/**
 * Wallet Page Logic - Aadhaar Pro
 */

let currentUserInfo = null;

document.addEventListener('DOMContentLoaded', () => {
    initWalletPage();
});

function initWalletPage() {
    loadBalance();
    setupAmountPresets();
    setupModalFlow();
    setupPaymentForm();
    loadTopupRequests();
}

/**
 * Fetch and update user balance
 */
async function loadBalance() {
    try {
        const res = await fetch('/api/user/info');
        const data = await res.json();
        currentUserInfo = data;

        // Update hero amount
        const heroBalance = document.getElementById('user-balance-hero');
        if (heroBalance) heroBalance.innerText = data.balance.toFixed(2);

        // Update sidebar pill if it exists
        const sidebarPill = document.getElementById('wallet-balance');
        if (sidebarPill) sidebarPill.innerText = data.balance.toFixed(2);

    } catch (err) {
        console.error('Error loading wallet balance:', err);
    }
}

/**
 * Amount Preset Buttons functionality
 */
function setupAmountPresets() {
    const buttons = document.querySelectorAll('.btn-preset');
    const amountInput = document.getElementById('init-amount');

    buttons.forEach(btn => {
        btn.addEventListener('click', () => {
            const amount = btn.getAttribute('data-amount');
            if (amountInput) amountInput.value = amount;
        });
    });
}

/**
 * Setup Modal Open/Close Logic
 */
function setupModalFlow() {
    const proceedBtn = document.getElementById('btn-proceed-topup');
    const modal = document.getElementById('topup-payment-modal');
    const closeBtn = document.getElementById('close-topup-modal');

    if (!proceedBtn || !modal) return;

    proceedBtn.addEventListener('click', () => {
        const initAmount = document.getElementById('init-amount').value;
        const amount = parseFloat(initAmount);

        if (isNaN(amount) || amount < 10) {
            alert('Please enter a valid amount (Minimum ₹10).');
            return;
        }

        // Set amount in the modal
        document.getElementById('pay-amount').value = amount;
        document.getElementById('modal-display-amount').innerText = `₹${amount}`;

        // Update QR Code dynamically
        const upiId = '9219361344@ybl';
        const qrImg = document.getElementById('payment-qr-img');
        qrImg.src = `https://api.qrserver.com/v1/create-qr-code/?size=200x200&data=upi://pay?pa=${upiId}&am=${amount}&tn=WalletTopup`;

        // Show Modal
        modal.style.display = 'flex';
    });

    if (closeBtn) {
        closeBtn.addEventListener('click', () => {
            modal.style.display = 'none';
        });
    }
}

/**
 * Custom Toast Notification
 */
function showToast(type, title, message) {
    const container = document.getElementById('toast-container');
    if (!container) return;

    const toast = document.createElement('div');
    toast.className = `toast-message ${type}`;

    let iconClass = 'fa-solid fa-circle-info';
    if (type === 'success') iconClass = 'fa-solid fa-circle-check';
    if (type === 'error') iconClass = 'fa-solid fa-circle-exclamation';

    toast.innerHTML = `
        <div class="toast-icon"><i class="${iconClass}"></i></div>
        <div class="toast-content">
            <h4>${title}</h4>
            <p>${message}</p>
        </div>
    `;

    container.appendChild(toast);

    // Remove toast after 5 seconds
    setTimeout(() => {
        toast.classList.add('fade-out');
        setTimeout(() => toast.remove(), 400); // Wait for animation
    }, 5000);
}

/**
 * Setup Payment Form Submission
 */
function setupPaymentForm() {
    const form = document.getElementById('payment-form');
    if (!form) return;

    form.addEventListener('submit', async (e) => {
        e.preventDefault();

        const amount = document.getElementById('pay-amount').value;
        const utr = document.getElementById('pay-utr').value;
        const fileInput = document.getElementById('pay-screenshot');
        const file = fileInput ? fileInput.files[0] : null;
        const submitBtn = document.getElementById('btn-submit-topup');

        if (!utr || utr.length < 12) {
            alert('Please enter a valid 12-digit UTR number.');
            return;
        }

        submitBtn.disabled = true;
        submitBtn.innerHTML = '<i class="fa-solid fa-spinner fa-spin"></i> Submitting...';

        // Prepare FormData for multipart upload
        const formData = new FormData();
        formData.append('amount', amount);
        formData.append('utr', utr);
        formData.append('screenshot', file);

        try {
            const res = await fetch('/api/wallet/topup', {
                method: 'POST',
                body: formData
            });
            const data = await res.json();

            if (data.success) {
                // Close modal
                document.getElementById('topup-payment-modal').style.display = 'none';

                // Show rich toast message
                const userName = currentUserInfo ? currentUserInfo.name : 'User';
                const toastMsg = `
                    <strong>Retailer:</strong> ${userName}<br>
                    <strong>Added:</strong> ₹${amount}<br>
                    <strong>UTR:</strong> ${utr}<br>
                    <em>Pending verification.</em>
                `;
                showToast('success', 'Top-up Request Submitted', toastMsg);

                // Reset form and initial input
                form.reset();
                document.getElementById('init-amount').value = '';
                
                // Refresh the top-up requests list
                loadTopupRequests();
            } else {
                showToast('error', 'Submission Failed', data.error);
            }
        } catch (err) {
            console.error('Error submitting top-up:', err);
            showToast('error', 'Network Error', 'Failed to connect to the server.');
        } finally {
            submitBtn.disabled = false;
            submitBtn.innerHTML = '<i class="fa-solid fa-paper-plane" style="margin-right: 8px;"></i> Submit Request';
    }
});
}

/**
 * Load and display user's top-up requests
 */
async function loadTopupRequests() {
    try {
        const res = await fetch('/api/wallet/history');
        const requests = await res.json();
        
        const requestsList = document.getElementById('topup-requests-list');
        const emptyState = document.getElementById('empty-requests');
        
        if (!requestsList) return;
        
        // Clear existing content except empty state
        requestsList.innerHTML = '';
        
        if (requests.length === 0) {
            if (emptyState) {
                requestsList.appendChild(emptyState);
            }
            return;
        }
        
        // Hide empty state if it exists
        if (emptyState) {
            emptyState.style.display = 'none';
        }
        
        // Add requests to the list
        requests.forEach(request => {
            const requestItem = createRequestElement(request);
            requestsList.appendChild(requestItem);
        });
        
    } catch (err) {
        console.error('Error loading top-up requests:', err);
    }
}

/**
 * Create HTML element for a top-up request
 */
function createRequestElement(request) {
    const item = document.createElement('div');
    item.className = 'request-item';
    
    const statusClass = `status-${request.status}`;
    const statusIcon = getStatusIcon(request.status);
    const formattedDate = new Date(request.date).toLocaleString('en-IN', {
        day: '2-digit',
        month: 'short',
        year: 'numeric',
        hour: '2-digit',
        minute: '2-digit'
    });
    
    item.innerHTML = `
        <div class="request-info">
            <div class="request-amount">₹${request.amount.toFixed(2)}</div>
            <div class="request-details">
                <span>UTR: ${request.utr}</span>
                <span>${formattedDate}</span>
            </div>
        </div>
        <div class="request-status ${statusClass}">
            <i class="${statusIcon}"></i>
            ${request.status.charAt(0).toUpperCase() + request.status.slice(1)}
        </div>
    `;
    
    return item;
}

/**
 * Get appropriate icon for request status
 */
function getStatusIcon(status) {
    switch (status) {
        case 'pending': return 'fa-solid fa-clock';
        case 'approved': return 'fa-solid fa-check-circle';
        case 'rejected': return 'fa-solid fa-times-circle';
        default: return 'fa-solid fa-question-circle';
    }
}