/**
 * Admin Panel Logic - Payment Verification + Complaint Tickets
 * Aadhaar Pro
 */

// ── State ──────────────────────────────────────────────────────────
let _allTickets   = [];
let _activeFilter = 'all';
let _activeTicketId = null;

// ── Init ───────────────────────────────────────────────────────────
document.addEventListener('DOMContentLoaded', () => {
    loadTransactions();
    loadTickets();   // preload so badge count shows on page load

    // If URL hash is #support, switch tab automatically
    if (window.location.hash === '#support') switchTab('support');
});

// ══════════════════════════════════════════════════════════════════
//  TAB SWITCHING
// ══════════════════════════════════════════════════════════════════

function switchTab(tab) {
    // Update tab buttons
    document.querySelectorAll('.admin-tab-btn').forEach(b => b.classList.remove('active'));
    document.getElementById(`tab-btn-${tab}`)?.classList.add('active');

    // Show/hide sections
    document.querySelectorAll('.admin-section').forEach(s => s.classList.remove('active'));
    document.getElementById(`section-${tab}`)?.classList.add('active');

    // Update breadcrumb
    const labels = { payments: 'Payment Queue', support: 'Complaints' };
    const bc = document.getElementById('breadcrumb-active');
    if (bc) bc.textContent = labels[tab] || tab;

    // Load data for the activated tab
    if (tab === 'support') loadTickets();
    if (tab === 'payments') loadTransactions();
}

// ══════════════════════════════════════════════════════════════════
//  PAYMENT VERIFICATION (existing logic preserved)
// ══════════════════════════════════════════════════════════════════

async function loadTransactions() {
    const tableBody = document.getElementById('tx-table-body');
    if (!tableBody) return;

    try {
        const res = await fetch('/api/admin/transactions');
        const transactions = await res.json();

        if (transactions.length === 0) {
            tableBody.innerHTML = '<tr><td colspan="7" class="text-center padding-30">No transactions found.</td></tr>';
            return;
        }

        tableBody.innerHTML = transactions.map(t => {
            const statusClass = `status-${t.status.toLowerCase()}`;
            const actions = t.status === 'pending' ? `
                <div class="admin-actions">
                    <button onclick="verifyTransaction('${t.tx_id}', 'approve')" class="btn-verify btn-approve">
                        <i class="fa-solid fa-check"></i> Approve
                    </button>
                    <button onclick="verifyTransaction('${t.tx_id}', 'reject')" class="btn-verify btn-reject">
                        <i class="fa-solid fa-xmark"></i> Reject
                    </button>
                </div>
            ` : `<span class="text-muted-small"><i class="fa-solid fa-circle-check"></i> Complete</span>`;

            return `
                <tr>
                    <td class="text-muted-small">${t.date}</td>
                    <td>
                        <div class="user-cell">
                            <strong>${t.user}</strong>
                            <small>${t.phone}</small>
                        </div>
                    </td>
                    <td class="balance-amount">₹${t.amount}</td>
                    <td><code>${t.utr}</code></td>
                    <td>
                        ${t.screenshot
                            ? `<a href="${t.screenshot}" target="_blank" class="proof-link"><i class="fa-solid fa-image"></i> View Proof</a>`
                            : '<span class="text-muted-small">N/A</span>'}
                    </td>
                    <td><span class="status-pill ${statusClass}">${t.status.toUpperCase()}</span></td>
                    <td>${actions}</td>
                </tr>
            `;
        }).join('');

    } catch (err) {
        console.error('Failed to load transactions:', err);
        tableBody.innerHTML = '<tr><td colspan="7" class="error-state">Failed to fetch transactions.</td></tr>';
    }
}

function showConfirmModal(action) {
    return new Promise((resolve) => {
        const modal      = document.getElementById('custom-confirm-modal');
        const title      = document.getElementById('modal-title');
        const message    = document.getElementById('modal-message');
        const confirmBtn = document.getElementById('modal-confirm-btn');
        const cancelBtn  = document.getElementById('modal-cancel-btn');
        const icon       = document.getElementById('modal-icon');
        const iconCont   = document.getElementById('modal-icon-container');

        if (!modal) { resolve(confirm(`Are you sure you want to ${action} this transaction?`)); return; }

        if (action === 'approve') {
            title.innerText = 'Approve Payment?';
            message.innerHTML = 'This will securely add the <br>requested funds to the user profile.';
            icon.className = 'fa-solid fa-check-circle';
            iconCont.style.color = '#00b894';
            confirmBtn.style.background = '#00b894';
            confirmBtn.style.boxShadow = '0 10px 25px rgba(0,184,148,0.3)';
            confirmBtn.innerText = 'Yes, Approve';
        } else {
            title.innerText = 'Reject Payment?';
            message.innerHTML = 'This request will be permanently<br>declined and user will not get funds.';
            icon.className = 'fa-solid fa-triangle-exclamation';
            iconCont.style.color = '#ff7675';
            confirmBtn.style.background = '#ff7675';
            confirmBtn.style.boxShadow = '0 10px 25px rgba(255,118,117,0.3)';
            confirmBtn.innerText = 'Yes, Reject';
        }

        modal.style.display = 'flex';

        const cleanup = () => { confirmBtn.onclick = null; cancelBtn.onclick = null; modal.style.display = 'none'; };
        confirmBtn.onclick = () => { cleanup(); resolve(true); };
        cancelBtn.onclick  = () => { cleanup(); resolve(false); };
    });
}

async function verifyTransaction(tx_id, action) {
    const confirmed = await showConfirmModal(action);
    if (!confirmed) return;

    try {
        const res = await fetch('/api/admin/verify', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ tx_id, action })
        });
        const data = await res.json();
        if (data.success) loadTransactions();
        else alert(data.error || 'Verification failed');
    } catch (err) {
        console.error('Verification error:', err);
        alert('A network error occurred.');
    }
}

window.verifyTransaction = verifyTransaction;

// ══════════════════════════════════════════════════════════════════
//  COMPLAINT / TICKET MANAGEMENT
// ══════════════════════════════════════════════════════════════════

async function loadTickets() {
    try {
        const res = await fetch('/api/admin/tickets');
        _allTickets = await res.json();
        renderTicketList();
        updateTicketBadge();
    } catch (err) {
        console.error('Failed to load tickets:', err);
        document.getElementById('ticket-items').innerHTML =
            '<p style="padding:16px;color:var(--danger,#e74c3c);">Tickets load nahi hue.</p>';
    }
}

function updateTicketBadge() {
    const openCount = _allTickets.filter(t => t.status === 'open').length;
    const badge     = document.getElementById('tab-badge');
    const navBadge  = document.getElementById('open-ticket-count');
    [badge, navBadge].forEach(el => {
        if (!el) return;
        if (openCount > 0) { el.style.display = 'inline'; el.textContent = openCount; }
        else { el.style.display = 'none'; }
    });
}

function filterTkts(filter, el) {
    _activeFilter = filter;
    _activeTicketId = null;
    document.querySelectorAll('.tf-tab').forEach(t => t.classList.remove('on'));
    el.classList.add('on');
    renderTicketList();
    // Reset detail panel
    document.getElementById('ticket-detail-col').innerHTML =
        '<div class="detail-empty">Koi ticket select karein</div>';
}

function renderTicketList() {
    const container = document.getElementById('ticket-items');
    if (!container) return;

    const list = _activeFilter === 'all'
        ? _allTickets
        : _allTickets.filter(t => t.status === _activeFilter);

    if (list.length === 0) {
        container.innerHTML = '<p style="padding:16px;color:var(--text-muted);font-size:0.85rem;">Koi ticket nahi mila.</p>';
        return;
    }

    container.innerHTML = list.map(t => `
        <div class="tkt-row${t.id === _activeTicketId ? ' active' : ''}" onclick="openTicket('${t.id}')">
            <div class="tkt-row-top">
                <span class="priority-dot p-${t.priority}"></span>
                <span class="tkt-num">${t.ticket_number}</span>
                <span class="tkt-name">${t.user_name}</span>
                <span class="tkt-time">${t.date.split(',')[0]}</span>
            </div>
            <div class="tkt-row-bot">
                <span class="tkt-subject">${t.subject}</span>
                <span class="spill spill-${t.status}">${statusLabel(t.status)}</span>
            </div>
        </div>
    `).join('');
}

async function openTicket(ticketId) {
    _activeTicketId = ticketId;
    renderTicketList();  // highlight active row

    const col = document.getElementById('ticket-detail-col');
    col.innerHTML = '<div class="detail-empty"><i class="fa-solid fa-spinner fa-spin"></i></div>';

    try {
        const res    = await fetch(`/api/admin/tickets/${ticketId}`);
        const ticket = await res.json();
        if (ticket.error) { col.innerHTML = `<div class="detail-empty">${ticket.error}</div>`; return; }

        renderTicketDetail(ticket);
    } catch (err) {
        col.innerHTML = '<div class="detail-empty">Load karne mein error aaya.</div>';
    }
}

function renderTicketDetail(ticket) {
    const col = document.getElementById('ticket-detail-col');
    const isResolved = ticket.status === 'resolved' || ticket.status === 'closed';

    const msgHtml = ticket.messages.map(m => `
        <div class="chat-msg from-${m.sender}">
            <div class="chat-bubble">${escapeHtml(m.message)}</div>
            <div class="chat-meta">${m.sender === 'admin' ? 'Support Team' : ticket.user_name} · ${m.time}</div>
        </div>
    `).join('');

    const replySection = isResolved ? `
        <div class="reply-footer" style="font-size:0.85rem;color:var(--text-muted);text-align:center;padding:14px;">
            <i class="fa-solid fa-circle-check" style="color:#27ae60;"></i> Yeh ticket resolve ho chuka hai.
        </div>
    ` : `
        <div class="reply-footer">
            <textarea class="reply-textarea" id="admin-reply-input" rows="2"
                placeholder="User ko reply likhein..."></textarea>
            <div class="reply-actions">
                <button class="ra-btn primary" onclick="sendAdminReply('${ticket.id}')">
                    <i class="fa-solid fa-paper-plane"></i> Reply
                </button>
                <button class="ra-btn resolve" onclick="updateTicketStatus('${ticket.id}','resolved')">
                    <i class="fa-solid fa-circle-check"></i> Resolved
                </button>
                <button class="ra-btn escalate" onclick="updateTicketStatus('${ticket.id}','open','high')">
                    <i class="fa-solid fa-circle-arrow-up"></i> Escalate
                </button>
                <button class="ra-btn" onclick="sendPromptAboutTicket('${ticket.id}')">
                    Wallet adjust ↗
                </button>
            </div>
        </div>
    `;

    col.innerHTML = `
        <div class="detail-head">
            <div class="detail-head-top">
                <span class="detail-head-num">${ticket.ticket_number}</span>
                <span class="detail-head-name">${ticket.user_name}</span>
                <span class="spill spill-${ticket.status}">${statusLabel(ticket.status)}</span>
            </div>
            <div class="detail-head-meta">
                <span>${ticket.subject}</span>
                <span class="cpill cpill-${ticket.category}">${categoryLabel(ticket.category)}</span>
                <span class="priority-dot p-${ticket.priority}" title="${ticket.priority} priority"></span>
                <span>${ticket.priority} priority</span>
                <span>·</span>
                <span>${ticket.user_phone}</span>
                <span>·</span>
                <span>${ticket.date}</span>
            </div>
        </div>
        <div class="chat-window" id="chat-window-${ticket.id}">${msgHtml}</div>
        ${replySection}
    `;

    // Scroll chat to bottom
    const cw = document.getElementById(`chat-window-${ticket.id}`);
    if (cw) cw.scrollTop = cw.scrollHeight;
}

async function sendAdminReply(ticketId) {
    const input = document.getElementById('admin-reply-input');
    const msg   = input?.value.trim();
    if (!msg) { alert('Reply khali nahi ho sakta.'); return; }

    try {
        const res  = await fetch(`/api/admin/tickets/${ticketId}/reply`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ message: msg })
        });
        const data = await res.json();
        if (data.success) {
            await loadTickets();
            openTicket(ticketId);
        } else {
            alert(data.error || 'Reply send nahi hua.');
        }
    } catch (err) {
        alert('Network error.');
    }
}

async function updateTicketStatus(ticketId, status, priority) {
    const payload = { status };
    if (priority) payload.priority = priority;

    try {
        const res  = await fetch(`/api/admin/tickets/${ticketId}/status`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify(payload)
        });
        const data = await res.json();
        if (data.success) {
            await loadTickets();
            openTicket(ticketId);
        } else {
            alert(data.error || 'Status update nahi hua.');
        }
    } catch (err) {
        alert('Network error.');
    }
}

// ── Helpers ────────────────────────────────────────────────────────

function statusLabel(s) {
    return { open: 'Open', pending: 'Pending', resolved: 'Resolved', closed: 'Closed' }[s] || s;
}
function categoryLabel(c) {
    return { payment: 'Payment', wallet: 'Wallet', refund: 'Refund', other: 'Other' }[c] || c;
}
function escapeHtml(text) {
    return String(text)
        .replace(/&/g, '&amp;').replace(/</g, '&lt;')
        .replace(/>/g, '&gt;').replace(/"/g, '&quot;');
}
function sendPromptAboutTicket(id) {
    const t = _allTickets.find(x => x.id === id);
    if (t) alert(`Wallet adjust ke liye: Admin > Wallet > User search karein (${t.user_name}, ${t.user_phone})`);
}

window.filterTkts     = filterTkts;
window.openTicket     = openTicket;
window.sendAdminReply = sendAdminReply;
window.updateTicketStatus = updateTicketStatus;
window.switchTab      = switchTab;