import React, { useState } from 'react';
import { Search, Plus, DollarSign, CheckCircle2, TrendingUp, Trash2, X, Calendar, Pencil, RefreshCw, Sparkles, ChevronDown } from 'lucide-react';
import { Receivable } from '../types';
import { useToast } from '../contexts/ToastContext';
import { useComFi } from '../contexts/ComFiContext';
import { CustomSelect } from './CustomSelect';

interface AccountsReceivableViewProps {
  receivables: Receivable[];
  setReceivables: React.Dispatch<React.SetStateAction<Receivable[]>>;
}

export const AccountsReceivableView: React.FC<AccountsReceivableViewProps> = ({ receivables, setReceivables }) => {
  const { addToast } = useToast();
  const { companies } = useComFi();
  const [isModalOpen, setIsModalOpen] = useState(false);
  const [filterStatus, setFilterStatus] = useState<'all' | 'paid' | 'pending'>('all');
  
  const [newReceivable, setNewReceivable] = useState<Partial<Receivable>>({
    type: 'one-time',
    status: 'pending',
    dueDate: new Date().toISOString().split('T')[0]
  });

  const [editingId, setEditingId] = useState<string | null>(null);

  const totalReceivable = receivables.reduce((acc, curr) => acc + curr.value, 0);
  const totalReceived = receivables.filter(r => r.status === 'paid').reduce((acc, curr) => acc + curr.value, 0);
  const totalPending = receivables.filter(r => r.status === 'pending' || r.status === 'overdue').reduce((acc, curr) => acc + curr.value, 0);

  const filteredList = receivables.filter(r => filterStatus === 'all' ? true : r.status === (filterStatus === 'paid' ? 'paid' : 'pending'));

  const handleGenerateRecurring = () => {
    const currentMonth = new Date().toISOString().slice(0, 7);
    const today = new Date().toISOString().split('T')[0];
    let generatedCount = 0;
    const newReceivables: Receivable[] = [];

    companies.forEach(company => {
      if (company.status !== 'active') return;
      company.activeServices.forEach(service => {
        if (service.billingType === 'recurring') {
          const exists = receivables.find(r => 
            r.companyName === (company.fantasyName || company.name) && 
            r.description === service.name &&
            r.dueDate.startsWith(currentMonth)
          );
          if (!exists) {
            newReceivables.push({
              id: Math.random().toString(36).substr(2, 9),
              description: service.name,
              companyName: company.fantasyName || company.name,
              category: service.category,
              value: service.price,
              dueDate: today,
              status: 'pending',
              type: 'recurring'
            });
            generatedCount++;
          }
        }
      });
    });

    if (generatedCount > 0) {
      setReceivables(prev => [...prev, ...newReceivables]);
      addToast({ type: 'success', title: 'Processamento Concluído', message: `${generatedCount} faturas recorrentes geradas.` });
    } else {
      addToast({ type: 'info', title: 'Tudo em dia', message: 'Cobranças mensais já processadas.' });
    }
  };

  const handleSave = () => {
    if (!newReceivable.description || !newReceivable.value) {
       addToast({ type: 'warning', title: 'Dados Incompletos' });
       return;
    }

    if (editingId) {
        setReceivables(receivables.map(r => r.id === editingId ? {
             ...newReceivable, 
             id: editingId,
             value: Number(newReceivable.value),
             category: newReceivable.category ?? 'Outros',
             companyName: newReceivable.companyName ?? 'Avulso'
        } as Receivable : r));
    } else {
        const item: Receivable = {
          ...newReceivable,
          id: Math.random().toString(36).substr(2, 9),
          value: Number(newReceivable.value),
          category: newReceivable.category ?? 'Outros',
          companyName: newReceivable.companyName ?? 'Avulso'
        } as Receivable;
        setReceivables([...receivables, item]);
    }
    
    setIsModalOpen(false);
    setEditingId(null);
  };

  const toggleStatus = (id: string) => {
    setReceivables(receivables.map(r => r.id === id ? { ...r, status: r.status === 'paid' ? 'pending' : 'paid' } : r));
  };

  const inputClass = "w-full p-3 bg-white border border-slate-200 rounded-xl outline-none focus:ring-2 focus:ring-primary-500 text-slate-800";

  return (
    <div className="space-y-6 animate-fade-in">
      <div className="grid grid-cols-1 md:grid-cols-3 gap-6">
        <div className="bg-white p-6 rounded-[2rem] border border-slate-50 shadow-sm flex items-center gap-4">
          <div className="w-12 h-12 rounded-xl bg-slate-100 flex items-center justify-center text-slate-500"><DollarSign size={24} /></div>
          <div><p className="text-slate-400 text-xs font-bold uppercase">Previsto</p><h3 className="text-2xl font-bold text-slate-800">R$ {totalReceivable.toLocaleString('pt-BR')}</h3></div>
        </div>
        <div className="bg-white p-6 rounded-[2rem] border border-slate-50 shadow-sm flex items-center gap-4">
          <div className="w-12 h-12 rounded-xl bg-green-50 flex items-center justify-center text-green-600"><CheckCircle2 size={24} /></div>
          <div><p className="text-slate-400 text-xs font-bold uppercase">Recebido</p><h3 className="text-2xl font-bold text-green-600">R$ {totalReceived.toLocaleString('pt-BR')}</h3></div>
        </div>
        <div className="bg-white p-6 rounded-[2rem] border border-slate-50 shadow-sm flex items-center gap-4">
          <div className="w-12 h-12 rounded-xl bg-amber-50 flex items-center justify-center text-amber-600"><TrendingUp size={24} /></div>
          <div><p className="text-slate-400 text-xs font-bold uppercase">A Receber</p><h3 className="text-2xl font-bold text-amber-600">R$ {totalPending.toLocaleString('pt-BR')}</h3></div>
        </div>
      </div>

      <div className="flex justify-between items-center">
        <h1 className="text-2xl font-bold text-slate-800">Contas a Receber</h1>
        <div className="flex gap-3">
          <button onClick={handleGenerateRecurring} className="flex items-center gap-2 px-5 py-3 bg-indigo-500 text-white rounded-xl font-bold"><RefreshCw size={18} /> Gerar Mensalidades</button>
          <button onClick={() => { setEditingId(null); setIsModalOpen(true); }} className="flex items-center gap-2 px-5 py-3 bg-green-500 text-white rounded-xl font-bold"><Plus size={18} /> Novo</button>
        </div>
      </div>

      <div className="bg-white rounded-2xl shadow-sm border border-slate-100 overflow-hidden">
        <table className="w-full text-left">
          <thead className="bg-slate-50">
            <tr>
              <th className="p-4 text-xs font-bold uppercase text-slate-500">Descrição</th>
              <th className="p-4 text-xs font-bold uppercase text-slate-500">Valor</th>
              <th className="p-4 text-xs font-bold uppercase text-slate-500 text-center">Status</th>
              <th className="p-4"></th>
            </tr>
          </thead>
          <tbody>
            {filteredList.map(item => (
              <tr key={item.id} className="border-b border-slate-50">
                <td className="p-4 font-bold text-slate-800">{item.description}<div className="text-xs text-slate-400">{item.companyName}</div></td>
                <td className="p-4 font-bold">R$ {item.value.toLocaleString('pt-BR')}</td>
                <td className="p-4 text-center">
                  <button onClick={() => toggleStatus(item.id)} className={`px-3 py-1 rounded-full text-xs font-bold border ${item.status === 'paid' ? 'bg-green-50 text-green-600 border-green-100' : 'bg-amber-50 text-amber-600 border-amber-100'}`}>
                    {item.status === 'paid' ? 'PAGO' : 'PENDENTE'}
                  </button>
                </td>
                <td className="p-4 text-right">
                  <button onClick={() => { setNewReceivable(item); setEditingId(item.id); setIsModalOpen(true); }} className="p-2 text-slate-400 hover:text-primary-500"><Pencil size={18} /></button>
                </td>
              </tr>
            ))}
          </tbody>
        </table>
      </div>

      {isModalOpen && (
        <div className="fixed inset-0 z-50 flex items-center justify-center p-4">
          <div className="absolute inset-0 bg-slate-900/60 backdrop-blur-sm" onClick={() => setIsModalOpen(false)}></div>
          <div className="relative bg-white rounded-2xl p-6 w-full max-w-md animate-scale-up">
            <h3 className="font-bold text-slate-800 text-lg mb-4">Lançamento de Receita</h3>
            <div className="space-y-4">
              <input type="text" className={inputClass} placeholder="Descrição" value={newReceivable.description ?? ''} onChange={e => setNewReceivable({...newReceivable, description: e.target.value})} />
              <input type="number" className={inputClass} placeholder="Valor" value={newReceivable.value ?? ''} onChange={e => setNewReceivable({...newReceivable, value: Number(e.target.value)})} />
              <div className="grid grid-cols-2 gap-4">
                <CustomSelect 
                  value={newReceivable.category ?? 'Serviços'} 
                  onChange={val => setNewReceivable({...newReceivable, category: val})} 
                  options={[{value:'Serviços', label:'Serviços'}, {value:'Produtos', label:'Produtos'}, {value:'Outros', label:'Outros'}]} 
                />
                <CustomSelect 
                  value={newReceivable.type ?? 'one-time'} 
                  onChange={val => setNewReceivable({...newReceivable, type: val})} 
                  options={[{value:'one-time', label:'Avulso'}, {value:'recurring', label:'Mensal'}]} 
                />
              </div>
              <button onClick={handleSave} className="w-full py-3 bg-primary-500 text-white font-bold rounded-xl shadow-lg">Salvar</button>
            </div>
          </div>
        </div>
      )}
    </div>
  );
};