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<?php

defined( 'ABSPATH' ) || exit;

if ( ! class_exists( 'VSP_Framework_Loader' ) ) {
    /**
     * Class VSP_Framework_Loader
     *
     * @author Varun Sridharan <varunsridharan23@gmail.com>
     */
    final class VSP_Framework_Loader {
        /**
         * Variable to store VSP_Framework_Loader Class instance
         *
         * @var \VSP_Framework_Loader
         */
        public static $_instance = null;

        /**
         * Stores the loaded vsp framework information
         *
         * @var array
         */
        public static $_loaded = array();

        /**
         * Maintaines All Plugins VSP Framework Details and provides them when required
         *
         * @var array
         */
        public static $data = array();

        /**
         * Array of callback to init all plugins after vsp_framework loaded
         *
         * @var array
         */
        public static $callbacks = array();

        /**
         * VSP_Framework_Loader constructor.
         */
        public function __construct() {
            add_action( 'wponion/loaded', [ &$this, 'load_framework' ], 0 );
            add_action( 'vsp/loaded', [ &$this, 'load_plugins' ], -1 );
            add_action( 'wponion/sysinfo/datas', [ &$this, 'add_extra_info' ] );
        }

        /**
         * Adds Custom Information To SysPage.
         *
         * @param array $_meta .
         *
         * @return array
         */
        public function add_extra_info( $_meta = array() ) {
            $meta       = array();
            $vsp_loaded = $this->loaded();

            $meta['Framework Version']     = $vsp_loaded['Version'];
            $meta['Textdomain']            = $vsp_loaded['TextDomain'];
            $meta['DomainPath']            = $vsp_loaded['DomainPath'];
            $meta['Framework Plugin Path'] = $vsp_loaded['plugin_path'];
            $meta['Framework Path']        = $vsp_loaded['framework_path'];
            $meta['Framework Included']    = self::$data;
            $_meta['VSP Framework']        = $meta;
            return $_meta;
        }

        /**
         * Loads Framework From A Plugin which has the latest version
         */
        public function load_framework() {
            if ( empty( self::$_loaded ) ) {
                $lists  = self::get();
                $latest = max( array_keys( $lists ) );
                $info   = ( isset( $lists[ $latest ] ) ) ? $lists[ $latest ] : [];
                if ( empty( $info ) ) {
                    $msg = base64_encode( wp_json_encode( self::$data ) );
                    $ms  = 'Unable To Load VSP Framework. Please Contact The Author';
                    $ms  = $ms . '<p style="word-break: break-all;"> <strong>' . 'ERROR ID : ' . '</strong>' . $msg . '</p>';
                    wp_die( $ms );
                }
                self::$_loaded = $info;
                require_once $info['framework_path'] . 'vsp-bootstrap.php';
            }
        }

        /**
         * Creates A Static Instances
         *
         * @return \VSP_Framework_Loader
         */
        public static function instance() {
            if ( null === self::$_instance ) {
                self::$_instance = new self();
            }
            return self::$_instance;
        }

        /**
         * Stores Framework Version & its details
         *
         * @param string $version framework version.
         * @param array  $data other information.
         *
         * @return $this
         */
        public function add( $version = '', $data = array() ) {
            self::$data[ $version ] = $data;
            return $this;
        }

        /**
         * Registers a plugin and stores its deta to $data
         *
         * @param string $plugin_path Exact Plugin path.
         * @param string $framework_path Foldername of the framework path.
         *
         * @return $this
         */
        public function register_plugin( $plugin_path = '', $framework_path = '/vsp-framework/' ) {
            $plugin_path    = trailingslashit( $plugin_path );
            $framework_path = trailingslashit( $plugin_path . $framework_path );

            if ( file_exists( $framework_path . 'vsp-bootstrap.php' ) ) {
                $info                   = get_file_data( $framework_path . 'vsp-bootstrap.php', [
                    'Name'       => 'Framework Name',
                    'Version'    => 'Version',
                    'TextDomain' => 'Text Domain',
                    'DomainPath' => 'Domain Path',
                ] );
                $info['plugin_path']    = trailingslashit( $plugin_path );
                $info['framework_path'] = $framework_path;
                self::add( $info['Version'], $info );
            }
            return $this;
        }

        /**
         * Returns all registered plugins information
         *
         * @return array
         */
        public function get() {
            return self::$data;
        }

        /**
         * Returns currectly loaded framework information
         *
         * @return array
         */
        public function loaded() {
            return self::$_loaded;
        }

        /**
         * Registers a callback to trigger when vsp_framework is loaded
         * usefull for plugins that dose not path vsp in-it
         *
         * @param array $callback .
         *
         * @return bool
         */
        public function register_callback( $callback = array() ) {
            self::$callbacks[] = $callback;
            return true;
        }

        /**
         * Loads all plugin that is registered with VSP Framework
         */
        public function load_plugins() {
            if ( ! empty( self::$callbacks ) ) {
                foreach ( self::$callbacks as $callback ) {
                    call_user_func_array( $callback, [] );
                }
            }
        }
    }
}

if ( ! function_exists( 'vsp_maybe_load' ) ) {
    /**
     * Adds Passed Plugin path to the list array which later used to compare and
     * load the framework from a plugin which has the latest version of framework
     *
     * @param array  $callback Custom function to callback when VSP is loaded.
     * @param string $plugin_path Plugin Path To register With VSP.
     * @param string $framework_path Exact path of the vsp framework in the plugin.
     */
    function vsp_maybe_load( $callback = [], $plugin_path = '', $framework_path = 'vsp-framework' ) {
        $plugin_path = ( ! empty( $plugin_path ) ) ? $plugin_path : __DIR__ . '/';
        VSP_Framework_Loader::instance()
            ->register_plugin( $plugin_path, $framework_path )
            ->register_callback( $callback );
    }
}

if ( ! function_exists( 'vsp_register_plugin' ) ) {
    /**
     * Registers Plugins To VSP Callback.
     *
     * @param array $callback .
     *
     * @return bool
     */
    function vsp_register_plugin( $callback = [] ) {
        return VSP_Framework_Loader::instance()->register_callback( $callback );
    }
}

if ( ! function_exists( 'vsp_force_load' ) ) {
    /**
     * This function is used to force load framework @ anytime.
     * This should be mainly used on Plugin Activation and deactivation.
     * Should not be used anywhere else.
     */
    function vsp_force_load() {
        VSP_Framework_Loader::instance()->load_framework();
    }
}

if ( ! function_exists( 'vsp_force_load_vendors' ) ) {
    /**
     * Loads Its libs.
     *
     * @return bool
     */
    function vsp_force_load_vendors() {
        if ( file_exists( __DIR__ . '/vendor/autoload.php' ) ) {
            include __DIR__ . '/vendor/autoload.php';
            return true;
        }
        return false;
    }
}