<?php
/**
 * Handle "Merge Episodes" setting.
 */

// Checking "merge_episodes" allows to see episodes on the front page.
add_action('pre_get_posts', function ($wp_query) {
    if (\Podlove\get_setting('website', 'merge_episodes') !== 'on') {
        return;
    }

    if (is_home() && $wp_query->is_main_query() && !isset($wp_query->query_vars['post_type'])) {
        $wp_query->set(
            'post_type',
            array_merge(['post', 'podcast'], (array) $wp_query->get('post_type'))
        );
    }
});

// Checking "merge_episodes" also includes episodes in main feed
add_filter('request', function ($query_var) {
    if (!isset($query_var['feed'])) {
        return $query_var;
    }

    if (\Podlove\get_setting('website', 'merge_episodes') !== 'on') {
        return $query_var;
    }

    $extend = [
        'post' => 'post',
        'podcast' => 'podcast',
    ];

    if (empty($query_var['post_type']) || !is_array($query_var['post_type'])) {
        $query_var['post_type'] = $extend;
    } else {
        $query_var['post_type'] = array_merge($query_var['post_type'], $extend);
    }

    return $query_var;
});