// Configuração de horários de funcionamento (clínica) + feriados/fechamentos e
// horários dos dentistas. Consome /api/nw/agenda-config (o backend garante o
// ownership: horário/feriado da clínica = dono; horário do dentista = ele ou dono).
import React, { useState, useEffect, useCallback } from 'react';
import { X, Clock, CalendarOff, Plus, Trash2, Save, Loader2, User } from 'lucide-react';

const API = (import.meta as any).env?.VITE_API_URL || '/api';
const BASE = `${API}/nw/agenda-config`;
const DIAS = ['Domingo', 'Segunda', 'Terça', 'Quarta', 'Quinta', 'Sexta', 'Sábado'];

async function req(path: string, opts: RequestInit = {}) {
  const token = localStorage.getItem('SCOREODONTO_AUTH_TOKEN');
  const res = await fetch(`${BASE}${path}`, {
    ...opts,
    headers: { 'Content-Type': 'application/json', ...(token ? { Authorization: `Bearer ${token}` } : {}), ...(opts.headers || {}) },
  });
  const txt = await res.text();
  const data = txt ? JSON.parse(txt) : {};
  if (!res.ok) throw new Error(data.error || `Erro ${res.status}`);
  return data;
}

interface Faixa { dia_semana: number; hora_inicio: string; hora_fim: string }
interface Dentista { id: string; nome: string; usuario_id: string | null; eh_voce: boolean }

// Editor de grade semanal (7 dias, cada um com 0..n faixas). Reusado p/ clínica e dentista.
const GradeSemanal: React.FC<{ faixas: Faixa[]; onChange: (f: Faixa[]) => void; disabled?: boolean }> = ({ faixas, onChange, disabled }) => {
  const porDia = (d: number) => faixas.filter((f) => f.dia_semana === d);
  const setDia = (d: number, novas: Faixa[]) => onChange([...faixas.filter((f) => f.dia_semana !== d), ...novas]);
  return (
    <div className="space-y-2">
      {DIAS.map((nome, d) => {
        const fs = porDia(d);
        return (
          <div key={d} className="flex items-start gap-3 py-2 border-b border-gray-50">
            <div className="w-24 shrink-0 pt-2 text-xs font-black text-gray-700 uppercase tracking-tight">{nome}</div>
            <div className="flex-1 space-y-2">
              {fs.length === 0 && <span className="text-[11px] text-gray-400 italic">Fechado</span>}
              {fs.map((f, i) => (
                <div key={i} className="flex items-center gap-2">
                  <input type="time" disabled={disabled} value={f.hora_inicio}
                    onChange={(e) => { const n = [...fs]; n[i] = { ...f, hora_inicio: e.target.value }; setDia(d, n); }}
                    className="bg-gray-50 border-2 border-transparent focus:border-teal-600 rounded-xl px-2 py-1.5 text-sm font-bold text-gray-800 outline-none" />
                  <span className="text-gray-400 text-xs font-bold">até</span>
                  <input type="time" disabled={disabled} value={f.hora_fim}
                    onChange={(e) => { const n = [...fs]; n[i] = { ...f, hora_fim: e.target.value }; setDia(d, n); }}
                    className="bg-gray-50 border-2 border-transparent focus:border-teal-600 rounded-xl px-2 py-1.5 text-sm font-bold text-gray-800 outline-none" />
                  {!disabled && <button onClick={() => setDia(d, fs.filter((_, j) => j !== i))} className="text-gray-300 hover:text-red-500 p-1"><Trash2 size={15} /></button>}
                </div>
              ))}
              {!disabled && (
                <button onClick={() => setDia(d, [...fs, { dia_semana: d, hora_inicio: '08:00', hora_fim: '18:00' }])}
                  className="text-[11px] font-black text-teal-600 hover:text-teal-800 uppercase tracking-wide flex items-center gap-1">
                  <Plus size={13} /> {fs.length ? 'Outra faixa' : 'Abrir neste dia'}
                </button>
              )}
            </div>
          </div>
        );
      })}
    </div>
  );
};

export const HorariosConfig: React.FC<{ isOpen: boolean; onClose: () => void; clinicaId?: string; initialTab?: 'clinica' | 'dentistas'; soDentista?: boolean }> = ({ isOpen, onClose, clinicaId, initialTab, soDentista }) => {
  const [aba, setAba] = useState<'clinica' | 'dentistas'>(initialTab || 'clinica');
  useEffect(() => { if (isOpen && initialTab) setAba(initialTab); }, [isOpen, initialTab]);
  const [erro, setErro] = useState<string | null>(null);
  const [ok, setOk] = useState<string | null>(null);
  const [saving, setSaving] = useState(false);

  // Clínica
  const [clinFaixas, setClinFaixas] = useState<Faixa[]>([]);
  const [feriados, setFeriados] = useState<{ excecoes: any[]; nacionais: any[] }>({ excecoes: [], nacionais: [] });
  const [novo, setNovo] = useState({ data: '', nome: '', fecha: true });

  // Dentistas
  const [dentistas, setDentistas] = useState<Dentista[]>([]);
  const [dentSel, setDentSel] = useState<string>('');
  const [dentFaixas, setDentFaixas] = useState<Faixa[]>([]);
  const [folgas, setFolgas] = useState<any[]>([]);
  const [novaFolga, setNovaFolga] = useState({ data_inicio: '', data_fim: '', motivo: '' });

  const flash = (setter: (v: string | null) => void, msg: string) => { setter(msg); setTimeout(() => setter(null), 3000); };

  const carregarClinica = useCallback(async () => {
    if (!clinicaId) return;
    try {
      const h = await req(`/clinica/${clinicaId}/horarios`);
      setClinFaixas((h.horarios || []).map((r: any) => ({ dia_semana: r.dia_semana, hora_inicio: r.hora_inicio, hora_fim: r.hora_fim })));
      const f = await req(`/clinica/${clinicaId}/feriados?ano=${new Date().getFullYear()}`);
      setFeriados({ excecoes: f.excecoes || [], nacionais: f.nacionais || [] });
    } catch (e: any) { flash(setErro, e.message); }
  }, [clinicaId]);

  const carregarDentistas = useCallback(async () => {
    if (!clinicaId) return;
    try {
      const d = await req(`/clinica/${clinicaId}/dentistas`);
      let list: Dentista[] = d.dentistas || [];
      if (soDentista) { const meus = list.filter((x) => x.eh_voce); if (meus.length) list = meus; } // dentista só vê o próprio
      setDentistas(list);
      const first = list.find((x: Dentista) => x.eh_voce) || list[0];
      if (first) setDentSel(first.id);
    } catch (e: any) { flash(setErro, e.message); }
  }, [clinicaId, soDentista]);

  useEffect(() => { if (isOpen) { carregarClinica(); carregarDentistas(); } }, [isOpen, carregarClinica, carregarDentistas]);
  const carregarFolgas = useCallback((id: string) => {
    req(`/dentista/${id}/folgas`).then((f) => setFolgas(f.folgas || [])).catch(() => setFolgas([]));
  }, []);
  useEffect(() => {
    if (!dentSel) { setDentFaixas([]); setFolgas([]); return; }
    req(`/dentista/${dentSel}/horarios`).then((h) =>
      setDentFaixas((h.horarios || []).map((r: any) => ({ dia_semana: r.dia_semana, hora_inicio: r.hora_inicio, hora_fim: r.hora_fim })))
    ).catch((e) => flash(setErro, e.message));
    carregarFolgas(dentSel);
  }, [dentSel, carregarFolgas]);

  const addFolga = async () => {
    if (!novaFolga.data_inicio) { flash(setErro, 'Informe a data.'); return; }
    try { await req(`/dentista/${dentSel}/folgas`, { method: 'POST', body: JSON.stringify(novaFolga) }); setNovaFolga({ data_inicio: '', data_fim: '', motivo: '' }); carregarFolgas(dentSel); flash(setOk, 'Folga adicionada!'); }
    catch (e: any) { flash(setErro, e.message); }
  };
  const delFolga = async (id: string) => {
    try { await req(`/dentista/${dentSel}/folgas/${id}`, { method: 'DELETE' }); carregarFolgas(dentSel); } catch (e: any) { flash(setErro, e.message); }
  };

  const salvarClinica = async () => {
    setSaving(true); setErro(null);
    try { await req(`/clinica/${clinicaId}/horarios`, { method: 'PUT', body: JSON.stringify({ horarios: clinFaixas }) }); flash(setOk, 'Horário da clínica salvo!'); }
    catch (e: any) { flash(setErro, e.message); } finally { setSaving(false); }
  };
  const salvarDentista = async () => {
    setSaving(true); setErro(null);
    try { await req(`/dentista/${dentSel}/horarios`, { method: 'PUT', body: JSON.stringify({ horarios: dentFaixas }) }); flash(setOk, 'Horário do dentista salvo!'); }
    catch (e: any) { flash(setErro, e.message); } finally { setSaving(false); }
  };
  const addFeriado = async () => {
    if (!novo.data || !novo.nome) { flash(setErro, 'Informe data e nome.'); return; }
    try { await req(`/clinica/${clinicaId}/feriados`, { method: 'POST', body: JSON.stringify(novo) }); setNovo({ data: '', nome: '', fecha: true }); carregarClinica(); flash(setOk, 'Fechamento adicionado!'); }
    catch (e: any) { flash(setErro, e.message); }
  };
  const delFeriado = async (id: string) => {
    try { await req(`/clinica/${clinicaId}/feriados/${id}`, { method: 'DELETE' }); carregarClinica(); }
    catch (e: any) { flash(setErro, e.message); }
  };

  if (!isOpen) return null;

  return (
    <div className="fixed inset-0 bg-black/60 z-[70] flex items-center justify-center backdrop-blur-md p-0">
      <div className="bg-white shadow-2xl w-full h-dvh md:w-[92vw] md:max-w-4xl md:h-[94vh] rounded-none md:rounded-[2rem] flex flex-col overflow-hidden border border-gray-100">
        {/* Header */}
        <div className="px-8 py-6 border-b border-gray-50 flex justify-between items-center bg-gradient-to-br from-gray-50 to-white">
          <div className="flex items-center gap-3">
            <div className="p-2.5 bg-teal-600 rounded-2xl shadow-lg shadow-teal-200"><Clock size={22} className="text-white" /></div>
            <div>
              <h2 className="text-lg font-black text-gray-900 uppercase tracking-tighter">Horários de Funcionamento</h2>
              <p className="text-[10px] font-bold text-gray-400 uppercase tracking-widest mt-0.5">A Secretária IA usa isto para atender</p>
            </div>
          </div>
          <button onClick={onClose} className="p-2 hover:bg-gray-100 rounded-xl text-gray-400"><X size={22} /></button>
        </div>

        {/* Tabs */}
        <div className="flex gap-1 px-8 pt-4 border-b border-gray-50">
          {(soDentista ? (['dentistas'] as const) : (['clinica', 'dentistas'] as const)).map((t) => (
            <button key={t} onClick={() => setAba(t)}
              className={`px-4 py-2.5 text-xs font-black uppercase tracking-wide rounded-t-xl transition-colors ${aba === t ? 'bg-teal-600 text-white' : 'text-gray-400 hover:text-gray-600'}`}>
              {t === 'clinica' ? 'Clínica' : 'Dentistas'}
            </button>
          ))}
        </div>

        {(erro || ok) && (
          <div className={`px-8 py-2 text-xs font-bold ${erro ? 'bg-red-50 text-red-600' : 'bg-green-50 text-green-600'}`}>{erro || ok}</div>
        )}

        <div className="flex-1 overflow-y-auto p-8">
          {aba === 'clinica' ? (
            <div className="space-y-10">
              <section>
                <div className="flex items-center justify-between mb-4">
                  <h3 className="text-sm font-black text-gray-800 uppercase tracking-tight flex items-center gap-2"><Clock size={16} className="text-teal-600" /> Dias e horários que a clínica funciona</h3>
                  <button onClick={salvarClinica} disabled={saving} className="bg-teal-600 hover:bg-teal-700 text-white text-xs font-black uppercase tracking-wide px-4 py-2 rounded-xl flex items-center gap-2 disabled:opacity-50">
                    {saving ? <Loader2 size={14} className="animate-spin" /> : <Save size={14} />} Salvar
                  </button>
                </div>
                <GradeSemanal faixas={clinFaixas} onChange={setClinFaixas} />
                <p className="text-[11px] text-gray-400 italic mt-3">Sem horário configurado, assume-se seg–sex 08h–18h. Só o dono edita.</p>
              </section>

              <section>
                <h3 className="text-sm font-black text-gray-800 uppercase tracking-tight flex items-center gap-2 mb-4"><CalendarOff size={16} className="text-teal-600" /> Feriados e fechamentos</h3>
                <div className="flex flex-wrap items-end gap-2 mb-4 bg-gray-50 p-4 rounded-2xl">
                  <div><label className="text-[9px] font-black text-gray-400 uppercase block mb-1">Data</label>
                    <input type="date" value={novo.data} onChange={(e) => setNovo({ ...novo, data: e.target.value })} className="bg-white border-2 border-transparent focus:border-teal-600 rounded-xl px-3 py-2 text-sm font-bold outline-none" /></div>
                  <div className="flex-1 min-w-[160px]"><label className="text-[9px] font-black text-gray-400 uppercase block mb-1">Motivo</label>
                    <input type="text" placeholder="Ex: Recesso, ponte" value={novo.nome} onChange={(e) => setNovo({ ...novo, nome: e.target.value })} className="w-full bg-white border-2 border-transparent focus:border-teal-600 rounded-xl px-3 py-2 text-sm font-bold outline-none" /></div>
                  <button onClick={addFeriado} className="bg-gray-900 hover:bg-black text-white text-xs font-black uppercase px-4 py-2.5 rounded-xl flex items-center gap-1"><Plus size={14} /> Adicionar</button>
                </div>
                {feriados.excecoes.length > 0 && (
                  <div className="space-y-1 mb-4">
                    {feriados.excecoes.map((f) => (
                      <div key={f.id} className="flex items-center justify-between bg-red-50 rounded-xl px-3 py-2">
                        <span className="text-xs font-bold text-red-700">{f.data.split('-').reverse().join('/')} · {f.nome}</span>
                        <button onClick={() => delFeriado(f.id)} className="text-red-300 hover:text-red-600"><Trash2 size={15} /></button>
                      </div>
                    ))}
                  </div>
                )}
                <details className="text-xs">
                  <summary className="cursor-pointer font-black text-gray-400 uppercase tracking-wide">Feriados nacionais (automáticos)</summary>
                  <div className="mt-2 grid grid-cols-2 gap-1">
                    {feriados.nacionais.map((f) => <div key={f.data} className="text-[11px] text-gray-500">{f.data.split('-').reverse().join('/')} · {f.nome}</div>)}
                  </div>
                </details>
              </section>
            </div>
          ) : (
            <div className="space-y-5">
              <div className="flex items-center justify-between">
                <div className="flex items-center gap-2">
                  <User size={16} className="text-teal-600" />
                  <select value={dentSel} onChange={(e) => setDentSel(e.target.value)} className="bg-gray-50 border-2 border-transparent focus:border-teal-600 rounded-xl px-3 py-2 text-sm font-black text-gray-800 outline-none">
                    {dentistas.map((d) => <option key={d.id} value={d.id}>{d.nome}{d.eh_voce ? ' (você)' : ''}</option>)}
                  </select>
                </div>
                <button onClick={salvarDentista} disabled={saving || !dentSel} className="bg-teal-600 hover:bg-teal-700 text-white text-xs font-black uppercase tracking-wide px-4 py-2 rounded-xl flex items-center gap-2 disabled:opacity-50">
                  {saving ? <Loader2 size={14} className="animate-spin" /> : <Save size={14} />} Salvar
                </button>
              </div>
              {dentSel ? <GradeSemanal faixas={dentFaixas} onChange={setDentFaixas} /> : <p className="text-xs text-gray-400">Nenhum dentista.</p>}
              <p className="text-[11px] text-gray-400 italic">Sem horário próprio, o dentista atende sempre que a clínica está aberta. Cada dentista (ou o dono) edita os seus.</p>

              {dentSel && (
                <section className="pt-4 border-t border-gray-100">
                  <h3 className="text-sm font-black text-gray-800 uppercase tracking-tight flex items-center gap-2 mb-3"><CalendarOff size={16} className="text-teal-600" /> Folgas e férias (não atende nestas datas)</h3>
                  <div className="flex flex-wrap items-end gap-2 mb-3 bg-gray-50 p-4 rounded-2xl">
                    <div><label className="text-[9px] font-black text-gray-400 uppercase block mb-1">De</label>
                      <input type="date" value={novaFolga.data_inicio} onChange={(e) => setNovaFolga({ ...novaFolga, data_inicio: e.target.value })} className="bg-white border-2 border-transparent focus:border-teal-600 rounded-xl px-3 py-2 text-sm font-bold outline-none" /></div>
                    <div><label className="text-[9px] font-black text-gray-400 uppercase block mb-1">Até (opcional)</label>
                      <input type="date" value={novaFolga.data_fim} onChange={(e) => setNovaFolga({ ...novaFolga, data_fim: e.target.value })} className="bg-white border-2 border-transparent focus:border-teal-600 rounded-xl px-3 py-2 text-sm font-bold outline-none" /></div>
                    <div className="flex-1 min-w-[140px]"><label className="text-[9px] font-black text-gray-400 uppercase block mb-1">Motivo</label>
                      <input type="text" placeholder="Ex: Férias, congresso" value={novaFolga.motivo} onChange={(e) => setNovaFolga({ ...novaFolga, motivo: e.target.value })} className="w-full bg-white border-2 border-transparent focus:border-teal-600 rounded-xl px-3 py-2 text-sm font-bold outline-none" /></div>
                    <button onClick={addFolga} className="bg-gray-900 hover:bg-black text-white text-xs font-black uppercase px-4 py-2.5 rounded-xl flex items-center gap-1"><Plus size={14} /> Adicionar</button>
                  </div>
                  {folgas.length > 0 ? (
                    <div className="space-y-1">
                      {folgas.map((f) => (
                        <div key={f.id} className="flex items-center justify-between bg-amber-50 rounded-xl px-3 py-2">
                          <span className="text-xs font-bold text-amber-700">
                            {f.data_inicio.split('-').reverse().join('/')}{f.data_fim !== f.data_inicio ? ` até ${f.data_fim.split('-').reverse().join('/')}` : ''}{f.motivo ? ` · ${f.motivo}` : ''}
                          </span>
                          <button onClick={() => delFolga(f.id)} className="text-amber-300 hover:text-amber-600"><Trash2 size={15} /></button>
                        </div>
                      ))}
                    </div>
                  ) : <p className="text-[11px] text-gray-400 italic">Nenhuma folga futura cadastrada.</p>}
                </section>
              )}
            </div>
          )}
        </div>
      </div>
    </div>
  );
};