<?php
declare(strict_types=1);
require_once __DIR__ . '/../includes/bootstrap.php';
require_once __DIR__ . '/../includes/twilio.php';

header('Content-Type: application/json');

$payload = json_decode((string)file_get_contents('php://input'), true);
$conversationId = (int)($payload['conversation_id'] ?? 0);
$body = trim($payload['body'] ?? '');

if ($conversationId <= 0 || $body === '') {
    echo json_encode(['success' => false, 'error' => '会话与内容不能为空。']);
    exit;
}

$pdo = db();
$stmt = $pdo->prepare("
    SELECT c.id, ct.phone, t.account_sid, t.auth_token, t.from_number, t.label, t.is_active
    FROM conversations c
    JOIN contacts ct ON ct.id = c.contact_id
    JOIN twilio_numbers t ON t.id = c.twilio_number_id
    WHERE c.id = :cid
");
$stmt->bindValue(':cid', $conversationId, PDO::PARAM_INT);
$stmt->execute();
$twilio = $stmt->fetch();

if (!$twilio) {
    echo json_encode(['success' => false, 'error' => '找不到会话。']);
    exit;
}

$status = 'stored';
if ((int)$twilio['is_active'] === 1 && $twilio['account_sid'] && $twilio['auth_token']) {
    $sendResult = twilio_send_sms($twilio, $twilio['phone'], $body);
    if (!empty($sendResult['success'])) {
        $status = 'sent';
    } else {
        $status = 'failed';
    }
}

$stmt = $pdo->prepare("INSERT INTO messages (conversation_id, direction, body, status) VALUES (:cid, 'outbound', :body, :status)");
$stmt->bindValue(':cid', $conversationId, PDO::PARAM_INT);
$stmt->bindValue(':body', $body);
$stmt->bindValue(':status', $status);
$stmt->execute();

$stmt = $pdo->prepare("UPDATE conversations SET last_message_at = NOW() WHERE id = :cid");
$stmt->bindValue(':cid', $conversationId, PDO::PARAM_INT);
$stmt->execute();

echo json_encode(['success' => true, 'status' => $status]);