)

// ─── LIVE CHAT DB SETUP ───────────────────────────────────────────────────────
add_action('init', 'cgm_live_chat_db_setup');
function cgm_live_chat_db_setup() {
    if (get_option('cgm_live_chat_db_v1')) return;
    global $wpdb;
    $charset = $wpdb->get_charset_collate();

    // Messages table
    $wpdb->query("CREATE TABLE IF NOT EXISTS wp_cgm_live_messages (
        id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
        lead_id BIGINT UNSIGNED NOT NULL,
        sender ENUM('visitor','agent','system') DEFAULT 'visitor',
        message LONGTEXT NOT NULL,
        is_read TINYINT DEFAULT 0,
        created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
        PRIMARY KEY (id),
        KEY lead_id (lead_id)
    ) $charset;");

    // Add chat_mode column to leads table if not exists
    $cols = $wpdb->get_results("SHOW COLUMNS FROM wp_cgm_chat_leads LIKE 'chat_mode'");
    if (empty($cols)) {
        $wpdb->query("ALTER TABLE wp_cgm_chat_leads ADD COLUMN chat_mode VARCHAR(20) DEFAULT 'ai' AFTER status");
    }
    $cols2 = $wpdb->get_results("SHOW COLUMNS FROM wp_cgm_chat_leads LIKE 'last_visitor_msg'");
    if (empty($cols2)) {
        $wpdb->query("ALTER TABLE wp_cgm_chat_leads ADD COLUMN last_visitor_msg DATETIME NULL AFTER chat_mode");
    }

    update_option('cgm_live_chat_db_v1', '1');
}

// ─── LIVE MODE TOGGLE ─────────────────────────────────────────────────────────
add_action('wp_ajax_cgm_live_toggle',        'cgm_live_toggle');
function cgm_live_toggle() {
    $mode = sanitize_text_field($_POST['mode'] ?? 'off');
    update_option('cgm_live_chat_mode', $mode);
    if ($mode === 'on') {
        update_option('cgm_live_chat_last_activity', time());
    }
    wp_send_json_success(['mode' => $mode]);
}

add_action('wp_ajax_cgm_live_get_mode', 'cgm_live_get_mode');
add_action('wp_ajax_nopriv_cgm_live_get_mode', 'cgm_live_get_mode');
function cgm_live_get_mode() {
    $mode = get_option('cgm_live_chat_mode', 'off');
    $last = (int) get_option('cgm_live_chat_last_activity', 0);

    // Auto-off after 10 minutes inactivity
    if ($mode === 'on' && (time() - $last) > 600) {
        update_option('cgm_live_chat_mode', 'off');
        $mode = 'off';
    }
    wp_send_json_success(['mode' => $mode]);
}

add_action('wp_ajax_cgm_live_ping', 'cgm_live_ping');
function cgm_live_ping() {
    update_option('cgm_live_chat_last_activity', time());
    wp_send_json_success();
}

// ─── VISITOR: SEND MESSAGE ────────────────────────────────────────────────────
add_action('wp_ajax_cgm_visitor_send',        'cgm_visitor_send');
add_action('wp_ajax_nopriv_cgm_visitor_send', 'cgm_visitor_send');
function cgm_visitor_send() {
    check_ajax_referer('cgm_chat_nonce', 'nonce');
    global $wpdb;

    $lead_id = intval($_POST['lead_id'] ?? 0);
    $message = sanitize_textarea_field($_POST['message'] ?? '');
    if (!$lead_id || !$message) wp_send_json_error('Invalid.');

    // Store message
    $wpdb->insert('wp_cgm_live_messages', [
        'lead_id'    => $lead_id,
        'sender'     => 'visitor',
        'message'    => $message,
        'is_read'    => 0,
        'created_at' => current_time('mysql'),
    ]);

    // Update last visitor message time
    $wpdb->update('wp_cgm_chat_leads', ['last_visitor_msg' => current_time('mysql')], ['id' => $lead_id]);

    // Check live mode
    $mode = get_option('cgm_live_chat_mode', 'off');
    if ($mode === 'on') {
        // Update lead chat_mode to live
        $wpdb->update('wp_cgm_chat_leads', ['chat_mode' => 'live'], ['id' => $lead_id]);
        wp_send_json_success(['mode' => 'live', 'message_id' => $wpdb->insert_id]);
    } else {
        // AI mode — match answer
        $match = cgm_match_answer($message);
        $reply = $match ? $match->answer : "Thank you for your message! I don't have a specific answer for that right now.\n\nPlease contact us directly:\n📧 **info@crossglobemarketing.com**\n📞 **+91 93520-55466**";
        $quick_replies = $match ? array_filter(array_map('trim', explode(',', $match->quick_replies))) : ['Contact Us', 'Book a Call'];

        // Store AI reply
        $wpdb->insert('wp_cgm_live_messages', [
            'lead_id'    => $lead_id,
            'sender'     => 'agent',
            'message'    => $reply,
            'is_read'    => 1,
            'created_at' => current_time('mysql'),
        ]);

        wp_send_json_success([
            'mode'          => 'ai',
            'reply'         => $reply,
            'quick_replies' => array_values($quick_replies),
        ]);
    }
}

// ─── VISITOR: POLL FOR NEW MESSAGES ──────────────────────────────────────────
add_action('wp_ajax_cgm_visitor_poll',        'cgm_visitor_poll');
add_action('wp_ajax_nopriv_cgm_visitor_poll', 'cgm_visitor_poll');
function cgm_visitor_poll() {
    check_ajax_referer('cgm_chat_nonce', 'nonce');
    global $wpdb;

    $lead_id    = intval($_POST['lead_id'] ?? 0);
    $last_id    = intval($_POST['last_id'] ?? 0);
    if (!$lead_id) wp_send_json_error();

    $messages = $wpdb->get_results($wpdb->prepare(
        "SELECT * FROM wp_cgm_live_messages WHERE lead_id=%d AND id>%d AND sender='agent' ORDER BY id ASC",
        $lead_id, $last_id
    ));

    // Mark as read
    if (!empty($messages)) {
        $wpdb->query($wpdb->prepare(
            "UPDATE wp_cgm_live_messages SET is_read=1 WHERE lead_id=%d AND sender='agent' AND is_read=0",
            $lead_id
        ));
    }

    // Check if agent is typing
    $typing = get_transient('cgm_agent_typing_' . $lead_id);

    wp_send_json_success([
        'messages' => $messages,
        'typing'   => (bool) $typing,
        'mode'     => get_option('cgm_live_chat_mode', 'off'),
    ]);
}

// ─── AGENT: GET ALL ACTIVE CHATS ─────────────────────────────────────────────
add_action('wp_ajax_cgm_agent_get_chats', 'cgm_agent_get_chats');
function cgm_agent_get_chats() {
    global $wpdb;
    $chats = $wpdb->get_results("
        SELECT l.id, l.name, l.email, l.phone, l.chat_mode, l.last_visitor_msg,
        (SELECT COUNT(*) FROM wp_cgm_live_messages m WHERE m.lead_id=l.id AND m.sender='visitor' AND m.is_read=0) as unread,
        (SELECT message FROM wp_cgm_live_messages m WHERE m.lead_id=l.id ORDER BY m.id DESC LIMIT 1) as last_message,
        (SELECT created_at FROM wp_cgm_live_messages m WHERE m.lead_id=l.id ORDER BY m.id DESC LIMIT 1) as last_message_time
        FROM wp_cgm_chat_leads l
        WHERE l.id IN (SELECT DISTINCT lead_id FROM wp_cgm_live_messages)
        ORDER BY last_message_time DESC
        LIMIT 50
    ");
    wp_send_json_success($chats);
}

// ─── AGENT: GET MESSAGES FOR A CHAT ──────────────────────────────────────────
add_action('wp_ajax_cgm_agent_get_messages', 'cgm_agent_get_messages');
function cgm_agent_get_messages() {
    global $wpdb;
    $lead_id = intval($_GET['lead_id'] ?? 0);
    $last_id = intval($_GET['last_id'] ?? 0);
    if (!$lead_id) wp_send_json_error();

    $messages = $wpdb->get_results($wpdb->prepare(
        "SELECT * FROM wp_cgm_live_messages WHERE lead_id=%d AND id>%d ORDER BY id ASC",
        $lead_id, $last_id
    ));

    // Mark visitor messages as read
    $wpdb->query($wpdb->prepare(
        "UPDATE wp_cgm_live_messages SET is_read=1 WHERE lead_id=%d AND sender='visitor' AND is_read=0",
        $lead_id
    ));

    wp_send_json_success($messages);
}

// ─── AGENT: SEND MESSAGE ──────────────────────────────────────────────────────
add_action('wp_ajax_cgm_agent_send', 'cgm_agent_send');
function cgm_agent_send() {
    global $wpdb;
    $lead_id = intval($_POST['lead_id'] ?? 0);
    $message = sanitize_textarea_field($_POST['message'] ?? '');
    if (!$lead_id || !$message) wp_send_json_error();

    $wpdb->insert('wp_cgm_live_messages', [
        'lead_id'    => $lead_id,
        'sender'     => 'agent',
        'message'    => $message,
        'is_read'    => 0,
        'created_at' => current_time('mysql'),
    ]);

    // Update activity
    update_option('cgm_live_chat_last_activity', time());

    // Clear typing indicator
    delete_transient('cgm_agent_typing_' . $lead_id);

    wp_send_json_success(['message_id' => $wpdb->insert_id]);
}

// ─── AGENT: TYPING INDICATOR ──────────────────────────────────────────────────
add_action('wp_ajax_cgm_agent_typing', 'cgm_agent_typing');
function cgm_agent_typing() {
    $lead_id = intval($_POST['lead_id'] ?? 0);
    if ($lead_id) set_transient('cgm_agent_typing_' . $lead_id, 1, 5);
    update_option('cgm_live_chat_last_activity', time());
    wp_send_json_success();
}

// ─── AGENT: TAKE OVER CHAT ────────────────────────────────────────────────────
add_action('wp_ajax_cgm_agent_takeover', 'cgm_agent_takeover');
function cgm_agent_takeover() {
    global $wpdb;
    $lead_id = intval($_POST['lead_id'] ?? 0);
    if (!$lead_id) wp_send_json_error();

    $wpdb->update('wp_cgm_chat_leads', ['chat_mode' => 'live'], ['id' => $lead_id]);

    // Send system message to visitor
    $wpdb->insert('wp_cgm_live_messages', [
        'lead_id'    => $lead_id,
        'sender'     => 'agent',
        'message'    => "You are now connected with a live agent from Cross Globe Marketing. How can I help you?",
        'is_read'    => 0,
        'created_at' => current_time('mysql'),
    ]);

    update_option('cgm_live_chat_last_activity', time());
    wp_send_json_success();
}

// ─── AGENT: HAND BACK TO AI ───────────────────────────────────────────────────
add_action('wp_ajax_cgm_agent_handback', 'cgm_agent_handback');
function cgm_agent_handback() {
    global $wpdb;
    $lead_id = intval($_POST['lead_id'] ?? 0);
    if (!$lead_id) wp_send_json_error();

    $wpdb->update('wp_cgm_chat_leads', ['chat_mode' => 'ai'], ['id' => $lead_id]);

    $wpdb->insert('wp_cgm_live_messages', [
        'lead_id'    => $lead_id,
        'sender'     => 'system',
        'message'    => "You have been transferred back to our AI assistant. Type your question and I will help you!",
        'is_read'    => 0,
        'created_at' => current_time('mysql'),
    ]);

    wp_send_json_success();
}

// Store history messages before lead capture
add_action('wp_ajax_cgm_store_history_msg',        'cgm_store_history_msg');
add_action('wp_ajax_nopriv_cgm_store_history_msg', 'cgm_store_history_msg');
function cgm_store_history_msg() {
    global $wpdb;
    $lead_id = intval($_POST['lead_id'] ?? 0);
    $sender  = sanitize_text_field($_POST['sender'] ?? 'visitor');
    $message = sanitize_textarea_field($_POST['message'] ?? '');
    if (!$lead_id || !$message) wp_send_json_error();
    $wpdb->insert('wp_cgm_live_messages', [
        'lead_id'    => $lead_id,
        'sender'     => in_array($sender, ['visitor','agent','system']) ? $sender : 'visitor',
        'message'    => $message,
        'is_read'    => 1,
        'created_at' => current_time('mysql'),
    ]);
    wp_send_json_success();
}
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