<?php declare(strict_types=1);

namespace Lean\Response;

use function get_class, gettype, is_object, is_string, sprintf;

use Psr\Http\Message\StreamInterface;

use Zend\Diactoros\Exception,
    Zend\Diactoros\Response,
    Zend\Diactoros\Stream,
    Zend\Diactoros\Response\InjectContentTypeTrait;

/**
 * PDF Response
 *
 * Allows creating a response by passing a string to the constructor;
 * by default, sets a status code of 200 and sets the Content-Type header to
 * application/pdf.
 */
class PdfResponse extends Response
{
    use InjectContentTypeTrait;

    /**
     * Create a PDF response
     *
     * Produces a pdf response with a Content-Type of application/json and a default
     * status of 200.
     *
     * @param string|StreamInterface $content String or stream for the message body.
     * @param int $status Integer status code for the response; 200 by default.
     * @param array $headers Array of headers to use at initialization.
     * @throws Exception\InvalidArgumentException if $content is neither a string or stream.
     */
    public function __construct($content, int $status = 200, array $headers = [])
    {
        parent::__construct(
            $this->createBody($content),
            $status,
            $this->injectContentType('application/pdf; charset=utf-8', $headers)
        );
    }

    /**
     * Create the message body.
     *
     * @param string|StreamInterface $content
     * @throws Exception\InvalidArgumentException if $content is neither a string or stream.
     */
    private function createBody($content) : StreamInterface
    {
        if ($content instanceof StreamInterface) {
            return $content;
        }

        if (! is_string($content)) {
            throw new Exception\InvalidArgumentException(sprintf(
                'Invalid content (%s) provided to %s',
                (is_object($content) ? get_class($content) : gettype($content)),
                __CLASS__
            ));
        }

        $body = new Stream('php://temp', 'wb+');
        $body->write($content);
        $body->rewind();
        return $body;
    }
}