import { useCallback, useEffect, useState } from 'react';
import {
  Activity, AlertTriangle, CheckCircle2, Clock, ExternalLink,
  Loader2, RefreshCw, Search, ShieldCheck, Sparkles,
} from 'lucide-react';
import toast from 'react-hot-toast';
import {
  getFirmPulse,
  getGrantPulse,
  PulseItem,
  PulseKind,
  PulseResponse,
} from '../api/client';

const KINDS: { id: PulseKind; label: string; hint: string; color: string }[] = [
  { id: 'current', label: 'Aktualne', hint: 'Otwarte nabory', color: '#34d399' },
  { id: 'new', label: 'Nowe', hint: 'Ostatnio w katalogu', color: '#60a5fa' },
  { id: 'closing', label: 'Zamykające się', hint: 'Termin wkrótce', color: '#f87171' },
  { id: 'planned', label: 'Planowane', hint: 'Zapowiedziane', color: '#a78bfa' },
  { id: 'all', label: 'Wszystkie', hint: 'Pełny puls', color: '#94a3b8' },
];

const FlagPill: React.FC<{ ok?: boolean; label: string }> = ({ ok, label }) => (
  <span
    style={{
      display: 'inline-flex',
      alignItems: 'center',
      gap: 4,
      fontSize: '0.65rem',
      fontWeight: 700,
      padding: '2px 8px',
      borderRadius: 6,
      border: `1px solid ${ok ? '#10b98155' : '#f59e0b55'}`,
      background: ok ? '#10b98118' : '#f59e0b18',
      color: ok ? '#34d399' : '#fbbf24',
    }}
  >
    {ok ? <CheckCircle2 size={11} /> : <AlertTriangle size={11} />}
    {label}
  </span>
);

const PulseCard: React.FC<{ item: PulseItem; showMatch?: boolean }> = ({ item, showMatch }) => {
  const v = item.verification || {};
  const daysLeft = (() => {
    if (!item.deadline) return null;
    const t = new Date(item.deadline).getTime();
    if (Number.isNaN(t)) return null;
    return Math.ceil((t - Date.now()) / 86400000);
  })();

  return (
    <div
      className="glass-card"
      style={{
        padding: '1.25rem',
        border: '1px solid var(--border-subtle)',
        borderRadius: 14,
        display: 'flex',
        flexDirection: 'column',
        gap: '0.75rem',
      }}
    >
      <div style={{ display: 'flex', justifyContent: 'space-between', gap: '0.75rem', flexWrap: 'wrap' }}>
        <div style={{ flex: 1, minWidth: 0 }}>
          <div style={{ display: 'flex', gap: 6, flexWrap: 'wrap', marginBottom: 8 }}>
            {(item.pulse_kinds || []).map((k) => (
              <span
                key={k}
                style={{
                  fontSize: '0.65rem',
                  fontWeight: 700,
                  textTransform: 'uppercase',
                  letterSpacing: '0.04em',
                  padding: '2px 8px',
                  borderRadius: 6,
                  background: 'var(--bg-surface)',
                  border: '1px solid var(--border-subtle)',
                  color: 'var(--text-muted)',
                }}
              >
                {k}
              </span>
            ))}
            {item.alert_worthy && (
              <span style={{ fontSize: '0.65rem', fontWeight: 800, color: '#10b981' }}>
                ALERT-READY
              </span>
            )}
          </div>
          <h3 style={{ margin: 0, fontSize: '0.95rem', fontWeight: 700, color: 'var(--text-primary)', lineHeight: 1.4 }}>
            {item.name || 'Bez nazwy'}
          </h3>
          <div style={{ fontSize: '0.75rem', color: 'var(--text-muted)', marginTop: 4 }}>
            {item.operator || item.source || '—'}
            {item.status ? ` · ${item.status}` : ''}
          </div>
        </div>
        <div style={{ textAlign: 'right', flexShrink: 0 }}>
          {showMatch && typeof item.match_score === 'number' && (
            <div style={{ fontSize: '1.1rem', fontWeight: 800, color: 'var(--accent-green)' }}>
              {item.match_score}%
            </div>
          )}
          {daysLeft !== null && (
            <div
              style={{
                fontSize: '0.75rem',
                fontWeight: 700,
                color: daysLeft < 14 ? '#f87171' : daysLeft < 45 ? '#fbbf24' : '#34d399',
              }}
            >
              {daysLeft > 0 ? `${daysLeft} dni` : item.continuous ? 'ciągły' : 'termin minął'}
            </div>
          )}
          {item.deadline ? (
            <div style={{ fontSize: '0.7rem', color: 'var(--text-muted)' }}>do {item.deadline}</div>
          ) : (
            <div style={{ fontSize: '0.7rem', color: 'var(--text-muted)' }}>
              {item.continuous ? 'nabór ciągły' : 'brak terminu (uczciwie puste)'}
            </div>
          )}
        </div>
      </div>

      <div style={{ display: 'flex', gap: 6, flexWrap: 'wrap' }}>
        <FlagPill ok={v.deadline_verified} label="termin" />
        <FlagPill ok={v.status_verified} label="status" />
        <FlagPill ok={v.regulation_verified} label="regulamin" />
        <FlagPill ok={v.credibility_ok} label="wiarygodność" />
      </div>

      {item.why_it_fits && (
        <p style={{ margin: 0, fontSize: '0.8rem', color: 'var(--text-secondary)', lineHeight: 1.45 }}>
          {item.why_it_fits}
        </p>
      )}

      {!!item.generation_blockers?.length && (
        <ul style={{ margin: 0, paddingLeft: '1.1rem', fontSize: '0.75rem', color: '#fbbf24' }}>
          {item.generation_blockers.slice(0, 3).map((b) => (
            <li key={b}>{b}</li>
          ))}
        </ul>
      )}

      <div style={{ display: 'flex', gap: 10, flexWrap: 'wrap' }}>
        {item.url && (
          <a
            href={item.url}
            target="_blank"
            rel="noreferrer"
            style={{ display: 'inline-flex', alignItems: 'center', gap: 4, fontSize: '0.75rem', color: 'var(--accent-blue)' }}
          >
            Strona naboru <ExternalLink size={12} />
          </a>
        )}
        {item.regulation_url && (
          <a
            href={item.regulation_url}
            target="_blank"
            rel="noreferrer"
            style={{ display: 'inline-flex', alignItems: 'center', gap: 4, fontSize: '0.75rem', color: '#a78bfa' }}
          >
            <ShieldCheck size={12} /> Regulamin
          </a>
        )}
      </div>
    </div>
  );
};

export default function Pulse() {
  const [kind, setKind] = useState<PulseKind>('current');
  const [data, setData] = useState<PulseResponse | null>(null);
  const [loading, setLoading] = useState(true);
  const [nip, setNip] = useState('');
  const [description, setDescription] = useState('');
  const [firmMode, setFirmMode] = useState(false);
  const [firmLoading, setFirmLoading] = useState(false);
  const [firmData, setFirmData] = useState<(PulseResponse & { gaps?: string[]; company?: Record<string, unknown>; alert_count?: number }) | null>(null);

  const loadPulse = useCallback(async (k: PulseKind) => {
    setLoading(true);
    try {
      const res = await getGrantPulse(k, 50);
      setData(res);
    } catch (e: unknown) {
      const status = (e as { response?: { status?: number } })?.response?.status;
      if (status === 401) {
        toast.error('Zaloguj się, aby zobaczyć Puls naborów.');
      } else {
        toast.error('Nie udało się pobrać Pulsu.');
      }
      setData(null);
    } finally {
      setLoading(false);
    }
  }, []);

  useEffect(() => {
    if (!firmMode) {
      void loadPulse(kind);
    }
  }, [kind, firmMode, loadPulse]);

  const runFirm = async () => {
    const cleanNip = nip.replace(/\D/g, '');
    if (cleanNip.length !== 10 && !description.trim()) {
      toast.error('Podaj NIP (10 cyfr) lub opis inwestycji.');
      return;
    }
    setFirmLoading(true);
    setFirmMode(true);
    try {
      const res = await getFirmPulse({
        nip: cleanNip || undefined,
        description: description.trim() || undefined,
        kind,
        limit: 20,
        min_score: 35,
      });
      setFirmData(res);
      toast.success(`Dopasowano ${res.count ?? 0} naborów`);
    } catch {
      toast.error('Firm Pulse niedostępny — sprawdź logowanie i NIP.');
      setFirmData(null);
    } finally {
      setFirmLoading(false);
    }
  };

  const items = firmMode ? firmData?.items || [] : data?.items || [];
  const counts = firmMode ? firmData?.counts : data?.counts;
  const quality = firmMode ? firmData?.quality : data?.quality;

  return (
    <div style={{ maxWidth: 1100, margin: '0 auto', padding: '1.5rem 1rem 3rem' }}>
      <header style={{ marginBottom: '1.5rem' }}>
        <div style={{ display: 'flex', alignItems: 'center', gap: 10, marginBottom: 8 }}>
          <Activity size={22} color="var(--accent-green)" />
          <h1 style={{ margin: 0, fontSize: '1.5rem', fontWeight: 800, color: 'var(--text-primary)' }}>
            Puls naborów
          </h1>
        </div>
        <p style={{ margin: 0, color: 'var(--text-muted)', fontSize: '0.9rem', maxWidth: 720, lineHeight: 1.5 }}>
          Ciągły podgląd katalogu: nowe, planowane, zamykające się i aktualne nabory z flagami
          weryfikacji (termin · status · regulamin). Dane z API — bez mocków.
        </p>
      </header>

      <div style={{ display: 'flex', gap: 8, flexWrap: 'wrap', marginBottom: '1rem' }}>
        {KINDS.map((k) => (
          <button
            key={k.id}
            type="button"
            onClick={() => {
              setKind(k.id);
              setFirmMode(false);
            }}
            className="btn"
            style={{
              background: kind === k.id && !firmMode ? `${k.color}22` : 'transparent',
              border: `1px solid ${kind === k.id && !firmMode ? k.color : 'var(--border-subtle)'}`,
              color: kind === k.id && !firmMode ? '#fff' : 'var(--text-secondary)',
              borderRadius: 10,
              padding: '0.55rem 0.9rem',
              fontWeight: 700,
              fontSize: '0.8rem',
            }}
          >
            {k.label}
            {counts && typeof counts[k.id] === 'number' ? ` (${counts[k.id]})` : ''}
          </button>
        ))}
        <button
          type="button"
          className="btn"
          onClick={() => (firmMode ? setFirmMode(false) : void loadPulse(kind))}
          style={{
            marginLeft: 'auto',
            display: 'inline-flex',
            alignItems: 'center',
            gap: 6,
            background: 'transparent',
            border: '1px solid var(--border-subtle)',
            color: 'var(--text-secondary)',
          }}
        >
          <RefreshCw size={14} /> Odśwież
        </button>
      </div>

      <div
        className="glass-card"
        style={{
          padding: '1rem 1.25rem',
          marginBottom: '1.25rem',
          borderRadius: 14,
          border: '1px solid var(--border-subtle)',
        }}
      >
        <div style={{ display: 'flex', alignItems: 'center', gap: 8, marginBottom: 10 }}>
          <Sparkles size={16} color="var(--accent-green)" />
          <strong style={{ color: 'var(--text-primary)', fontSize: '0.9rem' }}>
            Doradca firmowy (Firm Pulse)
          </strong>
        </div>
        <div style={{ display: 'flex', gap: 10, flexWrap: 'wrap' }}>
          <input
            value={nip}
            onChange={(e) => setNip(e.target.value)}
            placeholder="NIP (10 cyfr)"
            inputMode="numeric"
            style={{
              flex: '0 0 160px',
              padding: '0.65rem 0.8rem',
              borderRadius: 10,
              border: '1px solid var(--border-subtle)',
              background: 'var(--bg-base)',
              color: 'var(--text-primary)',
            }}
          />
          <input
            value={description}
            onChange={(e) => setDescription(e.target.value)}
            placeholder="Opis inwestycji / branża (opcjonalnie)"
            style={{
              flex: 1,
              minWidth: 200,
              padding: '0.65rem 0.8rem',
              borderRadius: 10,
              border: '1px solid var(--border-subtle)',
              background: 'var(--bg-base)',
              color: 'var(--text-primary)',
            }}
          />
          <button
            type="button"
            className="btn"
            onClick={() => void runFirm()}
            disabled={firmLoading}
            style={{
              display: 'inline-flex',
              alignItems: 'center',
              gap: 8,
              background: 'linear-gradient(90deg, var(--accent-green), #3b82f6)',
              color: '#000',
              fontWeight: 800,
              border: 'none',
              borderRadius: 10,
              padding: '0.65rem 1.1rem',
            }}
          >
            {firmLoading ? <Loader2 size={16} className="spin" /> : <Search size={16} />}
            Dopasuj
          </button>
        </div>
        {firmMode && firmData?.company && (
          <div style={{ marginTop: 10, fontSize: '0.8rem', color: 'var(--text-muted)' }}>
            Firma: {(firmData.company as { name?: string }).name || '—'} · NIP{' '}
            {(firmData.company as { nip?: string }).nip || nip || '—'}
            {typeof firmData.alert_count === 'number' ? ` · alert-ready: ${firmData.alert_count}` : ''}
            {!!firmData.gaps?.length && (
              <div style={{ color: '#fbbf24', marginTop: 4 }}>
                Luki rejestrów: {firmData.gaps.slice(0, 3).join(' · ')}
              </div>
            )}
          </div>
        )}
      </div>

      {quality && (
        <div
          style={{
            display: 'flex',
            gap: 12,
            flexWrap: 'wrap',
            marginBottom: '1rem',
            fontSize: '0.75rem',
            color: 'var(--text-muted)',
          }}
        >
          <span style={{ display: 'inline-flex', alignItems: 'center', gap: 4 }}>
            <Clock size={12} /> terminy: {Math.round((quality.deadline_rate || 0) * 100)}%
          </span>
          <span>regulaminy: {Math.round((quality.regulation_rate || 0) * 100)}%</span>
          {quality.deadline_backfilled ? (
            <span>backfill z tekstu: {quality.deadline_backfilled}</span>
          ) : null}
        </div>
      )}

      {(loading || firmLoading) && (
        <div style={{ padding: '3rem', textAlign: 'center', color: 'var(--text-muted)' }}>
          <Loader2 size={28} className="spin" style={{ marginBottom: 12 }} />
          <div>Ładowanie pulsu…</div>
        </div>
      )}

      {!loading && !firmLoading && items.length === 0 && (
        <div
          className="glass-card"
          style={{
            padding: '2rem',
            textAlign: 'center',
            color: 'var(--text-muted)',
            borderRadius: 14,
          }}
        >
          Brak pozycji dla wybranego rodzaju. Spróbuj „Aktualne” lub odśwież katalog naborów.
        </div>
      )}

      <div style={{ display: 'grid', gap: '0.9rem' }}>
        {items.map((it) => (
          <PulseCard key={String(it.id || it.name)} item={it} showMatch={firmMode} />
        ))}
      </div>
    </div>
  );
}