// Global state
let customers = [];
let quotes = [];
let currentQuoteId = null;
let currentCustomerId = null;
let itemCounter = 0;
let currentLogoFile = null;

// Initialize app
document.addEventListener('DOMContentLoaded', () => {
    loadCustomers();
    loadQuotes();
    setDefaultDate();
    checkCurrentLogo();
    
    // Setup form handlers
    document.getElementById('customer-form').addEventListener('submit', handleCustomerSubmit);
    document.getElementById('quote-form').addEventListener('submit', handleQuoteSubmit);
    document.getElementById('quote-tax-exempt').addEventListener('change', updateTotals);
    
    // Setup logo upload handler
    document.getElementById('logo-upload').addEventListener('change', (e) => {
        const file = e.target.files[0];
        if (file) {
            currentLogoFile = file;
            document.getElementById('logo-filename').textContent = file.name;
            document.getElementById('upload-btn').disabled = false;
        }
    });
});

// Tab Management
function showTab(tabName) {
    document.querySelectorAll('.tab-content').forEach(tab => tab.classList.add('hidden'));
    document.querySelectorAll('.tab-btn').forEach(btn => btn.classList.remove('bg-blue-800'));
    
    document.getElementById(`${tabName}-tab`).classList.remove('hidden');
    document.getElementById(`tab-${tabName}`).classList.add('bg-blue-800');
    
    if (tabName === 'quotes') {
        loadQuotes();
    } else if (tabName === 'customers') {
        loadCustomers();
    } else if (tabName === 'settings') {
        checkCurrentLogo();
    }
}

// Logo Management
async function checkCurrentLogo() {
    try {
        const response = await fetch('/api/logo-info');
        if (response.ok) {
            const data = await response.json();
            if (data.hasLogo) {
                document.getElementById('logo-preview').classList.remove('hidden');
                document.getElementById('logo-image').src = data.logoPath + '?t=' + Date.now();
            }
        }
    } catch (error) {
        console.error('Error checking logo:', error);
    }
}

async function uploadLogo() {
    if (!currentLogoFile) {
        alert('Please select a file first');
        return;
    }
    
    const formData = new FormData();
    formData.append('logo', currentLogoFile);
    
    const statusDiv = document.getElementById('upload-status');
    statusDiv.innerHTML = '<p class="text-blue-600">Uploading...</p>';
    
    try {
        const response = await fetch('/api/upload-logo', {
            method: 'POST',
            body: formData
        });
        
        if (response.ok) {
            const data = await response.json();
            statusDiv.innerHTML = '<p class="text-green-600">✓ Logo uploaded successfully!</p>';
            document.getElementById('logo-preview').classList.remove('hidden');
            document.getElementById('logo-image').src = data.path + '?t=' + Date.now();
            document.getElementById('upload-btn').disabled = true;
            currentLogoFile = null;
            document.getElementById('logo-filename').textContent = '';
            document.getElementById('logo-upload').value = '';
        } else {
            const error = await response.json();
            statusDiv.innerHTML = `<p class="text-red-600">✗ Error: ${error.error}</p>`;
        }
    } catch (error) {
        console.error('Upload error:', error);
        statusDiv.innerHTML = '<p class="text-red-600">✗ Upload failed</p>';
    }
}

// Customers
async function loadCustomers() {
    try {
        const response = await fetch('/api/customers');
        customers = await response.json();
        renderCustomers();
        updateCustomerDropdown();
    } catch (error) {
        console.error('Error loading customers:', error);
        alert('Error loading customers');
    }
}

function renderCustomers() {
    const tbody = document.getElementById('customers-list');
    tbody.innerHTML = customers.map(customer => `
        <tr>
            <td class="px-6 py-4 whitespace-nowrap text-sm font-medium text-gray-900">${customer.name}</td>
            <td class="px-6 py-4 text-sm text-gray-500">${customer.street}, ${customer.city}, ${customer.state} ${customer.zip_code}</td>
            <td class="px-6 py-4 whitespace-nowrap text-sm text-gray-500">${customer.account_number || '-'}</td>
            <td class="px-6 py-4 whitespace-nowrap text-sm font-medium space-x-2">
                <button onclick="editCustomer(${customer.id})" class="text-blue-600 hover:text-blue-900">Edit</button>
                <button onclick="deleteCustomer(${customer.id})" class="text-red-600 hover:text-red-900">Delete</button>
            </td>
        </tr>
    `).join('');
}

function updateCustomerDropdown() {
    const select = document.getElementById('quote-customer');
    select.innerHTML = '<option value="">Select Customer...</option>' +
        customers.map(c => `<option value="${c.id}">${c.name}</option>`).join('');
}

function openCustomerModal(customerId = null) {
    currentCustomerId = customerId;
    const modal = document.getElementById('customer-modal');
    const title = document.getElementById('customer-modal-title');
    
    if (customerId) {
        title.textContent = 'Edit Customer';
        const customer = customers.find(c => c.id === customerId);
        document.getElementById('customer-id').value = customer.id;
        document.getElementById('customer-name').value = customer.name;
        document.getElementById('customer-street').value = customer.street;
        document.getElementById('customer-city').value = customer.city;
        document.getElementById('customer-state').value = customer.state;
        document.getElementById('customer-zip').value = customer.zip_code;
        document.getElementById('customer-account').value = customer.account_number || '';
    } else {
        title.textContent = 'New Customer';
        document.getElementById('customer-form').reset();
        document.getElementById('customer-id').value = '';
    }
    
    modal.classList.add('active');
}

function closeCustomerModal() {
    document.getElementById('customer-modal').classList.remove('active');
    currentCustomerId = null;
}

async function handleCustomerSubmit(e) {
    e.preventDefault();
    
    const data = {
        name: document.getElementById('customer-name').value,
        street: document.getElementById('customer-street').value,
        city: document.getElementById('customer-city').value,
        state: document.getElementById('customer-state').value.toUpperCase(),
        zip_code: document.getElementById('customer-zip').value,
        account_number: document.getElementById('customer-account').value
    };
    
    try {
        const customerId = document.getElementById('customer-id').value;
        const url = customerId ? `/api/customers/${customerId}` : '/api/customers';
        const method = customerId ? 'PUT' : 'POST';
        
        const response = await fetch(url, {
            method,
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(data)
        });
        
        if (response.ok) {
            closeCustomerModal();
            loadCustomers();
        } else {
            alert('Error saving customer');
        }
    } catch (error) {
        console.error('Error:', error);
        alert('Error saving customer');
    }
}

async function editCustomer(id) {
    openCustomerModal(id);
}

async function deleteCustomer(id) {
    if (!confirm('Are you sure you want to delete this customer?')) return;
    
    try {
        const response = await fetch(`/api/customers/${id}`, { method: 'DELETE' });
        if (response.ok) {
            loadCustomers();
        } else {
            alert('Error deleting customer');
        }
    } catch (error) {
        console.error('Error:', error);
        alert('Error deleting customer');
    }
}

// Quotes
async function loadQuotes() {
    try {
        const response = await fetch('/api/quotes');
        quotes = await response.json();
        renderQuotes();
    } catch (error) {
        console.error('Error loading quotes:', error);
        alert('Error loading quotes');
    }
}

function renderQuotes() {
    const tbody = document.getElementById('quotes-list');
    tbody.innerHTML = quotes.map(quote => {
        const total = quote.has_tbd ? `$${parseFloat(quote.total).toFixed(2)}*` : `$${parseFloat(quote.total).toFixed(2)}`;
        return `
            <tr>
                <td class="px-6 py-4 whitespace-nowrap text-sm font-medium text-gray-900">${quote.quote_number}</td>
                <td class="px-6 py-4 text-sm text-gray-500">${quote.customer_name || 'N/A'}</td>
                <td class="px-6 py-4 whitespace-nowrap text-sm text-gray-500">${formatDate(quote.quote_date)}</td>
                <td class="px-6 py-4 whitespace-nowrap text-sm text-gray-900 font-semibold">${total}</td>
                <td class="px-6 py-4 whitespace-nowrap text-sm font-medium space-x-2">
                    <button onclick="viewQuotePDF(${quote.id})" class="text-green-600 hover:text-green-900">PDF</button>
                    <button onclick="editQuote(${quote.id})" class="text-blue-600 hover:text-blue-900">Edit</button>
                    <button onclick="deleteQuote(${quote.id})" class="text-red-600 hover:text-red-900">Delete</button>
                </td>
            </tr>
        `;
    }).join('');
}

async function openQuoteModal(quoteId = null) {
    currentQuoteId = quoteId;
    const modal = document.getElementById('quote-modal');
    const title = document.getElementById('quote-modal-title');
    
    if (quoteId) {
        title.textContent = 'Edit Quote';
        const response = await fetch(`/api/quotes/${quoteId}`);
        const quote = await response.json();
        
        document.getElementById('quote-id').value = quote.id;
        document.getElementById('quote-customer').value = quote.customer_id;
        document.getElementById('quote-number').value = quote.quote_number;
        // Convert date from YYYY-MM-DD format (may include time)
        const dateOnly = quote.quote_date.split('T')[0];
        document.getElementById('quote-date').value = dateOnly;
        document.getElementById('quote-tax-exempt').checked = quote.tax_exempt;
        document.getElementById('quote-tbd-note').value = quote.tbd_note || '';
        
        // Load items
        document.getElementById('quote-items').innerHTML = '';
        itemCounter = 0;
        quote.items.forEach(item => {
            addQuoteItem(item);
        });
        
        updateTotals();
    } else {
        title.textContent = 'New Quote';
        document.getElementById('quote-form').reset();
        document.getElementById('quote-id').value = '';
        document.getElementById('quote-items').innerHTML = '';
        itemCounter = 0;
        setDefaultDate();
        
        // Get next quote number
        const response = await fetch('/api/quotes/next-number');
        const data = await response.json();
        document.getElementById('quote-number').value = data.quote_number;
        
        // Add one default item
        addQuoteItem();
    }
    
    modal.classList.add('active');
}

function closeQuoteModal() {
    document.getElementById('quote-modal').classList.remove('active');
    currentQuoteId = null;
}

function addQuoteItem(item = null) {
    const itemId = itemCounter++;
    const itemsDiv = document.getElementById('quote-items');
    
    const itemDiv = document.createElement('div');
    itemDiv.className = 'border border-gray-300 rounded-lg mb-3';
    itemDiv.id = `item-${itemId}`;
    
    // Create summary text
    const summaryQty = item ? item.quantity : '';
    const summaryDesc = item ? (item.description.replace(/<[^>]*>/g, '').substring(0, 50) + '...') : 'New item';
    const summaryAmount = item ? item.amount : '';
    
    itemDiv.innerHTML = `
        <!-- Summary Header (always visible) -->
        <div class="item-header bg-gray-50 px-4 py-3 cursor-pointer flex items-center justify-between" onclick="toggleItem(${itemId})">
            <div class="flex items-center space-x-4 flex-1">
                <span class="text-sm font-medium text-gray-700">Qty: <span class="item-summary-qty">${summaryQty}</span></span>
                <span class="text-sm text-gray-600 flex-1 truncate item-summary-desc">${summaryDesc}</span>
                <span class="text-sm font-medium text-gray-900">$<span class="item-summary-amount">${summaryAmount}</span></span>
            </div>
            <div class="flex items-center space-x-2">
                <svg class="item-chevron w-5 h-5 text-gray-500 transition-transform" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                    <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M19 9l-7 7-7-7" />
                </svg>
            </div>
        </div>
        
        <!-- Expandable Content (hidden by default) -->
        <div class="item-content hidden">
            <div class="grid grid-cols-12 gap-3 items-start p-4">
                <div class="col-span-1">
                    <label class="block text-xs font-medium text-gray-700 mb-1">Qty</label>
                    <input type="text" data-item="${itemId}" data-field="quantity" 
                           value="${item ? item.quantity : ''}"
                           class="item-input w-full px-2 py-2 border border-gray-300 rounded-md text-sm focus:ring-blue-500 focus:border-blue-500">
                </div>
                <div class="col-span-5">
                    <label class="block text-xs font-medium text-gray-700 mb-1">Description</label>
                    <div data-item="${itemId}" data-field="description" 
                         class="item-description-editor border border-gray-300 rounded-md bg-white" 
                         style="min-height: 80px;">
                    </div>
                    <input type="hidden" data-item="${itemId}" data-field="description-html" class="item-description-html">
                </div>
                <div class="col-span-2">
                    <label class="block text-xs font-medium text-gray-700 mb-1">Rate</label>
                    <input type="text" data-item="${itemId}" data-field="rate" 
                           value="${item ? item.rate : ''}"
                           class="item-input w-full px-2 py-2 border border-gray-300 rounded-md text-sm focus:ring-blue-500 focus:border-blue-500">
                </div>
                <div class="col-span-2">
                    <label class="block text-xs font-medium text-gray-700 mb-1">Amount</label>
                    <input type="text" data-item="${itemId}" data-field="amount" 
                           value="${item ? item.amount : ''}"
                           class="item-amount w-full px-2 py-2 border border-gray-300 rounded-md text-sm focus:ring-blue-500 focus:border-blue-500">
                </div>
                <div class="col-span-1">
                    <label class="block text-xs font-medium text-gray-700 mb-1">TBD</label>
                    <input type="checkbox" data-item="${itemId}" data-field="is_tbd" 
                           ${item && item.is_tbd ? 'checked' : ''}
                           class="item-tbd h-5 w-5 mt-2 text-blue-600 focus:ring-blue-500 border-gray-300 rounded">
                </div>
                <div class="col-span-1 flex items-end">
                    <button type="button" onclick="removeQuoteItem(${itemId})" 
                            class="w-full px-2 py-2 bg-red-500 hover:bg-red-600 text-white rounded-md text-sm">
                        ×
                    </button>
                </div>
            </div>
        </div>
    `;
    
    itemsDiv.appendChild(itemDiv);
    
    // Initialize Quill editor for description
    const editorDiv = itemDiv.querySelector('.item-description-editor');
    const hiddenInput = itemDiv.querySelector('.item-description-html');
    
    const quill = new Quill(editorDiv, {
        theme: 'snow',
        modules: {
            toolbar: [
                ['bold', 'italic', 'underline'],
                [{ 'list': 'ordered'}, { 'list': 'bullet' }],
                ['clean']
            ]
        }
    });
    
    // Load existing content if editing
    if (item && item.description) {
        quill.root.innerHTML = item.description;
    }
    
    // Save HTML content on change
    quill.on('text-change', () => {
        hiddenInput.value = quill.root.innerHTML;
        updateItemSummary(itemId);
        updateTotals();
    });
    
    // Store quill instance for later access
    editorDiv.quillInstance = quill;
    
    // Get references to inputs for auto-calculation
    const qtyInput = itemDiv.querySelector('[data-field="quantity"]');
    const rateInput = itemDiv.querySelector('[data-field="rate"]');
    const amountInput = itemDiv.querySelector('[data-field="amount"]');
    const tbdCheckbox = itemDiv.querySelector('[data-field="is_tbd"]');
    
    // Auto-calculate amount when qty or rate changes
    const calculateAmount = () => {
        if (!tbdCheckbox.checked && qtyInput.value && rateInput.value) {
            const qty = parseFloat(qtyInput.value) || 0;
            // Extract numeric value from rate (handles "125.00/hr" format)
            const rateValue = parseFloat(rateInput.value.replace(/[^0-9.]/g, '')) || 0;
            const amount = qty * rateValue;
            amountInput.value = amount.toFixed(2);
        }
        updateItemSummary(itemId);
        updateTotals();
    };
    
    // Add event listeners for auto-calculation and summary update
    qtyInput.addEventListener('input', calculateAmount);
    rateInput.addEventListener('input', calculateAmount);
    amountInput.addEventListener('input', () => {
        updateItemSummary(itemId);
        updateTotals();
    });
    
    // Add event listeners for totals update
    itemDiv.querySelectorAll('.item-input, .item-amount').forEach(input => {
        input.addEventListener('input', updateTotals);
    });
    
    itemDiv.querySelector('.item-tbd').addEventListener('change', function() {
        const amountInput = itemDiv.querySelector('.item-amount');
        if (this.checked) {
            amountInput.value = 'TBD';
            amountInput.readOnly = true;
            amountInput.classList.add('bg-gray-100');
        } else {
            if (amountInput.value === 'TBD') {
                amountInput.value = '';
                calculateAmount(); // Recalculate when unchecking TBD
            }
            amountInput.readOnly = false;
            amountInput.classList.remove('bg-gray-100');
        }
        updateTotals();
    });
    
    // Trigger TBD state if loaded
    if (item && item.is_tbd) {
        itemDiv.querySelector('.item-tbd').dispatchEvent(new Event('change'));
    }
    
    updateTotals();
}

function removeQuoteItem(itemId) {
    document.getElementById(`item-${itemId}`).remove();
    updateTotals();
}

function toggleItem(itemId) {
    const itemDiv = document.getElementById(`item-${itemId}`);
    const content = itemDiv.querySelector('.item-content');
    const chevron = itemDiv.querySelector('.item-chevron');
    
    if (content.classList.contains('hidden')) {
        content.classList.remove('hidden');
        chevron.style.transform = 'rotate(180deg)';
    } else {
        content.classList.add('hidden');
        chevron.style.transform = 'rotate(0deg)';
    }
}

function updateItemSummary(itemId) {
    const itemDiv = document.getElementById(`item-${itemId}`);
    const qtyInput = itemDiv.querySelector('[data-field="quantity"]');
    const amountInput = itemDiv.querySelector('[data-field="amount"]');
    const descEditor = itemDiv.querySelector('.item-description-editor');
    
    // Update summary displays
    const summaryQty = itemDiv.querySelector('.item-summary-qty');
    const summaryDesc = itemDiv.querySelector('.item-summary-desc');
    const summaryAmount = itemDiv.querySelector('.item-summary-amount');
    
    if (summaryQty) summaryQty.textContent = qtyInput.value || '0';
    if (summaryAmount) summaryAmount.textContent = amountInput.value || '0.00';
    
    if (summaryDesc && descEditor.quillInstance) {
        const plainText = descEditor.quillInstance.getText().trim();
        const preview = plainText.substring(0, 60) + (plainText.length > 60 ? '...' : '');
        summaryDesc.textContent = preview || 'New item';
    }
}

function updateTotals() {
    const items = getQuoteItems();
    const taxExempt = document.getElementById('quote-tax-exempt').checked;
    
    let subtotal = 0;
    let hasTbd = false;
    
    items.forEach(item => {
        if (item.is_tbd || item.amount === 'TBD') {
            hasTbd = true;
        } else {
            const amount = parseFloat(item.amount) || 0;
            subtotal += amount;
        }
    });
    
    const taxRate = taxExempt ? 0 : 8.25;
    const taxAmount = subtotal * taxRate / 100;
    const total = subtotal + taxAmount;
    
    document.getElementById('quote-subtotal').textContent = `$${subtotal.toFixed(2)}`;
    document.getElementById('quote-tax').textContent = taxExempt ? '$0.00' : `$${taxAmount.toFixed(2)}`;
    document.getElementById('quote-total').textContent = hasTbd ? `$${total.toFixed(2)}*` : `$${total.toFixed(2)}`;
    
    // Show/hide tax row
    document.getElementById('tax-row').style.display = taxExempt ? 'none' : 'block';
    
    // Show/hide TBD note section
    document.getElementById('tbd-note-section').classList.toggle('hidden', !hasTbd);
}

function getQuoteItems() {
    const items = [];
    const itemDivs = document.querySelectorAll('#quote-items > div');
    
    itemDivs.forEach(div => {
        const content = div.querySelector('.item-content');
        const descEditor = content.querySelector('.item-description-editor');
        const descriptionHTML = descEditor && descEditor.quillInstance 
            ? descEditor.quillInstance.root.innerHTML 
            : '';
        
        const item = {
            quantity: content.querySelector('[data-field="quantity"]').value,
            description: descriptionHTML,
            rate: content.querySelector('[data-field="rate"]').value,
            amount: content.querySelector('[data-field="amount"]').value,
            is_tbd: content.querySelector('[data-field="is_tbd"]').checked
        };
        items.push(item);
    });
    
    return items;
}

async function handleQuoteSubmit(e) {
    e.preventDefault();
    
    const items = getQuoteItems();
    
    if (items.length === 0) {
        alert('Please add at least one item');
        return;
    }
    
    const data = {
        customer_id: parseInt(document.getElementById('quote-customer').value),
        quote_date: document.getElementById('quote-date').value,
        tax_exempt: document.getElementById('quote-tax-exempt').checked,
        items: items,
        tbd_note: document.getElementById('quote-tbd-note').value
    };
    
    try {
        const quoteId = document.getElementById('quote-id').value;
        const url = quoteId ? `/api/quotes/${quoteId}` : '/api/quotes';
        const method = quoteId ? 'PUT' : 'POST';
        
        const response = await fetch(url, {
            method,
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(data)
        });
        
        if (response.ok) {
            closeQuoteModal();
            loadQuotes();
        } else {
            alert('Error saving quote');
        }
    } catch (error) {
        console.error('Error:', error);
        alert('Error saving quote');
    }
}

async function editQuote(id) {
    await openQuoteModal(id);
}

async function deleteQuote(id) {
    if (!confirm('Are you sure you want to delete this quote?')) return;
    
    try {
        const response = await fetch(`/api/quotes/${id}`, { method: 'DELETE' });
        if (response.ok) {
            loadQuotes();
        } else {
            alert('Error deleting quote');
        }
    } catch (error) {
        console.error('Error:', error);
        alert('Error deleting quote');
    }
}

async function viewQuotePDF(id) {
    try {
        const response = await fetch(`/api/quotes/${id}/pdf`, {
            method: 'POST'
        });
        
        if (response.ok) {
            const blob = await response.blob();
            const url = window.URL.createObjectURL(blob);
            const a = document.createElement('a');
            a.href = url;
            
            // Get quote number for filename
            const quote = quotes.find(q => q.id === id);
            a.download = `Quote_${quote.quote_number}.pdf`;
            document.body.appendChild(a);
            a.click();
            window.URL.revokeObjectURL(url);
            document.body.removeChild(a);
        } else {
            alert('Error generating PDF');
        }
    } catch (error) {
        console.error('Error:', error);
        alert('Error generating PDF');
    }
}

// Utility functions
function setDefaultDate() {
    const today = new Date().toISOString().split('T')[0];
    document.getElementById('quote-date').value = today;
}

function formatDate(dateString) {
    const date = new Date(dateString);
    return `${date.getMonth() + 1}/${date.getDate()}/${date.getFullYear()}`;
}