/** WmailHub 全局常量:邮件大小限制、TTL、Webhook 策略、签名头名称 */

/** # 成员变量: 默认邮件保留时长(秒),1 天 **/
export const DEFAULT_RETENTION_SECONDS = 86_400;

/** # 成员变量: 单封邮件最大字节数(raw MIME),Cloudflare Email Worker 上限为 25MB,取保守值 20MB **/
export const MAX_EMAIL_BYTES = 20 * 1024 * 1024;

/** # 成员变量: 单封邮件最大附件数 **/
export const MAX_ATTACHMENTS = 20;

/** # 成员变量: 单个附件最大字节数 **/
export const MAX_ATTACHMENT_BYTES = 10 * 1024 * 1024;

/** # 成员变量: MIME 头最大字节数 **/
export const MAX_MIME_HEADER_BYTES = 256 * 1024;

/** # 成员变量: Webhook 单次投递超时(毫秒) **/
export const WEBHOOK_TIMEOUT_MS = 10_000;

/** # 成员变量: Webhook 最大尝试次数 **/
export const WEBHOOK_MAX_ATTEMPTS = 5;

/** # 成员变量: Webhook 首次重试退避(毫秒),之后指数递增 **/
export const WEBHOOK_RETRY_BASE_MS = 60_000;

/** # 成员变量: Webhook 签名头 **/
export const WEBHOOK_HEADERS = {
  event: "X-WmailHub-Event",
  delivery: "X-WmailHub-Delivery",
  timestamp: "X-WmailHub-Timestamp",
  signature: "X-WmailHub-Signature",
} as const;

/** # 成员变量: Email Worker 本地测试入口请求头(Worker secret 验证) **/
export const WORKER_TEST_SECRET_HEADER = "X-WmailHub-Test-Secret";

/** # 成员变量: Worker -> Console 信封传递请求头 **/
export const WORKER_ENVELOPE_HEADERS = {
  recipient: "X-WmailHub-Recipient",
  sender: "X-WmailHub-Sender",
} as const;