gios-asu/nectary

<?php

namespace Nectary\Models;

use Nectary\Feed;

/**
 * Rss Feed class for pulling and parsing
 * RSS feeds from the web
 *
 * @implements Feed
 */
class Rss_Feed implements Feed {
    private $url;
    private $items;
    private $feed_callback;

    public function __construct( string $url = '', string $feed_callback = null ) {
        $this->url           = $url;
        $this->feed_callback = $feed_callback;
    }

    /**
     * @throws \Exception
     */
    public function retrieve_items() {
        $feed = \call_user_func( $this->feed_callback, $this->url );

        if ( \function_exists( 'is_wp_error' ) && is_wp_error( $feed ) ) {
            throw new \Exception( 'Feed could not be loaded' );
        }

        $this->items = $feed->get_items( 0 );
    }

    // @codingStandardsIgnoreStart
    public function sort_by_date( string $order = 'asc' ) {
        usort( $this->items, function ( $a, $b ) use ( $order ) {
                $a_start_date = strtotime( $a->get_date() );
                $b_start_date = strtotime( $b->get_date() );

                if ( $a_start_date == $b_start_date ) {
                return 0;
                }

                if ( $order === 'asc' ) {
                return ( $a_start_date > $b_start_date ) ? 1 : -1;
                }

                return ( $a_start_date < $b_start_date ) ? 1 : -1;
        } );
    }
    // @codingStandardsIgnoreEnd

    public function get_items() : array {
        return $this->items;
    }

    public function set_items( array $items ) {
        $this->items = $items;
    }

    public function get_unique_items() : array {
        // TODO
    }
}