<?php


declare(strict_types=1);

namespace org\wplake\advanced_views\Dashboard;

use Exception;
use org\wplake\advanced_views\Cards\DataStorage\CardsDataStorage;
use org\wplake\advanced_views\Common\HooksInterface;
use org\wplake\advanced_views\CurrentScreen;
use org\wplake\advanced_views\Groups\SettingsData;
use org\wplake\advanced_views\Settings;
use org\wplake\advanced_views\Views\Cpt\ViewsCpt;
use org\wplake\advanced_views\Views\DataStorage\ViewsDataStorage;

defined('ABSPATH') || exit;

class SettingsPage implements HooksInterface
{
    const SLUG = 'acf-views-settings';
    /**
     * @var array<string,mixed>
     */
    protected array $values;
    protected SettingsData $settingsData;
    protected Settings $settings;
    protected ViewsDataStorage $viewsDataStorage;
    protected CardsDataStorage $cardsDataStorage;
    protected string $savedMessage;

    public function __construct(
        SettingsData $settingsData,
        Settings $settings,
        ViewsDataStorage $viewsDataStorage,
        CardsDataStorage $cardsDataStorage
    ) {
        $this->values = [];
        $this->settingsData = $settingsData;
        $this->settings = $settings;
        $this->viewsDataStorage = $viewsDataStorage;
        $this->cardsDataStorage = $cardsDataStorage;
        $this->savedMessage = '';
    }

    /**
     * @param mixed $postId
     */
    protected function isMySource($postId): bool
    {
        $screen = get_current_screen();

        return null !== $screen &&
            'acf_views_page_acf-views-settings' === $screen->id &&
            'options' === $postId;
    }

    protected function activateFsStorage(): void
    {
        if (false === mkdir($this->viewsDataStorage->getFileSystem()->getTargetBaseFolder(), 0755)) {
            $this->savedMessage = __(
                'Fail to activate the file system storage. Check your FS permissions.',
                'acf-views'
            );
            return;
        }

        // set, as the folder was just created
        $this->viewsDataStorage->getFileSystem()->setBaseFolder();
        $this->cardsDataStorage->getFileSystem()->setBaseFolder();

        $this->viewsDataStorage->activateFileSystemStorage();
        $this->cardsDataStorage->activateFileSystemStorage();
    }

    protected function deactivateFsStorage(): void
    {
        $themeTemplatesFolder = $this->viewsDataStorage->getFileSystem()->getBaseFolder();

        $this->viewsDataStorage->deactivateFileSystemStorage();
        $this->cardsDataStorage->deactivateFileSystemStorage();

        $isRemoved = $this->viewsDataStorage->getFileSystem()->removeFolderRecursively($themeTemplatesFolder);

        if (true === $isRemoved) {
            return;
        }

        $this->savedMessage = __(
            'Fail to deactivate the file system storage. Check your FS permissions.',
            'acf-views'
        );
    }

    public function addPage(): void
    {
        // do not use 'acf_add_options_page', as the global options-related functions may be unavailable
        // (in case of the manual include)
        if (!function_exists('acf_options_page')) {
            return;
        }

        $resultMessage = sanitize_text_field($_GET['resultMessage'] ?? '');

        $updatedMessage = '' === $resultMessage ?
            __('Settings successfully updated.', 'acf-views') :
            $resultMessage;

        acf_options_page()->add_page([
            'slug' => self::SLUG,
            'page_title' => __('Settings', 'acf-views'),
            'menu_title' => __('Settings', 'acf-views'),
            'parent_slug' => sprintf('edit.php?post_type=%s', ViewsCpt::NAME),
            'position' => 2,
            'update_button' => __('Save changes', 'acf-views'),
            'updated_message' => $updatedMessage,
        ]);
    }

    /**
     * @param mixed $postId
     */
    public function maybeCatchValues($postId): void
    {
        if (!$this->isMySource($postId)) {
            return;
        }

        add_filter('acf/pre_update_value', function ($isUpdated, $value, $postId, array $field): bool {
            // extra check, as probably it's about another post
            if (!$this->isMySource($postId)) {
                return $isUpdated;
            }

            $fieldName = (string)($field['name'] ?? '');

            $this->values[$fieldName] = $value;

            // avoid saving to the postmeta
            return true;
        }, 10, 4);
    }

    public function maybeInjectValues(): void
    {
        if (!$this->isMySource('options')) {
            return;
        }

        add_filter('acf/pre_load_value', function ($value, $postId, $field) {
            // extra check, as probably it's about another post
            if (!$this->isMySource($postId)) {
                return $value;
            }

            $fieldName = $field['name'];
            $value = '';

            switch ($fieldName) {
                case SettingsData::getAcfFieldName(SettingsData::FIELD_IS_DEV_MODE):
                    $value = $this->settings->isDevMode();
                    break;
                case SettingsData::getAcfFieldName(SettingsData::FIELD_IS_FILE_SYSTEM_STORAGE):
                    $value = '' !== $this->viewsDataStorage->getFileSystem()->getBaseFolder();
                    break;
            }

            return $value;
        }, 10, 3);
    }

    /**
     * @param mixed $postId
     * @throws Exception
     */
    public function maybeProcess($postId): void
    {
        if (!$this->isMySource($postId) ||
            [] === $this->values) {
            return;
        }

        $this->settingsData->load(false, '', $this->values);

        $this->settings->setIsDevMode($this->settingsData->isDevMode);

        if (true === $this->settingsData->isFileSystemStorage &&
            false === $this->viewsDataStorage->getFileSystem()->isActive()) {
            $this->activateFsStorage();
        }

        if (false === $this->settingsData->isFileSystemStorage &&
            true === $this->viewsDataStorage->getFileSystem()->isActive()) {
            $this->deactivateFsStorage();
        }

        $this->settings->save();

        if ('' === $this->savedMessage) {
            return;
        }

        wp_redirect(add_query_arg([
            'message' => 1,
            'resultMessage' => $this->savedMessage,
        ]));
        exit;
    }

    public function setHooks(CurrentScreen $currentScreen): void
    {
        if (false === $currentScreen->isAdmin()) {
            return;
        }

        // init, not acf/init, as the method uses 'get_edit_post_link' which will be available only since this hook
        // (because we sign up the CPTs in this hook)
        add_action('init', [$this, 'addPage',]);
        add_action('acf/save_post', [$this, 'maybeCatchValues',]);
        // priority 20, as it's after the ACF's save_post hook
        add_action('acf/save_post', [$this, 'maybeProcess',], 20);
        add_action('acf/input/admin_head', [$this, 'maybeInjectValues']);
    }
}