document.addEventListener('DOMContentLoaded', function() {
    // Initialize variables
    let products = [];
    let rtrAmount = 0;
    let taxRate = 8.25;
    // DOM elements
    const productList = document.getElementById('productList');
    const addProductBtn = document.getElementById('addProductBtn');
    const rtrCheckbox = document.getElementById('rtrCheckbox');
    const rtrContainer = document.getElementById('rtrContainer');
    const rtrAmountInput = document.getElementById('rtrAmount');
    const taxRateInput = document.getElementById('taxRate');
    const generateBtn = document.getElementById('generateBtn');
    const downloadBtn = document.getElementById('downloadBtn');
    const resetBtn = document.getElementById('resetBtn');
    const receiptPreview = document.getElementById('receiptPreview');
    const storeNameInput = document.getElementById('storeName');
    const storeAddressInput = document.getElementById('storeAddress');
    const storeCityInput = document.getElementById('storeCity');
    const logoUpload = document.getElementById('logoUpload');
    const logoPreview = document.getElementById('logoPreview');

    // Event listeners
    addProductBtn.addEventListener('click', addProduct);
    rtrCheckbox.addEventListener('change', toggleRtr);
    rtrAmountInput.addEventListener('input', updateRtrAmount);
    taxRateInput.addEventListener('input', updateTaxRate);
    generateBtn.addEventListener('click', generateReceipt);
    downloadBtn.addEventListener('click', downloadPDF);
    resetBtn.addEventListener('click', resetForm);
    logoUpload.addEventListener('change', handleLogoUpload);

    // Handle logo upload
    function handleLogoUpload(event) {
        const file = event.target.files[0];
        if (file) {
            const reader = new FileReader();
            reader.onload = function(e) {
                logoPreview.src = e.target.result;
                logoPreview.classList.remove('hidden');
                updateReceipt();
            };
            reader.readAsDataURL(file);
        }
    }

    // Add product function
    function addProduct() {
        const productId = Date.now();
        const productItem = document.createElement('div');
        productItem.className = 'product-item';
        productItem.dataset.id = productId;
        productItem.innerHTML = `
            <input type="text" placeholder="Product Name" class="product-name px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500">
            <input type="number" placeholder="Price" step="0.01" min="0" class="product-price px-3 py-2 border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500">
            <button class="remove-product px-2 py-1 text-red-500 hover:text-red-700">
                <i data-feather="trash-2"></i>
            </button>
        `;
        productList.appendChild(productItem);
        feather.replace();

        // Add event listener to remove button
        const removeBtn = productItem.querySelector('.remove-product');
        removeBtn.addEventListener('click', () => {
            productList.removeChild(productItem);
            updateReceipt();
        });

        // Add event listeners to inputs
        const nameInput = productItem.querySelector('.product-name');
        const priceInput = productItem.querySelector('.product-price');
        
        nameInput.addEventListener('input', updateReceipt);
        priceInput.addEventListener('input', updateReceipt);
    }

    // Toggle RTR payment
    function toggleRtr() {
        rtrContainer.classList.toggle('hidden', !rtrCheckbox.checked);
        if (!rtrCheckbox.checked) {
            rtrAmount = 0;
            rtrAmountInput.value = '';
        }
        updateReceipt();
    }

    // Update RTR amount
    function updateRtrAmount() {
        rtrAmount = parseFloat(rtrAmountInput.value) || 0;
        updateReceipt();
    }

    // Update tax rate
    function updateTaxRate() {
        taxRate = parseFloat(taxRateInput.value) || 0;
        updateReceipt();
    }

    // Generate receipt preview
    function updateReceipt() {
        // Get all products
        products = [];
        const productItems = document.querySelectorAll('.product-item');
        productItems.forEach(item => {
            const name = item.querySelector('.product-name').value;
            const price = parseFloat(item.querySelector('.product-price').value) || 0;
            if (name && price > 0) {
                products.push({ name, price });
            }
        });

        // Calculate totals
        const subtotal = products.reduce((sum, product) => sum + product.price, 0);
        const taxableAmount = rtrCheckbox.checked ? subtotal : subtotal + rtrAmount;
        const tax = taxableAmount * (taxRate / 100);
        const total = subtotal + tax + (rtrCheckbox.checked ? rtrAmount : 0);

        // Format current date and time
        const now = new Date();
        const date = now.toLocaleDateString('en-US', { month: '2-digit', day: '2-digit', year: 'numeric' });
        const time = now.toLocaleTimeString('en-US', { hour: '2-digit', minute: '2-digit', second: '2-digit' });

        // Generate receipt HTML
        let receiptHTML = '';
        
        // Add logo if uploaded
        if (logoPreview.src && !logoPreview.classList.contains('hidden')) {
            receiptHTML += `<div class="logo-container"><img src="${logoPreview.src}" alt="Logo" class="logo"></div>\n`;
        }
        
        receiptHTML += `
            <div class="header">
                ${storeNameInput.value || 'BOOST MOBILE'}\n
                ${storeAddressInput.value || '22424 IMPERIAL VALLEY DR'}\n
                ${storeCityInput.value || 'HOUSTON, TX 77073'}\n
                \n
                DATE: ${date}   TIME: ${time}\n
                \n
                ITEM DESCRIPTION          AMOUNT\n
                ----------------------------------------\n
        `;

        // Add products
        products.forEach(product => {
            const name = product.name.length > 20 ? product.name.substring(0, 17) + '...' : product.name;
            const price = product.price.toFixed(2).padStart(8);
            receiptHTML += `${name.padEnd(25)} ${price}\n`;
        });

        // Add RTR payment if checked
        if (rtrCheckbox.checked && rtrAmount > 0) {
            receiptHTML += `\nBoost RTR $5-500${' '.repeat(12)} ${rtrAmount.toFixed(2).padStart(8)}\n`;
            receiptHTML += `(No Tax)${' '.repeat(25)}\n`;
        }

        // Add totals
        receiptHTML += `
            \n
            ----------------------------------------\n
            SUBTOTAL${' '.repeat(19)} ${subtotal.toFixed(2).padStart(8)}\n
            TAX${' '.repeat(24)} ${tax.toFixed(2).padStart(8)}\n
            TOTAL${' '.repeat(22)} ${total.toFixed(2).padStart(8)}\n
            \n
            \n
            THANK YOU FOR YOUR BUSINESS\n
            PAYMENT PROCESSED SUCCESSFULLY\n
            \n
            \n
            NO RETURNS - ALL SALES ARE FINAL.\n
            EXCHANGES MAY BE MADE WITHIN 7 DAYS\n
            OF PURCHASE.\n
            APPROVED RETURNS WILL RECEIVE A\n
            REFUND EXCLUDING CHARGES INCURRED\n
            FOR WIRELESS SERVICE, ACCESSORIES,\n
            AND ADD-ONS.\n
            RETURNS MAY BE SUBJECT TO UP TO 20%\n
            RESTOCKING FEE.\n
        `;

        receiptPreview.innerHTML = receiptHTML;
        downloadBtn.disabled = false;
    }

    // Generate PDF receipt
    function generateReceipt() {
        updateReceipt();
        downloadBtn.disabled = false;
    }
    
    // Download PDF
    function downloadPDF() {
        const { jsPDF } = window.jspdf;
        const doc = new jsPDF({
            orientation: 'portrait',
            unit: 'mm',
            format: [80, 297]
        });

        // Get receipt content
        const receiptContent = receiptPreview.textContent;
        
        // Set font and add text
        doc.setFont('courier');
        doc.setFontSize(8); // Smaller font for thermal receipt
        
        // Split content into lines and add to PDF
        const lines = receiptContent.split('\n');
        let y = 10;
        const lineHeight = 5;
        const marginLeft = 5;
        
        lines.forEach(line => {
            // Handle long lines by splitting them
            if (doc.getStringUnitWidth(line) * doc.internal.scaleFactor > 70) {
                const chunks = [];
                let tempLine = line;
                
                while (doc.getStringUnitWidth(tempLine) * doc.internal.scaleFactor > 70) {
                    let chunk = tempLine.substring(0, 40);
                    tempLine = tempLine.substring(40);
                    chunks.push(chunk);
                }
                chunks.push(tempLine);
                
                chunks.forEach(chunk => {
                    doc.text(chunk, marginLeft, y);
                    y += lineHeight;
                });
            } else {
                doc.text(line, marginLeft, y);
                y += lineHeight;
            }
        });

        // Save the PDF
        doc.save('boost_receipt.pdf');
    }
    
    // Reset form
    function resetForm() {
        productList.innerHTML = '';
        products = [];
        rtrCheckbox.checked = false;
        rtrContainer.classList.add('hidden');
        rtrAmount = 0;
        rtrAmountInput.value = '';
        taxRateInput.value = '8.25';
        taxRate = 8.25;
        storeNameInput.value = 'BOOST MOBILE';
        storeAddressInput.value = '22424 IMPERIAL VALLEY DR';
        storeCityInput.value = 'HOUSTON, TX 77073';
        logoUpload.value = '';
        logoPreview.classList.add('hidden');
        receiptPreview.innerHTML = '';
        downloadBtn.disabled = true;
    }

    // Initialize with one product
    addProduct();
});