kompass/modules/Gruppen/Views/GruppenOverview.php

<?php

use Bdp\Modules\Gruppen\Controllers\MainController as GruppenController;

function kompass_print_gruppen_overview()
{
	global $dbHandler;
	?>

	<form method="post" action="admin.php?page=kompass-groups">
		<p style="width: 100%; text-align: right">
			<input type="hidden" name="action" value="searchmember">
			<input type="text" name="member_name" style="width: 500px;"
			       placeholder="<?=__('Search member', BDP_LV_PLUGIN_SLUG); ?>" />
            <input type="submit" class="button" value="<?= __('Search', BDP_LV_PLUGIN_SLUG); ?>" />
		</p>
	</form>


	<table class="wp-list-table widefat fixed striped table-view-list" id="myTable">
		<thead>
		<tr>
			<th scope="col" class="manage-column column-name"><?= __('Group Name', BDP_LV_PLUGIN_SLUG); ?></th>
			<th scope="col" class="manage-column column-name"><?= __('Number Members', BDP_LV_PLUGIN_SLUG); ?></th>
			<th style="width: 100px;" class="manage-column column-name"><?= __('Actions', BDP_LV_PLUGIN_SLUG); ?></th>
		</tr>
		</thead>
		<tbody>
		<?php

		foreach ($dbHandler->readFromDb( GruppenController::KOMPASS_STAMMESGRUPPEN_GRUPPEN) as $currentGruppe) {
            $participantCount = $dbHandler->countSqlRows(GruppenController::KOMPASS_STAMMESGRUPPEN_TEILIS, ['gruppe_id' => $currentGruppe->id]);
			echo '<tr>';
			echo '<td>' . $currentGruppe->gruppen_name  .'</td>';
			echo '<td>' . $participantCount . '</td>';
			echo '<td> ' . kompass_get_group_actions($currentGruppe->id, $participantCount ) .'</td>';
			echo '</tr>';
		}
		?>
		</tbody>
	</table>

	<?php
	echo '<p>';
	if ( current_user_can( 'send_mails' ) ) {
		echo '<a class="button" href="' . admin_url('admin.php?page=kompass-groups') . '&action=compose-mail&group-id=0">' .
		     __( 'Mail to multiple groups', BDP_LV_PLUGIN_SLUG ) . '</a> &nbsp;';
	}

	if (current_user_can('create_teilis')) {
        echo '<a class="button" href="' . admin_url('admin.php?page=kompass-groups') . '&action=new-member">' .
		     __( 'New Member', BDP_LV_PLUGIN_SLUG ) . '</a> &nbsp;';
	}

    if ( current_user_can( 'delete_teilis' ) ) {
    ?>
        <a class="button" href="admin.php?page=kompass-groups&action=create_group_form">
            <?= __('Create Group', BDP_LV_PLUGIN_SLUG); ?></a>
        <?php
    }
	echo '</p>';
}

function kompass_get_group_actions(int $groupId, int $participantCount) : string
{
    $elements = [];
    if ($participantCount > 0) {
        $elements[] = '<a href="' . admin_url('admin.php?page=kompass-groups') . '&action=show-members&group-id=' .$groupId .'">' .
                      __('Show Members', BDP_LV_PLUGIN_SLUG) . '</a>';
        if (current_user_can('send_mails')) {
	        $elements[] = '<a href="' . admin_url('admin.php?page=kompass-groups') . '&action=compose-mail&group-id=' .$groupId .'">' .
	                      __( 'Mail to group', BDP_LV_PLUGIN_SLUG ) . '</a>';
        }
    } else {
	    if (current_user_can('delete_groups')) {
		    $elements[] = '<a href="' . admin_url('admin.php?page=kompass-groups') . '&action=delete-group&group-id=' .$groupId .'">' .
                         __('Delete', BDP_LV_PLUGIN_SLUG) . '</a>';
	    }
    }

    if (current_user_can('edit_groups')) {
	    $elements[] = '<a href="' . admin_url('admin.php?page=kompass-groups') . '&action=edit-group&group-id=' .$groupId .'">' .
                         __('Edit', BDP_LV_PLUGIN_SLUG) . '</a>';
    }

    return implode('<br />' , $elements);

}