import React, { useState, useEffect } from 'react';
import { Plus, Search, FileText, Pencil, Printer, Trash2, Loader2, Zap, X, UserSearch } from 'lucide-react';
import { HybridBackend } from '../services/backend.ts';
import { Orcamento } from '../types.ts';
import { useHybridBackend } from '../hooks/useHybridBackend.ts';
import { useToast } from '../contexts/ToastContext.tsx';
import { useConfirm } from '../contexts/ConfirmContext.tsx';
import { PageHeader } from '../components/PageHeader.tsx';
import { OrcamentoModal, DEFAULT_CLAUSULAS } from './OrcamentoModal.tsx';

type StatusFilter = 'TODOS' | 'Ativo' | 'Rascunho' | 'Assinado' | 'Encerrado';

const STATUS_TABS: StatusFilter[] = ['TODOS', 'Ativo', 'Rascunho', 'Assinado', 'Encerrado'];

const STATUS_COLORS: Record<string, string> = {
  Ativo: 'bg-green-100 text-green-700',
  Rascunho: 'bg-amber-100 text-amber-700',
  Assinado: 'bg-blue-100 text-blue-700',
  Encerrado: 'bg-gray-100 text-gray-600',
};

const fmt = (v: number) => v.toLocaleString('pt-BR', { style: 'currency', currency: 'BRL' });

export const OrcamentosView: React.FC = () => {
  const toast = useToast();
  const confirm = useConfirm();
  const { data: contratos, isLoading, refresh } = useHybridBackend<Orcamento[]>(HybridBackend.getOrcamentos);
  const list = contratos ?? [];

  const [search, setSearch] = useState('');
  const [statusFilter, setStatusFilter] = useState<StatusFilter>('TODOS');
  const [modalOpen, setModalOpen] = useState(false);
  const [modalOrcamento, setModalOrcamento] = useState<Orcamento | null>(null);
  const [modalView, setModalView] = useState<'editor' | 'print'>('editor');

  // Gerar automático: escolher paciente → cria contrato com cláusulas padrão → abre a prévia.
  const [autoOpen, setAutoOpen] = useState(false);
  const [autoSearch, setAutoSearch] = useState('');
  const [autoPacientes, setAutoPacientes] = useState<{ id: string; nome: string }[]>([]);
  const [autoLoading, setAutoLoading] = useState(false);
  const [autoGerando, setAutoGerando] = useState(false);

  useEffect(() => {
    if (!autoOpen) return;
    let cancel = false;
    setAutoLoading(true);
    const t = setTimeout(async () => {
      try {
        const r = await HybridBackend.getPacientes(autoSearch);
        if (!cancel) setAutoPacientes((r?.data ?? []).map((p: any) => ({ id: p.id, nome: p.nome })));
      } catch { if (!cancel) setAutoPacientes([]); }
      finally { if (!cancel) setAutoLoading(false); }
    }, 300);
    return () => { cancel = true; clearTimeout(t); };
  }, [autoOpen, autoSearch]);

  const filtered = list.filter(c => {
    const matchSearch = !search.trim() ||
      c.pacienteNome.toLowerCase().includes(search.toLowerCase()) ||
      c.titulo.toLowerCase().includes(search.toLowerCase());
    const matchStatus = statusFilter === 'TODOS' || c.status === statusFilter;
    return matchSearch && matchStatus;
  });

  const stats = {
    total: list.length,
    ativos: list.filter(c => c.status === 'Ativo').length,
    rascunhos: list.filter(c => c.status === 'Rascunho').length,
    encerrados: list.filter(c => c.status === 'Encerrado' || c.status === 'Assinado').length,
  };

  const handleDelete = async (id: string, nome: string) => {
    if (!await confirm(`EXCLUIR o orçamento de ${nome}?`)) return;
    try {
      await HybridBackend.deleteOrcamento(id);
      toast.success('ORÇAMENTO EXCLUÍDO.');
      refresh();
    } catch {
      toast.error('ERRO AO EXCLUIR ORÇAMENTO.');
    }
  };

  const openNew = () => { setModalOrcamento(null); setModalView('editor'); setModalOpen(true); };
  const openEdit = (c: Orcamento) => { setModalOrcamento(c); setModalView('editor'); setModalOpen(true); };
  const openPrint = (c: Orcamento) => { setModalOrcamento(c); setModalView('print'); setModalOpen(true); };

  // Gera um contrato automaticamente para o paciente (cláusulas padrão) e abre a prévia.
  const gerarAuto = async (p: { id: string; nome: string }) => {
    setAutoGerando(true);
    try {
      const hoje = new Date().toISOString().split('T')[0];
      const res = await HybridBackend.saveOrcamento({
        titulo: 'CONTRATO DE SERVIÇOS ODONTOLÓGICOS',
        status: 'Rascunho',
        paciente_id: p.id,
        paciente_nome: p.nome,
        data_inicio: hoje,
        clausulas: DEFAULT_CLAUSULAS,
        items: [],
      } as any);
      const novo = {
        id: (res as any)?.id, titulo: 'CONTRATO DE SERVIÇOS ODONTOLÓGICOS', status: 'Rascunho',
        pacienteId: p.id, pacienteNome: p.nome, dataInicio: hoje, clausulas: DEFAULT_CLAUSULAS, items: [],
      } as unknown as Orcamento;
      toast.success('ORÇAMENTO GERADO! REVISE E IMPRIMA.');
      setAutoOpen(false); setAutoSearch('');
      refresh();
      setModalOrcamento(novo); setModalView('print'); setModalOpen(true);
    } catch {
      toast.error('ERRO AO GERAR ORÇAMENTO.');
    } finally { setAutoGerando(false); }
  };

  return (
    <div className="h-full flex flex-col">
      <PageHeader title="ORÇAMENTOS" description="Gestão de orçamentos de serviços odontológicos">
        <div className="flex items-center gap-2">
          <button
            onClick={() => { setAutoSearch(''); setAutoPacientes([]); setAutoOpen(true); }}
            title="Gerar orçamento automaticamente a partir de um paciente"
            className="bg-teal-600 hover:bg-teal-700 text-white px-4 py-2 rounded-lg flex items-center gap-2 transition-colors uppercase font-bold text-sm shadow-sm"
          >
            <Zap size={18} /> GERAR AUTOMÁTICO
          </button>
          <button
            onClick={openNew}
            className="bg-emerald-600 hover:bg-emerald-700 text-white px-4 py-2 rounded-lg flex items-center gap-2 transition-colors uppercase font-bold text-sm shadow-sm"
          >
            <Plus size={18} /> NOVO ORÇAMENTO
          </button>
        </div>
      </PageHeader>

      {/* Stats bar */}
      <div className="grid grid-cols-4 gap-3 mb-4">
        {[
          { label: 'Total', value: stats.total, color: 'bg-emerald-50 text-emerald-700' },
          { label: 'Ativos', value: stats.ativos, color: 'bg-green-50 text-green-700' },
          { label: 'Rascunhos', value: stats.rascunhos, color: 'bg-amber-50 text-amber-700' },
          { label: 'Encerrados/Assinados', value: stats.encerrados, color: 'bg-gray-50 text-gray-600' },
        ].map(s => (
          <div key={s.label} className={`${s.color} rounded-xl p-3 text-center`}>
            <p className="text-2xl font-black">{s.value}</p>
            <p className="text-[10px] font-bold uppercase opacity-70">{s.label}</p>
          </div>
        ))}
      </div>

      {/* Search + status filters */}
      <div className="flex flex-col sm:flex-row gap-3 mb-4">
        <div className="relative flex-1">
          <Search className="absolute left-3 top-1/2 -translate-y-1/2 text-gray-400 pointer-events-none" size={16} />
          <input
            type="text"
            placeholder="Buscar por paciente ou título..."
            className="w-full pl-9 pr-3 py-2 border border-gray-200 rounded-lg text-sm focus:ring-2 focus:ring-emerald-100 focus:border-emerald-300 outline-none bg-white"
            value={search}
            onChange={e => setSearch(e.target.value)}
          />
        </div>
        <div className="flex items-center gap-1 bg-gray-100 rounded-lg p-1 overflow-x-auto">
          {STATUS_TABS.map(s => (
            <button
              key={s}
              onClick={() => setStatusFilter(s)}
              className={`px-2.5 py-1 rounded-md text-[11px] font-bold transition-all whitespace-nowrap ${statusFilter === s ? 'bg-white text-gray-800 shadow-sm' : 'text-gray-500 hover:text-gray-700'}`}
            >
              {s}
            </button>
          ))}
        </div>
      </div>

      {/* Loading */}
      {isLoading && (
        <div className="flex-1 flex items-center justify-center">
          <Loader2 className="animate-spin text-emerald-400" size={32} />
        </div>
      )}

      {/* Empty state */}
      {!isLoading && filtered.length === 0 && (
        <div className="flex-1 flex flex-col items-center justify-center text-gray-400 py-20">
          <FileText size={48} className="mb-4 opacity-30" />
          <p className="text-sm font-bold uppercase">Nenhum orçamento encontrado</p>
          <p className="text-xs mt-1">{search || statusFilter !== 'TODOS' ? 'Tente limpar os filtros.' : 'Clique em "NOVO ORÇAMENTO" para começar.'}</p>
          {!search && statusFilter === 'TODOS' && (
            <button
              onClick={openNew}
              className="mt-4 flex items-center gap-2 px-4 py-2 bg-emerald-600 hover:bg-emerald-700 text-white rounded-lg text-sm font-bold transition-colors"
            >
              <Plus size={16} /> Criar Primeiro Orcamento
            </button>
          )}
        </div>
      )}

      {/* Grid */}
      {!isLoading && filtered.length > 0 && (
        <div className="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-3 gap-4 overflow-y-auto pb-6">
          {filtered.map(c => (
            <div key={c.id} className="bg-white rounded-xl border border-gray-200 shadow-sm hover:shadow-md transition-all duration-200 flex flex-col">
              <div className="p-4 flex-1">
                {/* Header row */}
                <div className="flex items-start justify-between gap-2 mb-2">
                  <h3 className="font-black text-gray-800 text-sm uppercase leading-tight flex-1">{c.pacienteNome}</h3>
                  <span className={`text-[9px] font-black px-2 py-0.5 rounded-full uppercase flex-shrink-0 ${STATUS_COLORS[c.status] || 'bg-gray-100 text-gray-600'}`}>
                    {c.status}
                  </span>
                </div>

                <p className="text-[11px] text-gray-500 font-medium uppercase truncate mb-2">{c.titulo}</p>

                <div className="flex flex-wrap gap-1 mb-3">
                  {c.especialidadeNome && (
                    <span className="bg-emerald-50 text-emerald-600 text-[9px] font-bold px-2 py-0.5 rounded-full uppercase">
                      {c.especialidadeNome}
                    </span>
                  )}
                  {c.dentistaNome && (
                    <span className="bg-gray-50 text-gray-500 text-[9px] font-bold px-2 py-0.5 rounded-full uppercase">
                      {c.dentistaNome}
                    </span>
                  )}
                </div>

                <div className="grid grid-cols-2 gap-2 text-[10px]">
                  <div>
                    <span className="text-gray-400 font-bold uppercase block">Valor Total</span>
                    <span className="font-black text-emerald-700 text-sm">{fmt(c.valorTotal)}</span>
                  </div>
                  <div>
                    <span className="text-gray-400 font-bold uppercase block">Itens</span>
                    <span className="font-bold text-gray-700">{c.items?.length ?? 0} proc.</span>
                  </div>
                  {c.dataInicio && (
                    <div>
                      <span className="text-gray-400 font-bold uppercase block">Início</span>
                      <span className="font-bold text-gray-700">
                        {new Date(c.dataInicio + 'T12:00').toLocaleDateString('pt-BR')}
                      </span>
                    </div>
                  )}
                  {c.dataFim && (
                    <div>
                      <span className="text-gray-400 font-bold uppercase block">Fim</span>
                      <span className="font-bold text-gray-700">
                        {new Date(c.dataFim + 'T12:00').toLocaleDateString('pt-BR')}
                      </span>
                    </div>
                  )}
                </div>
              </div>

              {/* Actions */}
              <div className="flex border-t border-gray-100">
                <button
                  onClick={() => openEdit(c)}
                  className="flex-1 flex items-center justify-center gap-1.5 py-2 text-emerald-600 hover:bg-emerald-50 rounded-bl-xl text-[10px] font-bold transition-colors uppercase"
                >
                  <Pencil size={12} /> Editar
                </button>
                <div className="border-l border-gray-100" />
                <button
                  onClick={() => openPrint(c)}
                  className="flex-1 flex items-center justify-center gap-1.5 py-2 text-gray-600 hover:bg-gray-50 text-[10px] font-bold transition-colors uppercase"
                >
                  <Printer size={12} /> Imprimir
                </button>
                <div className="border-l border-gray-100" />
                <button
                  onClick={() => handleDelete(c.id, c.pacienteNome)}
                  className="flex-1 flex items-center justify-center gap-1.5 py-2 text-red-500 hover:bg-red-50 rounded-br-xl text-[10px] font-bold transition-colors uppercase"
                >
                  <Trash2 size={12} /> Excluir
                </button>
              </div>
            </div>
          ))}
        </div>
      )}

      {/* Modal */}
      {modalOpen && (
        <OrcamentoModal
          contrato={modalOrcamento}
          initialView={modalView}
          onClose={() => { setModalOpen(false); setModalOrcamento(null); setModalView('editor'); }}
          onSaved={refresh}
        />
      )}

      {/* Gerar automático: picker de paciente */}
      {autoOpen && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/60 backdrop-blur-sm p-4"
          onMouseDown={(e) => { if (e.target === e.currentTarget && !autoGerando) setAutoOpen(false); }}>
          <div className="bg-white rounded-2xl w-full max-w-md shadow-2xl overflow-hidden">
            <div className="px-6 py-4 border-b border-gray-100 flex items-center justify-between">
              <div>
                <h3 className="text-sm font-black text-gray-900 uppercase flex items-center gap-2"><Zap size={16} className="text-teal-600" /> Gerar automático</h3>
                <p className="text-[10px] font-bold uppercase tracking-widest text-teal-600">Escolha o paciente · cláusulas padrão</p>
              </div>
              <button onClick={() => setAutoOpen(false)} disabled={autoGerando} className="p-2 hover:bg-gray-100 rounded-xl transition-colors disabled:opacity-50"><X size={18} /></button>
            </div>
            <div className="p-5">
              <div className="relative mb-3">
                <Search size={16} className="absolute left-3 top-1/2 -translate-y-1/2 text-gray-400 pointer-events-none" />
                <input autoFocus value={autoSearch} onChange={e => setAutoSearch(e.target.value)} placeholder="Buscar paciente por nome, CPF ou telefone…"
                  className="w-full pl-9 pr-3 py-2.5 bg-gray-50 border border-gray-200 rounded-xl text-sm outline-none focus:border-teal-400 focus:bg-white" />
              </div>
              <div className="max-h-72 overflow-y-auto -mx-1 px-1 space-y-1">
                {autoLoading ? (
                  <div className="flex justify-center py-6"><Loader2 size={20} className="animate-spin text-teal-500" /></div>
                ) : autoPacientes.length === 0 ? (
                  <div className="text-center py-6 text-gray-400">
                    <UserSearch size={28} className="mx-auto mb-2 opacity-40" />
                    <p className="text-xs font-bold uppercase">{autoSearch ? 'Nenhum paciente encontrado' : 'Digite para buscar um paciente'}</p>
                  </div>
                ) : autoPacientes.map(p => (
                  <button key={p.id} type="button" disabled={autoGerando} onClick={() => gerarAuto(p)}
                    className="w-full text-left px-3 py-2.5 rounded-lg border border-gray-100 hover:border-teal-300 hover:bg-teal-50/50 transition-colors flex items-center justify-between gap-2 disabled:opacity-60">
                    <span className="text-sm font-bold text-gray-800 uppercase truncate">{p.nome}</span>
                    {autoGerando ? <Loader2 size={14} className="animate-spin text-teal-500 shrink-0" /> : <Zap size={14} className="text-teal-600 shrink-0" />}
                  </button>
                ))}
              </div>
            </div>
          </div>
        </div>
      )}
    </div>
  );
};