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

interface AccountsPayableViewProps {
  expenses: Expense[];
  setExpenses: (expenses: Expense[]) => void;
}

export const AccountsPayableView: React.FC<AccountsPayableViewProps> = ({ expenses, setExpenses }) => {
  const { addToast } = useToast();
  const [isModalOpen, setIsModalOpen] = useState(false);
  const [filterType, setFilterType] = useState<'all' | 'fixed' | 'variable'>('all');
  
  const [newExpense, setNewExpense] = useState<Partial<Expense>>({
    type: 'fixed',
    status: 'pending',
    dueDate: new Date().toISOString().split('T')[0]
  });
  
  const [editingId, setEditingId] = useState<string | null>(null);

  // Totals Calculation
  const totalPayable = expenses.reduce((acc, curr) => acc + curr.amount, 0);
  const totalPaid = expenses.filter(e => e.status === 'paid').reduce((acc, curr) => acc + curr.amount, 0);
  const totalPending = expenses.filter(e => e.status === 'pending' || e.status === 'overdue').reduce((acc, curr) => acc + curr.amount, 0);

  const filteredExpenses = expenses.filter(e => filterType === 'all' ? true : e.type === filterType);

  const openEditModal = (expense: Expense) => {
      setNewExpense(expense);
      setEditingId(expense.id);
      setIsModalOpen(true);
  };

  const openCreateModal = () => {
      setNewExpense({
        type: 'fixed',
        status: 'pending',
        dueDate: new Date().toISOString().split('T')[0]
      });
      setEditingId(null);
      setIsModalOpen(true);
  }

  const handleSaveExpense = () => {
    if (!newExpense.title || !newExpense.amount) {
        addToast({ type: 'warning', title: 'Campos Obrigatórios', message: 'Preencha o título e valor da despesa.' });
        return;
    }
    
    if (editingId) {
        // Edit existing
        setExpenses(expenses.map(e => e.id === editingId ? { ...newExpense, id: editingId, amount: Number(newExpense.amount) } as Expense : e));
        addToast({ type: 'success', title: 'Atualizado', message: 'Despesa atualizada com sucesso.' });
    } else {
        // Create new
        const expense: Expense = {
          ...newExpense,
          id: Math.random().toString(36).substr(2, 9),
          amount: Number(newExpense.amount)
        } as Expense;
        setExpenses([...expenses, expense]);
        addToast({ type: 'success', title: 'Registrado', message: 'Nova despesa adicionada.' });
    }
    
    setIsModalOpen(false);
    setEditingId(null);
    setNewExpense({ type: 'fixed', status: 'pending', dueDate: new Date().toISOString().split('T')[0] });
  };

  const handleDelete = (id: string) => {
    if(window.confirm("Excluir conta?")) {
      setExpenses(expenses.filter(e => e.id !== id));
      addToast({ type: 'info', title: 'Excluído', message: 'Despesa removida.' });
    }
  }

  const toggleStatus = (id: string) => {
    setExpenses(expenses.map(e => {
        if(e.id === id) {
             const newStatus = e.status === 'paid' ? 'pending' : 'paid';
             if (newStatus === 'paid') addToast({ type: 'success', title: 'Pago!', message: 'Despesa marcada como paga.' });
             return { ...e, status: newStatus };
        }
        return e;
    }));
  }

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

  return (
    <div className="space-y-6 animate-fade-in">
      
      {/* KPI Cards */}
      <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">Total Previsto</p>
            <h3 className="text-2xl font-bold text-slate-800">R$ {totalPayable.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">Total Pago</p>
            <h3 className="text-2xl font-bold text-green-600">R$ {totalPaid.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-red-50 flex items-center justify-center text-red-600">
            <AlertCircle size={24} />
          </div>
          <div>
            <p className="text-slate-400 text-xs font-bold uppercase">A Pagar / Pendente</p>
            <h3 className="text-2xl font-bold text-red-600">R$ {totalPending.toLocaleString('pt-BR')}</h3>
          </div>
        </div>
      </div>

      <div className="flex flex-col md:flex-row justify-between items-center gap-4">
        <div>
          <h1 className="text-2xl font-bold text-slate-800">Contas a Pagar</h1>
          <p className="text-slate-500">Gerencie despesas fixas e variáveis.</p>
        </div>
        <button onClick={openCreateModal} className="flex items-center gap-2 px-5 py-3 bg-red-500 text-white rounded-xl shadow-lg shadow-red-200/50 hover:bg-red-600 font-bold transition-all">
          <Plus size={20} /> Nova Despesa
        </button>
      </div>

      <div className="bg-white rounded-2xl shadow-sm border border-slate-100 overflow-hidden">
        {/* Toolbar */}
        <div className="p-4 border-b border-slate-100 flex flex-wrap gap-4 items-center">
          <div className="relative flex-1 min-w-[200px]">
            <Search className="absolute left-3 top-1/2 -translate-y-1/2 text-slate-400" size={18} />
            <input 
              type="text" 
              placeholder="Buscar despesa..." 
              className="w-full pl-10 pr-4 py-2 bg-slate-50 border-none rounded-xl focus:ring-2 focus:ring-primary-500 outline-none text-slate-600"
            />
          </div>
          <div className="flex gap-2 bg-slate-50 p-1 rounded-xl">
             <button 
               onClick={() => setFilterType('all')}
               className={`px-4 py-1.5 rounded-lg text-sm font-medium transition-colors ${filterType === 'all' ? 'bg-white shadow text-slate-800' : 'text-slate-500 hover:text-slate-700'}`}
             >
               Todas
             </button>
             <button 
               onClick={() => setFilterType('fixed')}
               className={`px-4 py-1.5 rounded-lg text-sm font-medium transition-colors ${filterType === 'fixed' ? 'bg-white shadow text-slate-800' : 'text-slate-500 hover:text-slate-700'}`}
             >
               Fixas
             </button>
             <button 
               onClick={() => setFilterType('variable')}
               className={`px-4 py-1.5 rounded-lg text-sm font-medium transition-colors ${filterType === 'variable' ? 'bg-white shadow text-slate-800' : 'text-slate-500 hover:text-slate-700'}`}
             >
               Variáveis
             </button>
          </div>
        </div>

        {/* Table */}
        <div className="overflow-x-auto">
          <table className="w-full text-left">
             <thead className="bg-slate-50/50">
               <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">Categoria</th>
                 <th className="p-4 text-xs font-bold uppercase text-slate-500">Vencimento</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">Tipo</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 className="divide-y divide-slate-50">
                {filteredExpenses.map(expense => (
                  <tr key={expense.id} className="hover:bg-slate-50 transition-colors group">
                    <td className="p-4 font-bold text-slate-800">{expense.title}</td>
                    <td className="p-4">
                      <span className="px-2 py-1 bg-slate-100 rounded text-xs text-slate-600">{expense.category}</span>
                    </td>
                    <td className="p-4 text-sm text-slate-600">
                      <div className="flex items-center gap-2">
                        <Calendar size={14} className="text-slate-400"/>
                        {new Date(expense.dueDate).toLocaleDateString('pt-BR')}
                      </div>
                    </td>
                    <td className="p-4 font-bold text-slate-800">R$ {expense.amount.toLocaleString('pt-BR')}</td>
                    <td className="p-4 text-center">
                       <span className={`text-[10px] font-bold uppercase px-2 py-0.5 rounded ${expense.type === 'fixed' ? 'bg-blue-50 text-blue-600' : 'bg-amber-50 text-amber-600'}`}>
                         {expense.type === 'fixed' ? 'Fixa' : 'Variável'}
                       </span>
                    </td>
                    <td className="p-4 text-center">
                      <button onClick={() => toggleStatus(expense.id)} className={`px-3 py-1 rounded-full text-xs font-bold border transition-all ${
                        expense.status === 'paid' ? 'bg-green-50 text-green-600 border-green-200 hover:bg-green-100' :
                        expense.status === 'overdue' ? 'bg-red-50 text-red-600 border-red-200 hover:bg-red-100' :
                        'bg-slate-50 text-slate-500 border-slate-200 hover:bg-slate-100'
                      }`}>
                        {expense.status === 'paid' ? 'PAGO' : expense.status === 'overdue' ? 'ATRASADO' : 'PENDENTE'}
                      </button>
                    </td>
                    <td className="p-4 text-right">
                       <div className="flex justify-end gap-2 opacity-0 group-hover:opacity-100 transition-opacity">
                          <button onClick={() => openEditModal(expense)} className="p-2 text-slate-400 hover:text-primary-500 hover:bg-primary-50 rounded-lg transition-colors">
                            <Pencil size={18} />
                          </button>
                          <button onClick={() => handleDelete(expense.id)} className="p-2 text-slate-400 hover:text-red-500 hover:bg-red-50 rounded-lg transition-colors">
                            <Trash2 size={18} />
                          </button>
                       </div>
                    </td>
                  </tr>
                ))}
             </tbody>
          </table>
          {filteredExpenses.length === 0 && (
              <div className="p-10 text-center text-slate-400">
                  <Sparkles size={32} className="mx-auto mb-2 opacity-20"/>
                  <p>Nenhuma despesa encontrada.</p>
              </div>
          )}
        </div>
      </div>

      {/* Modal */}
      {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 shadow-xl w-full max-w-md animate-scale-up flex flex-col max-h-[90vh]">
            <div className="flex justify-between items-center px-6 py-4 border-b border-slate-100 flex-shrink-0">
              <h3 className="font-bold text-slate-800 text-lg">{editingId ? 'Editar Despesa' : 'Nova Despesa'}</h3>
              <button onClick={() => setIsModalOpen(false)}><X size={20} className="text-slate-400 hover:text-slate-600"/></button>
            </div>
            
            <div className="p-6 space-y-4 overflow-y-auto">
              <div>
                <label className="block text-sm font-bold text-slate-800 mb-1">Título</label>
                <input 
                  type="text" 
                  className={inputClass} 
                  placeholder="Ex: Aluguel Escritório"
                  value={newExpense.title || ''}
                  onChange={e => setNewExpense({...newExpense, title: e.target.value})}
                />
              </div>

              <div className="grid grid-cols-2 gap-4">
                <div>
                   <label className="block text-sm font-bold text-slate-800 mb-1">Valor (R$)</label>
                   <input 
                    type="number" 
                    className={inputClass} 
                    placeholder="0,00"
                    value={newExpense.amount || ''}
                    onChange={e => setNewExpense({...newExpense, amount: Number(e.target.value)})}
                  />
                </div>
                <div>
                   <label className="block text-sm font-bold text-slate-800 mb-1">Vencimento</label>
                   <input 
                    type="date" 
                    className={inputClass} 
                    value={newExpense.dueDate}
                    onChange={e => setNewExpense({...newExpense, dueDate: e.target.value})}
                  />
                </div>
              </div>

              <div className="grid grid-cols-2 gap-4">
                <div>
                  <label className="block text-sm font-bold text-slate-800 mb-1">Categoria</label>
                  <CustomSelect 
                    value={newExpense.category || 'Operacional'}
                    onChange={(val) => setNewExpense({...newExpense, category: val})}
                    options={[
                        { value: 'Operacional', label: 'Operacional' },
                        { value: 'Administrativo', label: 'Administrativo' },
                        { value: 'Impostos', label: 'Impostos' },
                        { value: 'Marketing', label: 'Marketing' },
                        { value: 'Pessoal', label: 'Pessoal / Folha' },
                    ]}
                  />
                </div>
                <div>
                  <label className="block text-sm font-bold text-slate-800 mb-1">Tipo</label>
                  <CustomSelect 
                    value={newExpense.type || 'fixed'}
                    onChange={(val) => setNewExpense({...newExpense, type: val})}
                    options={[
                        { value: 'fixed', label: 'Fixa' },
                        { value: 'variable', label: 'Variável' },
                    ]}
                  />
                </div>
              </div>
              
              <button onClick={handleSaveExpense} className="w-full py-3 bg-red-500 text-white font-bold rounded-xl mt-4 hover:bg-red-600 shadow-lg shadow-red-200">
                {editingId ? 'Salvar Alterações' : 'Registrar Despesa'}
              </button>
            </div>
          </div>
        </div>
      )}
    </div>
  );
};