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Filename : uninstall.php
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<?php

/**
 * Uninstall Give
 *
 * @package     Give
 * @since       1.0
 * @copyright   Copyright (c) 2016, GiveWP
 * @license     https://opensource.org/licenses/gpl-license GNU Public License
 * @subpackage  Uninstall
 */

// Exit if accessed directly.
if (!defined('WP_UNINSTALL_PLUGIN')) {
    exit;
}

// Load Give file.
include_once('give.php');

/**
 * Initialize the main Give class, which includes loading the code necessary to process the uninstall.
 * This is included manually because the plugins_loaded hook does not run on uninstall.
 *
 * @since 2.7.4
 */
give()->init();

// Prevent checking for plugin updates
remove_filter('pre_set_site_transient_update_plugins', 'give_check_addon_updates', 999);

global $wpdb, $wp_roles;


if (give_is_setting_enabled(give_get_option('uninstall_on_delete'))) {

    // Delete All the Custom Post Types.
    $give_taxonomies = ['form_category', 'form_tag'];
    $give_post_types = ['give_forms', 'give_payment'];
    foreach ($give_post_types as $post_type) {

        foreach (get_object_taxonomies($post_type) as $taxonomy) {
            $give_taxonomies[] = $taxonomy;
        }

        $items = get_posts(
            [
                'post_type'   => $post_type,
                'post_status' => 'any',
                'numberposts' => -1,
                'fields'      => 'ids',
            ]
        );

        if ($items) {
            foreach ($items as $item) {
                wp_delete_post($item, true);
            }
        }
    }

    // Delete All the Terms & Taxonomies.
    foreach (array_unique(array_filter($give_taxonomies)) as $taxonomy) {

        $terms = $wpdb->get_results(
            $wpdb->prepare(
                "
				SELECT t.*, tt.*
				FROM $wpdb->terms AS t
				INNER JOIN $wpdb->term_taxonomy AS tt
					ON t.term_id = tt.term_id
				WHERE tt.taxonomy IN ('%s')
				ORDER BY t.name ASC
				",
                $taxonomy
            )
        );

        // Delete Terms.
        if ($terms) {
            foreach ($terms as $term) {
                $wpdb->delete($wpdb->term_taxonomy, ['term_taxonomy_id' => $term->term_taxonomy_id]);
                $wpdb->delete($wpdb->terms, ['term_id' => $term->term_id]);
            }
        }

        // Delete Taxonomies.
        $wpdb->delete($wpdb->term_taxonomy, ['taxonomy' => $taxonomy], ['%s']);
    }

    // Delete the Plugin Pages.
    $give_created_pages = ['success_page', 'failure_page', 'history_page'];
    foreach ($give_created_pages as $p) {
        $page = give_get_option($p, false);
        if ($page) {
            wp_delete_post($page, true);
        }
    }

    // Delete Capabilities.
    give()->roles->remove_caps();

    // Delete the Roles.
    $give_roles = ['give_manager', 'give_accountant', 'give_worker', 'give_donor'];
    foreach ($give_roles as $role) {
        remove_role($role);
    }

    // Remove all give database tables.
    $give_tables = $wpdb->get_col("SHOW TABLES LIKE '{$wpdb->prefix}give_%'");
    $wpdb->query('DROP TABLE ' . implode(',', $give_tables));

    // Cleanup Cron Events.
    wp_clear_scheduled_hook('give_daily_scheduled_events');
    wp_clear_scheduled_hook('give_weekly_scheduled_events');
    wp_clear_scheduled_hook('give_daily_cron');
    wp_clear_scheduled_hook('give_weekly_cron');

    // Get all options.
    $give_option_names = $wpdb->get_col(
        $wpdb->prepare(
            "
			SELECT option_name
			FROM {$wpdb->options}
			WHERE option_name LIKE '%s'
			",
            '%give%'
        )
    );

    if (!empty($give_option_names)) {
        // Convert option name to transient or option name.
        $new_give_option_names = [];

        // Delete all the Plugin Options.
        foreach ($give_option_names as $option) {
            if (false !== strpos($option, 'give_cache')) {
                Give_Cache::delete($option);
            } else {
                delete_option($option);
            }
        }
    }
}