<?php
declare(strict_types=1);

namespace Unsupervised\Schedular\Policy;

/**
 * Orchestrates policy operations that span the policies and versions tables.
 */
class PolicyService {

	public function __construct(
		private PolicyRepository $policies,
		private PolicyVersionRepository $versions,
	) {}

	public function createPolicy( string $title, string $slug, string $scope = Policy::SCOPE_BOOKING ): int {
		return $this->policies->insert( new Policy( $title, $slug, acceptanceScope: $scope ) );
	}

	/**
	 * Add a new draft version to a policy, numbered after the latest existing one.
	 */
	public function addDraftVersion( int $policyId, ?string $body ): int {
		$next = $this->versions->maxVersionNumber( $policyId ) + 1;

		return $this->versions->insert(
			new PolicyVersion(
				policyId:      $policyId,
				versionNumber: $next,
				body:          $body,
				status:        PolicyVersion::STATUS_DRAFT,
			)
		);
	}

	/**
	 * Publish a version: archive the policy's previously current version, mark
	 * the new one published, and point the policy at it. Returns false if the
	 * version does not belong to the policy.
	 */
	public function publishVersion( int $policyId, int $versionId ): bool {
		$policy  = $this->policies->findById( $policyId );
		$version = $this->versions->findById( $versionId );

		if ( null === $policy || null === $version || $version->policyId !== $policyId ) {
			return false;
		}

		if ( null !== $policy->currentVersionId && $policy->currentVersionId !== $versionId ) {
			$this->versions->updateStatus( $policy->currentVersionId, PolicyVersion::STATUS_ARCHIVED );
		}

		$this->versions->updateStatus( $versionId, PolicyVersion::STATUS_PUBLISHED, current_time( 'mysql' ) );
		$this->policies->updateCurrentVersion( $policyId, $versionId );

		return true;
	}
}