<?php
/**
 * General settings.
 *
 * @package Extrova
 */

declare( strict_types=1 );

namespace Extrova\Core;

defined( 'ABSPATH' ) || exit;

/**
 * Reads and writes `extrova_settings`.
 *
 * @since 1.0.0
 */
final class SettingsRepository {

	public const OPTION = 'extrova_settings';

	/**
	 * Memoised settings.
	 *
	 * @var array|null
	 */
	private ?array $settings = null;

	/**
	 * Settings merged with defaults. Unknown keys (e.g. from the Pro) are preserved.
	 */
	public function get(): array {
		if ( null === $this->settings ) {
			$stored         = get_option( self::OPTION, array() );
			$this->settings = self::merge( Schema::default_settings(), is_array( $stored ) ? $stored : array() );
		}
		return $this->settings;
	}

	/**
	 * Saves already-normalised settings.
	 *
	 * @param array $settings Settings.
	 */
	public function update( array $settings ): array {
		update_option( self::OPTION, $settings, false );
		$this->settings = null;
		return $this->get();
	}

	/**
	 * Whether the free shipping bar is enabled.
	 */
	public function bar_enabled(): bool {
		return ! empty( $this->get()['free_shipping_bar']['enabled'] );
	}

	/**
	 * Recursive merge where stored values win and missing keys take defaults.
	 *
	 * @param array $defaults Defaults.
	 * @param array $stored   Stored.
	 */
	public static function merge( array $defaults, array $stored ): array {
		foreach ( $defaults as $key => $value ) {
			if ( ! array_key_exists( $key, $stored ) ) {
				$stored[ $key ] = $value;
			} elseif ( is_array( $value ) && is_array( $stored[ $key ] ) && ! array_is_list( $value ) ) {
				$stored[ $key ] = self::merge( $value, $stored[ $key ] );
			}
		}
		return $stored;
	}
}