<?php

namespace WooOrderCart\Config;

/**
 * Shared icon registry + normalization for My Account menu items.
 */
class CartIconRegistry
{
	/**
	 * Small curated dashicons set for admin selection.
	 *
	 * @var array<int,array{value:string,label:string}>
	 */
	private const DASHICON_OPTIONS = [
		['value' => '...'],

	];

	/**
	 * Legacy FA values to keep existing setups compatible.
	 *
	 * @var array<int,array{value:string,label:string}>
	 */
	private const FA_LEGACY_OPTIONS = [
		['value' => 'fa fa-'],

	];

	/**
	 * @return array<int,array{value:string,label:string}>
	 */
	public static function get_options_for_react(): array
	{
		$options = array_merge(self::DASHICON_OPTIONS, self::FA_LEGACY_OPTIONS);
		/**
		 * Filter icon options passed to React admin.
		 *
		 * @param array<int,array{value:string,label:string}> $options
		 */
		return apply_filters('ipscmi_order_cart_icon_options', $options);
	}

	/**
	 * Normalize raw icon values to a stable class format.
	 *
	 * - dashicons: "dashicons dashicons-foo"
	 * - font awesome: "fa fa-bar" (or existing fa style family)
	 *
	 * @param mixed $raw
	 */
	public static function normalize_icon_class($raw): string
	{
		if (is_array($raw)) {
			$raw = '';
		}

		$raw = trim(sanitize_text_field((string) $raw));
		if ('' === $raw) {
			return '';
		}

		$tokens = preg_split('/\s+/', $raw);
		if (! is_array($tokens)) {
			$tokens = [];
		}
		$tokens = array_values(
			array_filter(
				array_map(
					static function ($token) {
						return is_string($token) ? trim($token) : '';
					},
					$tokens
				)
			)
		);

		$dashicon = self::extract_dashicons_slug($tokens, $raw);
		if ('' !== $dashicon) {
			return 'dashicons ' . $dashicon;
		}

		$fa_icon = self::extract_fa_icon($tokens, $raw);
		if ('' !== $fa_icon) {
			$style = self::extract_fa_style($tokens);
			return trim($style . ' ' . $fa_icon);
		}

		$safe = [];
		foreach ($tokens as $token) {
			$token = sanitize_html_class($token);
			if ('' !== $token) {
				$safe[$token] = true;
			}
		}

		return implode(' ', array_keys($safe));
	}

	/**
	 * @param array<int,string> $tokens
	 */
	private static function extract_dashicons_slug(array $tokens, string $raw): string
	{
		foreach ($tokens as $token) {
			if (0 === strpos($token, 'dashicons-')) {
				return sanitize_html_class($token);
			}
		}

		if (0 === strpos($raw, 'dashicons-')) {
			return sanitize_html_class($raw);
		}

		return '';
	}

	/**
	 * @param array<int,string> $tokens
	 */
	private static function extract_fa_icon(array $tokens, string $raw): string
	{
		foreach ($tokens as $token) {
			if (0 === strpos($token, 'fa-')) {
				return sanitize_html_class(strtolower($token));
			}
		}

		if (preg_match('/^fa-[a-z0-9-]+$/i', $raw)) {
			return sanitize_html_class(strtolower($raw));
		}

		if (preg_match('/^[a-z0-9-]+$/i', $raw)) {
			return sanitize_html_class('fa-' . strtolower($raw));
		}

		return '';
	}

	/**
	 * @param array<int,string> $tokens
	 */
	private static function extract_fa_style(array $tokens): string
	{
		$styles = ['fa', 'fas', 'far', 'fab', 'fal', 'fad', 'fa-solid', 'fa-regular', 'fa-brands'];
		foreach ($tokens as $token) {
			if (in_array($token, $styles, true)) {
				return $token;
			}
		}

		return 'fa';
	}
}