<?php
/**
 * Plugin Name:  Code Syntax Block
 * Plugin URI:   https://github.com/mkaz/code-syntax-block
 * Description:  A plugin to extend Gutenberg code block with syntax highlighting
 * Version:      3.2.1
 * Author:       Marcus Kazmierczak
 * Author URI:   https://mkaz.blog/
 * License:      GPL2
 * License URI:  https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain:  code-syntax-block
 *
 * @package Code_Syntax_Block
 */

// version added, used in URL
const MKAZ_CODE_SYNTAX_BLOCK_VERSION = '3.2.1';
const MKAZ_CODE_SYNTAX_DEFAULT_SCHEME = 'prism-a11y-dark';
const MKAZ_CODE_SYNTAX_COLOR_SCHEMES = array(
	'prism-a11y-dark' => 'A11y Dark',
	'prism-ghcolors' => 'GitHub (Light)',
	'prism-nord' => 'Nord',
	'prism-onedark' => 'One Dark'
);

require dirname( __FILE__ ) . '/prism-languages.php';
require dirname( __FILE__ ) . '/settings.php';

/**
 * Enqueue assets for editor portion of Gutenberg
 */
add_action( 'enqueue_block_editor_assets', function() {
	$asset_file = include( plugin_dir_path( __FILE__ ) . 'build/index.asset.php' );
	$editor_style_path = 'assets/blocks.editor.css';

	// Prism Languages - write out as JavaScript array that makes
	// it available to show in the editor
	$languages = mkaz_code_syntax_block_get_supported_languages();

	// Block.
	wp_enqueue_script(
		'mkaz-code-syntax',
		plugins_url( 'build/index.js', __FILE__ ),
		$asset_file['dependencies'],
		$asset_file['version']
	);

	// Enqueue view style.
	wp_enqueue_style(
		'mkaz-code-syntax-editor-css',
		plugins_url( $editor_style_path, __FILE__ ),
		[],
		filemtime( plugin_dir_path( __FILE__ ) . $editor_style_path )
	);

	$default_lang = get_option( 'mkaz-code-syntax-default-lang', '' );
	wp_add_inline_script(
		'mkaz-code-syntax',
		implode(
			"\n",
			array(
				'const mkaz_code_syntax_languages = ' . json_encode( $languages ) . ';',
				'const mkaz_code_syntax_default_lang = ' . json_encode( $default_lang ) . ';',
			)
		),
		'before'
	);

} );

/**
 * Enqueue assets for frontend, not editor.
 */
add_action( 'wp_enqueue_scripts', function() {

	global $posts;
	/**
	 * Filter forces loading assets even if no block detected.
	 *
	 * @since 1.2.4
	 *
	 */
	$force_load = apply_filters( 'mkaz_code_syntax_force_loading', false );
	// if not forcing the loading of assets check if the block
	// is found and if no block skip loading assets
	if ( ! $force_load ) {
		if ( empty( $posts ) ) {
			return;
		}

		$found_block = array_reduce( $posts, function($found, $post) {
			return $found || has_block( 'code', $post );
		}, false );

		if ( ! $found_block ) {
			return;
		}
	}

	// Files.
	$prism_js_path   = 'assets/prism/prism.js';
	$prism_settings_path = 'assets/prism/prism-settings.js';

	// Enqueue prism style.
	wp_enqueue_style(
		'mkaz-code-syntax-prism-css',
		mkaz_prism_theme_css(),
		[],
		mkaz_prism_theme_css_ver()
	);

	// Enqueue prism script.
	wp_enqueue_script(
		'mkaz-code-syntax-prism-js',
		plugins_url( $prism_js_path, __FILE__ ),
		[], // No dependencies.
		filemtime( plugin_dir_path( __FILE__ ) . $prism_js_path ),
		true // In footer.
	);

	// save the plugin path
	wp_localize_script('mkaz-code-syntax-prism-js', 'prism_settings', array(
		'pluginUrl' => plugin_dir_url(__FILE__),
	));
} );

/**
 * Locate a given resource URL in the active theme or with the default.
 *
 * @param boolean $rtnPath True returns path, default false returns URL
 */
function mkaz_prism_theme_css( $rtnPath = false ) {

	$default_path = '/assets/prism-a11y-dark.css';

	/**
	 * Site option overrides theme, because the site option can be set by the user.
	 * However, we will want the theme to be able to override the default.
	 * @since 2.0.0
	 */
	$option = get_option( 'mkaz-code-syntax-color-scheme', 'prism-a11y-dark' );

	// confirm file exists
	if ( $option ) {
		$option_rel_path  = '/assets/' . $option . '.css';
		$option_file_path = plugin_dir_path( __FILE__ ) . $option_rel_path;
		if ( file_exists( $option_file_path ) ) {
			$default_path = $option_rel_path;
		}
	}

	/**
	 * Filter the theme directory path used for overriding css path
	 *
	 * @fix 2.0.3 - Hardcode value to assets/prism/prism.css instead of default
	 * In 2.0.0 the default path was changed to a11y and support site option,
	 * but previous themes and docs instruct to look for this path.
	 *
	 * @since 0.8.2
	 *
	 * @param string $path Path to the file to override, relative to the theme
	 */
	$css_rel_path = apply_filters( 'mkaz_prism_css_path', "/assets/prism/prism.css" );
	$theme_file_path = get_stylesheet_directory() . $css_rel_path;

	if ( file_exists( $theme_file_path ) ) {
		$prism_css_path = $theme_file_path;
		$prism_css_url = get_stylesheet_directory_uri() . $css_rel_path;
	}
	else {
		$prism_css_path = plugin_dir_path( __FILE__ ) . $default_path;
		$prism_css_url = plugins_url( $default_path, __FILE__ );
	}

	if ( $rtnPath ) {
		return $prism_css_path;
	}

	/**
	 * Filter the URL of the Syntax Highlighting colors.
	 * Use this filter to define your own color set.
	 *
	 * @since 0.8.1
	 *
	 * @param string $prism_css_url Absolute URL of the default CSS file you want to enqueue.
	 */
	return apply_filters( 'mkaz_prism_css_url', $prism_css_url );
}

/**
 * Return version or timestamp for theme_css to be used in enqueue version,
 * otherwise plugin version used for cache busting CSS enqueue.
 *
 * @return string
 *
 */
function mkaz_prism_theme_css_ver() {
	// Check if full url is being used, if so return version.
	$prism_css_url = apply_filters( 'mkaz_prism_css_url', false );
	if ( $prism_css_url ) {
		return MKAZ_CODE_SYNTAX_BLOCK_VERSION;
	}

	$css_path = mkaz_prism_theme_css( true );
	if ( file_exists( $css_path ) ) {
		return filemtime( $css_path );
	}
	return MKAZ_CODE_SYNTAX_BLOCK_VERSION;
}

// extend code tag to allow lang attribute
add_filter( 'wp_kses_allowed_html', function( $tags ) {

	if ( isset( $tags['code'] ) && is_array( $tags['code'] ) ) {
		$tags['code']['lang'] = array();
	} else {
		$tags['code'] = array(
			'lang' => array(),
		);
	}
    return $tags;
}, 10, 2);