<?php
/**
 * Customized Styles Class
 *
 * @package    Modern
 * @copyright  WebMan Design, Oliver Juhas
 *
 * @since    2.0.0
 * @version  2.4.3
 *
 * Contents:
 *
 *   0) Init
 *  10) CSS output
 *  20) Enqueue
 * 100) Helpers
 */
class Modern_Customize_Styles {


	/**
	 * 0) Init
	 */

		/**
		 * Initialization.
		 *
		 * @since    2.0.0
		 * @version  2.3.0
		 */
		public static function init() {

			// Processing

				// Hooks

					// Actions

						add_action( 'wp_enqueue_scripts', __CLASS__ . '::inline_styles', 110 );

						add_action( 'wp_ajax_modern_editor_styles',         __CLASS__ . '::get_editor_css_variables' );
						add_action( 'wp_ajax_no_priv_modern_editor_styles', __CLASS__ . '::get_editor_css_variables' );

						add_action( 'customize_save_after', __CLASS__ . '::customize_timestamp' );

					// Filters

						add_filter( 'wmhook_modern_assets_editor', __CLASS__ . '::editor_stylesheet' );

						add_filter( 'wmhook_modern_esc_css', 'wp_strip_all_tags' );

		} // /init


	/**
	 * 10) CSS output
	 */

		/**
		 * Get custom CSS.
		 *
		 * @since    2.0.0
		 * @version  2.4.3
		 */
		public static function get_css() {

			// Variables

				$output = '';


			// Processing

				if ( $background_color = maybe_hash_hex_color( get_background_color() ) ) {
					$output .=
						':root {' .
						'--background_color:' . esc_attr( $background_color ) . ';' .
						'--background_color--a0:' . esc_attr( Modern_Customize::color_hex_to_rgba( $background_color, 0 ) ) . ';' .
						'}';
				}


			// Output

				return (string) apply_filters( 'wmhook_modern_customize_styles_get_css', $output );

		} // /get_css


		/**
		 * Get processed CSS variables string.
		 *
		 * @since    2.3.0
		 * @version  2.3.0
		 */
		public static function get_css_variables() {

			// Variables

				$css_vars = '';


			// Processing

				if ( is_callable( 'Modern_Library_CSS_Variables::get_variables_string' ) ) {
					$css_vars = Modern_Library_CSS_Variables::get_variables_string();
				}

				if ( ! empty( $css_vars ) ) {
					$css_vars =
						'/* START CSS variables */'
						. PHP_EOL
						. ':root { '
						. PHP_EOL
						. $css_vars
						. PHP_EOL
						. '}'
						. PHP_EOL
						. '/* END CSS variables */';
				}


			// Output

				return (string) $css_vars;

		} // /get_css_variables


	/**
	 * 20) Enqueue
	 */

		/**
		 * Enqueue HTML head inline styles.
		 *
		 * @since    2.0.0
		 * @version  2.3.0
		 */
		public static function inline_styles() {

			// Variables

				$css  = (string) self::get_css_variables();
				$css .= (string) self::get_css();


			// Processing

				if ( ! empty( $css ) ) {
					wp_add_inline_style(
						'modern',
						(string) self::esc_css( $css, 'customize-styles' )
					);
				}

		} // /inline_styles


		/**
		 * Enqueue custom styles into Content editor using Ajax.
		 *
		 * @since    2.0.0
		 * @version  2.3.0
		 *
		 * @param  array $visual_editor_stylesheets
		 */
		public static function editor_stylesheet( $visual_editor_stylesheets = array() ) {

			// Processing

				/**
				 * @see  `stargazer_get_editor_styles` https://github.com/justintadlock/stargazer/blob/master/inc/stargazer.php
				 */
				$visual_editor_stylesheets[90] = esc_url_raw( add_query_arg(
					array(
						'action' => 'modern_editor_styles',
						'ver'    => MODERN_THEME_VERSION . '.' . get_theme_mod( '__customize_timestamp' ),
					),
					admin_url( 'admin-ajax.php' )
				) );


			// Output

				return $visual_editor_stylesheets;

		} // /editor_stylesheet


		/**
		 * Ajax callback for outputting custom styles for Visual editor.
		 *
		 * @see  https://github.com/justintadlock/stargazer/blob/master/inc/custom-colors.php
		 *
		 * @since    2.3.0
		 * @version  2.3.0
		 */
		public static function get_editor_css_variables() {

			// Variables

				$css_vars = self::get_css_variables();


			// Processing

				if ( ! empty( $css_vars ) ) {
					header( 'Content-type: text/css' );
					echo (string) self::esc_css( $css_vars, 'customize-styles-editor' );
				}

				die();

		} // /get_editor_css_variables


	/**
	 * 100) Helpers
	 */

		/**
		 * Customizer save timestamp.
		 *
		 * @subpackage  Customize Options
		 *
		 * @since    2.3.0
		 * @version  2.3.0
		 */
		public static function customize_timestamp() {

			// Output

				set_theme_mod( '__customize_timestamp', esc_attr( gmdate( 'ymdHis' ) ) );

		} // /customize_timestamp


		/**
		 * Escape CSS code.
		 *
		 * @since    2.3.0
		 * @version  2.3.0
		 *
		 * @param  string $css
		 * @param  string $scope  Optional CSS code identification for better filtering.
		 */
		public static function esc_css( $css = '', $scope = '' ) {

			// Output

				return (string) apply_filters( 'wmhook_modern_esc_css', $css, $scope );

		} // /esc_css


} // /Modern_Customize_Styles

add_action( 'after_setup_theme', 'Modern_Customize_Styles::init' );