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<?php
/**
 * @author    Varun Sridharan <varunsridharan23@gmail.com>
 * @copyright 2018 Varun Sridharan
 * @license   GPLV3 Or Greater
 */

namespace Varunsridharan\WordPress;

if ( ! class_exists( '\Varunsridharan\WordPress\Localizer' ) ) {
    /**
     * Class Localizer
     *
     * @package Varunsridharan\WordPress
     * @author Varun Sridharan <varunsridharan23@gmail.com>
     * @since 1.0
     */
    class Localizer {
        /**
         * Stores All Instance.
         *
         * @var array
         */
        protected static $instances = array();

        /**
         * @var null
         */
        protected $slug = null;

        /**
         * @var bool
         */
        protected $script_tocheck = false;

        /**
         * js_args
         *
         * @var array
         */
        protected $js_args = array();

        /**
         * translations
         *
         * @var array
         */
        protected $translations = array();

        /**
         * @var bool
         */
        private $frontend = false;

        /**
         * @var bool
         */
        private $functions = false;

        /**
         * Localizer constructor.
         *
         * @param array $args
         */
        public function __construct( $args = array() ) {
            $args                 = wp_parse_args( $args, array(
                'id'        => false,
                'frontend'  => false,
                'functions' => false,
                'scripts'   => array(),
            ) );
            $this->slug           = $args['id'];
            $this->script_tocheck = $args['scripts'];
            $this->frontend       = $args['frontend'];
            $this->functions      = $args['functions'];

            add_action( 'admin_footer', array( &$this, 'backend_hook' ) );
            add_action( 'customize_controls_print_footer_scripts', array( &$this, 'backend_hook' ), 9999999999999 );
            add_action( 'wp_footer', array( &$this, 'frontend_hook' ) );
        }

        /**
         * Returns A New Instance.
         *
         * @param array|string $args
         *
         * @return bool|mixed|$this|\Varunsridharan\WordPress\Localizer
         */
        public static function instance( $args = array() ) {
            if ( isset( $args['id'] ) ) {
                if ( ! isset( self::$instances[ $args['id'] ] ) ) {
                    self::$instances[ $args['id'] ] = new static( $args );
                }
                return self::$instances[ $args['id'] ];
            }
            return ( is_string( $args ) && isset( self::$instances[ $args ] ) ) ? self::$instances[ $args ] : false;
        }

        /**
         * Back End Hook.
         */
        public function backend_hook() {
            echo $this->render_js_args();
            if ( true === $this->functions ) {
                echo $this->print_js_function();
            }
        }

        /**
         * Frontend Hook.
         */
        public function frontend_hook() {
            if ( $this->frontend ) {
                echo $this->render_js_args();
                if ( $this->functions ) {
                    echo $this->print_js_function();
                }
            }
        }

        /**
         * Adds a given object to array based on the ID.
         *
         * @param string $object_id
         * @param array  $args
         * @param bool   $merge
         * @param bool   $convert_js_funcion
         *
         * @return self|$this
         */
        public function add( $object_id = '', $args = array(), $merge = true, $convert_js_funcion = true ) {
            if ( true === $convert_js_funcion ) {
                $args = $this->handle_js_function( $args );
            }
            if ( true === $merge && isset( $this->js_args[ $object_id ] ) ) {
                $this->js_args[ $object_id ] = wp_parse_args( $args, $this->js_args[ $object_id ] );
            } else {
                $this->js_args[ $object_id ] = $args;
            }
            return $this;
        }

        /**
         * Converts Javascript Function into array.
         *
         * @param $args
         *
         * @return mixed
         */
        protected function handle_js_function( $args ) {
            if ( empty( $args ) || false === is_array( $args ) || true === is_object( $args ) ) {
                return $args;
            }
            foreach ( $args as $i => $ar ) {
                if ( is_array( $ar ) ) {
                    $args[ $i ] = $this->handle_js_function( $ar );
                } elseif ( is_string( $ar ) ) {
                    $re = '/\bfunction[ ]{0,1}(\(((?>[^()]+|(?-2))*)\))(\{((?>[^{}]+|(?-2))*)\})/';
                    preg_match_all( $re, $ar, $matches, PREG_SET_ORDER, 0 );
                    if ( is_array( $matches ) && ! empty( array_filter( $matches ) ) ) {
                        $args[ $i ] = array(
                            'js_args'     => false,
                            'js_contents' => false,
                        );
                        if ( isset( $matches[0][2] ) ) {
                            $args[ $i ]['js_args'] = ( empty( $matches[0][2] ) ) ? false : $matches[0][2];
                        }
                        if ( isset( $matches[0][4] ) ) {
                            $args[ $i ]['js_contents'] = ( empty( $matches[0][4] ) ) ? false : $matches[0][4];
                        }
                    }
                }
            }
            return $args;
        }

        /**
         * Custom Text which will be used in JS.
         *
         * @param string $key
         * @param string $value
         *
         * @return $this
         */
        public function text( $key = '', $value = '' ) {
            $this->translations[ $key ] = $value;
            return $this;
        }

        /**
         * @return mixed
         */
        public function render_js_args() {
            do_action( $this->slug . '_before_render_js_args' );

            if ( defined( 'DOING_AJAX' ) && true === DOING_AJAX ) {
                return $this->print_js_data();
            }

            if ( ! empty( $this->script_tocheck ) ) {
                foreach ( $this->script_tocheck as $script ) {
                    if ( true === wp_script_is( $script ) && false === wp_script_is( $script, 'done' ) ) {
                        $this->localize_script( $script );
                        return '';
                    }
                }
            }
            return $this->print_js_data();
        }

        /**
         * Uses WP-Script-API To Localize script.
         *
         * @param string $handle
         *
         * @return boolean
         */
        protected function localize_script( $handle = '' ) {
            foreach ( $this->js_args as $key => $value ) {
                $key = str_replace( '-', '_', $key );
                wp_localize_script( $handle, $key, $value );
            }

            wp_localize_script( $handle, $this->slug . '_il8n', $this->translations );
            return true;
        }

        /**
         * @param $object_name
         * @param $l10n
         *
         * @static
         * @return string
         */
        public static function php_to_js( $object_name, $l10n ) {
            return 'var ' . $object_name . ' = ' . wp_json_encode( self::js_args_encode( $l10n ) ) . ';';
        }

        /**
         * Encodes PHP Array in JSString.
         *
         * @param $l10n
         *
         * @return array|string
         * @static
         */
        public static function js_args_encode( $l10n ) {
            if ( is_array( $l10n ) ) {
                foreach ( (array) $l10n as $key => $value ) {
                    if ( is_scalar( $value ) ) {
                        $l10n[ $key ] = html_entity_decode( (string) $value, ENT_QUOTES, 'UTF-8' );
                    }
                }
            } else {
                $l10n = html_entity_decode( (string) $l10n, ENT_QUOTES, 'UTF-8' );
            }
            return $l10n;
        }

        /**
         * Outputs Raw HTML of js info.
         */
        protected function print_js_data() {
            $slug = $this->slug . '_field_js_vars';
            $args = self::php_to_js( $this->slug, $this->js_args );
            $txt  = self::php_to_js( $this->slug . '_il8n', $this->translations );
            return '<script type="text/javascript" id="' . $slug . '">/* <![CDATA[ */ ' . $args . ' ' . $txt . '/* ]]> */ </script>';
        }

        /**
         * Prints Custom Javascript Functions.
         *
         * @return string
         */
        private function print_js_function() {
            $script = '<script type="text/javascript" id="' . $this->slug . '_functions"> ';

            $script .= '
function ' . $this->slug . '_option ($key,$default){ 
    $default = $default || false; 
    if($key && "undefined" !== typeof window.' . $this->slug . '[$key] || undefined !== window.' . $this->slug . '[$key]){
        return JSON.parse( JSON.stringify( window.' . $this->slug . '[$key] ) ); 
    }
return $default; 
}';
            $script .= '
function ' . $this->slug . '_text($key,$default){ 
    $default = $default || "string_not_found"; 
    if ($key && "undefined" !== typeof window["' . $this->slug . '_il8n"][$key]||  window["' . $this->slug . '_il8n"][$key] !== undefined ) { 
        return window["' . $this->slug . '_il8n"][$key]; 
    } 
return $default; 
}';
            $script .= '</script>';
            return $script;
        }
    }
}