mejoras

api/get_user_messages.php

@@ -22,12 +22,16 @@ try {
         echo json_encode(['error' => 'user_id es requerido']);
         exit;
     }
-    
+
+    // Paginación: limit y before (timestamp) - cargamos N mensajes anteriores a 'before'
+    $limit = isset($_GET['limit']) ? intval($_GET['limit']) : 50;
+    $limit = max(1, min(200, $limit));
+    $before = !empty($_GET['before']) ? $_GET['before'] : null; // expect timestamp string
+
     $db = Database::getInstance();
-    
-    // Obtener mensajes del usuario (de ambas tablas para compatibilidad)
-    $conversations = $db->fetchAll(
-        "SELECT 
+
+    // Construir consulta: obtener mensajes ordenados DESC (más recientes primero) y limitar
+    $sql = "SELECT 
             id,
             user_id,
             COALESCE(content, message_text) as content,
@@ -41,25 +45,29 @@ try {
             COALESCE(c.is_read, 0) as is_read
          FROM conversations c 
          LEFT JOIN users u ON c.user_id = u.id
-         WHERE user_id = :user_id
-         UNION ALL
-         SELECT 
-            id,
-            user_id,
-            message_text as content,
-            NULL as message_id,
-            NULL as media_url,
-            NULL as user_phone,
-            direction,
-            message_type,
-            status,
-            created_at,
-            1 as is_read
-         FROM conversations 
-         WHERE user_id = :user_id
-         ORDER BY created_at ASC",
-        ['user_id' => $userId]
-    );
+         WHERE user_id = :user_id";
+
+    $params = ['user_id' => $userId];
+    if ($before) {
+        $sql .= " AND created_at < :before";
+        $params['before'] = $before;
+    }
+
+    $sql .= " ORDER BY created_at DESC LIMIT " . $limit;
+
+    $conversations = $db->fetchAll($sql, $params);
+
+    // Si no hay mensajes, devolver array vacío
+    if (empty($conversations)) {
+        echo json_encode(['success' => true, 'data' => [], 'has_more' => false]);
+        exit;
+    }
+
+    // Queremos devolver los mensajes en orden cronológico ascendente para la UI
+    $conversations = array_reverse($conversations);
+
+    // Indicar si hay más mensajes anteriores (si la consulta original devolvió exactamente $limit, podría haber más)
+    $hasMore = count($conversations) >= 1 && count($conversations) == $limit ? true : false;
     
     // Si no hay mensajes en conversations, intentar con conversations
     if (empty($conversations)) {
@@ -115,8 +123,11 @@ try {
             'created_at' => $msg['created_at']
         ];
     }, $conversations);
-    
-    echo json_encode($conversations);
+
+    // earliest message timestamp (para paginación hacia atrás)
+    $earliest = $conversations[0]['created_at'] ?? null;
+
+    echo json_encode(['success' => true, 'data' => $conversations, 'has_more' => $hasMore, 'earliest' => $earliest]);
     
 } catch (Exception $e) {
     error_log("Error in get_user_conversations.php: " . $e->getMessage());