<?php
/**
 * Condition row stored on an automation (docs/20 §4).
 *
 * @package Bookline
 */

declare( strict_types=1 );

namespace Bookline\Domain\Automation;

use Bookline\Domain\Shared\DomainException;

/**
 * Immutable condition definition.
 *
 * @since 0.1.0
 */
final class ConditionDefinition {

	/**
	 * Constructor.
	 *
	 * @param string               $identifier Condition identifier.
	 * @param array<string, mixed> $config     Config.
	 *
	 * @throws DomainException When identifier is empty.
	 */
	public function __construct(
		private readonly string $identifier,
		private readonly array $config = [],
	) {
		if ( '' === trim( $this->identifier ) ) {
			throw new DomainException( 'automation.condition_empty', 'Condition identifier must not be empty.' );
		}
	}

	/**
	 * Identifier.
	 *
	 * @since 0.1.0
	 */
	public function identifier(): string {
		return $this->identifier;
	}

	/**
	 * Config.
	 *
	 * @return array<string, mixed>
	 *
	 * @since 0.1.0
	 */
	public function config(): array {
		return $this->config;
	}

	/**
	 * Serialise.
	 *
	 * @return array<string, mixed>
	 *
	 * @since 0.1.0
	 */
	public function to_array(): array {
		return [
			'identifier' => $this->identifier,
			'config'     => $this->config,
		];
	}

	/**
	 * Hydrate.
	 *
	 * @param array<string, mixed> $data Data.
	 *
	 * @since 0.1.0
	 */
	public static function from_array( array $data ): self {
		$config = isset( $data['config'] ) && is_array( $data['config'] ) ? $data['config'] : [];
		return new self( (string) ( $data['identifier'] ?? '' ), $config );
	}
}