import React, { createContext, useContext, useEffect, useMemo, useState } from 'react';
import { Company, Expense, Receivable, Service, AppUser, Client, FinancialSummary, TenantProfile, Category, Proposal } from '../types';
import { useStickyState } from '../hooks/useStickyState';

// --- MOCK DATA GENERATORS (Moved from App.tsx) ---
const getDynamicDate = (daysOffset: number) => {
  const date = new Date();
  date.setDate(date.getDate() + daysOffset);
  return date.toISOString().split('T')[0];
};

const initialServices: Service[] = [
  { id: '1', name: 'Consultoria Financeira', category: 'Consultoria', price: 2500, active: true, description: 'Análise completa.', billingType: 'one-time' },
  { id: '2', name: 'Gestão de Mídias', category: 'Marketing', price: 1500, active: true, description: 'Postagens mensais.', billingType: 'recurring' },
  { id: '3', name: 'Suporte TI', category: 'TI', price: 800, active: true, description: 'SLA 24h.', billingType: 'recurring' },
  { id: '4', name: 'Desenvolvimento Web', category: 'Tecnologia', price: 5000, active: true, description: 'Site institucional.', billingType: 'one-time' },
];

const initialCompanies: Company[] = [
  {
    id: '1', name: 'Uda Studios Tecnologia LTDA', fantasyName: 'Uda Studios', cnpj: '12.345.678/0001-90', ie: '123.456.789.000', city: 'São Paulo - SP', logo: 'https://i.pravatar.cc/150?u=uda', status: 'active', industry: 'Tecnologia', email: 'financeiro@uda.com', phone: '(11) 3344-5566', address: 'Av. Paulista, 1000, Bela Vista', since: '2022', description: 'Estúdio de software.', contacts: [{ id: 'c1', name: 'Roberto Silva', role: 'CEO', email: 'roberto@uda.com', phone: '11999998888', avatar: 'https://i.pravatar.cc/150?u=1' }], documents: [], activeServices: [initialServices[1], initialServices[3]] 
  },
  {
    id: '2', name: 'Angels Healthcare S.A.', fantasyName: 'Angels Health', cnpj: '98.765.432/0001-10', city: 'Rio de Janeiro - RJ', logo: 'https://i.pravatar.cc/150?u=angels', status: 'active', industry: 'Saúde', email: 'contato@angels.com', phone: '(21) 2233-4455', address: 'Rua da Saúde, 500', since: '2021', description: 'Rede de clínicas.', contacts: [], documents: [], activeServices: [initialServices[0], initialServices[2]] 
  },
  {
    id: '3', name: 'Padaria do João MEI', fantasyName: 'Padaria do João', cnpj: '11.111.111/0001-11', city: 'Belo Horizonte - MG', logo: 'https://i.pravatar.cc/150?u=joao', status: 'overdue', industry: 'Varejo', email: 'joao@padaria.com', phone: '(31) 3333-3333', address: 'Rua do Pão, 10', since: '2023', description: 'Padaria artesanal.', contacts: [], documents: [], activeServices: [initialServices[1]] 
  }
];

const initialExpenses: Expense[] = [
  { id: 'e1', title: 'Aluguel Escritório', category: 'Operacional', amount: 3500, dueDate: getDynamicDate(-30), status: 'paid', type: 'fixed' },
  { id: 'e2', title: 'Servidor AWS', category: 'TI', amount: 850, dueDate: getDynamicDate(-28), status: 'paid', type: 'variable' },
  { id: 'e3', title: 'Energia Elétrica', category: 'Operacional', amount: 450, dueDate: getDynamicDate(-2), status: 'paid', type: 'variable' },
  { id: 'e4', title: 'Licença Software CRM', category: 'TI', amount: 200, dueDate: getDynamicDate(5), status: 'pending', type: 'fixed' },
  { id: 'e5', title: 'Folha de Pagamento', category: 'Pessoal', amount: 15000, dueDate: getDynamicDate(10), status: 'pending', type: 'fixed' },
  { id: 'e6', title: 'DAS Simples Nacional', category: 'Impostos', amount: 1200, dueDate: getDynamicDate(15), status: 'pending', type: 'variable' },
  { id: 'e7', title: 'Aluguel Escritório', category: 'Operacional', amount: 3500, dueDate: getDynamicDate(30), status: 'pending', type: 'fixed' },
];

const initialProposals: Proposal[] = [
    {
        id: 'p1', number: 'PROP-001', clientId: '1', clientName: 'Uda Studios', clientEmail: 'roberto@uda.com',
        issueDate: getDynamicDate(-2), validUntil: getDynamicDate(5), status: 'sent', totalValue: 7500,
        items: [
            { id: 'i1', description: 'Consultoria Financeira', quantity: 1, unitPrice: 2500, total: 2500 },
            { id: 'i2', description: 'Desenvolvimento Web', quantity: 1, unitPrice: 5000, total: 5000 }
        ],
        notes: 'Pagamento 50% na entrada e 50% na entrega.'
    }
];

const initialSuperAdmin: AppUser = { id: 'u1', name: 'Nella Vita', email: 'admin@comfi.com', role: 'super_admin', active: true, avatar: 'https://i.pravatar.cc/150?u=admin', permissions: [] };
const initialUsers: AppUser[] = [
  initialSuperAdmin,
  { id: 'u2', name: 'João Comercial', email: 'vendas@comfi.com', role: 'user', active: true, avatar: 'https://i.pravatar.cc/150?u=joao', permissions: ['crm', 'kanban', 'calendar', 'proposals'] },
  { id: 'u3', name: 'Maria Financeiro', email: 'fin@comfi.com', role: 'user', active: true, avatar: 'https://i.pravatar.cc/150?u=maria', permissions: ['dashboard', 'receivables', 'payables', 'invoicing'] }
];

const initialTenant: TenantProfile = {
    name: 'Minha Empresa S.A.',
    cnpj: '00.000.000/0001-00',
    email: 'contato@minhaempresa.com',
    phone: '(11) 99999-9999',
    address: 'Av. Brigadeiro Faria Lima, 1234, SP',
    logo: '',
    primaryColor: '#f97316'
};

const initialCategories: Category[] = [
    { id: 'c1', name: 'Operacional', type: 'expense', color: 'bg-red-50 text-red-600' },
    { id: 'c2', name: 'Administrativo', type: 'expense', color: 'bg-blue-50 text-blue-600' },
    { id: 'c3', name: 'Marketing', type: 'expense', color: 'bg-purple-50 text-purple-600' },
    { id: 'c4', name: 'Pessoal', type: 'expense', color: 'bg-yellow-50 text-yellow-600' },
    { id: 'c5', name: 'Impostos', type: 'expense', color: 'bg-slate-50 text-slate-600' },
    { id: 'c6', name: 'Serviços', type: 'income', color: 'bg-green-50 text-green-600' },
];

const generateInitialReceivables = (companies: Company[]): Receivable[] => {
  const receivables: Receivable[] = [];
  companies.forEach((company, cIndex) => {
    company.activeServices.forEach((service, sIndex) => {
      receivables.push({ id: `r-${company.id}-${sIndex}-past`, description: service.name, companyName: company.fantasyName || company.name, category: service.category, value: service.price, dueDate: getDynamicDate(-30 - (cIndex * 2)), status: 'paid', type: service.billingType === 'recurring' ? 'recurring' : 'one-time' });
      const isOverdue = company.status === 'overdue' && sIndex === 0;
      receivables.push({ id: `r-${company.id}-${sIndex}-curr`, description: service.name, companyName: company.fantasyName || company.name, category: service.category, value: service.price, dueDate: getDynamicDate(isOverdue ? -5 : 10 + (cIndex * 3)), status: isOverdue ? 'overdue' : 'pending', type: service.billingType === 'recurring' ? 'recurring' : 'one-time' });
      if (service.billingType === 'recurring') {
          receivables.push({ id: `r-${company.id}-${sIndex}-next`, description: service.name, companyName: company.fantasyName || company.name, category: service.category, value: service.price, dueDate: getDynamicDate(40 + (cIndex * 2)), status: 'pending', type: 'recurring' });
      }
    });
  });
  return receivables;
};

// --- CONTEXT INTERFACE ---
interface ComFiContextData {
  services: Service[];
  setServices: (data: Service[]) => void;
  companies: Company[];
  setCompanies: (data: Company[]) => void;
  expenses: Expense[];
  setExpenses: (data: Expense[]) => void;
  clients: Client[];
  setClients: (data: Client[]) => void;
  receivables: Receivable[];
  setReceivables: React.Dispatch<React.SetStateAction<Receivable[]>>;
  proposals: Proposal[];
  setProposals: (data: Proposal[]) => void;
  currentUser: AppUser;
  setCurrentUser: (user: AppUser) => void;
  users: AppUser[];
  setUsers: (users: AppUser[]) => void;
  financialSummary: FinancialSummary;
  addReceivable: (receivable: Receivable) => void;
  tenant: TenantProfile;
  setTenant: (tenant: TenantProfile) => void;
  categories: Category[];
  setCategories: (categories: Category[]) => void;
}

const ComFiContext = createContext<ComFiContextData>({} as ComFiContextData);

export const ComFiProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
  // State Initialization
  const [services, setServices] = useStickyState<Service[]>(initialServices, 'comfi_services');
  const [companies, setCompanies] = useStickyState<Company[]>(initialCompanies, 'comfi_companies');
  const [expenses, setExpenses] = useStickyState<Expense[]>(initialExpenses, 'comfi_expenses');
  const [clients, setClients] = useStickyState<Client[]>([], 'comfi_clients');
  const [currentUser, setCurrentUser] = useStickyState<AppUser>(initialSuperAdmin, 'comfi_current_user');
  const [users, setUsers] = useStickyState<AppUser[]>(initialUsers, 'comfi_users');
  const [tenant, setTenant] = useStickyState<TenantProfile>(initialTenant, 'comfi_tenant');
  const [categories, setCategories] = useStickyState<Category[]>(initialCategories, 'comfi_categories');
  const [proposals, setProposals] = useStickyState<Proposal[]>(initialProposals, 'comfi_proposals');

  const [receivables, setReceivables] = useState<Receivable[]>(() => {
    try {
        const saved = window.localStorage.getItem('comfi_receivables');
        if (saved) return JSON.parse(saved);
        return generateInitialReceivables(initialCompanies);
    } catch (e) {
        return generateInitialReceivables(initialCompanies);
    }
  });

  useEffect(() => {
    window.localStorage.setItem('comfi_receivables', JSON.stringify(receivables));
  }, [receivables]);

  // Derived State: Financial Summary
  const financialSummary = useMemo(() => {
    const currentMonth = new Date().getMonth();
    const currentYear = new Date().getFullYear();
    const isCurrentMonth = (dateStr: string) => dateStr.startsWith(`${currentYear}-${String(currentMonth + 1).padStart(2, '0')}`);

    const currentReceivables = receivables.filter(r => isCurrentMonth(r.dueDate));
    const currentExpenses = expenses.filter(e => isCurrentMonth(e.dueDate));

    const totalRevenue = currentReceivables.reduce((acc, r) => acc + r.value, 0);
    const totalExpenses = currentExpenses.reduce((acc, expense) => acc + expense.amount, 0);
    const profit = totalRevenue - totalExpenses;
    const payablePending = expenses.filter(e => e.status !== 'paid').reduce((acc, expense) => acc + expense.amount, 0);
    const receivablePending = receivables.filter(r => r.status !== 'paid').reduce((acc, r) => acc + r.value, 0);

    return { totalRevenue, totalExpenses, profit, payablePending, receivablePending };
  }, [receivables, expenses]);

  const addReceivable = (newRec: Receivable) => {
    setReceivables(prev => [...prev, newRec]);
  };

  return (
    <ComFiContext.Provider value={{
      services, setServices,
      companies, setCompanies,
      expenses, setExpenses,
      clients, setClients,
      receivables, setReceivables,
      currentUser, setCurrentUser,
      users, setUsers,
      financialSummary,
      addReceivable,
      tenant, setTenant,
      categories, setCategories,
      proposals, setProposals
    }}>
      {children}
    </ComFiContext.Provider>
  );
};

export const useComFi = () => {
  const context = useContext(ComFiContext);
  if (!context) throw new Error('useComFi must be used within a ComFiProvider');
  return context;
};