// Liga/desliga a Secretária IA APENAS desta sessão (instância aberta no /wa-inbox).
// Rate-limit 1x/hora, motivo obrigatório ao desligar, histórico de quem apertou.
// Fica na thin sidebar; abre um modal com o textarea de motivo + histórico.
import React, { useState, useEffect, useCallback } from 'react';
import { Power, X, Loader2, History, AlertTriangle } from 'lucide-react';
import { secSessionPowerApi, SessionPower } from '../services/secretariaApi';

const userName = (() => {
  try { return JSON.parse(localStorage.getItem('SCOREODONTO_USER_DATA') || '{}')?.nome || 'Usuário'; }
  catch { return 'Usuário'; }
})();

const fmt = (iso?: string | null) => {
  if (!iso) return '';
  try { return new Date(iso).toLocaleString('pt-BR', { day: '2-digit', month: '2-digit', hour: '2-digit', minute: '2-digit' }); }
  catch { return ''; }
};

export const SessaoSecretariaPower: React.FC<{ instanceId: string | null }> = ({ instanceId }) => {
  const [sp, setSp] = useState<SessionPower | null>(null);
  const [open, setOpen] = useState(false);
  const [reason, setReason] = useState('');
  const [busy, setBusy] = useState(false);
  const [erro, setErro] = useState<string | null>(null);

  const carregar = useCallback(async () => {
    if (!instanceId) return;
    try { setSp(await secSessionPowerApi.get(instanceId)); } catch { /* silencioso */ }
  }, [instanceId]);

  useEffect(() => { carregar(); }, [carregar]);

  if (!instanceId) return null;
  const enabled = sp ? sp.enabled : true;

  const toggle = async () => {
    if (!sp?.can_toggle) return;
    const proximo = !enabled;
    if (proximo === false && !reason.trim()) { setErro('Escreva o motivo para desligar.'); return; }
    setBusy(true); setErro(null);
    try {
      await secSessionPowerApi.set(instanceId, proximo, reason.trim(), userName);
      setReason('');
      await carregar();
    } catch (e: any) {
      setErro(e?.message || 'Não foi possível alterar.');
      await carregar();
    } finally { setBusy(false); }
  };

  return (
    <>
      <button
        title={enabled ? 'Secretária IA ligada nesta sessão — clique para gerenciar' : 'Secretária IA DESLIGADA nesta sessão'}
        onClick={() => { setErro(null); setOpen(true); }}
        className={`w-10 h-10 mb-2 rounded-full flex items-center justify-center transition-colors ${
          enabled ? 'text-emerald-600 hover:bg-[#d9dbdf]/60' : 'text-white bg-red-600 hover:bg-red-700 animate-pulse'
        }`}
      >
        <Power className="w-5 h-5" />
      </button>

      {open && (
        <div className="fixed inset-0 bg-black/60 z-[80] flex items-center justify-center backdrop-blur-md p-4" onClick={() => setOpen(false)}>
          <div className="bg-white w-full max-w-md rounded-[1.5rem] shadow-2xl border border-gray-100 flex flex-col max-h-[90vh] overflow-hidden" onClick={(e) => e.stopPropagation()}>
            <div className="px-6 py-5 border-b border-gray-50 flex items-center justify-between bg-gradient-to-br from-gray-50 to-white">
              <div className="flex items-center gap-3">
                <div className={`p-2 rounded-xl ${enabled ? 'bg-emerald-500' : 'bg-red-600'} shadow`}><Power size={18} className="text-white" /></div>
                <div>
                  <h2 className="text-base font-black text-gray-900 uppercase tracking-tighter leading-none">Secretária desta sessão</h2>
                  <p className="text-[10px] font-bold text-gray-400 uppercase tracking-widest mt-1">{enabled ? 'Ligada' : 'Desligada'} · só este número</p>
                </div>
              </div>
              <button onClick={() => setOpen(false)} className="p-2 hover:bg-gray-100 rounded-xl text-gray-400"><X size={20} /></button>
            </div>

            {erro && <div className="px-6 py-2 text-xs font-bold bg-red-50 text-red-600">{erro}</div>}

            <div className="p-6 space-y-4 overflow-y-auto">
              {!enabled && sp?.reason && (
                <div className="text-xs bg-red-50 text-red-700 rounded-xl p-3">
                  <span className="font-black">Desligada.</span> Motivo: {sp.reason}
                  {sp.changed_by && <div className="text-red-400 mt-1">por {sp.changed_by} · {fmt(sp.changed_at)}</div>}
                </div>
              )}

              {/* Motivo (só ao desligar) */}
              {enabled && (
                <div>
                  <label className="text-[10px] font-black text-gray-400 uppercase tracking-widest block mb-1.5">Motivo para desligar</label>
                  <textarea value={reason} onChange={(e) => setReason(e.target.value)} rows={3}
                    placeholder="Ex.: revisando as respostas da IA; horário de pico; treinamento…"
                    className="w-full bg-gray-50 border-2 border-transparent focus:border-red-500 rounded-xl px-3 py-2 text-sm outline-none resize-y" />
                </div>
              )}

              {/* Rate-limit */}
              {!sp?.can_toggle && (
                <p className="text-[11px] text-amber-600 font-bold flex items-center gap-1.5"><AlertTriangle size={13} /> Só é possível alternar 1x por hora. Disponível às {fmt(sp?.next_toggle_at)}.</p>
              )}

              <button onClick={toggle} disabled={busy || !sp?.can_toggle}
                className={`w-full py-2.5 rounded-xl text-sm font-black uppercase tracking-wide flex items-center justify-center gap-2 disabled:opacity-40 ${
                  enabled ? 'bg-red-600 hover:bg-red-700 text-white' : 'bg-emerald-600 hover:bg-emerald-700 text-white'
                }`}>
                {busy ? <Loader2 size={16} className="animate-spin" /> : <Power size={16} />}
                {enabled ? 'Desligar nesta sessão' : 'Ligar nesta sessão'}
              </button>

              {/* Histórico */}
              {!!sp?.history?.length && (
                <div>
                  <p className="text-[10px] font-black text-gray-400 uppercase tracking-widest flex items-center gap-1.5 mb-2"><History size={12} /> Histórico</p>
                  <div className="space-y-1.5 max-h-40 overflow-y-auto">
                    {sp.history.map((h, i) => (
                      <div key={i} className="text-[11px] flex items-start gap-2">
                        <span className={`mt-1 w-1.5 h-1.5 rounded-full shrink-0 ${h.enabled ? 'bg-emerald-500' : 'bg-red-500'}`} />
                        <div className="min-w-0">
                          <span className="font-bold text-gray-700">{h.enabled ? 'Ligou' : 'Desligou'}</span>
                          <span className="text-gray-400"> · {h.by || '—'} · {fmt(h.at)}</span>
                          {!h.enabled && h.reason && <div className="text-gray-500 leading-snug">{h.reason}</div>}
                        </div>
                      </div>
                    ))}
                  </div>
                </div>
              )}
            </div>
          </div>
        </div>
      )}
    </>
  );
};