<?php
/**
 * GET /api/hub/messages/search.php
 *
 * Search messages across channels or within a specific channel.
 *
 * Query params:
 *   Query      string  REQUIRED  search term
 *   ChannelID  int     optional  limit to a specific channel
 *   Limit      int     optional  default 25, max 100
 *   Offset     int     optional  default 0
 *
 * Response: { OK: true, Messages: [...], Total: int }
 */

require_once __DIR__ . '/../../helpers.php';

if ($_SERVER['REQUEST_METHOD'] !== 'GET') {
    jsonResponse(['OK' => false, 'ERROR' => 'method_not_allowed'], 405);
}

$query = trim($_GET['Query'] ?? '');
$channelId = isset($_GET['ChannelID']) ? (int) $_GET['ChannelID'] : null;
$limit = min(max((int) ($_GET['Limit'] ?? 25), 1), 100);
$offset = max((int) ($_GET['Offset'] ?? 0), 0);

if ($query === '') jsonResponse(['OK' => false, 'ERROR' => 'query_required']);

$searchTerm = '%' . $query . '%';

// Count total
$countSql = "SELECT COUNT(*) as cnt FROM Hub_Messages WHERE Content LIKE ? AND IsDeleted = 0";
$countParams = [$searchTerm];

if ($channelId !== null) {
    $countSql .= " AND ChannelID = ?";
    $countParams[] = $channelId;
}

$total = (int) (queryOne($countSql, $countParams)['cnt'] ?? 0);

// Fetch results
$sql = "SELECT m.*, c.Name AS ChannelName, c.DisplayName AS ChannelDisplayName
        FROM Hub_Messages m
        JOIN Hub_Channels c ON c.ID = m.ChannelID
        WHERE m.Content LIKE ? AND m.IsDeleted = 0";
$params = [$searchTerm];

if ($channelId !== null) {
    $sql .= " AND m.ChannelID = ?";
    $params[] = $channelId;
}

$sql .= " ORDER BY m.CreatedAt DESC LIMIT ? OFFSET ?";
$params[] = $limit;
$params[] = $offset;

$rows = queryTimed($sql, $params);

$messages = [];
foreach ($rows as $row) {
    $messages[] = [
        'ID'                 => (int) $row['ID'],
        'ChannelID'          => (int) $row['ChannelID'],
        'ChannelName'        => $row['ChannelName'],
        'ChannelDisplayName' => $row['ChannelDisplayName'],
        'SenderAddress'      => $row['SenderAddress'],
        'Content'            => $row['Content'],
        'ParentID'           => $row['ParentID'] ? (int) $row['ParentID'] : null,
        'IsEdited'           => (bool) $row['IsEdited'],
        'CreatedAt'          => toISO8601($row['CreatedAt']),
    ];
}

jsonResponse([
    'OK'       => true,
    'Messages' => $messages,
    'Total'    => $total,
]);