<?php
class ga_tc_update {
    /**
     * The plugin current version
     * @var string
     */
    private $current_version;

    /**
     * The plugin remote update path
     * @var string
     */
    private $update_path;

    /**
     * Plugin Slug (plugin_directory/plugin_file.php)
     * @var string
     */
    private $plugin_slug;

    /**
     * Plugin name (plugin_file)
     * @var string
     */
    private $slug;

    /**
     * Initialize a new instance of the WordPress Auto-Update class
     * @param string $current_version
     * @param string $update_path
     * @param string $plugin_slug
     */
    public function __construct( $current_version, $update_path, $plugin_slug )
    {
        // Set the class public variables
        $this->current_version = $current_version;
        $this->update_path = $update_path;

        // Set the Plugin Slug
        $this->plugin_slug = $plugin_slug;
        list ($t1, $t2) = explode( '/', $plugin_slug );
        $this->slug = str_replace( '.php', '', $t2 );

        // define the alternative API for updating checking
        add_filter( 'pre_set_site_transient_update_plugins', array( &$this, 'check_update' ) );

        // Define the alternative response for information checking
        add_filter( 'plugins_api', array( &$this, 'check_info' ), 11, 3 );
    }

    /**
     * Add our self-hosted autoupdate plugin to the filter transient
     *
     * @param $transient
     * @return object $ transient
     */
    public function check_update( $transient )
    {
        if ( empty( $transient->checked ) ) {
            return $transient;
        }

        // Get the remote version
        $remote_version = $this->getRemote_version();

        // If a newer version is available, add the update
        if ( version_compare( $this->current_version, $remote_version->new_version, '<' ) ) {
            $obj = new stdClass();
            $obj->slug = $this->slug;
            $obj->new_version = $remote_version->new_version;
            $obj->url = $remote_version->url;
            $obj->plugin = $this->plugin_slug;
            $obj->package = $remote_version->package;
            $obj->testes = $remote_version->tested;
            $transient->response[$this->plugin_slug] = $obj;
        }
        return $transient;
    }

    /**
     * Add our self-hosted description to the filter
     *
     * @param boolean $false
     * @param array $action
     * @param object $arg
     * @return bool|object
     */
    public function check_info($false, $action, $arg)
    {
        if (isset($arg->slug) && $arg->slug === $this->slug) {
            $information = $this->getRemote_information();


            return $information;
        }
        return false;
    }

    /**
     * Return the remote version
     * @return string $remote_version
     */
    public function getRemote_version()
    {
        return $this->getRemote('plugin-version');
    }

    /**
     * Get information about the remote version
     * @return bool|object
     */
    public function getRemote_information()
    {

        return $this->getRemote('plugin-info');
    }

    protected function getRemote($method) {
        $params = array(
            'method' => 'POST',
            'timeout' => 45,
            'redirection' => 5,
            'httpversion' => '1.0',
            'blocking' => true,
            'headers' => array(),
            'body' => array( 'url' => home_url() ),
            'cookies' => array(),
        );

        $request = wp_remote_post(GA_TC_SERVER . '/api/'.$method, $params);
        if ( !is_wp_error( $request ) || wp_remote_retrieve_response_code( $request ) === 200 ) {
            $answer = json_decode($request['body'], true);
            if (is_array($answer) && isset($answer['data']['info'])) {
                return (object)json_decode($answer['data']['info'], true);
            }
        }
        return false;
    }

    /**
     * Return the status of the plugin licensing
     * @return boolean $remote_license
     */
    public function getRemote_license()
    {
        $params = array(
            'body' => array(
                'action' => 'license',
                'license_user' => $this->license_user,
                'license_key' => $this->license_key,
            ),
        );
        $request = wp_remote_post( $this->update_path . 'pluginLicense', $params );
        if ( !is_wp_error( $request ) || wp_remote_retrieve_response_code( $request ) === 200 ) {
            $answer = json_decode($request['body'], true);
            return (object)json_decode($answer['data']['info'], true);
        }
        return false;
    }
}