package mail

import "errors"

// Sentinel errors emitted by Service methods. Handlers translate them
// into HTTP responses; tests match on them with errors.Is.
var (
	// ErrDeliveryNotFound is returned by AdminGetDelivery and AdminResend
	// when the supplied delivery_id does not name a row.
	ErrDeliveryNotFound = errors.New("mail: delivery not found")

	// ErrResendOnSent is returned by AdminResend when the targeted row
	// is in the terminal `sent` state. The admin contract maps this to
	// 409 Conflict; resending an already-delivered mail would push a
	// duplicate copy to the recipient.
	ErrResendOnSent = errors.New("mail: cannot resend a sent delivery")

	// ErrUnknownTemplate is returned by EnqueueTemplate when the
	// supplied template_id is not registered in the inline template
	// catalog. A typo at the producer is the typical cause.
	ErrUnknownTemplate = errors.New("mail: unknown template")

	// ErrInvalidRecipient is returned by EnqueueLoginCode and
	// EnqueueTemplate when the supplied recipient address is empty or
	// fails go-mail's RFC 5322 validation.
	ErrInvalidRecipient = errors.New("mail: invalid recipient address")
)