<?php
// Autoload the blocks

add_action('plugins_loaded', function() {

    // Return if ACF PRO is not installed/active
    if(!function_exists('acf_register_block_type')) return;

    // Return if there is no directory 'blocks' in the current theme
    $block_path = apply_filters('first_blocks_path', get_template_directory() . '/blocks');
    if(!is_dir($block_path)) return;

    // Return if there are no block files inside the blocks directory
    $block_files = glob($block_path . '/*');
    if(!$block_files) return;

    // Initialize the array of allowed blocks ('core/block' is for reusable blocks)
    $allowed_blocks = ['core/block'];

    // Register blocks
    foreach($block_files as $block_file) {
        $block_data = get_file_data($block_file, [
            'title' => 'Title',
            'category' => 'Category',
            'icon' => 'Icon',
            'multiple' => 'Multiple'
        ]);

        if(!$block_data['title']) continue;

        $block_name = pathinfo($block_file)['filename'];
        $allowed_blocks[] = 'acf/' . $block_name;

        $block_settings = [
            'name' => $block_name,
            'title' => $block_data['title'],
            'category' => $block_data['category'] ?: 'custom',
            'icon' => $block_data['icon'] ? str_replace('dashicons-', '', $block_data['icon']) : 'screenoptions',
            'mode' => 'auto',
            'supports' => [
                'align' => false,
                'mode' => false,
                'multiple' => $block_data['multiple'] !== '' ? filter_var($block_data['multiple'], FILTER_VALIDATE_BOOLEAN) : true,
            ],
            'render_callback' => function($block, $content = '', $is_preview = false, $post_id = 0) use($block_file) {
                if($is_preview === true): ?>
                    <div class="first-block">
                        <span class="first-block-icon dashicons dashicons-<?= $block['icon'] ?>"></span>
                        <span class="first-block-title"><?= $block['title'] ?></span>
                        <span class="first-block-edit dashicons dashicons-edit"></span>
                    </div>
                <?php else:
                    require $block_file;
                endif;
            }
        ];

        acf_register_block_type($block_settings);
    }

    // Set allowed block types
    add_filter('allowed_block_types', function() use($allowed_blocks) {
        return $allowed_blocks;
    });

});


// Filter the allowed block categories; only allow 'reusable' && 'custom'

add_filter('block_categories', function($categories) {

    $allowed_categories = array_merge([
        [
            'slug' => 'custom',
            'title' => 'First-blokken',
            'icon' => ''
        ]
    ], $categories);

    return apply_filters('first_blocks_categories', $allowed_categories);

}, 99);


// Save custom excerpt on save_post

add_action('save_post', function($post_id, $post) {

    if(has_blocks($post)) {
        $parsed_blocks = parse_blocks($post->post_content);

        $rendered_blocks = array_reduce($parsed_blocks, function($prev_blocks, $current_block) {
            if(strpos($current_block['blockName'], 'acf/') !== false) { // ACF blocks
                return $prev_blocks . acf_rendered_block($current_block['attrs']);
            } elseif(strpos($current_block['blockName'], 'core/') !== false) { // Core blocks
                return $prev_blocks . render_block($current_block);
            } else { // Other block types are not supported
                return $prev_blocks . '';
            }
        });

        $dom = new DOMDocument();
        @$dom->loadHTML('<?xml encoding="utf-8" ?>' . $rendered_blocks);

        $p_tags = $dom->getElementsByTagName('p');
        if($p_tags) {
            $text = '';
            foreach($p_tags as $p_tag) $text .= ' ' . $p_tag->nodeValue;

            update_post_meta($post->ID, 'first_blocks_excerpt', $text);
        }
    }

}, 10, 2);


// Filters excerpt to add custom blocks

add_filter('get_the_excerpt', function($excerpt, $post) {

    if($excerpt) return $excerpt;

    if($first_blocks_excerpt = get_post_meta($post->ID, 'first_blocks_excerpt', true)) {
        $length = apply_filters('first_blocks_excerpt_length', apply_filters('excerpt_length', 55), $post);
        $more = apply_filters('first_blocks_excerpt_more', apply_filters('excerpt_more', '...'), $post);

        return wp_trim_words($first_blocks_excerpt, $length, $more);
    }

    return '';

}, 20, 2);


// Enqueue block editor assets

add_action('enqueue_block_editor_assets', function() {

    $src = FIRST_CORE_URL . '/assets/css/editor.css';
    $deps = [];
    $version = filemtime(FIRST_CORE_PATH . '/assets/css/editor.css');
    wp_enqueue_style('first-core-editor-style', $src, $deps, $version);

});