<?php
declare(strict_types=1);
namespace Tekod\ADWMAN\Dashboard;


class AjaxHandlers
{

    /**
     * Handler of "tekod-adwman-add-widget" ajax action.
     */
    public static function handleAddWidget(): void
    {
        self::checkNonce();

        // get params
        $input = [
            'widget' => sanitize_text_field(wp_unslash($_POST['widget'] ?? '')),
            'dashboard' => sanitize_text_field(wp_unslash($_POST['dashboard'] ?? '')),
            'action' => sanitize_text_field(wp_unslash($_POST['action'] ?? '')),
        ];

        // validate
        if (empty($input['widget'])) {
            self::fail('No widget specified.');
        }

        // execute
        $data = $input + [
            'html' => Render::renderSingleWidgetMetabox($input['widget']),
            'scripts' => Render::renderScripts(),
        ];
        // new widget will be auto-stored by "meta-box-order" ajax (secondary request)

        // success
        self::success($data);
    }


    /**
     * Handler of "tekod-adwman-del-widget" ajax action.
     */
    public static function handleDelWidget(): void
    {
        self::checkNonce();

        // get params
        $input = [
            'widget' => sanitize_text_field(wp_unslash($_POST['widget'] ?? '')),
            'dashboard' => sanitize_text_field(wp_unslash($_POST['dashboard'] ?? '')),
            'action' => sanitize_text_field(wp_unslash($_POST['action'] ?? '')),
        ];

        // validate
        if (empty($input['dashboard'])) {
            self::fail('No dashboard specified.', $input);
        }
        if (empty($input['widget'])) {
            self::fail('No widget specified.', $input);
        }

        // execute
        $success = Store::removeWidgetFromDashboard($input['dashboard'], $input['widget']);

        // response
        $data = $input;
        if ($success) {
            self::success($data);
        } else {
            self::fail('Unable to remove widget.', $data);
        }
    }


    /**
     * Handler of "tekod-adwman-add-dash" ajax action.
     */
    public static function handleAddDashboard(): void
    {
        self::checkNonce();

        // get params
        $input = [
            'name' => sanitize_text_field(wp_unslash($_POST['name'] ?? '')),
            'action' => sanitize_text_field(wp_unslash($_POST['action'] ?? '')),
        ];

        // validate
        if (empty($input['name'])) {
            self::fail('Name is required.');
        }

        // execute
        Store::saveDashboard($input['name'], []);
        $data = [
            'action' => $input['action'],
            'name' => $input['name'],
            'widgets' => [],
        ];

        // success
        self::success($data);
    }


    /**
     * Handler of "tekod-adwman-del-dash" ajax action.
     */
    public static function handleDeleteDashboard(): void
    {
        self::checkNonce();

        // get params
        $input = [
            'name' => sanitize_text_field(wp_unslash($_POST['name'] ?? '')),
            'action' => sanitize_text_field(wp_unslash($_POST['action'] ?? '')),
        ];

        // validate
        if (empty($input['name'])) {
            self::fail('Name is required.');
        }

        // execute
        $data = [
            'action' => $input['action'],
            'name' => $input['name'],
            'deleted' => Store::deleteDashboard($input['name']),
        ];

        // success
        self::success($data);
    }


    /**
     * Handler of "tekod-adwman-get-dash" ajax action.
     */
    public static function handleGetDashboard(): void
    {
        self::checkNonce();

        // get params
        $input = [
            'name' => sanitize_text_field(wp_unslash($_POST['name'] ?? '')),
            'action' => sanitize_text_field(wp_unslash($_POST['action'] ?? '')),
        ];

        // validate
        if (empty($input['name'])) {
            self::fail('Name is required.');
        }

        // execute
        Widgets::getAllWidgets();
        $dashStruct = Store::getDashboardByName($input['name']);
        $columns = Render::renderColumns($dashStruct);
        $scripts = Render::renderScripts();
        $data = [
            'action' => $input['action'],
            'name' => $input['name'],
            'columns' => $columns,
            'ids' => array_filter(explode(',', implode(',', $dashStruct))),
            'scripts' => $scripts,
        ];

        // success
        self::success($data);
    }


    /**
     * Handler of "tekod-adwman-rename-dash" ajax action.
     */
    public static function handleRenameDashboard(): void
    {
        self::checkNonce();

        // get params
        $input = [
            'dashboard' => sanitize_text_field(wp_unslash($_POST['dashboard'] ?? '')),
            'name' => sanitize_text_field(wp_unslash($_POST['name'] ?? '')),
            'action' => sanitize_text_field(wp_unslash($_POST['action'] ?? '')),
        ];

        // validate
        if (empty($input['dashboard'])) {
            self::fail('No dashboard specified.', $input);
        }
        if (empty($input['name'])) {
            self::fail('Name is required.');
        }

        // execute
        if (!Store::renameDashboard($input['dashboard'], $input['name'])) {
            self::fail('Specified dashboard not found.', $input);
        }

        // success
        self::success($input);
    }


    /**
     * Handler of "wp_ajax_tekod-adwman-view-mode" ajax action.
     */
    public static function handleViewMode(): void
    {
        self::checkNonce();

        // get params
        $input = [
            'mode' => sanitize_text_field(wp_unslash($_POST['mode'] ?? '')),
            'action' => sanitize_text_field(wp_unslash($_POST['action'] ?? '')),
        ];

        // validate
        if (empty($input['mode'])) {
            self::fail('No mode specified.', $input);
        }

        // execute
        $config = Store::getConfig();
        $config['view'] = $input['mode'];
        Store::saveConfig($config);

        // success
        self::success($input);
    }


    /**
     * Handler of "wp_ajax_tekod-adwman-load-deferred" ajax action.
     */
    public static function handleLoadDeferred(): void
    {
        self::checkNonce();

        // get params
        $input = [
            'widget' => sanitize_text_field(wp_unslash($_POST['widget'] ?? '')),
            'dashboard' => sanitize_text_field(wp_unslash($_POST['dashboard'] ?? '')),
            'action' => sanitize_text_field(wp_unslash($_POST['action'] ?? '')),
        ];

        // validate
        if (empty($input['widget'])) {
            self::fail('No widget specified.', $input);
        }
        if (empty($input['dashboard'])) {
            self::fail('No dashboard specified.', $input);
        }

        // execute
        $data = $input + [
            'html' => Render::renderSingleWidgetContent($input['widget'], $input['dashboard']),
        ];

        // success
        self::success($data);
    }


    /**
     * Handler of "meta-box-order" ajax action.
     */
    public static function handleWpMetaBoxOrder(): void
    {
        // beginning of this handler is copy of native wp_ajax_meta_box_order() function
        // sanitization issue:
        // i had to add sanitization of fetching from superglobal variables because it will not pass plugin approval process,
        // even though the original function in the WordPress core does not include it.

        check_ajax_referer('meta-box-order');
        $order = isset($_POST['order']) ? array_map('sanitize_text_field', (array) wp_unslash($_POST['order'] ?? [])) : false;
        $page_columns = sanitize_text_field(wp_unslash($_POST['page_columns'] ?? 'auto'));

        if ('auto' !== $page_columns) {
            $page_columns = (int) $page_columns;
        }

        $page = sanitize_text_field(wp_unslash($_POST['page'] ?? ''));

        if (sanitize_key($page) !== $page) {
            wp_die(0);
        }

        $user = wp_get_current_user();
        if (!$user) {
            wp_die(-1);
        }

        // custom storing mechanism
        self::handleWpMetaBoxOrderCustomized($order, $page_columns, $user, $page);

        // success
        wp_send_json_success();
    }


    /**
     * Custom storing order of meta boxes.
     *
     * @param mixed $order
     * @param mixed $page_columns
     * @param \WP_User $user
     * @param string $page
     */
    protected static function handleWpMetaBoxOrderCustomized(mixed $order, mixed $page_columns, \WP_User $user, string $page): void
    {
        $selectedDashboard = sanitize_text_field(wp_unslash($_POST['tekod_adwman_dashboard_name'] ?? '')); // nonce is checked in caller function
        Store::saveDashboard($selectedDashboard, $order);

        // send default dashboard to native storage
        if ($selectedDashboard === Store::getListOfDashboards()[0]) {
            if ($order) {
                update_user_meta($user->ID, "meta-box-order_$page", $order);
            }
            if ($page_columns) {
                update_user_meta($user->ID, "screen_layout_$page", $page_columns);
            }
        }

        // deregister native handler
        remove_action('wp_ajax_meta-box-order', 'wp_ajax_meta_box_order', 1);
    }


    /**
     * Terminate execution if nonce is not valid.
     */
    protected static function checkNonce(): void
    {
        $nonce = sanitize_text_field(wp_unslash($_POST['nonce'] ?? ''));
        //$action = sanitize_text_field(wp_unslash($_POST['action'] ?? ''));
        if (wp_verify_nonce($nonce, 'tekod-adwman-nonce') === false) {
            self::fail('Invalid nonce.');
        }
    }


    /**
     * Terminate current request with success.
     *
     * @param array $data
     */
    protected static function success(array $data): void
    {
        // send example data
        $response = [
            'success' => true,
            'data' => $data,
        ];
        wp_send_json($response, 200);
    }


    /**
     * Terminate current request with failure.
     *
     * @param string $message
     * @param array $data
     * @param int $status
     */
    protected static function fail(string $message, array $data = [], int $status = 200): void
    {
        $response = [
            'success' => false,
            'data' => $data,
            'error' => $message,
        ];
        wp_send_json($response, $status);
    }

}