/**
 * Admin Panel - Support Tickets Logic (Premium Refactor)
 */

let allTickets = [];
let filteredTickets = [];
let activeTicketId = null;

async function updateTicketBadges() {
    try {
        const res = await fetch('/api/admin/tickets');
        const tickets = await res.json();
        const openCount = tickets.filter(t => t.status === 'open').length;
        
        const badge = document.getElementById('open-tkt-badge');
        const navBadge = document.getElementById('open-ticket-count');
        
        if (badge) {
            badge.innerText = `${openCount} Open`;
            badge.style.display = 'inline-block';
        }
        if (navBadge) {
            navBadge.innerText = openCount;
            navBadge.style.display = openCount > 0 ? 'inline-block' : 'none';
        }
    } catch (e) {}
}

async function loadTickets() {
    const container = document.getElementById('ticket-items');
    if (!container) return;
    
    container.innerHTML = `
        <div class="loading-state" style="padding:40px;">
            <i class="fa-solid fa-spinner fa-spin"></i>
            <span>Loading Tickets...</span>
        </div>`;
    
    try {
        const res = await fetch('/api/admin/tickets');
        allTickets = await res.json();
        applyTicketSearch(); // This will render the list
        updateTicketBadges();
    } catch (err) {
        container.innerHTML = '<div class="error-state">Error loading tickets.</div>';
    }
}

function applyTicketSearch() {
    const searchInput = document.getElementById('tkt-search');
    const searchTerm = searchInput ? searchInput.value.toLowerCase().trim() : '';
    
    filteredTickets = allTickets.filter(t => {
        const searchable = `${t.ticket_number} ${t.user_name} ${t.subject} ${t.status}`.toLowerCase();
        return searchable.includes(searchTerm);
    });

    renderTicketList(filteredTickets);
}

function filterTkts(status, btn) {
    // UI Update for Filter Buttons
    document.querySelectorAll('.s-filter-btn').forEach(b => b.classList.remove('active'));
    btn.classList.add('active');
    
    // Filtering Logic
    if (status === 'all') {
        filteredTickets = allTickets;
    } else {
        filteredTickets = allTickets.filter(t => t.status === status);
    }
    
    renderTicketList(filteredTickets);
}

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

    if (tickets.length === 0) {
        container.innerHTML = `
            <div class="empty-state" style="padding:40px; opacity:0.6;">
                <i class="fa-solid fa-inbox fa-2x"></i>
                <p>No tickets found</p>
            </div>`;
        return;
    }
    
    container.innerHTML = tickets.map(t => {
        const isActive = activeTicketId === t.id ? 'active' : '';
        const initial = (t.user_name || 'U').charAt(0).toUpperCase();
        const priorityColor = t.priority === 'high' ? '#ef4444' : (t.priority === 'medium' ? '#f59e0b' : '#3b82f6');
        
        return `
            <div class="tkt-card ${isActive}" onclick="selectTicket('${t.id}')">
                <div class="tkt-meta-top">
                    <span class="tkt-id">#${escapeHtml(t.ticket_number)}</span>
                    <span class="tkt-date">${escapeHtml(t.date.split(',')[0])}</span>
                </div>
                <div class="tkt-user">
                    <div class="tkt-avatar" style="background:${priorityColor}">${initial}</div>
                    <div class="tkt-info">
                        <div class="tkt-username">${escapeHtml(t.user_name)}</div>
                        <div class="tkt-subject">${escapeHtml(t.subject)}</div>
                    </div>
                </div>
                <div class="tkt-badges">
                    <span class="status-pill status-${t.status.toLowerCase()}">${t.status.toUpperCase()}</span>
                    <span class="status-pill" style="background:rgba(0,0,0,0.05); color:var(--text-muted); font-size:0.65rem;">${t.category.toUpperCase()}</span>
                </div>
            </div>
        `;
    }).join('');
}

async function selectTicket(id) {
    activeTicketId = id;
    renderTicketList(filteredTickets); // Update active class
    
    const workspace = document.getElementById('ticket-detail-col');
    if(!workspace) return;

    workspace.innerHTML = `
        <div class="workspace-loading" style="height:100%; display:flex; align-items:center; justify-content:center; color:var(--text-muted);">
            <i class="fa-solid fa-spinner fa-spin fa-2x"></i>
        </div>`;
    
    try {
        const res = await fetch(`/api/admin/tickets/${id}`);
        const t = await res.json();
        
        workspace.innerHTML = `
            <!-- Premium Profile Strip -->
            <div class="chat-profile-strip">
                <div class="chat-user-info">
                    <h3>${escapeHtml(t.subject)}</h3>
                    <div class="chat-user-meta">
                        <span><i class="fa-solid fa-user"></i> ${escapeHtml(t.user_name)}</span>
                        <span><i class="fa-solid fa-phone"></i> ${escapeHtml(t.user_phone)}</span>
                        <span><i class="fa-solid fa-hashtag"></i> ${escapeHtml(t.ticket_number)}</span>
                    </div>
                </div>
                <div class="chat-header-actions">
                    <span class="status-pill status-${t.status.toLowerCase()}">${t.status.toUpperCase()}</span>
                </div>
            </div>
            
            <!-- Modern Chat Window -->
            <div class="chat-window" id="chat-window">
                ${t.messages.map(m => `
                    <div class="message-bubble ${m.sender === 'admin' ? 'admin' : 'user'}">
                        <div class="bubble-content">${escapeHtml(m.message)}</div>
                        <div class="bubble-time">${escapeHtml(m.time)}</div>
                    </div>
                `).join('')}
            </div>
            
            <!-- Premium Reply Footer -->
            <div class="chat-footer">
                <div class="reply-container">
                    <textarea class="reply-textarea" id="admin-reply-text" rows="3" placeholder="Type your reply here..."></textarea>
                    <div class="reply-actions-row">
                        <div class="left-actions">
                            <button class="status-btn resolve" onclick="updateStatus('${t.id}', 'resolved')" title="Mark as Resolved">
                                <i class="fa-solid fa-check-circle"></i> Resolve
                            </button>
                            <button class="status-btn pending" onclick="updateStatus('${t.id}', 'pending')" title="Mark as Pending">
                                <i class="fa-solid fa-clock"></i> Wait
                            </button>
                            <button class="status-btn close" onclick="updateStatus('${t.id}', 'closed')" title="Close Ticket">
                                <i class="fa-solid fa-times-circle"></i> Close
                            </button>
                        </div>
                        <button class="send-reply-btn" onclick="sendReply('${t.id}')">
                            <i class="fa-solid fa-paper-plane"></i> Send Reply
                        </button>
                    </div>
                </div>
            </div>
        `;
        
        // Auto-scroll to bottom
        const chat = document.getElementById('chat-window');
        if(chat) chat.scrollTop = chat.scrollHeight;
        
    } catch (err) {
        workspace.innerHTML = '<div class="workspace-error">Failed to load ticket details.</div>';
    }
}

async function sendReply(id) {
    const textInput = document.getElementById('admin-reply-text');
    if(!textInput) return;
    const text = textInput.value.trim();
    if (!text) return;
    
    const sendBtn = document.querySelector('.send-reply-btn');
    if (sendBtn) {
        sendBtn.innerHTML = '<i class="fa-solid fa-spinner fa-spin"></i> Sending...';
        sendBtn.disabled = true;
    }

    try {
        const res = await fetch(`/api/admin/tickets/${id}/reply`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ message: text })
        });
        
        if (res.ok) {
            selectTicket(id); // Reload chat
        }
    } catch (e) {
        alert('Error sending reply.');
    }
}

async function updateStatus(id, status) {
    try {
        const res = await fetch(`/api/admin/tickets/${id}/status`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ status: status })
        });
        
        if (res.ok) {
            loadTickets(); // Refresh sidebar list
            selectTicket(id); // Refresh workspace view
        }
    } catch (e) {}
}

function escapeHtml(value) {
    return String(value)
        .replaceAll('&', '&amp;')
        .replaceAll('<', '&lt;')
        .replaceAll('>', '&gt;')
        .replaceAll('"', '&quot;')
        .replaceAll("'", '&#39;');
}