<?php

namespace Podlove\Settings\Podcast;

use Podlove\Settings\Settings;

/**
 * Represents one Expert Settings Tab.
 */
class Tab
{
    protected $page_hook = 'podlove_podcast_settings_page';

    /**
     * Tab title.
     *
     * @var string
     */
    private $title;

    /**
     * Tab slug used in URLs.
     *
     * @var string
     */
    private $slug;

    /**
     * If this is true, use it if no tab is selected.
     *
     * @var bool
     */
    private $is_default;

    public function __construct($slug, $title, $is_default = false)
    {
        $this->slug = strtolower(\Podlove\slugify($slug));
        $this->set_title($title);
        $this->is_default = $is_default;
    }

    public function is_active()
    {
        $is_current_tab = isset($_REQUEST['podlove_tab']) && $this->get_slug() == $_REQUEST['podlove_tab'];

        return $is_current_tab || !isset($_REQUEST['podlove_tab']) && $this->is_default;
    }

    public function get_title()
    {
        return $this->title;
    }

    public function set_title($title)
    {
        $this->title = $title;
    }

    public function get_slug()
    {
        return $this->slug;
    }

    public function get_url()
    {
        return sprintf('?page=%s&podlove_tab=%s', filter_var($_REQUEST['page'], FILTER_SANITIZE_URL), $this->get_slug());
    }

    public function page()
    {
        do_action($this->page_hook);
    }

    public function init()
    {
        throw Exception('You need to subclass Tab and implement Tab::init');
    }
}