package mailyak

import (
	"mime"
)

// To sets a list of recipient addresses.
//
// You can pass one or more addresses to this method, all of which are viewable to the recipients.
//
//	mail.To("dom@itsallbroken.com", "another@itsallbroken.com")
//
// or pass a slice of strings:
//
//	tos := []string{
//		"one@itsallbroken.com",
//		"John Doe <two@itsallbroken.com>"
//	}
//
//	mail.To(tos...)
func (m *MailYak) To(addrs ...string) {
	m.toAddrs = []string{}

	for _, addr := range addrs {
		trimmed := m.trimRegex.ReplaceAllString(addr, "")
		if trimmed == "" {
			continue
		}

		m.toAddrs = append(m.toAddrs, trimmed)
	}
}

// Bcc sets a list of blind carbon copy (BCC) addresses.
//
// You can pass one or more addresses to this method, none of which are viewable to the recipients.
//
//	mail.Bcc("dom@itsallbroken.com", "another@itsallbroken.com")
//
// or pass a slice of strings:
//
//	bccs := []string{
//		"one@itsallbroken.com",
//		"John Doe <two@itsallbroken.com>"
//	}
//
//	mail.Bcc(bccs...)
func (m *MailYak) Bcc(addrs ...string) {
	m.bccAddrs = []string{}

	for _, addr := range addrs {
		trimmed := m.trimRegex.ReplaceAllString(addr, "")
		if trimmed == "" {
			continue
		}

		m.bccAddrs = append(m.bccAddrs, trimmed)
	}
}

// WriteBccHeader writes the BCC header to the MIME body when true. Defaults to
// false.
//
// This is usually required when writing the MIME body to an email API such as
// Amazon's SES, but can cause problems when sending emails via a SMTP server.
//
// Specifically, RFC822 says:
//
//	Some  systems  may choose to include the text of the "Bcc" field only in the
//	author(s)'s  copy,  while  others  may also include it in the text sent to
//	all those indicated in the "Bcc" list.
//
// This ambiguity can result in some SMTP servers not stripping the BCC header
// and exposing the BCC addressees to recipients. For more information, see:
//
//	https://github.com/domodwyer/mailyak/issues/14
func (m *MailYak) WriteBccHeader(shouldWrite bool) {
	m.writeBccHeader = shouldWrite
}

// Cc sets a list of carbon copy (CC) addresses.
//
// You can pass one or more addresses to this method, which are viewable to the other recipients.
//
//	mail.Cc("dom@itsallbroken.com", "another@itsallbroken.com")
//
// or pass a slice of strings:
//
//	ccs := []string{
//		"one@itsallbroken.com",
//		"John Doe <two@itsallbroken.com>"
//	}
//
//	mail.Cc(ccs...)
func (m *MailYak) Cc(addrs ...string) {
	m.ccAddrs = []string{}

	for _, addr := range addrs {
		trimmed := m.trimRegex.ReplaceAllString(addr, "")
		if trimmed == "" {
			continue
		}

		m.ccAddrs = append(m.ccAddrs, trimmed)
	}
}

// From sets the sender email address.
//
// Users should also consider setting FromName().
func (m *MailYak) From(addr string) {
	m.fromAddr = m.trimRegex.ReplaceAllString(addr, "")
}

// FromName sets the sender name.
//
// If set, emails typically display as being from:
//
//	From Name <sender@example.com>
//
// If name contains non-ASCII characters, it is Q-encoded according to RFC1342.
func (m *MailYak) FromName(name string) {
	m.fromName = mime.QEncoding.Encode("UTF-8", m.trimRegex.ReplaceAllString(name, ""))
}

// ReplyTo sets the Reply-To email address.
//
// Setting a ReplyTo address is optional.
func (m *MailYak) ReplyTo(addr string) {
	m.replyTo = m.trimRegex.ReplaceAllString(addr, "")
}

// Subject sets the email subject line.
//
// If sub contains non-ASCII characters, it is Q-encoded according to RFC1342.
func (m *MailYak) Subject(sub string) {
	m.subject = mime.QEncoding.Encode("UTF-8", m.trimRegex.ReplaceAllString(sub, ""))
}

// AddHeader adds an arbitrary email header.
// It appends to any existing values associated with key.
//
// If value contains non-ASCII characters, it is Q-encoded according to RFC1342.
// As always, validate any user input before adding it to a message, as this
// method may enable an attacker to override the standard headers and, for
// example, BCC themselves in a password reset email to a different user.
func (m *MailYak) AddHeader(name, value string) {
	key := m.trimRegex.ReplaceAllString(name, "")
	m.headers[key] = append(m.headers[key], mime.QEncoding.Encode("UTF-8", m.trimRegex.ReplaceAllString(value, "")))
}

// SetHeader sets the header entries associated with key to
// the single element value. It replaces any existing
// values associated with key.
//
// If value contains non-ASCII characters, it is Q-encoded according to RFC1342.
// As always, validate any user input before adding it to a message, as this
// method may enable an attacker to override the standard headers and, for
// example, BCC themselves in a password reset email to a different user.
func (m *MailYak) SetHeader(name, value string) {
	m.headers[m.trimRegex.ReplaceAllString(name, "")] = []string{mime.QEncoding.Encode("UTF-8", m.trimRegex.ReplaceAllString(value, ""))}
}

// LocalName sets the sender domain name.
//
// If set, it is used in the EHLO/HELO command instead of the default domain
// (localhost, see [smtp.NewClient]). Some SMTP servers, such as the Gmail
// SMTP-relay, requires a proper domain name and will reject attempts to use
// localhost.
func (m *MailYak) LocalName(name string) {
	m.localName = m.trimRegex.ReplaceAllString(name, "")
}