<?php
/**
 * Stores configuration for WooCommerce SEO module.
 *
 * @package Airygen\Modules\WooCommerceSeo\Admin
 */

declare(strict_types=1);

namespace Airygen\Modules\WooCommerceSeo\Admin;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

use Airygen\Constants;

/**
 * Persists WooCommerce SEO settings.
 */
final class Settings {

	private const OPTION = Constants::OPTION_WOOCOMMERCE_SEO;

	/**
	 * Ensure option exists.
	 *
	 * @return void
	 */
	public static function ensure_exists(): void {
		if ( false === get_option( self::OPTION, false ) ) {
			add_option( self::OPTION, self::default_config(), '', 'no' );
			return;
		}

		self::update( (array) get_option( self::OPTION, array() ) );
	}

	/**
	 * Get sanitized settings.
	 *
	 * @return array<string, mixed>
	 */
	public static function get(): array {
		return self::sanitize( get_option( self::OPTION, array() ) );
	}

	/**
	 * Save sanitized settings.
	 *
	 * @param array<string, mixed> $value Incoming value.
	 *
	 * @return void
	 */
	public static function update( array $value ): void {
		update_option( self::OPTION, self::sanitize( $value ), 'no' );
	}

	/**
	 * Sanitize value.
	 *
	 * @param mixed $value Raw value.
	 *
	 * @return array<string, mixed>
	 */
	private static function sanitize( $value ): array {
		$config = self::default_config();

		if ( ! is_array( $value ) ) {
			return $config;
		}

		if ( array_key_exists( 'enabled', $value ) ) {
			$config['enabled'] = (bool) $value['enabled'];
		}

		if ( isset( $value['brand_attribute'] ) && is_string( $value['brand_attribute'] ) ) {
			$brand = sanitize_key( $value['brand_attribute'] );
			if ( '' !== $brand ) {
				$config['brand_attribute'] = $brand;
			}
		}

		if ( isset( $value['templates'] ) && is_array( $value['templates'] ) ) {
			if ( isset( $value['templates']['product'] ) && is_array( $value['templates']['product'] ) ) {
				$config['templates']['product'] = self::sanitize_template_group(
					$value['templates']['product'],
					$config['templates']['product']
				);
			}

			if ( isset( $value['templates']['separator'] ) && is_string( $value['templates']['separator'] ) ) {
				$separator = trim( sanitize_text_field( $value['templates']['separator'] ) );
				if ( '' !== $separator ) {
					$config['templates']['separator'] = mb_substr( $separator, 0, 10 );
				}
			}

			if ( isset( $value['templates']['custom_tokens'] ) && is_array( $value['templates']['custom_tokens'] ) ) {
				$config['templates']['custom_tokens'] = self::sanitize_custom_tokens(
					$value['templates']['custom_tokens'],
					$config['templates']['custom_tokens']
				);
			}
		}

		return $config;
	}

	/**
	 * Default settings.
	 *
	 * @return array<string, mixed>
	 */
	private static function default_config(): array {
		return array(
			'enabled'         => true,
			'brand_attribute' => 'product_brand',
			'templates'       => array(
				'product'       => array(
					'title'       => '%product_name% %separator% %site_name%',
					'description' => '%product_name% in %category_name%. SKU: %sku%.',
				),
				'separator'     => '–',
				'custom_tokens' => array(
					'custom_1' => '',
					'custom_2' => '',
					'custom_3' => '',
				),
			),
		);
	}

	/**
	 * Sanitize template group.
	 *
	 * @param array<string, mixed>  $group    Group values.
	 * @param array<string, string> $fallback Fallback values.
	 *
	 * @return array<string, string>
	 */
	private static function sanitize_template_group( array $group, array $fallback ): array {
		$title       = isset( $group['title'] ) && is_string( $group['title'] ) ? $group['title'] : $fallback['title'];
		$description = isset( $group['description'] ) && is_string( $group['description'] ) ? $group['description'] : $fallback['description'];

		return array(
			'title'       => mb_substr( trim( wp_strip_all_tags( $title ) ), 0, 180 ),
			'description' => mb_substr( trim( wp_strip_all_tags( $description ) ), 0, 220 ),
		);
	}

	/**
	 * Sanitize custom tokens.
	 *
	 * @param array<string, mixed>  $tokens   Token values.
	 * @param array<string, string> $fallback Fallback tokens.
	 *
	 * @return array<string, string>
	 */
	private static function sanitize_custom_tokens( array $tokens, array $fallback ): array {
		$custom_1 = isset( $tokens['custom_1'] ) && is_string( $tokens['custom_1'] ) ? $tokens['custom_1'] : $fallback['custom_1'];
		$custom_2 = isset( $tokens['custom_2'] ) && is_string( $tokens['custom_2'] ) ? $tokens['custom_2'] : $fallback['custom_2'];
		$custom_3 = isset( $tokens['custom_3'] ) && is_string( $tokens['custom_3'] ) ? $tokens['custom_3'] : $fallback['custom_3'];

		return array(
			'custom_1' => mb_substr( sanitize_text_field( $custom_1 ), 0, 160 ),
			'custom_2' => mb_substr( sanitize_text_field( $custom_2 ), 0, 160 ),
			'custom_3' => mb_substr( sanitize_text_field( $custom_3 ), 0, 160 ),
		);
	}
}