<?php
/**
 * Read-only access to the active theme's colour palette.
 *
 * @package A11yMate
 */

namespace A11yMate\Support;

defined( 'ABSPATH' ) || exit;

/**
 * The editor assistant uses this to resolve palette slugs to colours.
 */
class ThemePalette {

	/**
	 * The active palette as a flat list of slug, name, color.
	 *
	 * @return array
	 */
	public static function colours() {
		$out = array();
		if ( function_exists( 'wp_get_global_settings' ) && function_exists( 'wp_is_block_theme' ) ) {
			$p = wp_get_global_settings( array( 'color', 'palette' ) );
			if ( is_array( $p ) ) {
				$lists = isset( $p['theme'] ) || isset( $p['default'] ) || isset( $p['custom'] ) ? array( 'theme', 'custom', 'default' ) : array( null );
				foreach ( $lists as $origin ) {
					$list = null === $origin ? $p : ( isset( $p[ $origin ] ) ? $p[ $origin ] : array() );
					foreach ( (array) $list as $c ) {
						if ( ! is_array( $c ) || empty( $c['color'] ) ) {
							continue;
						}
						$out[] = array(
							'slug'   => isset( $c['slug'] ) ? $c['slug'] : '',
							'name'   => isset( $c['name'] ) ? $c['name'] : '',
							'color'  => $c['color'],
							'origin' => null === $origin ? 'theme' : $origin,
						);
					}
				}
			}
		}
		if ( ! $out ) {
			$support = get_theme_support( 'editor-color-palette' );
			if ( is_array( $support ) && ! empty( $support[0] ) ) {
				foreach ( $support[0] as $c ) {
					$out[] = array(
						'slug'   => isset( $c['slug'] ) ? $c['slug'] : '',
						'name'   => isset( $c['name'] ) ? $c['name'] : '',
						'color'  => isset( $c['color'] ) ? $c['color'] : '',
						'origin' => 'theme',
					);
				}
			}
		}
		// Only plain hex colours can be compared reliably.
		return array_values(
			array_filter(
				$out,
				static function ( $c ) {
					return (bool) preg_match( '/^#([0-9a-f]{3}|[0-9a-f]{6})$/i', $c['color'] );
				}
			)
		);
	}
}