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<?php

namespace Laminas\Mail\Storage\Part;

use ArrayIterator;
use Laminas\Mail\Header\HeaderInterface;
use Laminas\Mail\Headers;
use RecursiveIterator;

interface PartInterface extends RecursiveIterator
{
    /**
     * Check if part is a multipart message
     *
     * @return bool if part is multipart
     */
    public function isMultipart();

    /**
     * Body of part
     *
     * If part is multipart the raw content of this part with all sub parts is
     * returned.
     *
     * @return string body
     * @throws Exception\ExceptionInterface
     */
    public function getContent();

    /**
     * Return size of part
     *
     * @return int size
     */
    public function getSize();

    /**
     * Get part of multipart message
     *
     * @param  int $num number of part starting with 1 for first part
     * @return PartInterface wanted part
     * @throws Exception\ExceptionInterface
     */
    public function getPart($num);

    /**
     * Count parts of a multipart part
     *
     * @return int number of sub-parts
     */
    public function countParts();

    /**
     * Get all headers
     *
     * The returned headers are as saved internally. All names are lowercased.
     * The value is a string or an array if a header with the same name occurs
     * more than once.
     *
     * @return Headers
     */
    public function getHeaders();

    /**
     * Get a header in specified format
     *
     * Internally headers that occur more than once are saved as array, all
     * other as string. If $format is set to string implode is used to concat
     * the values (with Laminas\Mime\Mime::LINEEND as delim).
     *
     * @param string $name name of header, matches case-insensitive, but
     *     camel-case is replaced with dashes
     * @param string $format change type of return value to 'string' or 'array'
     * @return string|array|HeaderInterface|ArrayIterator value of header in
     *     wanted or internal format
     * @throws Exception\ExceptionInterface
     */
    public function getHeader($name, $format = null);

    /**
     * Get a specific field from a header like content type or all fields as array
     *
     * If the header occurs more than once, only the value from the first
     * header is returned.
     *
     * Throws an exception if the requested header does not exist. If the
     * specific header field does not exist, returns null.
     *
     * @param string $name name of header, like in getHeader()
     * @param string $wantedPart the wanted part, default is first, if null an
     *     array with all parts is returned
     * @param string $firstName key name for the first part
     * @return string|array wanted part or all parts as
     *     [$firstName => firstPart, partname => value]
     * @throws Exception\ExceptionInterface
     */
    public function getHeaderField($name, $wantedPart = '0', $firstName = '0');

    /**
     * Getter for mail headers - name is matched in lowercase
     *
     * This getter is short for PartInterface::getHeader($name, 'string')
     *
     * @see PartInterface::getHeader()
     *
     * @param  string $name header name
     * @return string value of header
     * @throws Exception\ExceptionInterface
     */
    public function __get($name);

    /**
     * magic method to get content of part
     *
     * @return string content
     */
    public function __toString();
}