<?php
if (!defined('ABSPATH')) die('No direct access.');

/**
 * Adds a MetaSlider block to Gutenberg
 */
class MetaSlider_Gutenberg { 

	/**
	 * Init
	 */
	public function __construct() {
		add_action('enqueue_block_editor_assets', array($this,'enqueue_block_scripts'));
		if (isset($_REQUEST['override_preview_style']) && filter_var($_REQUEST['override_preview_style'], FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)) {
			add_filter('metaslider_preview_styles', array($this, 'preview_styles'));
		}
	}

	/**
	 * Enqueues gutenberg scripts
	 */
	public function enqueue_block_scripts() {
		$version = MetaSliderPlugin::get_instance()->version;

		// Enqueue the bundled block JS file
		wp_enqueue_script(
			'metaslider-blocks',
			plugins_url('assets/js/editor-block-' . sanitize_title(METASLIDER_VERSION) . '.js', __FILE__),
			array('wp-i18n', 'wp-element', 'wp-block-library', 'wp-components', 'wp-api'),
			$version
		);
		
		wp_localize_script('metaslider-blocks', 'metaslider_block_config', array(
			'preview_url' => add_query_arg('ms_gutenberg_preview', 1, set_url_scheme(home_url())),
			'plugin_page' => admin_url('admin.php?page=metaslider')
		));

		/*
		 * gutenberg_get_jed_locale_data uses WP function get_translations_for_domain, 
		 * which can be usefull if we want to use wp.18n.__ in the rest of the plugin.
		 */
		$locale_data = $this->gutenberg_get_jed_locale_data('ml-slider');
		wp_add_inline_script(
			'metaslider-blocks',
			'wp.i18n.setLocaleData(' . json_encode($locale_data) . ', \'ml-slider\');',
			'before'
		);
	
		// Enqueue optional editor only styles
		wp_enqueue_style(
			'metaslider-blocks-editor-css',
			plugins_url('assets/css/gutenberg/editor-block-' . sanitize_title(METASLIDER_VERSION) . '.css', __FILE__),
			array('wp-block-library'),
			$version
		);
		
	}

	/**
	 * Preview styles
	 * 
	 * @param string $styles The preview styles
	 * @return string
	 */
	public function preview_styles($styles) {
		ob_start();
		?>
		body, html {
			overflow: hidden;
			height: auto;
			margin:0;
			padding:0;
			box-sizing: border-box;
			font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif; 
			font-size: 14px;
		}
		.metaslider {
			margin: 0 auto;
		}
		<?php
		return ob_get_clean();
	}

	/**
	 * Backup function for Gutenberg's gutenberg_get_jed_locale_data
	 * 
	 * @param string $domain - The text domain for the strings
	 */
	private function gutenberg_get_jed_locale_data($domain) {

		if (function_exists('gutenberg_get_jed_locale_data')) {
			return gutenberg_get_jed_locale_data($domain);
		}
		
		$translations = get_translations_for_domain($domain);
		$locale = array(
			'' => array(
				'domain' => $domain,
				'lang' => is_admin() && function_exists('get_user_locale') ? get_user_locale() : get_locale(),
			),
		);

		if (!empty($translations->headers['Plural-Forms'])) {
			$locale['']['plural_forms'] = $translations->headers['Plural-Forms'];
		}

		foreach ($translations->entries as $msgid => $entry) {
			$locale[$msgid] = $entry->translations;
		}
		return $locale;
	}
}