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<!DOCTYPE html>
<html lang="pt-BR">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>PharmaManager - Sistema de Gerenciamento de Farmácia</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
    <style>
        .sidebar {
            transition: all 0.3s ease;
        }
        .sidebar.collapsed {
            width: 70px;
        }
        .sidebar.collapsed .sidebar-text {
            display: none;
        }
        .sidebar.collapsed .logo-text {
            display: none;
        }
        .main-content {
            transition: all 0.3s ease;
        }
        .main-content.expanded {
            margin-left: 70px;
        }
        @media (max-width: 768px) {
            .sidebar {
                width: 0;
                overflow: hidden;
            }
            .sidebar.collapsed {
                width: 0;
            }
            .main-content {
                margin-left: 0;
            }
            .mobile-menu-btn {
                display: block;
            }
        }
        .toast {
            animation: fadeInOut 3s ease-in-out;
        }
        @keyframes fadeInOut {
            0% { opacity: 0; }
            10% { opacity: 1; }
            90% { opacity: 1; }
            100% { opacity: 0; }
        }
    </style>
</head>
<body class="bg-gray-100">
    <!-- Mobile Menu Button -->
    <button class="mobile-menu-btn fixed top-4 left-4 z-50 bg-blue-600 text-white p-2 rounded-md shadow-lg md:hidden">
        <i class="fas fa-bars"></i>
    </button>

    <!-- Sidebar -->
    <div class="sidebar fixed h-full bg-blue-800 text-white w-64 shadow-lg">
        <div class="p-4 flex items-center">
            <i class="fas fa-pills text-2xl mr-2"></i>
            <span class="logo-text text-xl font-bold">PharmaManager</span>
        </div>
        <nav class="mt-6">
            <div class="px-4 py-2 hover:bg-blue-700 cursor-pointer flex items-center">
                <i class="fas fa-tachometer-alt mr-3"></i>
                <span class="sidebar-text">Dashboard</span>
            </div>
            <div class="px-4 py-2 hover:bg-blue-700 cursor-pointer flex items-center" id="customer-nav">
                <i class="fas fa-users mr-3"></i>
                <span class="sidebar-text">Clientes</span>
            </div>
            <div class="px-4 py-2 hover:bg-blue-700 cursor-pointer flex items-center" id="products-nav">
                <i class="fas fa-boxes mr-3"></i>
                <span class="sidebar-text">Produtos</span>
            </div>
            <div class="px-4 py-2 hover:bg-blue-700 cursor-pointer flex items-center" id="sales-nav">
                <i class="fas fa-shopping-cart mr-3"></i>
                <span class="sidebar-text">Vendas</span>
            </div>
            <div class="px-4 py-2 hover:bg-blue-700 cursor-pointer flex items-center" id="inventory-nav">
                <i class="fas fa-warehouse mr-3"></i>
                <span class="sidebar-text">Estoque</span>
            </div>
            <div class="px-4 py-2 hover:bg-blue-700 cursor-pointer flex items-center" id="reports-nav">
                <i class="fas fa-chart-bar mr-3"></i>
                <span class="sidebar-text">Relatórios</span>
            </div>
            <div class="px-4 py-2 hover:bg-blue-700 cursor-pointer flex items-center" id="settings-nav">
                <i class="fas fa-cog mr-3"></i>
                <span class="sidebar-text">Configurações</span>
            </div>
            <div class="px-4 py-2 hover:bg-blue-700 cursor-pointer flex items-center" id="backup-nav">
                <i class="fas fa-database mr-3"></i>
                <span class="sidebar-text">Backup/Restore</span>
            </div>
        </nav>
    </div>

    <!-- Main Content -->
    <div class="main-content ml-64 min-h-screen">
        <!-- Header -->
        <header class="bg-white shadow-sm p-4 flex justify-between items-center">
            <h1 class="text-2xl font-semibold text-gray-800" id="page-title">Dashboard</h1>
            <div class="flex items-center space-x-4">
                <div class="relative">
                    <i class="fas fa-bell text-gray-600 cursor-pointer hover:text-blue-600"></i>
                    <span class="absolute -top-1 -right-1 bg-red-500 text-white text-xs rounded-full h-4 w-4 flex items-center justify-center">3</span>
                </div>
                <div class="flex items-center space-x-2">
                    <img src="https://via.placeholder.com/40" alt="User" class="rounded-full">
                    <span class="text-gray-700">Admin</span>
                </div>
            </div>
        </header>

        <!-- Content Area -->
        <div class="p-6">
            <!-- Dashboard Content (default) -->
            <div id="dashboard-content">
                <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-6 mb-6">
                    <div class="bg-white p-6 rounded-lg shadow-md">
                        <div class="flex justify-between items-center">
                            <div>
                                <p class="text-gray-500">Clientes Cadastrados</p>
                                <h3 class="text-2xl font-bold" id="customer-count">0</h3>
                            </div>
                            <div class="bg-blue-100 p-3 rounded-full">
                                <i class="fas fa-users text-blue-600"></i>
                            </div>
                        </div>
                    </div>
                    <div class="bg-white p-6 rounded-lg shadow-md">
                        <div class="flex justify-between items-center">
                            <div>
                                <p class="text-gray-500">Produtos em Estoque</p>
                                <h3 class="text-2xl font-bold" id="product-count">0</h3>
                            </div>
                            <div class="bg-green-100 p-3 rounded-full">
                                <i class="fas fa-boxes text-green-600"></i>
                            </div>
                        </div>
                    </div>
                    <div class="bg-white p-6 rounded-lg shadow-md">
                        <div class="flex justify-between items-center">
                            <div>
                                <p class="text-gray-500">Vendas Hoje</p>
                                <h3 class="text-2xl font-bold" id="sales-today">0</h3>
                            </div>
                            <div class="bg-yellow-100 p-3 rounded-full">
                                <i class="fas fa-shopping-cart text-yellow-600"></i>
                            </div>
                        </div>
                    </div>
                    <div class="bg-white p-6 rounded-lg shadow-md">
                        <div class="flex justify-between items-center">
                            <div>
                                <p class="text-gray-500">Receita Mensal</p>
                                <h3 class="text-2xl font-bold" id="monthly-revenue">R$ 0,00</h3>
                            </div>
                            <div class="bg-purple-100 p-3 rounded-full">
                                <i class="fas fa-money-bill-wave text-purple-600"></i>
                            </div>
                        </div>
                    </div>
                </div>

                <div class="grid grid-cols-1 lg:grid-cols-3 gap-6">
                    <div class="bg-white p-6 rounded-lg shadow-md lg:col-span-2">
                        <h2 class="text-xl font-semibold mb-4">Vendas Recentes</h2>
                        <div class="overflow-x-auto">
                            <table class="min-w-full divide-y divide-gray-200">
                                <thead class="bg-gray-50">
                                    <tr>
                                        <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">ID</th>
                                        <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Cliente</th>
                                        <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Data</th>
                                        <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Total</th>
                                    </tr>
                                </thead>
                                <tbody class="bg-white divide-y divide-gray-200" id="recent-sales">
                                    <tr>
                                        <td colspan="4" class="px-6 py-4 text-center text-gray-500">Nenhuma venda recente</td>
                                    </tr>
                                </tbody>
                            </table>
                        </div>
                    </div>
                    <div class="bg-white p-6 rounded-lg shadow-md">
                        <h2 class="text-xl font-semibold mb-4">Estoque Baixo</h2>
                        <div class="space-y-4" id="low-stock">
                            <div class="text-center text-gray-500">Nenhum produto com estoque baixo</div>
                        </div>
                    </div>
                </div>
            </div>

            <!-- Customer Management Content -->
            <div id="customer-content" class="hidden">
                <div class="flex justify-between items-center mb-6">
                    <h2 class="text-2xl font-semibold">Gerenciamento de Clientes</h2>
                    <button id="add-customer-btn" class="bg-blue-600 text-white px-4 py-2 rounded-md hover:bg-blue-700 flex items-center">
                        <i class="fas fa-plus mr-2"></i> Novo Cliente
                    </button>
                </div>

                <div class="bg-white rounded-lg shadow-md overflow-hidden">
                    <div class="p-4 border-b flex justify-between items-center">
                        <div class="relative w-64">
                            <input type="text" id="customer-search" placeholder="Buscar clientes..." class="w-full pl-10 pr-4 py-2 border rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500">
                            <i class="fas fa-search absolute left-3 top-3 text-gray-400"></i>
                        </div>
                        <div class="flex space-x-2">
                            <button id="export-customers" class="bg-green-600 text-white px-3 py-1 rounded-md hover:bg-green-700 flex items-center">
                                <i class="fas fa-file-export mr-1"></i> Exportar
                            </button>
                            <button id="import-customers" class="bg-purple-600 text-white px-3 py-1 rounded-md hover:bg-purple-700 flex items-center">
                                <i class="fas fa-file-import mr-1"></i> Importar
                            </button>
                        </div>
                    </div>
                    <div class="overflow-x-auto">
                        <table class="min-w-full divide-y divide-gray-200">
                            <thead class="bg-gray-50">
                                <tr>
                                    <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">ID</th>
                                    <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Nome</th>
                                    <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">CPF</th>
                                    <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Telefone</th>
                                    <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Email</th>
                                    <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Ações</th>
                                </tr>
                            </thead>
                            <tbody class="bg-white divide-y divide-gray-200" id="customer-table-body">
                                <!-- Customer data will be inserted here -->
                            </tbody>
                        </table>
                    </div>
                    <div class="p-4 border-t flex justify-between items-center">
                        <div class="text-sm text-gray-500">
                            Mostrando <span id="customer-start">1</span> a <span id="customer-end">10</span> de <span id="customer-total">0</span> clientes
                        </div>
                        <div class="flex space-x-2">
                            <button id="customer-prev" class="px-3 py-1 border rounded-md disabled:opacity-50" disabled>Anterior</button>
                            <button id="customer-next" class="px-3 py-1 border rounded-md disabled:opacity-50" disabled>Próximo</button>
                        </div>
                    </div>
                </div>
            </div>

            <!-- Backup/Restore Content -->
            <div id="backup-content" class="hidden">
                <div class="flex justify-between items-center mb-6">
                    <h2 class="text-2xl font-semibold">Backup e Restauração</h2>
                </div>

                <div class="grid grid-cols-1 md:grid-cols-2 gap-6">
                    <div class="bg-white p-6 rounded-lg shadow-md">
                        <h3 class="text-xl font-semibold mb-4 flex items-center">
                            <i class="fas fa-download mr-2 text-blue-600"></i> Criar Backup
                        </h3>
                        <p class="text-gray-600 mb-4">Crie um backup completo do banco de dados para restaurar posteriormente.</p>
                        <button id="create-backup-btn" class="bg-blue-600 text-white px-4 py-2 rounded-md hover:bg-blue-700 flex items-center w-full justify-center">
                            <i class="fas fa-save mr-2"></i> Criar Backup
                        </button>
                    </div>

                    <div class="bg-white p-6 rounded-lg shadow-md">
                        <h3 class="text-xl font-semibold mb-4 flex items-center">
                            <i class="fas fa-upload mr-2 text-green-600"></i> Restaurar Backup
                        </h3>
                        <p class="text-gray-600 mb-4">Restaurar o banco de dados a partir de um arquivo de backup.</p>
                        <div class="mb-4">
                            <label class="block text-gray-700 mb-2">Selecione o arquivo de backup:</label>
                            <input type="file" id="restore-file" class="block w-full text-sm text-gray-500
                                file:mr-4 file:py-2 file:px-4
                                file:rounded-md file:border-0
                                file:text-sm file:font-semibold
                                file:bg-blue-50 file:text-blue-700
                                hover:file:bg-blue-100">
                        </div>
                        <button id="restore-backup-btn" class="bg-green-600 text-white px-4 py-2 rounded-md hover:bg-green-700 flex items-center w-full justify-center">
                            <i class="fas fa-redo mr-2"></i> Restaurar Backup
                        </button>
                    </div>
                </div>

                <div class="bg-white p-6 rounded-lg shadow-md mt-6">
                    <h3 class="text-xl font-semibold mb-4 flex items-center">
                        <i class="fas fa-history mr-2 text-purple-600"></i> Backups Disponíveis
                    </h3>
                    <div class="overflow-x-auto">
                        <table class="min-w-full divide-y divide-gray-200">
                            <thead class="bg-gray-50">
                                <tr>
                                    <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Data</th>
                                    <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Tamanho</th>
                                    <th class="px-6 py-3 text-left text-xs font-medium text-gray-500 uppercase tracking-wider">Ações</th>
                                </tr>
                            </thead>
                            <tbody class="bg-white divide-y divide-gray-200" id="backup-list">
                                <!-- Backup data will be inserted here -->
                            </tbody>
                        </table>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <!-- Add Customer Modal -->
    <div id="customer-modal" class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50 hidden">
        <div class="bg-white rounded-lg shadow-xl w-full max-w-2xl max-h-[90vh] overflow-y-auto">
            <div class="p-6">
                <div class="flex justify-between items-center mb-4">
                    <h3 class="text-xl font-semibold" id="modal-title">Adicionar Novo Cliente</h3>
                    <button id="close-modal" class="text-gray-500 hover:text-gray-700">
                        <i class="fas fa-times"></i>
                    </button>
                </div>
                <form id="customer-form">
                    <input type="hidden" id="customer-id">
                    <div class="grid grid-cols-1 md:grid-cols-2 gap-4 mb-4">
                        <div>
                            <label for="customer-name" class="block text-gray-700 mb-2">Nome Completo*</label>
                            <input type="text" id="customer-name" class="w-full px-3 py-2 border rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500" required>
                        </div>
                        <div>
                            <label for="customer-cpf" class="block text-gray-700 mb-2">CPF*</label>
                            <input type="text" id="customer-cpf" class="w-full px-3 py-2 border rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500" required>
                        </div>
                    </div>
                    <div class="grid grid-cols-1 md:grid-cols-2 gap-4 mb-4">
                        <div>
                            <label for="customer-phone" class="block text-gray-700 mb-2">Telefone*</label>
                            <input type="text" id="customer-phone" class="w-full px-3 py-2 border rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500" required>
                        </div>
                        <div>
                            <label for="customer-email" class="block text-gray-700 mb-2">Email</label>
                            <input type="email" id="customer-email" class="w-full px-3 py-2 border rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500">
                        </div>
                    </div>
                    <div class="mb-4">
                        <label for="customer-address" class="block text-gray-700 mb-2">Endereço</label>
                        <input type="text" id="customer-address" class="w-full px-3 py-2 border rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500">
                    </div>
                    <div class="grid grid-cols-1 md:grid-cols-3 gap-4 mb-6">
                        <div>
                            <label for="customer-city" class="block text-gray-700 mb-2">Cidade</label>
                            <input type="text" id="customer-city" class="w-full px-3 py-2 border rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500">
                        </div>
                        <div>
                            <label for="customer-state" class="block text-gray-700 mb-2">Estado</label>
                            <input type="text" id="customer-state" class="w-full px-3 py-2 border rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500">
                        </div>
                        <div>
                            <label for="customer-zip" class="block text-gray-700 mb-2">CEP</label>
                            <input type="text" id="customer-zip" class="w-full px-3 py-2 border rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500">
                        </div>
                    </div>
                    <div class="flex justify-end space-x-3">
                        <button type="button" id="cancel-customer" class="px-4 py-2 border border-gray-300 rounded-md text-gray-700 hover:bg-gray-100">Cancelar</button>
                        <button type="submit" class="px-4 py-2 bg-blue-600 text-white rounded-md hover:bg-blue-700">Salvar</button>
                    </div>
                </form>
            </div>
        </div>
    </div>

    <!-- Toast Notification -->
    <div id="toast" class="fixed bottom-4 right-4 bg-green-500 text-white px-6 py-3 rounded-md shadow-lg hidden">
        <div class="flex items-center">
            <i class="fas fa-check-circle mr-2"></i>
            <span id="toast-message">Operação realizada com sucesso!</span>
        </div>
    </div>

    <!-- Confirmation Modal -->
    <div id="confirm-modal" class="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50 hidden">
        <div class="bg-white rounded-lg shadow-xl w-full max-w-md">
            <div class="p-6">
                <div class="flex justify-between items-center mb-4">
                    <h3 class="text-xl font-semibold" id="confirm-title">Confirmar ação</h3>
                    <button id="close-confirm" class="text-gray-500 hover:text-gray-700">
                        <i class="fas fa-times"></i>
                    </button>
                </div>
                <p id="confirm-message">Tem certeza que deseja realizar esta ação?</p>
                <div class="flex justify-end space-x-3 mt-6">
                    <button type="button" id="cancel-confirm" class="px-4 py-2 border border-gray-300 rounded-md text-gray-700 hover:bg-gray-100">Cancelar</button>
                    <button type="button" id="confirm-action" class="px-4 py-2 bg-red-600 text-white rounded-md hover:bg-red-700">Confirmar</button>
                </div>
            </div>
        </div>
    </div>

    <script>
        // Database setup
        let db;
        const DB_NAME = "PharmaManagerDB";
        const DB_VERSION = 1;
        
        // Open or create database
        const request = indexedDB.open(DB_NAME, DB_VERSION);

        request.onupgradeneeded = (event) => {
            db = event.target.result;
            
            // Create customers store
            if (!db.objectStoreNames.contains('customers')) {
                const customersStore = db.createObjectStore('customers', { keyPath: 'id', autoIncrement: true });
                customersStore.createIndex('name', 'name', { unique: false });
                customersStore.createIndex('cpf', 'cpf', { unique: true });
                customersStore.createIndex('phone', 'phone', { unique: false });
            }
            
            // Create products store
            if (!db.objectStoreNames.contains('products')) {
                const productsStore = db.createObjectStore('products', { keyPath: 'id', autoIncrement: true });
                productsStore.createIndex('name', 'name', { unique: false });
                productsStore.createIndex('barcode', 'barcode', { unique: true });
            }
            
            // Create sales store
            if (!db.objectStoreNames.contains('sales')) {
                const salesStore = db.createObjectStore('sales', { keyPath: 'id', autoIncrement: true });
                salesStore.createIndex('customerId', 'customerId', { unique: false });
                salesStore.createIndex('date', 'date', { unique: false });
            }
            
            // Create backups store
            if (!db.objectStoreNames.contains('backups')) {
                db.createObjectStore('backups', { keyPath: 'id', autoIncrement: true });
            }
        };

        request.onsuccess = (event) => {
            db = event.target.result;
            console.log("Database opened successfully");
            updateDashboardCounts();
            loadCustomers();
            loadBackups();
        };

        request.onerror = (event) => {
            console.error("Database error:", event.target.error);
        };

        // UI Functions
        document.addEventListener('DOMContentLoaded', () => {
            // Mobile menu toggle
            const mobileMenuBtn = document.querySelector('.mobile-menu-btn');
            const sidebar = document.querySelector('.sidebar');
            const mainContent = document.querySelector('.main-content');
            
            mobileMenuBtn.addEventListener('click', () => {
                sidebar.classList.toggle('hidden');
            });

            // Navigation
            document.getElementById('customer-nav').addEventListener('click', () => {
                showSection('customer-content', 'Clientes');
                loadCustomers();
            });

            document.getElementById('backup-nav').addEventListener('click', () => {
                showSection('backup-content', 'Backup/Restore');
                loadBackups();
            });

            // Customer management
            document.getElementById('add-customer-btn').addEventListener('click', () => {
                openCustomerModal();
            });

            document.getElementById('close-modal').addEventListener('click', () => {
                closeCustomerModal();
            });

            document.getElementById('cancel-customer').addEventListener('click', () => {
                closeCustomerModal();
            });

            document.getElementById('customer-form').addEventListener('submit', (e) => {
                e.preventDefault();
                saveCustomer();
            });

            // Backup functionality
            document.getElementById('create-backup-btn').addEventListener('click', () => {
                createBackup();
            });

            document.getElementById('restore-backup-btn').addEventListener('click', () => {
                restoreBackup();
            });

            // Initialize dashboard
            showSection('dashboard-content', 'Dashboard');
        });

        function showSection(sectionId, title) {
            // Hide all sections
            document.querySelectorAll('[id$="-content"]').forEach(section => {
                section.classList.add('hidden');
            });
            
            // Show selected section
            document.getElementById(sectionId).classList.remove('hidden');
            
            // Update page title
            document.getElementById('page-title').textContent = title;
        }

        // Customer functions
        function loadCustomers(page = 1, search = '') {
            const transaction = db.transaction(['customers'], 'readonly');
            const store = transaction.objectStore('customers');
            const request = store.getAll();
            
            request.onsuccess = () => {
                const customers = request.result;
                let filteredCustomers = customers;
                
                // Apply search filter
                if (search) {
                    const searchTerm = search.toLowerCase();
                    filteredCustomers = customers.filter(customer => 
                        customer.name.toLowerCase().includes(searchTerm) ||
                        customer.cpf.includes(searchTerm) ||
                        customer.phone.includes(searchTerm) ||
                        (customer.email && customer.email.toLowerCase().includes(searchTerm))
                    );
                }
                
                // Pagination
                const itemsPerPage = 10;
                const startIndex = (page - 1) * itemsPerPage;
                const endIndex = startIndex + itemsPerPage;
                const paginatedCustomers = filteredCustomers.slice(startIndex, endIndex);
                const totalPages = Math.ceil(filteredCustomers.length / itemsPerPage);
                
                // Update table
                const tbody = document.getElementById('customer-table-body');
                tbody.innerHTML = '';
                
                if (paginatedCustomers.length === 0) {
                    const row = document.createElement('tr');
                    row.innerHTML = `<td colspan="6" class="px-6 py-4 text-center text-gray-500">Nenhum cliente encontrado</td>`;
                    tbody.appendChild(row);
                } else {
                    paginatedCustomers.forEach(customer => {
                        const row = document.createElement('tr');
                        row.innerHTML = `
                            <td class="px-6 py-4 whitespace-nowrap">${customer.id}</td>
                            <td class="px-6 py-4 whitespace-nowrap">${customer.name}</td>
                            <td class="px-6 py-4 whitespace-nowrap">${formatCPF(customer.cpf)}</td>
                            <td class="px-6 py-4 whitespace-nowrap">${formatPhone(customer.phone)}</td>
                            <td class="px-6 py-4 whitespace-nowrap">${customer.email || '-'}</td>
                            <td class="px-6 py-4 whitespace-nowrap">
                                <button class="edit-customer text-blue-600 hover:text-blue-800 mr-3" data-id="${customer.id}">
                                    <i class="fas fa-edit"></i>
                                </button>
                                <button class="delete-customer text-red-600 hover:text-red-800" data-id="${customer.id}">
                                    <i class="fas fa-trash"></i>
                                </button>
                            </td>
                        `;
                        tbody.appendChild(row);
                    });
                    
                    // Add event listeners to edit/delete buttons
                    document.querySelectorAll('.edit-customer').forEach(btn => {
                        btn.addEventListener('click', (e) => {
                            const id = parseInt(e.currentTarget.getAttribute('data-id'));
                            editCustomer(id);
                        });
                    });
                    
                    document.querySelectorAll('.delete-customer').forEach(btn => {
                        btn.addEventListener('click', (e) => {
                            const id = parseInt(e.currentTarget.getAttribute('data-id'));
                            confirmDeleteCustomer(id);
                        });
                    });
                }
                
                // Update pagination info
                document.getElementById('customer-start').textContent = startIndex + 1;
                document.getElementById('customer-end').textContent = Math.min(endIndex, filteredCustomers.length);
                document.getElementById('customer-total').textContent = filteredCustomers.length;
                
                // Update pagination buttons
                const prevBtn = document.getElementById('customer-prev');
                const nextBtn = document.getElementById('customer-next');
                
                prevBtn.disabled = page <= 1;
                nextBtn.disabled = page >= totalPages;
                
                prevBtn.onclick = () => loadCustomers(page - 1, search);
                nextBtn.onclick = () => loadCustomers(page + 1, search);
            };
            
            request.onerror = () => {
                console.error("Error loading customers");
            };
        }

        function openCustomerModal(customer = null) {
            const modal = document.getElementById('customer-modal');
            const form = document.getElementById('customer-form');
            
            if (customer) {
                document.getElementById('modal-title').textContent = 'Editar Cliente';
                document.getElementById('customer-id').value = customer.id;
                document.getElementById('customer-name').value = customer.name;
                document.getElementById('customer-cpf').value = customer.cpf;
                document.getElementById('customer-phone').value = customer.phone;
                document.getElementById('customer-email').value = customer.email || '';
                document.getElementById('customer-address').value = customer.address || '';
                document.getElementById('customer-city').value = customer.city || '';
                document.getElementById('customer-state').value = customer.state || '';
                document.getElementById('customer-zip').value = customer.zip || '';
            } else {
                document.getElementById('modal-title').textContent = 'Adicionar Novo Cliente';
                form.reset();
            }
            
            modal.classList.remove('hidden');
        }

        function closeCustomerModal() {
            document.getElementById('customer-modal').classList.add('hidden');
        }

        function saveCustomer() {
            const id = document.getElementById('customer-id').value;
            const customer = {
                name: document.getElementById('customer-name').value.trim(),
                cpf: document.getElementById('customer-cpf').value.replace(/\D/g, ''),
                phone: document.getElementById('customer-phone').value.replace(/\D/g, ''),
                email: document.getElementById('customer-email').value.trim() || null,
                address: document.getElementById('customer-address').value.trim() || null,
                city: document.getElementById('customer-city').value.trim() || null,
                state: document.getElementById('customer-state').value.trim() || null,
                zip: document.getElementById('customer-zip').value.replace(/\D/g, '') || null
            };
            
            if (!customer.name || !customer.cpf || !customer.phone) {
                showToast('Por favor, preencha os campos obrigatórios', 'error');
                return;
            }
            
            const transaction = db.transaction(['customers'], 'readwrite');
            const store = transaction.objectStore('customers');
            
            if (id) {
                customer.id = parseInt(id);
                const request = store.put(customer);
                
                request.onsuccess = () => {
                    showToast('Cliente atualizado com sucesso!');
                    closeCustomerModal();
                    loadCustomers();
                    updateDashboardCounts();
                };
                
                request.onerror = () => {
                    showToast('Erro ao atualizar cliente', 'error');
                };
            } else {
                const request = store.add(customer);
                
                request.onsuccess = () => {
                    showToast('Cliente cadastrado com sucesso!');
                    closeCustomerModal();
                    loadCustomers();
                    updateDashboardCounts();
                };
                
                request.onerror = (e) => {
                    if (e.target.error.name === 'ConstraintError') {
                        showToast('CPF já cadastrado', 'error');
                    } else {
                        showToast('Erro ao cadastrar cliente', 'error');
                    }
                };
            }
        }

        function editCustomer(id) {
            const transaction = db.transaction(['customers'], 'readonly');
            const store = transaction.objectStore('customers');
            const request = store.get(id);
            
            request.onsuccess = () => {
                openCustomerModal(request.result);
            };
            
            request.onerror = () => {
                showToast('Erro ao carregar cliente', 'error');
            };
        }

        function confirmDeleteCustomer(id) {
            const modal = document.getElementById('confirm-modal');
            document.getElementById('confirm-title').textContent = 'Excluir Cliente';
            document.getElementById('confirm-message').textContent = 'Tem certeza que deseja excluir este cliente? Esta ação não pode ser desfeita.';
            
            document.getElementById('confirm-action').onclick = () => {
                deleteCustomer(id);
                modal.classList.add('hidden');
            };
            
            modal.classList.remove('hidden');
        }

        function deleteCustomer(id) {
            const transaction = db.transaction(['customers'], 'readwrite');
            const store = transaction.objectStore('customers');
            const request = store.delete(id);
            
            request.onsuccess = () => {
                showToast('Cliente excluído com sucesso!');
                loadCustomers();
                updateDashboardCounts();
            };
            
            request.onerror = () => {
                showToast('Erro ao excluir cliente', 'error');
            };
        }

        // Backup functions
        function createBackup() {
            // Get all data from the database
            const transaction = db.transaction(['customers', 'products', 'sales'], 'readonly');
            
            const customersRequest = transaction.objectStore('customers').getAll();
            const productsRequest = transaction.objectStore('products').getAll();
            const salesRequest = transaction.objectStore('sales').getAll();
            
            Promise.all([
                new Promise(resolve => { customersRequest.onsuccess = () => resolve(customersRequest.result); }),
                new Promise(resolve => { productsRequest.onsuccess = () => resolve(productsRequest.result); }),
                new Promise(resolve => { salesRequest.onsuccess = () => resolve(salesRequest.result); })
            ]).then(([customers, products, sales]) => {
                const backupData = {
                    timestamp: new Date().getTime(),
                    date: new Date().toISOString(),
                    customers,
                    products,
                    sales
                };
                
                // Save backup to IndexedDB
                const backupTransaction = db.transaction(['backups'], 'readwrite');
                const backupStore = backupTransaction.objectStore('backups');
                backupStore.add(backupData);
                
                backupTransaction.oncomplete = () => {
                    showToast('Backup criado com sucesso!');
                    loadBackups();
                    
                    // Create download link
                    const dataStr = JSON.stringify(backupData);
                    const dataUri = 'data:application/json;charset=utf-8,'+ encodeURIComponent(dataStr);
                    
                    const exportName = `pharmamanager_backup_${new Date().toISOString().slice(0, 10)}.json`;
                    
                    const linkElement = document.createElement('a');
                    linkElement.setAttribute('href', dataUri);
                    linkElement.setAttribute('download', exportName);
                    linkElement.click();
                };
                
                backupTransaction.onerror = () => {
                    showToast('Erro ao salvar backup local', 'error');
                };
            }).catch(error => {
                console.error("Backup error:", error);
                showToast('Erro ao criar backup', 'error');
            });
        }

        function restoreBackup() {
            const fileInput = document.getElementById('restore-file');
            const file = fileInput.files[0];
            
            if (!file) {
                showToast('Selecione um arquivo de backup', 'error');
                return;
            }
            
            const reader = new FileReader();
            reader.onload = (event) => {
                try {
                    const backupData = JSON.parse(event.target.result);
                    
                    // Confirm restore
                    const modal = document.getElementById('confirm-modal');
                    document.getElementById('confirm-title').textContent = 'Restaurar Backup';
                    document.getElementById('confirm-message').textContent = `Tem certeza que deseja restaurar o backup de ${new Date(backupData.timestamp).toLocaleString()}? Todos os dados atuais serão substituídos.`;
                    
                    document.getElementById('confirm-action').onclick = () => {
                        performRestore(backupData);
                        modal.classList.add('hidden');
                    };
                    
                    modal.classList.remove('hidden');
                } catch (e) {
                    console.error("Error parsing backup file:", e);
                    showToast('Arquivo de backup inválido', 'error');
                }
            };
            reader.readAsText(file);
        }

        function performRestore(backupData) {
            // Start a transaction for all object stores
            const transaction = db.transaction(['customers', 'products', 'sales', 'backups'], 'readwrite');
            
            // Clear existing data
            transaction.objectStore('customers').clear();
            transaction.objectStore('products').clear();
            transaction.objectStore('sales').clear();
            
            // Add backup data
            backupData.customers.forEach(customer => {
                transaction.objectStore('customers').add(customer);
            });
            
            backupData.products.forEach(product => {
                transaction.objectStore('products').add(product);
            });
            
            backupData.sales.forEach(sale => {
                transaction.objectStore('sales').add(sale);
            });
            
            // Add to backups list
            transaction.objectStore('backups').add(backupData);
            
            transaction.oncomplete = () => {
                showToast('Backup restaurado com sucesso!');
                loadCustomers();
                updateDashboardCounts();
                loadBackups();
            };
            
            transaction.onerror = () => {
                showToast('Erro ao restaurar backup', 'error');
            };
        }

        function loadBackups() {
            const transaction = db.transaction(['backups'], 'readonly');
            const store = transaction.objectStore('backups');
            const request = store.getAll();
            
            request.onsuccess = () => {
                const backups = request.result;
                const tbody = document.getElementById('backup-list');
                tbody.innerHTML = '';
                
                if (backups.length === 0) {
                    const row = document.createElement('tr');
                    row.innerHTML = `<td colspan="3" class="px-6 py-4 text-center text-gray-500">Nenhum backup disponível</td>`;
                    tbody.appendChild(row);
                } else {
                    // Sort by timestamp (newest first)
                    backups.sort((a, b) => b.timestamp - a.timestamp);
                    
                    backups.forEach(backup => {
                        const date = new Date(backup.timestamp);
                        const size = JSON.stringify(backup).length;
                        const sizeKB = (size / 1024).toFixed(2);
                        
                        const row = document.createElement('tr');
                        row.innerHTML = `
                            <td class="px-6 py-4 whitespace-nowrap">${date.toLocaleString()}</td>
                            <td class="px-6 py-4 whitespace-nowrap">${sizeKB} KB</td>
                            <td class="px-6 py-4 whitespace-nowrap">
                                <button class="download-backup text-blue-600 hover:text-blue-800 mr-3" data-id="${backup.id}">
                                    <i class="fas fa-download"></i> Download
                                </button>
                                <button class="restore-from-list text-green-600 hover:text-green-800" data-id="${backup.id}">
                                    <i class="fas fa-redo"></i> Restaurar
                                </button>
                            </td>
                        `;
                        tbody.appendChild(row);
                    });
                    
                    // Add event listeners
                    document.querySelectorAll('.download-backup').forEach(btn => {
                        btn.addEventListener('click', (e) => {
                            const id = parseInt(e.currentTarget.getAttribute('data-id'));
                            downloadBackup(id);
                        });
                    });
                    
                    document.querySelectorAll('.restore-from-list').forEach(btn => {
                        btn.addEventListener('click', (e) => {
                            const id = parseInt(e.currentTarget.getAttribute('data-id'));
                            confirmRestoreBackup(id);
                        });
                    });
                }
            };
        }

        function downloadBackup(id) {
            const transaction = db.transaction(['backups'], 'readonly');
            const store = transaction.objectStore('backups');
            const request = store.get(id);
            
            request.onsuccess = () => {
                const backupData = request.result;
                const dataStr = JSON.stringify(backupData);
                const dataUri = 'data:application/json;charset=utf-8,'+ encodeURIComponent(dataStr);
                
                const exportName = `pharmamanager_backup_${new Date(backupData.timestamp).toISOString().slice(0, 10)}.json`;
                
                const linkElement = document.createElement('a');
                linkElement.setAttribute('href', dataUri);
                linkElement.setAttribute('download', exportName);
                linkElement.click();
                
                showToast('Download do backup iniciado');
            };
        }

        function confirmRestoreBackup(id) {
            const modal = document.getElementById('confirm-modal');
            document.getElementById('confirm-title').textContent = 'Restaurar Backup';
            document.getElementById('confirm-message').textContent = 'Tem certeza que deseja restaurar este backup? Todos os dados atuais serão substituídos.';
            
            document.getElementById('confirm-action').onclick = () => {
                restoreFromBackup(id);
                modal.classList.add('hidden');
            };
            
            modal.classList.remove('hidden');
        }

        function restoreFromBackup(id) {
            const transaction = db.transaction(['backups'], 'readonly');
            const store = transaction.objectStore('backups');
            const request = store.get(id);
            
            request.onsuccess = () => {
                performRestore(request.result);
            };
            
            request.onerror = () => {
                showToast('Erro ao carregar backup', 'error');
            };
        }

        // Dashboard functions
        function updateDashboardCounts() {
            // Customer count
            const customerTransaction = db.transaction(['customers'], 'readonly');
            const customerStore = customerTransaction.objectStore('customers');
            const customerCountRequest = customerStore.count();
            
            customerCountRequest.onsuccess = () => {
                document.getElementById('customer-count').textContent = customerCountRequest.result;
            };
            
            // Product count
            const productTransaction = db.transaction(['products'], 'readonly');
            const productStore = productTransaction.objectStore('products');
            const productCountRequest = productStore.count();
            
            productCountRequest.onsuccess = () => {
                document.getElementById('product-count').textContent = productCountRequest.result;
            };
            
            // Sales today
            const salesTransaction = db.transaction(['sales'], 'readonly');
            const salesStore = salesTransaction.objectStore('sales');
            const today = new Date().toISOString().slice(0, 10);
            const salesTodayRequest = salesStore.index('date').getAll(today);
            
            salesTodayRequest.onsuccess = () => {
                document.getElementById('sales-today').textContent = salesTodayRequest.result.length;
            };
            
            // Monthly revenue (placeholder - would need actual sales data with amounts)
            document.getElementById('monthly-revenue').textContent = 'R$ 0,00';
        }

        // Utility functions
        function showToast(message, type = 'success') {
            const toast = document.getElementById('toast');
            const toastMessage = document.getElementById('toast-message');
            
            toastMessage.textContent = message;
            
            // Set color based on type
            if (type === 'error') {
                toast.classList.remove('bg-green-500');
                toast.classList.add('bg-red-500');
            } else {
                toast.classList.remove('bg-red-500');
                toast.classList.add('bg-green-500');
            }
            
            toast.classList.remove('hidden');
            
            // Hide after 3 seconds
            setTimeout(() => {
                toast.classList.add('hidden');
            }, 3000);
        }

        function formatCPF(cpf) {
            return cpf.replace(/(\d{3})(\d{3})(\d{3})(\d{2})/, '$1.$2.$3-$4');
        }

        function formatPhone(phone) {
            if (phone.length === 11) {
                return phone.replace(/(\d{2})(\d{5})(\d{4})/, '($1) $2-$3');
            } else if (phone.length === 10) {
                return phone.replace(/(\d{2})(\d{4})(\d{4})/, '($1) $2-$3');
            }
            return phone;
        }

        // Initialize search functionality
        document.getElementById('customer-search').addEventListener('input', (e) => {
            loadCustomers(1, e.target.value);
        });

        // Close modals when clicking outside
        window.addEventListener('click', (e) => {
            const customerModal = document.getElementById('customer-modal');
            if (e.target === customerModal) {
                closeCustomerModal();
            }
            
            const confirmModal = document.getElementById('confirm-modal');
            if (e.target === confirmModal) {
                confirmModal.classList.add('hidden');
            }
        });

        // Close confirm modal buttons
        document.getElementById('close-confirm').addEventListener('click', () => {
            document.getElementById('confirm-modal').classList.add('hidden');
        });

        document.getElementById('cancel-confirm').addEventListener('click', () => {
            document.getElementById('confirm-modal').classList.add('hidden');
        });
    </script>
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