<?php

declare(strict_types=1);

namespace org\wplake\advanced_views;

defined('ABSPATH') || exit;

// unlike get_current_screen it fits for early calls
class CurrentScreen
{
    /**
     * This constant includes: the settings, tools and other plugin pages
     * (as they're ViewsCpt child pages)
     */
    const CPT_ANY = 'any';
    const CPT_EDIT = 'edit';
    const CPT_LIST = 'list';

    /**
     * To avoid running the same checks multiple times
     * (it's better, as number of potentials target screens is small and won't eat much memory)
     * @var array<string,bool>
     */
    protected array $cache;

    public function __construct()
    {
        $this->cache = [];
    }

    protected function isRestCptRelated(string $cptName): bool
    {
        $requestUrl = $_SERVER['REQUEST_URI'] ?? '';

        return false !== strpos($requestUrl, '/wp-json/') &&
            false !== strpos($requestUrl, '/' . $cptName . '/');
    }

    // includes any rest requests
    public function isAdmin(): bool
    {
        if (false === key_exists('isAdmin', $this->cache)) {
            $requestUri = $_SERVER['REQUEST_URI'] ?? '';
            $this->cache['isAdmin'] = true === is_admin() ||
                false !== strpos($requestUri, '/wp-json/');
        }

        return $this->cache['isAdmin'];
    }

    // no arguments, as during ajax it's impossible to detect the specific plugin
    public function isAjax(): bool
    {
        if (false === key_exists('isAjax', $this->cache)) {
            // do not use 'is_ajax()' function, it may be not available yet
            $this->cache['isAjax'] = true === defined('DOING_AJAX') &&
                true === DOING_AJAX;
        }

        return $this->cache['isAjax'];
    }

    // includes cptRelated rest requests
    public function isAdminCptRelated(
        string $cptName,
        string $screen = self::CPT_ANY
    ): bool {
        if (false === $this->isAdmin()) {
            return false;
        }

        $cacheKey = $cptName . '-' . $screen;

        if (true === key_exists($cacheKey, $this->cache)) {
            return $this->cache[$cacheKey];
        }

        //  manual detection for early calls
        $requestUrl = $_SERVER['REQUEST_URI'] ?? '';
        $postType = sanitize_text_field($_GET['post_type'] ?? '');
        $action = sanitize_text_field($_GET['action'] ?? '');
        $isAdminCptRelated = false;

        switch ($screen) {
            case self::CPT_LIST:
                $isAdminCptRelated = false !== strpos($requestUrl, '/edit.php') &&
                    $cptName === $postType &&
                    false === strpos($requestUrl, 'page=');
                break;
            case self::CPT_ANY:
            case self::CPT_EDIT:
                // CPT_ANY requires the simple check for most of the pages
                // (but if we're on the edit page, CPT_ANY requires the tricky check)
                if (self::CPT_ANY === $screen &&
                    $cptName === $postType) {
                    $isAdminCptRelated = true;
                    break;
                }

                $isMyPostPage = false !== strpos($requestUrl, '/post-new.php') &&
                    $cptName === $postType;
                $isEditPage = false !== strpos($requestUrl, '/post.php') &&
                    'edit' == $action;
                $isMyEditPage = false;

                if (true === $isEditPage) {
                    $postId = (int)($_GET['post'] ?? 0);
                    $isMyEditPage = $cptName === (string)get_post_type($postId);
                }

                $isAdminCptRelated = true === $isMyEditPage ||
                    true === $isMyPostPage;
                break;
        }

        $this->cache[$cacheKey] = true === $isAdminCptRelated ||
            true === $this->isRestCptRelated($cptName);

        return $this->cache[$cacheKey];
    }

}