<?php

namespace Give\Helpers\Form\Template\Utils;

use Give\Session\SessionDonation\DonationAccessor;
use WP_Post;

class Frontend
{
    /**
     * This function will return form id.
     *
     * There are two ways to auto detect form id:
     *   1. If global $post is give_forms post type then we assume that we are on donation form page and return id.
     *   2. if we are not on donation form page and process donation then we will return form id from submitted donation form data.
     *   3. if we are not on donation form page then we will get donation form id from session.
     *
     * This function can be use in donation processing flow i.e from donation form to receipt/failed transaction
     *
     * @since 2.7.0
     * @return int|null
     * @global WP_Post $post
     */
    public static function getFormId()
    {
        global $post;

        if ('give_forms' === get_post_type($post)) {
            return $post->ID;
        }

        if ($formId = Give()->routeForm->getQueriedFormID()) {
            return $formId;
        }

        // Check if admin previewing donation form.
        if ($formId = self::getPreviewDonationFormId()) {
            return $formId;
        }

        // Get form Id on ajax request.
        if (isset($_REQUEST['give_form_id']) && ($formId = absint($_REQUEST['give_form_id']))) {
            return $formId;
        }

        // Get form Id on ajax request.
        if (isset($_REQUEST['form_id']) && ($formId = absint($_REQUEST['form_id']))) {
            return $formId;
        }

        // Get form id on ajax request by donation id.
        if (
            ! empty($_REQUEST['donation_id']) &&
            ($donationId = absint($_REQUEST['donation_id']))
        ) {
            return give_get_payment_form_id($donationId);
        }

        // Get form id from donor purchase session.
        $session = new DonationAccessor();
        $formId = $session->getFormId();

        if ($formId) {
            return $formId;
        }

        return null;
    }

    /**
     * Return form id if admin previewing donation form.
     * Note: only for internal use. This function can be update or remove in future.
     *
     * @since 2.7.0
     * @return int|null
     */
    public static function getPreviewDonationFormId()
    {
        if ( ! current_user_can('edit_give_forms')) {
            return null;
        }

        if (
            isset($_GET['preview'], $_GET['p'], $_GET['post_type']) &&
            filter_var($_GET['preview'], FILTER_VALIDATE_BOOLEAN) &&
            ('give_forms' === give_clean($_GET['post_type'])) &&
            ($formId = absint($_GET['p']))
        ) {
            return $formId;
        }

        return null;
    }
}
