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

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

$name = trim($_POST['name'] ?? '');
$phone = trim($_POST['phone'] ?? '');
$twilioId = (int)($_POST['twilio_number_id'] ?? 0);

if ($phone === '' || $twilioId <= 0) {
    echo json_encode(['success' => false, 'error' => '号码与发送账号不能为空。']);
    exit;
}

$pdo = db();
$pdo->beginTransaction();
try {
    $stmt = $pdo->prepare("SELECT id FROM contacts WHERE phone = :phone");
    $stmt->bindValue(':phone', $phone);
    $stmt->execute();
    $contactId = (int)($stmt->fetchColumn() ?: 0);

    if ($contactId === 0) {
        $stmt = $pdo->prepare("INSERT INTO contacts (name, phone) VALUES (:name, :phone)");
        $stmt->bindValue(':name', $name !== '' ? $name : null);
        $stmt->bindValue(':phone', $phone);
        $stmt->execute();
        $contactId = (int)$pdo->lastInsertId();
    }

    $stmt = $pdo->prepare("SELECT id FROM conversations WHERE contact_id = :cid AND twilio_number_id = :tid");
    $stmt->bindValue(':cid', $contactId, PDO::PARAM_INT);
    $stmt->bindValue(':tid', $twilioId, PDO::PARAM_INT);
    $stmt->execute();
    $conversationId = (int)($stmt->fetchColumn() ?: 0);

    if ($conversationId === 0) {
        $stmt = $pdo->prepare("INSERT INTO conversations (contact_id, twilio_number_id) VALUES (:cid, :tid)");
        $stmt->bindValue(':cid', $contactId, PDO::PARAM_INT);
        $stmt->bindValue(':tid', $twilioId, PDO::PARAM_INT);
        $stmt->execute();
        $conversationId = (int)$pdo->lastInsertId();
    }

    $pdo->commit();
    echo json_encode(['success' => true, 'conversation_id' => $conversationId]);
} catch (Throwable $e) {
    $pdo->rollBack();
    echo json_encode(['success' => false, 'error' => '保存失败，请稍后再试。']);
}