<?php
/**
 * API - Obtener mensajes de un usuario específico
 * Fecha: 4 de enero de 2026
 */

require_once '../config/config.php';

// Verificar autenticación
requireAuthentication();

header('Content-Type: application/json; charset=utf-8');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET');
header('Access-Control-Allow-Headers: Content-Type');

try {
    $userId = intval($_GET['user_id'] ?? 0);
    
    if (!$userId) {
        http_response_code(400);
        echo json_encode(['error' => 'user_id es requerido']);
        exit;
    }
    
    $db = Database::getInstance();
    
    // Obtener mensajes del usuario (de ambas tablas para compatibilidad)
    $conversations = $db->fetchAll(
        "SELECT 
            id,
            user_id,
            COALESCE(content, message_text) as content,
            message_id,
            c.media_url,
            u.phone_number as user_phone,
            direction,
            message_type,
            status,
            created_at,
            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]
    );
    
    // Si no hay mensajes en conversations, intentar con conversations
    if (empty($conversations)) {
        $conversations = $db->fetchAll(
            "SELECT 
                id,
                user_id,
                message_text as content,
                direction,
                message_type,
                status,
                created_at
             FROM conversations 
             WHERE user_id = :user_id
             ORDER BY created_at ASC",
            ['user_id' => $userId]
        );
    }
    
    // Formatear fechas y limpiar datos
    $conversations = array_map(function($msg) {
        return [
            'id' => intval($msg['id']),
            'user_id' => intval($msg['user_id']),
            'content' => $msg['content'] ?? '',
            'message_id' => $msg['message_id'] ?? null,
            'media_url' => (isset($msg['media_url']) && $msg['media_url']) ? (preg_match('#^https?://#i', $msg['media_url']) ? $msg['media_url'] : ("api/get_media.php?id=" . urlencode($msg['media_url']))) : null,
            'filename' => $msg['filename'] ?? null,
            'mime_type' => $msg['mime_type'] ?? null,
            'user_phone' => $msg['user_phone'] ?? null,
            'direction' => $msg['direction'] ?? 'incoming',
            'message_type' => $msg['message_type'] ?? 'text',
            'status' => $msg['status'] ?? 'sent',
            'created_at' => $msg['created_at']
        ];
    }, $conversations);
    
    echo json_encode($conversations);
    
} catch (Exception $e) {
    error_log("Error in get_user_conversations.php: " . $e->getMessage());
    http_response_code(500);
    echo json_encode(['error' => 'Error interno del servidor']);
}
?>