ {loginStatus.lastError}</div>}
            </div>
          )}
          <div style={{...S.sub,marginBottom:8}}>
            Wird verschlüsselt gespeichert und nur für deinen eigenen Abruf genutzt — andere Nutzer sehen
            weder deine Zugangsdaten noch deine Zahlen. Ein echter Browser mit dauerhaftem Profil hält die
            Session am Laufen — bei aktiver Nutzung wird ein erneuter Login kaum je nötig. Falls doch,
            erscheint hier automatisch die Code-Eingabe.
          </div>
          <div style={{display:'flex',gap:8,flexWrap:'wrap',marginBottom:8}}>
            <input value={credForm.username} onChange={e=>setCredForm(p=>({...p,username:e.target.value}))}
              placeholder="E-Mail / Benutzername" style={{...S.inp,flex:1,minWidth:160}}/>
            <input type="password" value={credForm.password} onChange={e=>setCredForm(p=>({...p,password:e.target.value}))}
              onKeyDown={e=>e.key==='Enter'&&saveCredentials()}
              placeholder="Passwort" style={{...S.inp,flex:1,minWidth:160}}/>
          </div>
          <div style={{display:'flex',gap:8,flexWrap:'wrap'}}>
            <button onClick={saveCredentials} disabled={savingCreds||!credForm.username.trim()||!credForm.password}
              style={{...S.btn('#4ade80'),opacity:(savingCreds||!credForm.username.trim()||!credForm.password)?0.5:1}}>
              {savingCreds?'…':'💾 Speichern & testen'}
            </button>
            <button onClick={refresh} disabled={refreshing}
              style={{...S.btn('#4ecdc4'),opacity:refreshing?0.5:1}}>
              {refreshing?'…':'🔄 Neu abrufen'}
            </button>
            <button onClick={()=>setShowCookieFallback(p=>!p)} style={{...S.btn('#888888')}}>
              {showCookieFallback ? '▲ Cookie-Fallback ausblenden' : '⚙ Cookie-Fallback (manuell)'}
            </button>
            {loginStatus?.configured && (
              <button onClick={removeCredentials} style={{...S.btn('#f87171')}}>
                🗑 Zugangsdaten entfernen
              </button>
            )}
          </div>

          {showCookieFallback && (
            <div style={{marginTop:14,paddingTop:14,borderTop:'1px solid rgba(255,255,255,0.07)'}}>
              <div style={{...S.sub,marginBottom:8}}>
                Nur falls der automatische Login nicht funktioniert: kompletten Cookie-Header aus einem
                eingeloggten Browser-Tab kopieren (Entwicklertools → Netzwerk → Request an
                /de/my/data-overview/model → "Cookie"-Header) und hier einfügen.
              </div>
              <textarea value={cookieInput} onChange={e=>setCookieInput(e.target.value)}
                placeholder="lang=de; cf_clearance=...; token=...; ..."
                rows={3} style={{...S.inp,resize:'vertical',fontSize:10,marginBottom:8}}/>
              <button onClick={saveCookie} disabled={savingCookie||!cookieInput.trim()}
                style={{...S.btn('#4ecdc4'),opacity:(savingCookie||!cookieInput.trim())?0.5:1}}>
                {savingCookie?'…':'💾 Cookie übernehmen & testen'}
              </button>
            </div>
          )}
        </div>
      )}

      {state?.error && (
        <div style={{...S.card,borderColor:'rgba(248,113,113,0.3)',background:'rgba(248,113,113,0.06)'}}>
          <div style={{color:'#f87171',fontFamily:'monospace',fontSize:11,marginBottom:8}}>
            ⚠ {state.error}{d ? ' — zeige zuletzt bekannten Stand.' : ''}
          </div>
          <button onClick={viewDebugScreenshot} disabled={loadingScreenshot}
            style={{...S.btn('#888888'),opacity:loadingScreenshot?0.5:1}}>
            {loadingScreenshot?'…':'🖼 Debug-Screenshot ansehen'}
          </button>
          {debugImgUrl && (
            <div style={{marginTop:10}}>
              <img src={debugImgUrl} alt="Debug-Screenshot" style={{width:'100%',borderRadius:8,border:'1px solid rgba(255,255,255,0.1)'}}/>
            </div>
          )}
        </div>
      )}

      {d && (
        <>
          <div style={S.card}>
            <div style={S.head}>CREATOR CENTER {state.fetchedAt ? `· ${fmtAgo(state.fetchedAt)}` : ''}</div>
            <div style={{display:'flex',flexWrap:'wrap',gap:20,marginBottom:16}}>
              <KPI label="Downloads" value={fmtInt(d.downloads)} color="#4ecdc4"/>
              <KPI label="Prints" value={fmtInt(d.prints)} color="#4ecdc4"/>
              <KPI label="Likes" value={fmtInt(d.likes)} color="#ff6b9d"/>
              <KPI label="Collections" value={fmtInt(d.collections)} color="#ff6b9d"/>
              <KPI label="Boosts" value={fmtInt(d.boosts)} color="#ffe66d"/>
              <KPI label="Follower" value={fmtInt(d.followers)} color="#ffe66d"/>
            </div>
            <div style={{borderTop:'1px solid rgba(255,255,255,0.06)',paddingTop:16,display:'flex',flexWrap:'wrap',gap:20}}>
              <KPI label="Views" value={fmtInt(d.views)} color="#60a5fa"/>
              <KPI label="Impressions" value={fmtInt(d.impressions)} color="#60a5fa"/>
              <KPI label="Creator Points" value={fmtInt(d.creatorPoints)} color="#c084fc"/>
              <KPI label="Model Points" value={fmtInt(d.modelPoints)} color="#c084fc" sub="aus Modellen"/>
              <KPI label="MakerLab Points" value={fmtInt(d.instructionPoints)} color="#c084fc" sub="aus Anleitungen"/>
            </div>
          </div>

          {d.models?.length > 0 && (
            <div style={S.card}>
              <div style={{display:'flex',alignItems:'center',justifyContent:'space-between',marginBottom:showModels?10:0}}>
                <div style={{...S.head,marginBottom:0}}>MODELLE ({d.models.length})</div>
                <button onClick={()=>setShowModels(p=>!p)} style={{...S.btn('#888888'),fontSize:10}}>
                  {showModels ? '▲ einklappen' : '▼ anzeigen'}
                </button>
              </div>
              {showModels && [...d.models].sort((a,b)=>b.downloads-a.downloads).map(m => (
                <div key={m.id} style={{display:'flex',alignItems:'center',gap:10,padding:'8px 0',
                  borderBottom:'1px solid rgba(255,255,255,0.05)',flexWrap:'wrap'}}>
                  <span style={{color:'rgba(255,255,255,0.8)',fontFamily:'monospace',fontSize:12,flex:1,minWidth:160}}>
                    {m.title}
                  </span>
                  <span style={{color:'#4ecdc4',fontFamily:"'Space Mono',monospace",fontSize:11}}>↓{fmtInt(m.downloads)}</span>
                  <span style={{color:'#ff6b9d',fontFamily:"'Space Mono',monospace",fontSize:11}}>♥{fmtInt(m.likes)}</span>
                  <span style={{color:'#60a5fa',fontFamily:"'Space Mono',monospace",fontSize:11}}>👁{fmtInt(m.views)}</span>
                  <span style={{color:'#c084fc',fontFamily:"'Space Mono',monospace",fontSize:11}}>{m.points?.toFixed?.(1) ?? m.points}pt</span>
                </div>
              ))}
            </div>
          )}
        </>
      )}
    </div>
  );
}

export default function Statistik({ mobile, user, toast }) {
  const [fromDate, setFromDate] = useState('');
  const [toDate,   setToDate]   = useState(todayLocal());
  const [data,   setData]       = useState(null);
  const [loading,setLoading]    = useState(false);
  const [tab,    setTab]        = useState('overview');

  const [expForm,setExpForm]    = useState({ date: todayLocal(), category:'Filament', description:'', amount:'' });
  const [saving, setSaving]     = useState(false);

  function load() {
    setLoading(true);
    const q = (fromDate || toDate) ? `?from=${fromDate}&to=${toDate}` : '';
    api('/tools/statistik/overview'+q)
      .then(d => setData(d))
      .catch(()=>{})
      .finally(()=>setLoading(false));
  }

  useEffect(() => { load(); }, [fromDate, toDate]);

  async function addExpense() {
    if (!expForm.description || !expForm.amount) return;
    setSaving(true);
    try {
      await api('/tools/statistik/expenses', { body: expForm });
      setExpForm(p => ({ ...p, description:'', amount:'' }));
      load();
    } finally { setSaving(false); }
  }

  async function delExpense(id) {
    await api(`/tools/statistik/expenses/${id}`, { method:'DELETE' });
    load();
  }

  const netColor = (data?.netProfit||0) >= 0 ? '#4ade80' : '#f87171';

  return (
    <div style={{ padding: mobile?'14px 14px 90px':'28px 36px', maxWidth:900 }}>

      {/* ── Header ── */}
      <div style={{display:'flex',alignItems:'center',justifyContent:'space-between',marginBottom:20,flexWrap:'wrap',gap:10}}>
        <h2 style={{color:'#fff',fontFamily:'monospace',fontSize:18,fontWeight:700,margin:0}}>
          📊 3D-Druck Statistik
        </h2>
        {/* Zeitraum */}
        <div style={{display:'flex',gap:8,alignItems:'center',flexWrap:'wrap'}}>
          <div style={{display:'flex',alignItems:'center',gap:6}}>
            <span style={{color:'rgba(255,255,255,0.35)',fontFamily:'monospace',fontSize:11}}>Von</span>
            <input type="date" value={fromDate} onChange={e=>setFromDate(e.target.value)}
              style={{background:'rgba(255,255,255,0.06)',border:'1px solid rgba(255,255,255,0.12)',
                borderRadius:8,padding:'5px 10px',color:'#fff',fontFamily:'monospace',fontSize:11,cursor:'pointer'}}/>
          </div>
          <div style={{display:'flex',alignItems:'center',gap:6}}>
            <span style={{color:'rgba(255,255,255,0.35)',fontFamily:'monospace',fontSize:11}}>Bis</span>
            <input type="date" value={toDate} onChange={e=>setToDate(e.target.value)}
              style={{background:'rgba(255,255,255,0.06)',border:'1px solid rgba(255,255,255,0.12)',
                borderRadius:8,padding:'5px 10px',color:'#fff',fontFamily:'monospace',fontSize:11,cursor:'pointer'}}/>
          </div>
          {fromDate && (
            <button onClick={()=>{setFromDate('');setToDate(todayLocal());}}
              style={{background:'rgba(255,255,255,0.04)',border:'1px solid rgba(255,255,255,0.1)',
                borderRadius:8,padding:'5px 10px',color:'rgba(255,255,255,0.4)',fontFamily:'monospace',fontSize:11,cursor:'pointer'}}>
              ✕ Zurücksetzen
            </button>
          )}
        </div>
      </div>

      {/* ── Tabs ── */}
      <div style={{display:'flex',gap:4,marginBottom:16,overflowX:'auto',overflowY:'hidden',
        scrollbarWidth:'none',WebkitOverflowScrolling:'touch',paddingBottom:2}}>
        {[['overview','📈 Übersicht'],['revenue','💰 Einnahmen'],['expenses','💸 Ausgaben'],['orders','📦 Bestellungen'],['makerworld','🖨️ MakerWorld']].map(([id,label])=>(
          <button key={id} onClick={()=>setTab(id)} style={{
            background: tab===id ? 'rgba(255,255,255,0.08)' : 'transparent',
            border: `1px solid ${tab===id ? 'rgba(255,255,255,0.2)' : 'rgba(255,255,255,0.08)'}`,
            borderRadius:8, padding:'6px 14px', flexShrink:0, whiteSpace:'nowrap',
            color: tab===id ? '#fff' : 'rgba(255,255,255,0.4)',
            fontFamily:'monospace', fontSize:11, cursor:'pointer',
          }}>{label}</button>
        ))}
      </div>

      {loading && <div style={{color:'rgba(255,255,255,0.3)',fontFamily:'monospace',fontSize:12}}>Lädt…</div>}

      {/* ══ ÜBERSICHT ══ */}
      {tab==='overview' && data && (
        <>
          {/* KPI Kacheln */}
          <div style={{...S.card}}>
            <div style={S.head}>EINNAHMEN & GEWINN</div>
            <div style={{display:'flex',flexWrap:'wrap',gap:20,marginBottom:16}}>
              <KPI label="Eingenommen" value={fmt(data.totalRevenue)} color="#4ade80" sub="bezahlt"/>
              <KPI label="Offen" value={fmt(data.openRevenue)} color="#ffe66d" sub="in Arbeit/Fertig"/>
              <KPI label="Materialkosten" value={fmt(data.totalBaseCost)} color="#f87171" sub="Selbstkosten"/>
              <KPI label="Rohgewinn" value={fmt(data.totalProfit)} color="#60a5fa" sub="nach Materialkosten"/>
            </div>
            <div style={{borderTop:'1px solid rgba(255,255,255,0.06)',paddingTop:16,display:'flex',flexWrap:'wrap',gap:20}}>
              <KPI label="Ausgaben" value={fmt(data.totalExpenses)} color="#f87171" sub="Einkäufe"/>
              <KPI label="NETTOGEWINN" value={fmt(data.netProfit)} color={netColor} sub="Rohgewinn − Ausgaben"/>
              <KPI label="Bestellungen" value={data.totalOrders} color="rgba(255,255,255,0.6)" sub="im Zeitraum"/>
            </div>
          </div>

          {/* Status-Verteilung */}
          <div style={{...S.card}}>
            <div style={S.head}>BESTELLUNGEN NACH STATUS</div>
            <div style={{display:'flex',flexWrap:'wrap',gap:8}}>
              {[
                ['Warteliste', data.byStatus.warteliste, '#ffe66d'],
                ['In Arbeit',  data.byStatus.in_arbeit,  '#4ecdc4'],
                ['Fertig',     data.byStatus.fertig,     '#6bcb77'],
                ['Bezahlt',    data.byStatus.bezahlt,    '#c084fc'],
                ['Abgeschlossen', data.byStatus.abgeschlossen, '#4ade80'],
              ].map(([label, val, color]) => val > 0 && (
                <div key={label} style={{background:`${color}12`,border:`1px solid ${color}33`,
                  borderRadius:8,padding:'8px 14px',textAlign:'center'}}>
                  <div style={{color,fontFamily:"'Space Mono',monospace",fontSize:18,fontWeight:700}}>{val}</div>
                  <div style={{color:'rgba(255,255,255,0.4)',fontFamily:'monospace',fontSize:9}}>{label}</div>
                </div>
              ))}
            </div>
          </div>

          {/* Balkendiagramm Einnahmen vs Ausgaben */}
          {data.monthlyData.length > 0 && (
            <div style={S.card}>
              <div style={S.head}>EINNAHMEN VS. AUSGABEN {data.granularity==='day'?'(TÄGLICH)':data.granularity==='week'?'(WÖCHENTLICH)':'(MONATLICH)'}</div>
              <ResponsiveContainer width="100%" height={200}>
                <BarChart data={data.monthlyData} margin={{top:0,right:0,bottom:0,left:0}}>
                  <XAxis dataKey="month" tickFormatter={fmtMonth} tick={{fill:'rgba(255,255,255,0.3)',fontSize:10}} axisLine={false} tickLine={false}/>
                  <YAxis tick={{fill:'rgba(255,255,255,0.3)',fontSize:10}} axisLine={false} tickLine={false} tickFormatter={v=>`${v}€`} width={45}/>
                  <Tooltip contentStyle={{background:'#1a1d2e',border:'1px solid rgba(255,255,255,0.1)',borderRadius:8,fontFamily:'monospace',fontSize:11,color:'#fff'}}
                    labelStyle={{color:'rgba(255,255,255,0.6)'}} itemStyle={{color:'#fff'}}
                    formatter={(v,n)=>[`${v.toFixed(2)} €`, n==='revenue'?'Einnahmen':'Ausgaben']}
                    labelFormatter={m => fmtMonthRange(m, data.granularity)}/>
                  <Bar dataKey="revenue"  fill="#4ade80" radius={[4,4,0,0]} maxBarSize={28}/>
                  <Bar dataKey="expenses" fill="#f87171" radius={[4,4,0,0]} maxBarSize={28}/>
                </BarChart>
              </ResponsiveContainer>
            </div>
          )}

          {/* Kumulierter Gewinn + Ausgaben nach Kategorie */}
          <div style={{display:'flex',gap:12,flexWrap:'wrap'}}>
            {data.cumulativeData.length > 1 && (
              <div style={{...S.card,flex:1,minWidth:200}}>
                <div style={S.head}>NETTOGEWINN IM ZEITVERLAUF</div>
                <ResponsiveContainer width="100%" height={160}>
                  <LineChart data={data.cumulativeData} margin={{top:5,right:5,bottom:0,left:0}}>
                    <XAxis dataKey="month" tickFormatter={fmtMonth} tick={{fill:'rgba(255,255,255,0.3)',fontSize:9}} axisLine={false} tickLine={false}/>
                    <YAxis tick={{fill:'rgba(255,255,255,0.3)',fontSize:9}} axisLine={false} tickLine={false} tickFormatter={v=>`${v}€`} width={42}/>
                    <Tooltip contentStyle={{background:'#1a1d2e',border:'1px solid rgba(255,255,255,0.1)',borderRadius:8,fontFamily:'monospace',fontSize:11,color:'#fff'}}
                      labelStyle={{color:'rgba(255,255,255,0.6)'}} itemStyle={{color:'#4ecdc4'}}
                      formatter={v=>[`${v.toFixed(2)} €`, 'Gewinn kumuliert']} labelFormatter={m => fmtMonthRange(m, data.granularity)}/>
                    <Line type="monotone" dataKey="value" stroke="#4ecdc4" strokeWidth={2} dot={false}/>
                  </LineChart>
                </ResponsiveContainer>
              </div>
            )}
            {Object.keys(data.byCategory).length > 0 && (
              <div style={{...S.card,flex:1,minWidth:200}}>
                <div style={S.head}>AUSGABEN NACH KATEGORIE</div>
                <ResponsiveContainer width="100%" height={160}>
                  <PieChart>
                    <Pie data={Object.entries(data.byCategory).map(([name,value])=>({name,value}))}
                      cx="50%" cy="50%" innerRadius={40} outerRadius={65}
                      dataKey="value" paddingAngle={3}>
                      {Object.entries(data.byCategory).map(([name],i)=>(
                        <Cell key={name} fill={CAT_COLORS[name]||'#888'}/>
                      ))}
                    </Pie>
                    <Tooltip contentStyle={{background:'#1a1d2e',border:'1px solid rgba(255,255,255,0.1)',borderRadius:8,fontFamily:'monospace',fontSize:11,color:'#fff'}}
                    labelStyle={{color:'rgba(255,255,255,0.6)'}} itemStyle={{color:'#fff'}}
                      formatter={v=>[`${v.toFixed(2)} €`]}/>
                    <Legend iconType="circle" iconSize={8}
                      formatter={v=><span style={{color:'rgba(255,255,255,0.5)',fontFamily:'monospace',fontSize:9}}>{v}</span>}/>
                  </PieChart>
                </ResponsiveContainer>
              </div>
            )}
          </div>
        </>
      )}

      {/* ══ AUSGABEN ══ */}
      {tab==='expenses' && (
        <>
          {/* Formular */}
          <div style={S.card}>
            <div style={S.head}>NEUE AUSGABE</div>
            <div style={{display:'flex',gap:8,flexWrap:'wrap'}}>
              <input type="date" value={expForm.date}
                onChange={e=>setExpForm(p=>({...p,date:e.target.value}))}
                style={{...S.inp,width:140}}/>
              <select value={expForm.category}
                onChange={e=>setExpForm(p=>({...p,category:e.target.value}))}
                style={{...S.inp,width:130}}>
                {CATS.map(c=><option key={c}>{c}</option>)}
              </select>
              <input placeholder="Beschreibung" value={expForm.description}
                onChange={e=>setExpForm(p=>({...p,description:e.target.value}))}
                style={{...S.inp,flex:1,minWidth:140}}/>
              <input type="number" placeholder="0.00" step="0.01" min="0" value={expForm.amount}
                onChange={e=>setExpForm(p=>({...p,amount:e.target.value}))}
                onKeyDown={e=>e.key==='Enter'&&addExpense()}
                style={{...S.inp,width:90,textAlign:'right'}}/>
              <button onClick={addExpense} disabled={saving}
                style={{...S.btn('#4ade80'),opacity:saving?0.5:1,whiteSpace:'nowrap'}}>
                {saving?'…':'+ Hinzufügen'}
              </button>
            </div>
          </div>

          {/* Liste */}
          <div style={S.card}>
            <div style={S.head}>AUSGABEN {(fromDate||toDate!==todayLocal())&&'(IM ZEITRAUM)'}</div>
            {!data?.expenses?.length
              ? <div style={{color:'rgba(255,255,255,0.3)',fontFamily:'monospace',fontSize:12}}>Keine Ausgaben im gewählten Zeitraum.</div>
              : data.expenses.map(e => (
                <div key={e.id} style={{display:'flex',alignItems:'center',gap:10,padding:'8px 0',
                  borderBottom:'1px solid rgba(255,255,255,0.05)'}}>
                  <span style={{color:'rgba(255,255,255,0.3)',fontFamily:'monospace',fontSize:10,flexShrink:0,width:80}}>
                    {e.date}
                  </span>
                  <span style={{background:`${CAT_COLORS[e.category]||'#888'}18`,
                    border:`1px solid ${CAT_COLORS[e.category]||'#888'}44`,
                    borderRadius:6,padding:'2px 8px',color:CAT_COLORS[e.category]||'#888',
                    fontFamily:'monospace',fontSize:9,flexShrink:0}}>
                    {e.category}
                  </span>
                  <span style={{color:'rgba(255,255,255,0.7)',fontFamily:'monospace',fontSize:12,flex:1}}>
                    {e.description}
                  </span>
                  <span style={{color:'#f87171',fontFamily:"'Space Mono',monospace",fontSize:13,fontWeight:700,flexShrink:0}}>
                    {fmt(e.amount)}
                  </span>
                  <button onClick={()=>delExpense(e.id)}
                    style={{background:'rgba(248,113,113,0.1)',border:'1px solid rgba(248,113,113,0.2)',
                      borderRadius:6,padding:'3px 8px',color:'#f87171',fontFamily:'monospace',fontSize:10,cursor:'pointer',flexShrink:0}}>
                    ✕
                  </button>
                </div>
              ))
            }
            {data?.expenses?.length > 0 && (
              <div style={{display:'flex',justifyContent:'flex-end',paddingTop:10}}>
                <span style={{color:'#f87171',fontFamily:"'Space Mono',monospace",fontSize:14,fontWeight:700}}>
                  Σ {fmt(data.totalExpenses)}
                </span>
              </div>
            )}
          </div>
        </>
      )}

      {/* ══ EINNAHMEN ══ */}
      {tab==='revenue' && data && (
        <div style={S.card}>
          <div style={S.head}>
            IM ZEITRAUM BEZAHLTE AUFTRÄGE ({data.paidOrders?.length||0}) · {fmt(data.totalRevenue)} EINGENOMMEN
          </div>
          {!data.paidOrders?.length
            ? <div style={{color:'rgba(255,255,255,0.3)',fontFamily:'monospace',fontSize:12}}>
                Keine bezahlten Aufträge im gewählten Zeitraum.
              </div>
            : data.paidOrders.map(o => (
              <div key={o.id} style={{display:'flex',alignItems:'center',gap:10,padding:'8px 0',
                borderBottom:'1px solid rgba(255,255,255,0.05)',flexWrap:'wrap'}}>
                <span style={{color:'rgba(255,255,255,0.3)',fontFamily:'monospace',fontSize:10,flexShrink:0}}>
                  {o.bezahlt_am ? new Date(o.bezahlt_am).toLocaleDateString('de-DE') : '—'}
                </span>
                <span style={{color:'rgba(255,255,255,0.8)',fontFamily:'monospace',fontSize:12,flex:1}}>
                  {o.name}
                </span>
                <span style={{color:'rgba(255,255,255,0.3)',fontFamily:'monospace',fontSize:10,flexShrink:0}}>
                  Erstellt: {new Date(o.created_at).toLocaleDateString('de-DE')}
                </span>
                <div style={{display:'flex',gap:6,flexShrink:0}}>
                  <span style={{color:'#f87171',fontFamily:"'Space Mono',monospace",fontSize:11}}>
                    -{fmt(o.base_cost)}
                  </span>
                  <span style={{color:'#4ade80',fontFamily:"'Space Mono',monospace",fontSize:12,fontWeight:700}}>
                    {fmt(o.revenue)}
                  </span>
                </div>
              </div>
            ))
          }
          {data.paidOrders?.length > 0 && (
            <div style={{display:'flex',justifyContent:'space-between',paddingTop:10,
              borderTop:'1px solid rgba(255,255,255,0.07)'}}>
              <span style={{color:'rgba(255,255,255,0.4)',fontFamily:'monospace',fontSize:11}}>
                Materialkosten: {fmt(data.totalBaseCost)}
              </span>
              <span style={{color:'#60a5fa',fontFamily:"'Space Mono',monospace",fontSize:13,fontWeight:700}}>
                Rohgewinn: {fmt(data.totalProfit)}
              </span>
            </div>
          )}
        </div>
      )}

      {/* ══ BESTELLUNGEN (dieser Monat) ══ */}
      {tab==='orders' && (
        <OrdersInPeriod fromDate={fromDate} toDate={toDate}/>
      )}

      {/* ══ MAKERWORLD ══ */}
      {tab==='makerworld' && (
        <MakerworldTab toast={toast}/>
      )}
    </div>
  );
}