<?php

namespace RestrictUserAccess\Module;

use RestrictUserAccess\Hook\HookService;
use RestrictUserAccess\Hook\HookSubscriberInterface;
use RestrictUserAccess\Repository\SettingRepositoryInterface;

/**
 * Class ContentMode
 *
 * @author Joachim Jensen <joachim@dev.institute>
 * @license https://www.gnu.org/licenses/gpl-3.0.html
 */
class ContentMode implements HookSubscriberInterface
{
    private $handled_content_ids = [];

    /** @var SettingRepositoryInterface */
    private $settingRepository;

    public function __construct(
        SettingRepositoryInterface  $settingRepository
    ) {
        $this->settingRepository = $settingRepository;
    }

    public function subscribe(HookService $service)
    {
        if (is_admin()) {
            return;
        }

        $service->add_action(
            'wp_head',
            [$this, 'init']
        );
        $service->add_filter(
            'rest_api_init',
            [$this, 'init_rest']
        );
    }

    public function init()
    {
        if (!$this->is_enabled()) {
            return;
        }
        if (is_singular()) {
            return;
        }
        $this->add_content_filters();
    }

    /**
     * @param \WP_Rest_Server $wp_rest_server
     * @return void
     */
    public function init_rest(\WP_Rest_Server $wp_rest_server)
    {
        if (!$this->is_enabled()) {
            return;
        }
        if (current_user_can('edit_posts')) {
            return;
        }
        $this->add_content_filters();
    }

    /**
     * @param string $content
     * @return string
     */
    public function restrict_the_content($content)
    {
        $id = get_the_ID();
        if (isset($this->handled_content_ids[$id])) {
            return $content;
        }

        $this->handled_content_ids[$id] = true;

        //bail if password is required, wp will show input form
        if (post_password_required()) {
            return $content;
        }
        //bail if is $more_link_text is used, already showing teaser
        if (preg_match('/href=".+#more-[0-9]*"/', $content)) {
            return $content;
        }
        return get_the_excerpt();
    }

    private function is_enabled()
    {
        return $this->settingRepository->get_int('rua_list_content_mode') !== 0;
    }

    private function add_content_filters()
    {
        $option_value = $this->settingRepository->get_int('rua_list_content_mode');
        switch ($option_value) {
            case 1:
                add_filter('the_content', [$this, 'restrict_the_content']);
                return;
            case 2:
                add_filter('the_content', '__return_empty_string');
                add_filter('the_excerpt', '__return_empty_string');
                return;
            default:
                return;
        }
    }
}