<?php
/**
 * Plugin upgrade notice
 *
 * Used to show an extra note when a big change is coming.
 *
 * @package SimplePay\Core\Admin\Plugin_Upgrade_Notice
 * @copyright Copyright (c) 2020, Sandhills Development, LLC
 * @license http://opensource.org/licenses/gpl-2.0.php GNU Public License
 * @since 3.5.0
 */

namespace SimplePay\Core\Admin\Plugin_Upgrade_Notice;

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

/**
 * Show inline plugin update message from remote readme.txt `== Upgrade Notice ==` section.
 *
 * @since 3.5.0
 *
 * @param array  $args     Unused parameter.
 * @param object $response Plugin update response.
 */
function in_plugin_update_message( $args, $response ) {
	$new_version    = $response->new_version;
	$upgrade_notice = get_upgrade_notice( $new_version );

	/**
	 * Filter the inline plugin upgrade notice message.
	 *
	 * @since unknown
	 *
	 * @param string $message
	 */
	echo apply_filters(
		'simpay_in_plugin_update_message',
		$upgrade_notice ? '</p>' . wp_kses_post( $upgrade_notice ) . '<p class="dummmy" style="display: none;">' : ''
	); // phpcs:ignore WordPress.XSS.EscapeOutput.OutputNotEscaped
}
add_action(
	'in_plugin_update_message-' . plugin_basename( SIMPLE_PAY_MAIN_FILE ),
	__NAMESPACE__ . '\\in_plugin_update_message',
	10,
	2
);

/**
 * Get the upgrade notice from hosted readme.txt file.
 *
 * @since 3.5.0
 *
 * @param string $version Plugin's new version.
 * @return string
 */
function get_upgrade_notice( $version ) {
	$transient_name = 'simpay_upgrade_notice_' . $version;
	$upgrade_notice = get_transient( $transient_name );

	$response = '';

	if ( false === $upgrade_notice ) {

		// @todo Use a filter and properly override in Pro code.
		if ( class_exists( 'SimplePay\Pro\SimplePayPro' ) ) {
			$response = wp_safe_remote_get( 'https://wpsimplepay.com/readmes/pro3/readme.txt' );
		} else {
			$response = wp_safe_remote_get( 'https://plugins.svn.wordpress.org/stripe/trunk/readme.txt' );
		}

		if ( ! is_wp_error( $response ) && ! empty( $response['body'] ) ) {
			$upgrade_notice = parse_update_notice( $response['body'], $version );

			set_transient( $transient_name, $upgrade_notice, HOUR_IN_SECONDS * 12 );
		}
	}

	return $upgrade_notice;
}

/**
 * Parse update notice from readme.txt file.
 *
 * @since 3.5.0
 *
 * @param  string $content readme.txt file content.
 * @param  string $new_version Plugin's new version.
 * @return string
 */
function parse_update_notice( $content, $new_version ) {
	$notice_regexp          = '~==\s*Upgrade Notice\s*==\s*=\s*(.*)\s*=(.*)(=\s*' . preg_quote( $new_version ) . '\s*=|$)~Uis';
	$upgrade_notice         = '';
	$upgrade_notice_version = '';

	if ( version_compare( SIMPLE_PAY_VERSION, $new_version, '>' ) ) {
		return '';
	}

	$matches = null;

	if ( preg_match( $notice_regexp, $content, $matches ) ) {
		$notices = (array) preg_split( '~[\r\n]+~', trim( $matches[2] ) );

		$upgrade_notice_version = trim( $matches[1] );

		if ( version_compare( SIMPLE_PAY_VERSION, $upgrade_notice_version, '<' ) ) {
			$upgrade_notice .= '<div class="simpay-plugin-upgrade-notice">';

			foreach ( $notices as $index => $line ) {
				$upgrade_notice .= preg_replace( '~\[([^\]]*)\]\(([^\)]*)\)~', '<a href="${2}">${1}</a>', $line );
			}

			$upgrade_notice .= '</div>';
		}
	}

	return wp_kses_post( $upgrade_notice );
}