/**
 * Overwrites capabilities in certain scenarios.
 *
 * @since  1.0.0
 * @access public
 * @param  array   $caps
 * @param  string  $cap
 * @param  int     $user_id
 * @param  array   $args
 * @return array
 */
function mb_forum_map_meta_cap($caps, $cap, $user_id, $args)
{
    /* Checks if a user can read a specific forum. */
    if ('read_post' === $cap && mb_is_forum($args[0])) {
        $post = get_post($args[0]);
        if ($user_id != $post->post_author) {
            $parent_id = $post->post_parent;
            /* If we have a parent forum and the user can't read it, don't allow reading this forum. */
            if (0 < $parent_id && !mb_user_can($user_id, 'read_forum', $parent_id)) {
                $caps = array('do_not_allow');
                /* If the user can read the parent forum, check if they can read this one. */
            } else {
                $post_type = get_post_type_object($post->post_type);
                $post_status = mb_get_forum_status($post->ID);
                $status_obj = get_post_status_object($post_status);
                if (mb_get_hidden_post_status() === $status_obj->name) {
                    $caps[] = $post_type->cap->read_hidden_forums;
                } elseif (mb_get_private_post_status() === $status_obj->name) {
                    $caps[] = $post_type->cap->read_private_posts;
                } elseif ($post_type->cap->read !== $post_type->cap->read_others_forums) {
                    $caps[] = $post_type->cap->read_others_forums;
                } else {
                    $caps = array();
                }
            }
        } else {
            $caps = array();
        }
        /* Meta cap for editing a single forum. */
    } elseif ('edit_post' === $cap && mb_is_forum($args[0])) {
        $post = get_post($args[0]);
        $forum_obj = get_post_type_object(mb_get_forum_post_type());
        if ($user_id != $post->post_author) {
            // Open forums.
            if (mb_is_forum_open($args[0])) {
                $caps[] = $forum_obj->cap->edit_open_forums;
            } elseif (mb_is_forum_closed($args[0])) {
                $caps[] = $forum_obj->cap->edit_closed_forums;
            } elseif (mb_is_forum_hidden($args[0])) {
                $caps[] = $forum_obj->cap->edit_hidden_forums;
            }
        }
        /* Meta cap for opening a single forum. */
    } elseif ('open_forum' === $cap) {
        $caps = array();
        $caps[] = user_can($user_id, 'edit_forum', $args[0]) ? 'open_forums' : 'do_not_allow';
        /* Meta cap for closing a single forum. */
    } elseif ('close_forum' === $cap) {
        $caps = array();
        $caps[] = user_can($user_id, 'edit_forum', $args[0]) ? 'close_forums' : 'do_not_allow';
        /* Meta cap for privatizing a single forum. */
    } elseif ('privatize_forum' === $cap) {
        $caps = array();
        $caps[] = user_can($user_id, 'edit_forum', $args[0]) ? 'privatize_forums' : 'do_not_allow';
        /* Meta cap for hiding a single forum. */
    } elseif ('hide_forum' === $cap) {
        $caps = array();
        $caps[] = user_can($user_id, 'edit_forum', $args[0]) ? 'hide_forums' : 'do_not_allow';
        /* Meta cap for spamming a single forum. */
    } elseif ('archive_forum' === $cap) {
        $caps = array();
        $caps[] = user_can($user_id, 'edit_forum', $args[0]) ? 'archive_forums' : 'do_not_allow';
        /* Meta cap for deleting a specific forum. */
    } elseif ('delete_post' === $cap && mb_is_forum($args[0])) {
        $forum_id = mb_get_forum_id($args[0]);
        if (mb_get_default_forum_id() === $forum_id) {
            $caps = array('do_not_allow');
        }
        /* Meta cap check for accessing the forum form. */
    } elseif ('access_forum_form' === $cap) {
        $caps = array('create_forums');
        /* If this is a single forum page, check if user can create sub-forums. */
        if (mb_is_single_forum()) {
            $forum_id = mb_get_forum_id();
            if (!current_user_can('read_forum', $forum_id)) {
                $caps[] = 'do_not_allow';
            } elseif (!mb_forum_allows_subforums($forum_id)) {
                $caps[] = 'do_not_allow';
            }
        } elseif (mb_is_forum_edit() && !user_can($user_id, 'edit_post', mb_get_forum_id())) {
            $caps[] = 'do_not_allow';
        }
    }
    return $caps;
}
/**
 * Overwrites capabilities in certain scenarios.
 *
 * @since  1.0.0
 * @access public
 * @param  array   $caps
 * @param  string  $cap
 * @param  int     $user_id
 * @param  array   $args
 * @return array
 */
function mb_topic_map_meta_cap($caps, $cap, $user_id, $args)
{
    /* Checks if a user can read a specific topic. */
    if ('read_post' === $cap && mb_is_topic($args[0])) {
        $post = get_post($args[0]);
        /* Only run our code if the user isn't the post author. */
        if ($user_id != $post->post_author) {
            $forum_id = $post->post_parent;
            /* If we have a forum and the user can't read it, don't allow reading the topic. */
            if (0 < $forum_id && !mb_user_can($user_id, 'read_forum', $forum_id)) {
                $caps = array('do_not_allow');
                /* If the user can read the forum, check if they can read the topic. */
            } else {
                $post_type = get_post_type_object($post->post_type);
                $post_status = mb_get_topic_status($post->ID);
                $status_obj = get_post_status_object($post_status);
                if (mb_get_hidden_post_status() === $status_obj->name) {
                    $caps[] = $post_type->cap->read_hidden_topics;
                } elseif (mb_get_private_post_status() === $status_obj->name) {
                    $caps[] = $post_type->cap->read_private_posts;
                } elseif ($post_type->cap->read !== $post_type->cap->read_others_topics) {
                    $caps[] = $post_type->cap->read_others_topics;
                } else {
                    $caps = array();
                }
                //$caps[] = $post_type->cap->read;
            }
        } else {
            $caps = array();
        }
        /* Meta cap for editing a single topic. */
    } elseif ('edit_post' === $cap && mb_is_topic($args[0])) {
        $post = get_post($args[0]);
        $topic_obj = get_post_type_object(mb_get_topic_post_type());
        if ($user_id != $post->post_author) {
            // Open topics.
            if (mb_is_topic_open($args[0])) {
                $caps[] = $topic_obj->cap->edit_open_topics;
            } elseif (mb_is_topic_closed($args[0])) {
                $caps[] = $topic_obj->cap->edit_closed_topics;
            } elseif (mb_is_topic_hidden($args[0])) {
                $caps[] = $topic_obj->cap->edit_hidden_topics;
            }
        }
        // Spam topics
        if (mb_is_topic_spam($args[0])) {
            $caps[] = $topic_obj->cap->edit_spam_topics;
        } elseif (mb_is_topic_orphan($args[0])) {
            $caps[] = $topic_obj->cap->edit_orphan_topics;
        }
        /* Meta cap for opening a single topic. */
    } elseif ('open_topic' === $cap) {
        $caps = array();
        $caps[] = user_can($user_id, 'edit_topic', $args[0]) ? 'open_topics' : 'do_not_allow';
        /* Meta cap for closing a single topic. */
    } elseif ('close_topic' === $cap) {
        $caps = array();
        $caps[] = user_can($user_id, 'edit_topic', $args[0]) ? 'close_topics' : 'do_not_allow';
        /* Meta cap for privatizing a single topic. */
    } elseif ('privatize_topic' === $cap) {
        $caps = array();
        $caps[] = user_can($user_id, 'edit_topic', $args[0]) ? 'privatize_topics' : 'do_not_allow';
        /* Meta cap for hiding a single topic. */
    } elseif ('hide_topic' === $cap) {
        $caps = array();
        $caps[] = user_can($user_id, 'edit_topic', $args[0]) ? 'hide_topics' : 'do_not_allow';
        /* Meta cap for spamming a single topic. */
    } elseif ('spam_topic' === $cap) {
        $caps = array();
        $caps[] = user_can($user_id, 'edit_topic', $args[0]) ? 'spam_topics' : 'do_not_allow';
        /* Meta cap for spamming a single topic. */
    } elseif ('super_topic' === $cap) {
        $caps = array();
        $caps[] = user_can($user_id, 'edit_topic', $args[0]) ? 'super_topics' : 'do_not_allow';
        /* Meta cap for spamming a single topic. */
    } elseif ('stick_topic' === $cap) {
        $caps = array();
        $caps[] = user_can($user_id, 'edit_topic', $args[0]) ? 'stick_topics' : 'do_not_allow';
        /* Meta cap check for accessing the topic form. */
    } elseif ('access_topic_form' === $cap) {
        $caps = array('create_topics');
        if (mb_is_single_forum()) {
            $forum_id = mb_get_forum_id();
            if (!current_user_can('read_forum', $forum_id)) {
                $caps[] = 'do_not_allow';
            } elseif (!mb_forum_allows_topics($forum_id)) {
                $caps[] = 'do_not_allow';
            }
        } elseif (mb_is_topic_edit() && !user_can($user_id, 'edit_post', mb_get_topic_id())) {
            $caps[] = 'do_not_allow';
        }
    }
    return $caps;
}