<?php
/**
 * Fired when the plugin is uninstalled.
 *
 * Deleting the plugin only removes its data when the site owner opted in via
 * the "Delete all Epic Forms data when the plugin is deleted" setting
 * (`delete_data_on_uninstall` inside the `epicforms_settings` option). With the
 * setting off — the default — every table, option and uploaded file survives,
 * so reinstalling brings the forms and submissions back.
 *
 * The setting is stored per site, so on multisite each site governs its own
 * data: the loop below visits every site but wipes only the ones that opted in.
 *
 * @link       https://epicformbuilder.com
 * @since      1.0.0
 *
 * @package    Epicformbuilder
 */

// If uninstall not called from WordPress, then exit.
if ( ! defined( 'WP_UNINSTALL_PLUGIN' ) ) {
	exit;
}

// The plugin itself is not loaded during uninstall, so pull in the one file
// that names its tables.
require_once __DIR__ . '/includes/class-epicformbuilder-tables.php';

/**
 * Removes every trace of the plugin from the current site.
 *
 * Does nothing unless the site opted in through the settings screen.
 *
 * @return void
 */
function epicforms_uninstall_site() {
	$settings = get_option( 'epicforms_settings', [] );

	if ( ! is_array( $settings ) || empty( $settings['delete_data_on_uninstall'] ) ) {
		return;
	}

	epicforms_uninstall_drop_tables();
	epicforms_uninstall_delete_options();
	epicforms_uninstall_delete_uploads();
	epicforms_uninstall_clear_cron();
}

/**
 * Drops the custom tables created by Epicformbuilder_Activator.
 *
 * @return void
 */
function epicforms_uninstall_drop_tables() {
	global $wpdb;

	foreach ( Epicformbuilder_Tables::all_prefixed( $wpdb->prefix ) as $table_name ) {
		// Table names cannot be bound as placeholders, and every name here comes
		// from a class constant joined to the current site's prefix. Dropping
		// the schema is the whole point of an opted-in uninstall.
		// phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared, WordPress.DB.DirectDatabaseQuery.SchemaChange, WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
		$wpdb->query( "DROP TABLE IF EXISTS `{$table_name}`" );
	}
}

/**
 * Deletes the options and transients the plugin writes.
 *
 * @return void
 */
function epicforms_uninstall_delete_options() {
	$options = [
		'epicforms_settings',
		'epicforms_show_made_by',
		'epic_forms_user_info',
		'epicforms_submission_token_secret',
		'epicforms_db_version',
	];

	foreach ( $options as $option ) {
		delete_option( $option );
	}

	$transients = [
		'epic_forms_code_verifier',
		'epic_forms_connection_valid',
		'epic_forms_oauth_state',
	];

	foreach ( $transients as $transient ) {
		delete_transient( $transient );
	}
}

/**
 * Deletes the plugin's uploads directory: logs, CSV exports and files
 * submitted through the file upload field.
 *
 * @return void
 */
function epicforms_uninstall_delete_uploads() {
	$upload_dir = wp_upload_dir();

	if ( ! empty( $upload_dir['error'] ) || empty( $upload_dir['basedir'] ) ) {
		return;
	}

	$base_dir   = realpath( $upload_dir['basedir'] );
	$plugin_dir = realpath( $upload_dir['basedir'] . '/epicforms' );

	if ( false === $base_dir || false === $plugin_dir ) {
		return;
	}

	// The uploads path is filterable, so make sure the resolved directory still
	// sits inside the uploads root before recursively deleting anything.
	if ( 0 !== strpos( $plugin_dir . DIRECTORY_SEPARATOR, trailingslashit( $base_dir ) ) ) {
		return;
	}

	if ( ! function_exists( 'WP_Filesystem' ) ) {
		require_once ABSPATH . 'wp-admin/includes/file.php';
	}

	global $wp_filesystem;

	// Without direct filesystem access there are no credentials to prompt for
	// during uninstall, so leave the files rather than fall back to raw
	// unlink()/rmdir() calls.
	if ( ! WP_Filesystem() || ! $wp_filesystem instanceof WP_Filesystem_Base ) {
		return;
	}

	$wp_filesystem->delete( $plugin_dir, true );
}

/**
 * Clears the hourly pending-values purge cron event.
 *
 * @return void
 */
function epicforms_uninstall_clear_cron() {
	wp_clear_scheduled_hook( 'epicforms_purge_pending_values' );
}

if ( is_multisite() ) {
	$epicforms_site_ids = get_sites(
		[
			'fields'                 => 'ids',
			'number'                 => 0,
			'update_site_meta_cache' => false,
		]
	);

	foreach ( $epicforms_site_ids as $epicforms_site_id ) {
		switch_to_blog( $epicforms_site_id );
		epicforms_uninstall_site();
		restore_current_blog();
	}

	unset( $epicforms_site_ids, $epicforms_site_id );
} else {
	epicforms_uninstall_site();
}