<?php
/**
 * Gutenberg blocks.
 *
 * @package KarmaDocs
 */

namespace KarmaDocs\Blocks;

use KarmaDocs\Frontend\Assets;
use KarmaDocs\Frontend\Shortcodes;

defined( 'ABSPATH' ) || exit;

/**
 * Dynamic blocks mirror the shortcodes; the callout block is static.
 */
class Blocks {

	/**
	 * Hooks.
	 */
	public function register() {
		add_action( 'init', array( $this, 'register_blocks' ) );
		add_filter( 'block_categories_all', array( $this, 'category' ) );
	}

	/**
	 * Adds the "Karma Docs" inserter category.
	 *
	 * @param array $categories Categories.
	 * @return array
	 */
	public function category( $categories ) {
		array_unshift(
			$categories,
			array(
				'slug'  => 'karma-docs',
				'title' => __( 'Karma Docs', 'karma-docs' ),
			)
		);
		return $categories;
	}

	/**
	 * Removes private notes from block content (search index, summaries,
	 * Markdown, embeds: everything that is not shown to an editor directly).
	 *
	 * @param string $content Block content.
	 * @return string
	 */
	public static function strip_private( $content ) {
		if ( false === strpos( (string) $content, 'wp:karma-docs/private-note' ) ) {
			return (string) $content;
		}
		$content = preg_replace( '#<!-- wp:karma-docs/private-note(?:\s[^>]*)? -->.*?<!-- /wp:karma-docs/private-note -->#s', '', (string) $content );
		return preg_replace( '#<!-- wp:karma-docs/private-note(?:\s[^>]*)? /-->#', '', $content );
	}

	/**
	 * Registers blocks.
	 */
	public function register_blocks() {
		$asset_file = KDOCS_PATH . 'build/blocks.asset.php';
		if ( ! file_exists( $asset_file ) ) {
			return;
		}
		$asset = require $asset_file;
		wp_register_script( 'kdocs-blocks', KDOCS_URL . 'build/blocks.js', $asset['dependencies'], $asset['version'], true );
		wp_set_script_translations( 'kdocs-blocks', 'karma-docs', KDOCS_PATH . 'languages' );
		wp_register_style( 'kdocs-blocks-editor', KDOCS_URL . 'build/frontend.css', array(), $asset['version'] );

		$common = array(
			'editor_script' => 'kdocs-blocks',
			'editor_style'  => 'kdocs-blocks-editor',
		);

		register_block_type(
			'karma-docs/docs',
			$common + array(
				'attributes'      => array(
					'search'  => array(
						'type'    => 'boolean',
						'default' => true,
					),
					'title'   => array(
						'type'    => 'string',
						'default' => '',
					),
					'columns' => array(
						'type'    => 'number',
						'default' => 3,
					),
				),
				'render_callback' => static function ( $attrs ) {
					return Shortcodes::docs(
						array(
							'search'  => ! empty( $attrs['search'] ) ? 'yes' : 'no',
							'title'   => isset( $attrs['title'] ) ? $attrs['title'] : '',
							'columns' => isset( $attrs['columns'] ) ? (int) $attrs['columns'] : 3,
						)
					);
				},
			)
		);

		register_block_type(
			'karma-docs/search',
			$common + array(
				'attributes'      => array(
					'kb'          => array(
						'type'    => 'number',
						'default' => 0,
					),
					'placeholder' => array(
						'type'    => 'string',
						'default' => '',
					),
					'size'        => array(
						'type'    => 'string',
						'default' => 'large',
					),
				),
				'render_callback' => static function ( $attrs ) {
					$args = array(
						'kb'   => isset( $attrs['kb'] ) ? (int) $attrs['kb'] : 0,
						'size' => isset( $attrs['size'] ) ? $attrs['size'] : 'large',
					);
					if ( ! empty( $attrs['placeholder'] ) ) {
						$args['placeholder'] = $attrs['placeholder'];
					}
					return Shortcodes::search( $args );
				},
			)
		);

		register_block_type(
			'karma-docs/kb',
			$common + array(
				'attributes'      => array(
					'kb'      => array(
						'type'    => 'number',
						'default' => 0,
					),
					'search'  => array(
						'type'    => 'boolean',
						'default' => false,
					),
					'columns' => array(
						'type'    => 'number',
						'default' => 3,
					),
				),
				'render_callback' => static function ( $attrs ) {
					return Shortcodes::kb(
						array(
							'id'      => isset( $attrs['kb'] ) ? (int) $attrs['kb'] : 0,
							'search'  => ! empty( $attrs['search'] ) ? 'yes' : 'no',
							'columns' => isset( $attrs['columns'] ) ? (int) $attrs['columns'] : 3,
						)
					);
				},
			)
		);

		$static_blocks = array(
			'karma-docs/callout',
			'karma-docs/faq',
			'karma-docs/faq-item',
			'karma-docs/tabs',
			'karma-docs/tab',
			'karma-docs/steps',
			'karma-docs/step',
			'karma-docs/code-group',
			'karma-docs/code-tab',
			'karma-docs/cards',
			'karma-docs/card',
			'karma-docs/accordion',
			'karma-docs/api-endpoint',
			'karma-docs/changelog',
		);

		// Notes for the team, shown only to people who can edit articles.
		register_block_type(
			'karma-docs/private-note',
			$common + array(
				'render_callback' => static function ( $attrs, $content ) {
					if ( ! current_user_can( 'edit_posts' ) ) {
						return '';
					}
					Assets::request();
					return '<aside class="kdocs-private-note" aria-label="' . esc_attr__( 'Private note', 'karma-docs' ) . '"><p class="kdocs-private-note-label">' . esc_html__( 'Private note · only editors see this', 'karma-docs' ) . '</p>' . $content . '</aside>';
				},
			)
		);

		// A section of another article, kept in sync with it.
		register_block_type(
			'karma-docs/section-embed',
			$common + array(
				'attributes'      => array(
					'article' => array(
						'type'    => 'number',
						'default' => 0,
					),
					'anchor'  => array(
						'type'    => 'string',
						'default' => '',
					),
				),
				'render_callback' => array( Media::class, 'section_embed' ),
			)
		);

		// Key points written by hand, shown like the AI summary card.
		register_block_type(
			'karma-docs/key-points',
			$common + array(
				'attributes'      => array(
					'title'  => array(
						'type'    => 'string',
						'default' => '',
					),
					'points' => array(
						'type'    => 'array',
						'items'   => array( 'type' => 'string' ),
						'default' => array(),
					),
				),
				'render_callback' => static function ( $attrs ) {
					$data = \KarmaDocs\Summary::validate( array( 'points' => $attrs['points'] ?? array() ) );
					if ( is_wp_error( $data ) ) {
						return '';
					}
					Assets::request();
					return \KarmaDocs\Summary::card( $data, array( 'title' => (string) ( $attrs['title'] ?? '' ) ) );
				},
			)
		);

		foreach ( $static_blocks as $block_name ) {
			register_block_type(
				$block_name,
				array(
					'editor_script'   => 'kdocs-blocks',
					'editor_style'    => 'kdocs-blocks-editor',
					'render_callback' => static function ( $attrs, $content ) {
						Assets::request();
						return $content;
					},
				)
			);
		}
	}
}