pub suberror SmtpClientError {
  TransportClosed
  BusyTransport
  Timeout(SmtpPhase, Int)
  ConnectionFailure(SmtpPhase, String)
  InvalidResponse(String)
  UnexpectedStatus(Int, Int, String)
  ServiceRejected(SmtpPhase, Int, String, FailureClass)
  MissingExtension(String)
  MissingAuthMechanism(SmtpAuthMechanism)
  AuthFailed(String)
  ProtocolError(String)
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub struct DeliveryOutcome {
  accepted : Array[
@moonbit-community/email/core.Mailbox
Mailbox]
  rejected : Array[
@moonbit-community/email/core.Mailbox
Mailbox]
  unsent : Array[
@moonbit-community/email/core.Mailbox
Mailbox]
  response : String
  failure_class : FailureClass?
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub struct DeliveryRecord {
  envelope : 
@moonbit-community/email/core.Envelope
Envelope
  encoded_message : String
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) enum FailureClass {
  Transient
  Permanent
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub struct FakeTransport {
  records : Array[DeliveryRecord]
  closed : Bool
} derive(
@moonbitlang/core/debug.Debug
Debug)

pub struct FileArtifact {
  path : String
  content : String
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub struct FileTransport {
  root_dir : String
  artifacts : Array[FileArtifact]
  next_index : Int
  closed : Bool
} derive(
@moonbitlang/core/debug.Debug
Debug)

pub struct SmtpAttempt {
  envelope : 
@moonbit-community/email/core.Envelope
Envelope
  encoded_message : String
  connection_id : Int
  trace : Array[String]
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) enum SmtpAuth {
  None
  Plain(String, String)
  Login(String, String)
  Xoauth2(String, String)
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) enum SmtpAuthMechanism {
  Plain
  Login
  Xoauth2
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub struct SmtpCapabilities {
  raw_lines : Array[String]
  auth_mechanisms : Array[SmtpAuthMechanism]
  supports_starttls : Bool
  supports_pipelining : Bool
  supports_8bitmime : Bool
  max_message_size : Int?
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub struct SmtpConfig {
  host : String
  port : Int
  hello_name : String
  security : SmtpSecurity
  auth : SmtpAuth
  tls_trust : SmtpTlsTrust
  timeouts : SmtpTimeouts
  retry_policy : SmtpRetryPolicy
  reuse_connection : Bool
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) enum SmtpPhase {
  Connect
  Greet
  Hello
  StartTls
  TlsHandshake
  Auth
  MailFrom
  RcptTo
  DataCommand
  MessageBody
  FinalResponse
  Quit
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub struct SmtpRetryPolicy {
  max_retries : Int
  retry_delay_ms : Int
  retry_on_connection_failure : Bool
  retry_on_timeout : Bool
  retry_on_transient_failure : Bool
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) enum SmtpSecurity {
  Plain
  StartTls
  Tls
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub struct SmtpTimeouts {
  connect_ms : Int
  greeting_ms : Int
  command_ms : Int
  data_ms : Int
  idle_ms : Int
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub(all) enum SmtpTlsTrust {
  SystemRoot
  InsecureNoVerify
  CustomPemFile(String)
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)

pub struct SmtpTransport {
  // private fields
}

pub struct StubSmtpTransport {
  pool_size : Int
  planned_outcomes : Array[DeliveryOutcome]
  next_plan_index : Int
  attempts : Array[SmtpAttempt]
  send_count : Int
  closed : Bool
} derive(
@moonbitlang/core/debug.Debug
Debug)

pub(all) enum TransportError {
  ClosedTransport
  IoFailure(String)
} derive(Eq, 
@moonbitlang/core/debug.Debug
Debug)