<?php
namespace YayMail\License;

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

/**
 * EDD_SL_Plugin_Updater
 *
 * @package EDD_SL_Plugin_Updater
 */
class EDD_SL_Plugin_Updater {

    private $api_url     = '';
    private $api_data    = [];
    private $name        = '';
    private $slug        = '';
    private $version     = '';
    private $wp_override = false;
    private $beta        = false;
    private $cache_key   = '';

    private $health_check_timeout = 5;

    /**
     * Class constructor.
     *
     * @uses plugin_basename()
     * @uses hook()
     *
     * @param string $_api_url     The URL pointing to the custom API endpoint.
     * @param string $_plugin_file Path to the plugin file.
     * @param array  $_api_data    Optional data to send with API calls.
     */
    public function __construct( $_api_url, $_plugin_file, $_api_data = null ) {

        global $edd_plugin_data;

        $this->api_url     = trailingslashit( $_api_url );
        $this->api_data    = $_api_data;
        $this->name        = plugin_basename( $_plugin_file );
        $this->slug        = basename( $_plugin_file, '.php' );
        $this->version     = $_api_data['version'];
        $this->wp_override = isset( $_api_data['wp_override'] ) ? (bool) $_api_data['wp_override'] : false;
        $this->beta        = ! empty( $this->api_data['beta'] ) ? true : false;
        $this->cache_key   = 'edd_sl_' . md5( serialize( $this->slug . $this->api_data['license'] . $this->beta ) );

        $edd_plugin_data[ $this->slug ] = $this->api_data;

        /**
         * Fires after the $edd_plugin_data is setup.
         *
         * @since x.x.x
         *
         * @param array $edd_plugin_data Array of EDD SL plugin data.
         */
        do_action( 'post_edd_sl_plugin_updater_setup', $edd_plugin_data );

        // Set up hooks.
        $this->init();
    }

    /**
     * Set up WordPress filters to hook into WP's update process.
     *
     * @uses add_filter()
     *
     * @return void
     */
    public function init() {

        add_filter( 'pre_set_site_transient_update_plugins', [ $this, 'check_update' ] );
        add_filter( 'plugins_api', [ $this, 'plugins_api_filter' ], 10, 3 );
        // add_action( 'load-plugins.php', array( $this, 'remove_default_after_row' ), 100 );
        add_action( 'after_plugin_row_' . $this->name, [ $this, 'show_update_notification' ], 11, 2 );
        add_action( 'admin_init', [ $this, 'show_changelog' ] );
    }

    public function remove_default_after_row() {
        remove_action( 'after_plugin_row_' . $this->name, 'wp_plugin_update_row', 10, 2 );
    }

    /**
     * Check for Updates at the defined API endpoint and modify the update array.
     *
     * This function dives into the update API just when WordPress creates its update array,
     * then adds a custom API call and injects the custom plugin data retrieved from the API.
     * It is reassembled from parts of the native WordPress plugin update code.
     * See wp-includes/update.php line 121 for the original wp_update_plugins() function.
     *
     * @uses api_request()
     *
     * @param array $_transient_data Update array build by WordPress.
     * @return array Modified update array with custom plugin data.
     */
    public function check_update( $_transient_data ) {

        global $pagenow;

        if ( ! is_object( $_transient_data ) ) {
            $_transient_data = new \stdClass();
        }

        if ( 'plugins.php' == $pagenow ) {
            return $_transient_data;
        }

        if ( ! empty( $_transient_data->response ) && ! empty( $_transient_data->response[ $this->name ] ) && false === $this->wp_override ) {
            return $_transient_data;
        }

        $current = $this->get_repo_api_data();
        if ( false !== $current && is_object( $current ) && isset( $current->new_version ) ) {
            if ( version_compare( $this->version, $current->new_version, '<' ) ) {
                $_transient_data->response[ $this->name ] = $current;
            } else {
                // Populating the no_update information is required to support auto-updates in WordPress 5.5.
                $_transient_data->no_update[ $this->name ] = $current;
            }
        }
        $_transient_data->last_checked           = time();
        $_transient_data->checked[ $this->name ] = $this->version;

        return $_transient_data;
    }

    /**
     * Get repo API data from store.
     * Save to cache.
     *
     * @return \stdClass
     */
    public function get_repo_api_data() {
        $version_info = $this->get_cached_version_info();

        if ( false === $version_info ) {
            $version_info = $this->api_request(
                'plugin_latest_version',
                [
                    'slug' => $this->slug,
                    'beta' => $this->beta,
                ]
            );
            if ( ! $version_info ) {
                return false;
            }

            // This is required for your plugin to support auto-updates in WordPress 5.5.
            $version_info->plugin = $this->name;
            $version_info->id     = $this->name;

            $this->set_version_info_cache( $version_info );
        }

        return $version_info;
    }

    public function yaycommerce_update_transient() {
        if ( is_network_admin() ) {
            return;
        }

        if ( ! current_user_can( 'update_plugins' ) ) {
            return;
        }

        // Remove our filter on the site transient
        remove_filter( 'pre_set_site_transient_update_plugins', [ $this, 'check_update' ], 10 );

        $update_cache = get_site_transient( 'update_plugins' );

        $update_cache = is_object( $update_cache ) ? $update_cache : new \stdClass();

        if ( empty( $update_cache->response ) || empty( $update_cache->response[ $this->name ] ) ) {

            $version_info = $this->get_repo_api_data();

            if ( false === $version_info ) {
                $version_info = $this->api_request(
                    'plugin_latest_version',
                    [
                        'slug' => $this->slug,
                        'beta' => $this->beta,
                    ]
                );

                // Since we disabled our filter for the transient, we aren't running our object conversion on banners, sections, or icons. Do this now:
                if ( isset( $version_info->banners ) && ! is_array( $version_info->banners ) ) {
                    $version_info->banners = $this->convert_object_to_array( $version_info->banners );
                }

                if ( isset( $version_info->sections ) && ! is_array( $version_info->sections ) ) {
                    $version_info->sections = $this->convert_object_to_array( $version_info->sections );
                }

                if ( isset( $version_info->icons ) && ! is_array( $version_info->icons ) ) {
                    $version_info->icons = $this->convert_object_to_array( $version_info->icons );
                }

                if ( isset( $version_info->contributors ) && ! is_array( $version_info->contributors ) ) {
                    $version_info->contributors = $this->convert_object_to_array( $version_info->contributors );
                }

                $this->set_version_info_cache( $version_info );
            }//end if

            if ( ! is_object( $version_info ) ) {
                return;
            }

            $has_update = false;
            if ( version_compare( $this->version, $version_info->new_version, '<' ) ) {
                $update_cache->response[ $this->name ] = $version_info;
                $has_update                            = true;
            } else {
                $update_cache->no_update[ $this->name ] = $version_info;
            }

            $update_cache->last_checked           = time();
            $update_cache->checked[ $this->name ] = $this->version;

            if ( $has_update ) {
                set_site_transient( 'update_plugins', $update_cache );
            }
        } else {

            $version_info = $update_cache->response[ $this->name ];

        }//end if
    }

    /**
     * Show update nofication row -- needed for multisite subsites, because WP won't tell you otherwise!
     *
     * @param string $file
     * @param array  $plugin
     */
    public function show_update_notification( $file, $plugin ) {
        $output = '';

        if ( $this->name != $file ) {
            return $output;
        }

        $this->yaycommerce_update_transient();

        $update_cache = get_site_transient( 'update_plugins' );
        $update_cache = is_object( $update_cache ) ? $update_cache : new \stdClass();
        $version_info = isset( $update_cache->response[ $this->name ] ) ? $update_cache->response[ $this->name ] : '';

        // Restore our filter
        add_filter( 'pre_set_site_transient_update_plugins', [ $this, 'check_update' ] );

        do_action( "in_plugin_update_message-{$file}", $plugin, $version_info );

        echo wp_kses_post( $output );
    }

    /**
     * Updates information on the "View version x.x details" page with custom data.
     *
     * @uses api_request()
     *
     * @param mixed  $_data
     * @param string $_action
     * @param object $_args
     * @return object $_data
     */
    public function plugins_api_filter( $_data, $_action = '', $_args = null ) {

        if ( 'plugin_information' != $_action ) {

            return $_data;

        }

        if ( ! isset( $_args->slug ) || ( $_args->slug != $this->slug ) ) {

            return $_data;

        }

        $to_send = [
            'slug'   => $this->slug,
            'is_ssl' => is_ssl(),
            'fields' => [
                'banners' => [],
                'reviews' => false,
                'icons'   => [],
            ],
        ];

        // Get the transient where we store the api request for this plugin for 24 hours
        $edd_api_request_transient = $this->get_cached_version_info();

        // If we have no transient-saved value, run the API, set a fresh transient with the API value, and return that value too right now.
        if ( empty( $edd_api_request_transient ) ) {

            $api_response = $this->api_request( 'plugin_information', $to_send );

            // Expires in 3 hours
            $this->set_version_info_cache( $api_response );

            if ( false !== $api_response ) {
                $_data = $api_response;
            }
        } else {
            $_data = $edd_api_request_transient;
        }

        // Convert sections into an associative array, since we're getting an object, but Core expects an array.
        if ( isset( $_data->sections ) && ! is_array( $_data->sections ) ) {
            $_data->sections = $this->convert_object_to_array( $_data->sections );
        }

        // Convert banners into an associative array, since we're getting an object, but Core expects an array.
        if ( isset( $_data->banners ) && ! is_array( $_data->banners ) ) {
            $_data->banners = $this->convert_object_to_array( $_data->banners );
        }

        // Convert icons into an associative array, since we're getting an object, but Core expects an array.
        if ( isset( $_data->icons ) && ! is_array( $_data->icons ) ) {
            $_data->icons = $this->convert_object_to_array( $_data->icons );
        }

        // Convert contributors into an associative array, since we're getting an object, but Core expects an array.
        if ( isset( $_data->contributors ) && ! is_array( $_data->contributors ) ) {
            $_data->contributors = $this->convert_object_to_array( $_data->contributors );
        }

        if ( ! isset( $_data->plugin ) ) {
            $_data->plugin = $this->name;
        }

        return $_data;
    }

    /**
     * Convert some objects to arrays when injecting data into the update API
     *
     * Some data like sections, banners, and icons are expected to be an associative array, however due to the JSON
     * decoding, they are objects. This method allows us to pass in the object and return an associative array.
     *
     * @since 3.6.5
     *
     * @param stdClass $data
     *
     * @return array
     */
    private function convert_object_to_array( $data ) {
        $new_data = [];
        foreach ( $data as $key => $value ) {
            $new_data[ $key ] = is_object( $value ) ? $this->convert_object_to_array( $value ) : $value;
        }

        return $new_data;
    }

    /**
     * Disable SSL verification in order to prevent download update failures
     *
     * @param array  $args
     * @param string $url
     * @return object $array
     */
    public function http_request_args( $args, $url ) {

        $verify_ssl = $this->verify_ssl();
        if ( strpos( $url, 'https://' ) !== false && strpos( $url, 'edd_action=package_download' ) ) {
            $args['sslverify'] = $verify_ssl;
        }
        return $args;
    }

    /**
     * Calls the API and, if successfull, returns the object delivered by the API.
     *
     * @uses get_bloginfo()
     * @uses wp_remote_post()
     * @uses is_wp_error()
     *
     * @param string $_action The requested action.
     * @param array  $_data   Parameters for the API action.
     * @return false|object
     */
    private function api_request( $_action, $_data ) {

        global $wp_version, $edd_plugin_url_available;

        $verify_ssl = $this->verify_ssl();

        // Do a quick status check on this domain if we haven't already checked it.
        $store_hash = md5( $this->api_url );
        if ( ! is_array( $edd_plugin_url_available ) || ! isset( $edd_plugin_url_available[ $store_hash ] ) ) {
            $test_url_parts = parse_url( $this->api_url );

            $scheme = ! empty( $test_url_parts['scheme'] ) ? $test_url_parts['scheme'] : 'http';
            $host   = ! empty( $test_url_parts['host'] ) ? $test_url_parts['host'] : '';
            $port   = ! empty( $test_url_parts['port'] ) ? ':' . $test_url_parts['port'] : '';

            if ( empty( $host ) ) {
                $edd_plugin_url_available[ $store_hash ] = false;
            } else {
                $test_url                                = $scheme . '://' . $host . $port;
                $response                                = wp_remote_get(
                    $test_url,
                    [
                        'timeout'   => $this->health_check_timeout,
                        'sslverify' => $verify_ssl,
                    ]
                );
                $edd_plugin_url_available[ $store_hash ] = is_wp_error( $response ) ? false : true;
            }
        }//end if

        if ( false === $edd_plugin_url_available[ $store_hash ] ) {
            return false;
        }

        $data = array_merge( $this->api_data, $_data );

        if ( $data['slug'] != $this->slug ) {
            return false;
        }

        if ( trailingslashit( home_url() ) == $this->api_url ) {
            return false;
            // Don't allow a plugin to ping itself
        }

        $api_params = [
            'edd_action' => 'get_version',
            'license'    => ! empty( $data['license'] ) ? $data['license'] : '',
            'item_name'  => isset( $data['item_name'] ) ? $data['item_name'] : false,
            'item_id'    => isset( $data['item_id'] ) ? $data['item_id'] : false,
            'version'    => isset( $data['version'] ) ? $data['version'] : false,
            'slug'       => $data['slug'],
            'author'     => $data['author'],
            'url'        => home_url(),
            'beta'       => ! empty( $data['beta'] ),
        ];

        $request = wp_remote_post(
            $this->api_url,
            [
                'timeout'   => 15,
                'sslverify' => $verify_ssl,
                'body'      => $api_params,
            ]
        );

        if ( ! is_wp_error( $request ) ) {
            $request = json_decode( wp_remote_retrieve_body( $request ) );
        }

        if ( $request && isset( $request->sections ) ) {
            $request->sections = maybe_unserialize( $request->sections );
        } else {
            $request = false;
        }

        if ( $request && isset( $request->banners ) ) {
            $request->banners = maybe_unserialize( $request->banners );
        }

        if ( $request && isset( $request->icons ) ) {
            $request->icons = maybe_unserialize( $request->icons );
        }

        if ( ! empty( $request->sections ) ) {
            foreach ( $request->sections as $key => $section ) {
                $request->$key = (array) $section;
            }
        }

        return $request;
    }

    /**
     * If available, show the changelog for sites in a multisite install.
     */
    public function show_changelog() {

        global $edd_plugin_data;

        if ( empty( $_REQUEST['edd_sl_action'] ) || 'view_plugin_changelog' != $_REQUEST['edd_sl_action'] ) {
            return;
        }

        if ( empty( $_REQUEST['plugin'] ) ) {
            return;
        }

        if ( empty( $_REQUEST['slug'] ) ) {
            return;
        }

        if ( ! current_user_can( 'update_plugins' ) ) {
            wp_die( esc_html__( 'You do not have permission to install plugin updates', 'easy-digital-downloads' ), esc_html__( 'Error', 'easy-digital-downloads' ), [ 'response' => 403 ] );
        }

        $data         = $edd_plugin_data[ sanitize_text_field( $_REQUEST['slug'] ) ];
        $version_info = $this->get_cached_version_info();

        if ( false === $version_info ) {

            $api_params = [
                'edd_action' => 'get_version',
                'item_name'  => isset( $data['item_name'] ) ? $data['item_name'] : false,
                'item_id'    => isset( $data['item_id'] ) ? $data['item_id'] : false,
                'slug'       => sanitize_text_field( $_REQUEST['slug'] ),
                'author'     => $data['author'],
                'url'        => home_url(),
                'beta'       => ! empty( $data['beta'] ),
            ];

            $verify_ssl = $this->verify_ssl();
            $request    = wp_remote_post(
                $this->api_url,
                [
                    'timeout'   => 15,
                    'sslverify' => $verify_ssl,
                    'body'      => $api_params,
                ]
            );

            if ( ! is_wp_error( $request ) ) {
                $version_info = json_decode( wp_remote_retrieve_body( $request ) );
            }

            if ( ! empty( $version_info ) && isset( $version_info->sections ) ) {
                $version_info->sections = maybe_unserialize( $version_info->sections );
            } else {
                $version_info = false;
            }

            if ( ! empty( $version_info ) ) {
                foreach ( $version_info->sections as $key => $section ) {
                    $version_info->$key = (array) $section;
                }
            }

            $this->set_version_info_cache( $version_info );

            // Delete the unneeded option
            delete_option( md5( 'edd_plugin_' . sanitize_key( $_REQUEST['plugin'] ) . '_' . $this->beta . '_version_info' ) );
        }//end if

        if ( isset( $version_info->sections ) ) {
            $sections = $this->convert_object_to_array( $version_info->sections );
            if ( ! empty( $sections['changelog'] ) ) {
                echo '<div style="background:#fff;padding:10px;">' . wp_kses_post( $sections['changelog'] ) . '</div>';
            }
        }

        exit;
    }

    /**
     * Gets the plugin's cached version information from the database.
     *
     * @param string $cache_key
     * @return boolean|string
     */
    public function get_cached_version_info( $cache_key = '' ) {

        if ( empty( $cache_key ) ) {
            $cache_key = $this->cache_key;
        }

        $cache = get_option( $cache_key );

        if ( empty( $cache['timeout'] ) || time() > $cache['timeout'] ) {
            return false;
            // Cache is expired
        }

        // We need to turn the icons into an array, thanks to WP Core forcing these into an object at some point.
        $cache['value'] = json_decode( $cache['value'] );
        if ( ! empty( $cache['value']->icons ) ) {
            $cache['value']->icons = (array) $cache['value']->icons;
        }

        return $cache['value'];
    }

    /**
     * Adds the plugin version information to the database.
     *
     * @param string $value
     * @param string $cache_key
     */
    public function set_version_info_cache( $value = '', $cache_key = '' ) {

        if ( empty( $cache_key ) ) {
            $cache_key = $this->cache_key;
        }

        $data = [
            'timeout' => strtotime( '+3 hours', time() ),
            'value'   => json_encode( $value ),
        ];

        update_option( $cache_key, $data, 'no' );

        // Delete the duplicate option
        delete_option( 'edd_api_request_' . md5( serialize( $this->slug . $this->api_data['license'] . $this->beta ) ) );
    }

    /**
     * Returns if the SSL of the store should be verified.
     *
     * @since  1.6.13
     * @return bool
     */
    private function verify_ssl() {
        return (bool) apply_filters( 'edd_sl_api_request_verify_ssl', true, $this );
    }
}