Mailer.php

<?php

namespace WPDesk\Library\WPEmail;

use Exception;
use WP_Error;
use WPDesk\Library\WPEmail\Abstracts\EmailInterface;
use WPDesk\Library\WPEmail\Helpers\HTML;
use WPDesk\View\Renderer\Renderer;
use WPDesk\View\Renderer\SimplePhpRenderer;
use WPDesk\View\Resolver\ChainResolver;
use WPDesk\View\Resolver\DirResolver;

class Mailer {

    /**
     * @var EmailInterface[]
     */
    private $emails = [];

    /**
     * @var Renderer
     */
    private $renderer;

    /**
     * @param array $dirs
     */
    public function __construct(
        array $dirs = []
    ) {
        $this->set_renderer( $this->init_renderer( $dirs ) );
    }

    /**
     * @param array $dirs
     *
     * @return Renderer
     */
    private function init_renderer( array $dirs = [] ): Renderer {
        $resolver = new ChainResolver();
        foreach ( $dirs as $dir ) {
            $resolver->appendResolver( new DirResolver( $dir ) );
        }
        $resolver->appendResolver( new DirResolver( __DIR__ . '/templates' ) );

        return new SimplePhpRenderer( $resolver );
    }

    /**
     * @param Renderer $renderer
     *
     * @return void
     */
    public function set_renderer( Renderer $renderer ) {
        $this->renderer = $renderer;
    }

    /**
     * @param EmailInterface $email
     *
     * @return void
     */
    public function add_email( EmailInterface $email ) {
        $this->emails[ $email->get_id() ] = $email;
    }

    /**
     * @return EmailInterface[]
     */