<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\mail;

/**
 * MessageInterface is the interface that should be implemented by mail message classes.
 *
 * A message represents the settings and content of an email, such as the sender, recipient,
 * subject, body, etc.
 *
 * Messages are sent by a [[\yii\mail\MailerInterface|mailer]], like the following,
 *
 * ~~~
 * Yii::$app->mail->compose()
 *     ->setFrom('from@domain.com')
 *     ->setTo($form->email)
 *     ->setSubject($form->subject)
 *     ->setTextBody('Plain text content')
 *     ->setHtmlBody('<b>HTML content</b>')
 *     ->send();
 * ~~~
 *
 * @see MailerInterface
 *
 * @author Paul Klimov <klimov.paul@gmail.com>
 * @since 2.0
 */
interface MessageInterface
{
	/**
	 * Returns the character set of this message.
	 * @return string the character set of this message.
	 */
	public function getCharset();

	/**
	 * Sets the character set of this message.
	 * @param string $charset character set name.
	 * @return static self reference.
	 */
	public function setCharset($charset);

	/**
	 * Returns the message sender.
	 * @return string the sender
	 */
	public function getFrom();

	/**
	 * Sets the message sender.
	 * @param string|array $from sender email address.
	 * You may pass an array of addresses if this message is from multiple people.
	 * You may also specify sender name in addition to email address using format:
	 * `[email => name]`.
	 * @return static self reference.
	 */
	public function setFrom($from);

	/**
	 * Returns the message recipient(s).
	 * @return array the message recipients
	 */
	public function getTo();

	/**
	 * Sets the message recipient(s).
	 * @param string|array $to receiver email address.
	 * You may pass an array of addresses if multiple recipients should receive this message.
	 * You may also specify receiver name in addition to email address using format:
	 * `[email => name]`.
	 * @return static self reference.
	 */
	public function setTo($to);

	/**
	 * Returns the reply-to address of this message.
	 * @return string the reply-to address of this message.
	 */
	public function getReplyTo();

	/**
	 * Sets the reply-to address of this message.
	 * @param string|array $replyTo the reply-to address.
	 * You may pass an array of addresses if this message should be replied to multiple people.
	 * You may also specify reply-to name in addition to email address using format:
	 * `[email => name]`.
	 * @return static self reference.
	 */
	public function setReplyTo($replyTo);

	/**
	 * Returns the Cc (additional copy receiver) addresses of this message.
	 * @return array the Cc (additional copy receiver) addresses of this message.
	 */
	public function getCc();

	/**
	 * Sets the Cc (additional copy receiver) addresses of this message.
	 * @param string|array $cc copy receiver email address.
	 * You may pass an array of addresses if multiple recipients should receive this message.
	 * You may also specify receiver name in addition to email address using format:
	 * `[email => name]`.
	 * @return static self reference.
	 */
	public function setCc($cc);

	/**
	 * Returns the Bcc (hidden copy receiver) addresses of this message.
	 * @return array the Bcc (hidden copy receiver) addresses of this message.
	 */
	public function getBcc();

	/**
	 * Sets the Bcc (hidden copy receiver) addresses of this message.
	 * @param string|array $bcc hidden copy receiver email address.
	 * You may pass an array of addresses if multiple recipients should receive this message.
	 * You may also specify receiver name in addition to email address using format:
	 * `[email => name]`.
	 * @return static self reference.
	 */
	public function setBcc($bcc);

	/**
	 * Returns the message subject.
	 * @return string the message subject
	 */
	public function getSubject();

	/**
	 * Sets the message subject.
	 * @param string $subject message subject
	 * @return static self reference.
	 */
	public function setSubject($subject);

	/**
	 * Sets message plain text content.
	 * @param string $text message plain text content.
	 * @return static self reference.
	 */
	public function setTextBody($text);

	/**
	 * Sets message HTML content.
	 * @param string $html message HTML content.
	 * @return static self reference.
	 */
	public function setHtmlBody($html);

	/**
	 * Attaches existing file to the email message.
	 * @param string $fileName full file name
	 * @param array $options options for embed file. Valid options are:
	 *
	 * - fileName: name, which should be used to attach file.
	 * - contentType: attached file MIME type.
	 *
	 * @return static self reference.
	 */
	public function attach($fileName, array $options = []);

	/**
	 * Attach specified content as file for the email message.
	 * @param string $content attachment file content.
	 * @param array $options options for embed file. Valid options are:
	 *
	 * - fileName: name, which should be used to attach file.
	 * - contentType: attached file MIME type.
	 *
	 * @return static self reference.
	 */
	public function attachContent($content, array $options = []);

	/**
	 * Attach a file and return it's CID source.
	 * This method should be used when embedding images or other data in a message.
	 * @param string $fileName file name.
	 * @param array $options options for embed file. Valid options are:
	 *
	 * - fileName: name, which should be used to attach file.
	 * - contentType: attached file MIME type.
	 *
	 * @return string attachment CID.
	 */
	public function embed($fileName, array $options = []);

	/**
	 * Attach a content as file and return it's CID source.
	 * This method should be used when embedding images or other data in a message.
	 * @param string $content  attachment file content.
	 * @param array $options options for embed file. Valid options are:
	 *
	 * - fileName: name, which should be used to attach file.
	 * - contentType: attached file MIME type.
	 *
	 * @return string attachment CID.
	 */
	public function embedContent($content, array $options = []);

	/**
	 * Sends this email message.
	 * @param MailerInterface $mailer the mailer that should be used to send this message.
	 * If null, the "mail" application component will be used instead.
	 * @return boolean whether this message is sent successfully.
	 */
	public function send(MailerInterface $mailer = null);

	/**
	 * Returns string representation of this message.
	 * @return string the string representation of this message.
	 */
	public function toString();
}
