// Initialize Lucide icons
lucide.createIcons();

// State management
let isSidebarCollapsed = false;
let isBillingExpanded = true;
let lineItemCount = 0;
let currentPatient = null;

// Mock patient data for search
const mockPatients = [
    { id: 'PT-1001', name: 'John Smith', phone: '+1 (555) 123-4567', image: 'https://static.photos/people/100x100/10' },
    { id: 'PT-1002', name: 'Emma Wilson', phone: '+1 (555) 234-5678', image: 'https://static.photos/people/100x100/20' },
    { id: 'PT-1003', name: 'Michael Brown', phone: '+1 (555) 345-6789', image: 'https://static.photos/people/100x100/30' },
    { id: 'PT-1004', name: 'Sarah Johnson', phone: '+1 (555) 456-7890', image: 'https://static.photos/people/100x100/40' },
    { id: 'PT-1005', name: 'David Lee', phone: '+1 (555) 567-8901', image: 'https://static.photos/people/100x100/50' }
];

// Initialize on load
document.addEventListener('DOMContentLoaded', () => {
    // Set default dates
    const today = new Date().toISOString().split('T')[0];
    document.getElementById('invoiceDate').value = today;
    
    const dueDate = new Date();
    dueDate.setDate(dueDate.getDate() + 30);
    document.getElementById('dueDate').value = dueDate.toISOString().split('T')[0];
    
    // Add initial line item
    addLineItem();
});

// Sidebar toggle for mobile
function toggleSidebar() {
    const sidebar = document.getElementById('sidebar');
    const overlay = document.getElementById('mobileOverlay');
    const isOpen = !sidebar.classList.contains('-translate-x-full');
    
    if (isOpen) {
        sidebar.classList.add('-translate-x-full');
        overlay.classList.add('hidden');
        document.body.style.overflow = '';
    } else {
        sidebar.classList.remove('-translate-x-full');
        overlay.classList.remove('hidden');
        document.body.style.overflow = 'hidden';
    }
}

// Sidebar toggle for desktop
function toggleSidebarDesktop() {
    const sidebar = document.getElementById('sidebar');
    const mainWrapper = document.getElementById('mainWrapper');
    const desktopToggle = document.getElementById('desktopToggle');
    
    isSidebarCollapsed = !isSidebarCollapsed;
    
    if (isSidebarCollapsed) {
        sidebar.classList.add('sidebar-collapsed');
        sidebar.style.width = '5rem';
        mainWrapper.style.marginLeft = '5rem';
        desktopToggle.innerHTML = '<i data-lucide="panel-right" class="w-5 h-5"></i>';
    } else {
        sidebar.classList.remove('sidebar-collapsed');
        sidebar.style.width = '16rem';
        mainWrapper.style.marginLeft = '16rem';
        desktopToggle.innerHTML = '<i data-lucide="panel-left" class="w-5 h-5"></i>';
    }
    
    lucide.createIcons();
    
    // Handle billing submenu visibility
    const submenu = document.getElementById('billingSubmenu');
    if (isSidebarCollapsed) {
        submenu.style.display = 'none';
    } else if (isBillingExpanded) {
        submenu.style.display = 'block';
    }
}

// Billing submenu toggle
function toggleBillingSubmenu() {
    if (isSidebarCollapsed) return;
    
    const submenu = document.getElementById('billingSubmenu');
    const chevron = document.getElementById('billingChevron');
    
    isBillingExpanded = !isBillingExpanded;
    
    if (isBillingExpanded) {
        submenu.style.display = 'block';
        chevron.style.transform = 'rotate(0deg)';
    } else {
        submenu.style.display = 'none';
        chevron.style.transform = 'rotate(-90deg)';
    }
}

// Patient type toggle
function setPatientType(type) {
    const btnExisting = document.getElementById('btnExisting');
    const btnNew = document.getElementById('btnNew');
    const existingForm = document.getElementById('existingPatientForm');
    const newForm = document.getElementById('newPatientForm');
    
    if (type === 'existing') {
        btnExisting.classList.add('bg-white', 'text-gray-900', 'shadow-sm');
        btnExisting.classList.remove('text-gray-600');
        btnNew.classList.remove('bg-white', 'text-gray-900', 'shadow-sm');
        btnNew.classList.add('text-gray-600');
        
        existingForm.classList.remove('hidden');
        newForm.classList.add('hidden');
    } else {
        btnNew.classList.add('bg-white', 'text-gray-900', 'shadow-sm');
        btnNew.classList.remove('text-gray-600');
        btnExisting.classList.remove('bg-white', 'text-gray-900', 'shadow-sm');
        btnExisting.classList.add('text-gray-600');
        
        newForm.classList.remove('hidden');
        existingForm.classList.add('hidden');
    }
}

// Patient search functionality
function searchPatients(query) {
    const resultsDiv = document.getElementById('searchResults');
    
    if (query.length < 2) {
        resultsDiv.classList.add('hidden');
        return;
    }
    
    const filtered = mockPatients.filter(p => 
        p.name.toLowerCase().includes(query.toLowerCase()) ||
        p.id.toLowerCase().includes(query.toLowerCase()) ||
        p.phone.includes(query)
    );
    
    if (filtered.length === 0) {
        resultsDiv.innerHTML = '<div class="p-3 text-sm text-gray-500">No patients found</div>';
    } else {
        resultsDiv.innerHTML = filtered.map(patient => `
            <div onclick="selectPatient('${patient.id}')" class="p-3 hover:bg-gray-50 cursor-pointer border-b border-gray-100 last:border-0 transition-colors">
                <div class="flex items-center gap-3">
                    <img src="${patient.image}" class="w-8 h-8 rounded-full object-cover">
                    <div>
                        <p class="font-medium text-gray-900 text-sm">${patient.name}</p>
                        <p class="text-xs text-gray-500">${patient.id} • ${patient.phone}</p>
                    </div>
                </div>
            </div>
        `).join('');
    }
    
    resultsDiv.classList.remove('hidden');
}

// Select patient from search
function selectPatient(patientId) {
    const patient = mockPatients.find(p => p.id === patientId);
    if (!patient) return;
    
    currentPatient = patient;
    
    document.getElementById('searchResults').classList.add('hidden');
    document.getElementById('patientSearch').value = '';
    
    // Show selected patient card
    document.getElementById('spImage').src = patient.image;
    document.getElementById('spName').textContent = patient.name;
    document.getElementById('spId').textContent = patient.id;
    document.getElementById('spPhone').textContent = patient.phone;
    document.getElementById('selectedPatientCard').classList.remove('hidden');
}

// Clear selected patient
function clearPatient() {
    currentPatient = null;
    document.getElementById('selectedPatientCard').classList.add('hidden');
}

// Add line item to invoice
function addLineItem() {
    const tbody = document.getElementById('lineItemsBody');
    const row = document.createElement('tr');
    row.className = 'line-item border-b border-gray-100 hover:bg-gray-50 transition-colors';
    row.id = `lineItem-${lineItemCount}`;
    
    row.innerHTML = `
        <td class="py-3 pl-2">
            <select class="w-full px-3 py-2 border border-gray-200 rounded-md text-sm focus-verify-teal outline-none bg-white" onchange="updateCalculation('${lineItemCount}')">
                <option value="">Select Service</option>
                <option value="consultation">Consultation</option>
                <option value="lab_test">Laboratory Test</option>
                <option value="xray">X-Ray</option>
                <option value="surgery">Surgery</option>
                <option value="medication">Medication</option>
                <option value="therapy">Physical Therapy</option>
                <option value="vaccination">Vaccination</option>
            </select>
        </td>
        <td class="py-3">
            <input type="text" class="w-full px-3 py-2 border border-gray-200 rounded-md text-sm focus-verify-teal outline-none" placeholder="Description">
        </td>
        <td class="py-3">
            <input type="number" id="qty-${lineItemCount}" value="1" min="1" class="w-full px-3 py-2 border border-gray-200 rounded-md text-sm focus-verify-teal outline-none text-center" onchange="updateCalculation('${lineItemCount}')">
        </td>
        <td class="py-3">
            <input type="number" id="rate-${lineItemCount}" value="0.00" min="0" step="0.01" class="w-full px-3 py-2 border border-gray-200 rounded-md text-sm focus-verify-teal outline-none" onchange="updateCalculation('${lineItemCount}')">
        </td>
        <td class="py-3">
            <input type="text" id="amount-${lineItemCount}" value="$0.00" readonly class="w-full px-3 py-2 bg-gray-50 border border-gray-200 rounded-md text-sm text-gray-700 font-medium cursor-not-allowed font-variant-numeric">
        </td>
        <td class="py-3 text-right">
            <button onclick="removeLineItem('${lineItemCount}')" class="text-gray-400 hover:text-red-500 transition-colors p-1 rounded hover:bg-red-50/50">
                <i data-lucide="trash-2" class="w-4 h-4"></i>
            </button>
        </td>
    `;
    
    tbody.appendChild(row);
    lineItemCount++;
    
    // Refresh icons
    lucide.createIcons();
}

// Remove line item
function removeLineItem(id) {
    const row = document.getElementById(`lineItem-${id}`);
    if (row) {
        row.style.opacity = '0';
        row.style.transform = 'translateX(-20px)';
        setTimeout(() => {
            row.remove();
            calculateTotals();
        }, 200);
    }
}

// Update line item calculation
function updateCalculation(id) {
    const qty = parseFloat(document.getElementById(`qty-${id}`).value) || 0;
    const rate = parseFloat(document.getElementById(`rate-${id}`).value) || 0;
    const amount = qty * rate;
    
    document.getElementById(`amount-${id}`).value = '$' + amount.toFixed(2);
    calculateTotals();
}

// Calculate invoice totals
function calculateTotals() {
    let subtotal = 0;
    
    // Sum all line items
    for (let i = 0; i < lineItemCount; i++) {
        const amountField = document.getElementById(`amount-${i}`);
        if (amountField && amountField.parentElement.parentElement.style.display !== 'none') {
            const value = parseFloat(amountField.value.replace('$', '')) || 0;
            subtotal += value;
        }
    }
    
    const tax = subtotal * 0.08; // 8% tax
    const total = subtotal + tax;
    
    // Update summary displays
    document.getElementById('summarySubtotal').textContent = '$' + subtotal.toFixed(2);
    document.getElementById('summaryTax').textContent = '$' + tax.toFixed(2);
    document.getElementById('summaryTotal').textContent = '$' + total.toFixed(2);
    document.getElementById('mobileTotal').textContent = '$' + total.toFixed(2);
}

// Save invoice
function saveInvoice() {
    showToast('Invoice saved successfully!');
    // In real app, would send to backend
}

// Print invoice
function printInvoice() {
    window.print();
}

// Send invoice
function sendInvoice() {
    showToast('Invoice sent to patient email!');
    // In real app, would trigger email/SMS
}

// Toast notification
function showToast(message) {
    const toast = document.getElementById('toast');
    const toastMessage = document.getElementById('toastMessage');
    
    toastMessage.textContent = message;
    toast.classList.remove('translate-y-20', 'opacity-0');
    
    setTimeout(() => {
        toast.classList.add('translate-y-20', 'opacity-0');
    }, 3000);
}

// Close search results when clicking outside
document.addEventListener('click', (e) => {
    const searchContainer = document.getElementById('patientSearch');
    const resultsDiv = document.getElementById('searchResults');
    
    if (!searchContainer.contains(e.target) && !resultsDiv.contains(e.target)) {
        resultsDiv.classList.add('hidden');
    }
});

// Handle window resize
window.addEventListener('resize', () => {
    if (window.innerWidth >= 1024) {
        document.getElementById('mobileOverlay').classList.add('hidden');
        document.body.style.overflow = '';
    } else {
        const sidebar = document.getElementById('sidebar');
        sidebar.classList.add('-translate-x-full');
    }
});