<?php

function create_block($namespace, $name, $params, $render_callback)
{
    static $config = null;

    if (!isset($config) && is_admin()) {
        $config = [];

        add_action(
            'init',
            function () use ($namespace, &$config) {
                wp_add_inline_script('wp-editor', 'loadGutenbergShortcodeBlocks();');
                add_action(
                    'admin_footer',
                    function () use ($namespace, &$config) {
                        ?>
                        <script>
                            function loadGutenbergShortcodeBlocks() {
                                var wp = window.wp;
                                var registerBlockType = wp.blocks.registerBlockType;
                                var el = wp.element.createElement;
                                var __ = wp.i18n.__;

                                function clone(obj) {
                                    if (null == obj || "object" != typeof obj) return obj;
                                    var copy = obj.constructor();
                                    for (var attr in obj) {
                                        if (obj.hasOwnProperty(attr)) copy[attr] = obj[attr];
                                    }
                                    return copy;
                                }

                                var config = <?= json_encode($config) ?>;

                                for (var blockName in config) {
                                    if (!config.hasOwnProperty(blockName)) {
                                        continue;
                                    }
                                    var blockConfig = config[blockName];

                                    var generateController = function (blockConfig) {
                                        return function (props) {
                                            var content = [el('h5', {}, blockConfig.title)];

                                            for (var attributeName in blockConfig.attributes) {
                                                if (!blockConfig.attributes.hasOwnProperty(attributeName)) {
                                                    continue;
                                                }
                                                var attrConfig = blockConfig.attributes[attributeName];

                                                if (attrConfig.options) {
                                                    var editor = el(wp.components.SelectControl, {
                                                        value: props.attributes[attributeName],
                                                        options: attrConfig.options,
                                                        onChange: function (content) {
                                                            props.setAttributes({[attributeName]: content});
                                                        },
                                                    });
                                                } else {
                                                    var editor = el(wp.editor.PlainText, {
                                                        value: props.attributes[attributeName],
                                                        placeholder: attrConfig.label,
                                                        required: true,
                                                        onChange: function (content) {
                                                            props.setAttributes({[attributeName]: content});
                                                        },
                                                    });
                                                }

                                                content.push(el('label', {}, attrConfig.label, editor));
                                            }

                                            return el('div', {style: {backgroundColor: '#f8f9f9', padding: '14px'}}, content);
                                        }
                                    };

                                    registerBlockType(<?= json_encode($namespace)  ?> +'/' + blockName, {
                                        title: blockConfig.title,
                                        category: <?= json_encode($namespace)  ?>,
                                        icon: blockConfig.icon,
                                        attributes: clone(blockConfig.attributes),
                                        edit: generateController(blockConfig),
                                        save: function () {
                                            return null;
                                        }
                                    });
                                }


                            };
                        </script>
                        <?php
                    },
                    9999
                );

                // Register block category
                add_filter(
                    'block_categories',
                    function ($categories, $post) use ($namespace) {
                        if ($post->post_type !== 'post') {
                            return $categories;
                        }
                        return array_merge(
                            $categories,
                            [
                                [
                                    'slug'  => $namespace,
                                    'title' => $namespace
                                ],
                            ]
                        );
                    },
                    10,
                    2
                );
            }
        );

    }

    $config[$name] = $params;

    $render = function ($block_params) use ($render_callback, $params) {
        // Set default parameters
        foreach ($params['attributes'] as $k => $param_info) {
            if (!array_key_exists($k, $block_params)) {
                $block_params[$k] = $param_info['default'];
            }
        }
        return call_user_func($render_callback, $block_params);
    };

    // Register shortcode
    add_shortcode($name, $render);

    // Register Gutenberg block
    if (function_exists('register_block_type')) {
        add_action(
            'init',
            function () use ($namespace, $name, $render) {
                register_block_type(
                    "{$namespace}/{$name}",
                    [
                        'attributes'      => [
                            'match' => ['type' => 'string'],
                            'side'  => ['type' => 'string']
                        ],
                        'render_callback' => $render
                    ]
                );
            }
        );
    }
}

// Usage
create_block(
    'mycompany',
    'hello-word',
    [
        'title'      => __('Hello world'),
        'icon'       => 'groups',
        'attributes' => [
            'name' => [
                'label'   => __('Name'),
                'type'    => 'string',
                'default' => 'World'
            ]
        ]
    ],
    function ($params) {
        return "Hello " . $params['name'];
    }
);