<?php

declare(strict_types=1);

namespace app\common\service\pharmacy;

use DomainException;

final class EjMedicineMappingPolicy
{
    /** @param array<string,mixed> $local @param array<string,mixed> $remote */
    public static function assertValid(array $local, array $remote): void
    {
        if ((int) ($local['id'] ?? 0) <= 0) {
            throw new DomainException('本地药材不存在');
        }
        if (!empty($local['delete_time'])) {
            throw new DomainException('本地药材已删除，不能建立映射');
        }
        if ((int) ($local['status'] ?? 0) !== 1) {
            throw new DomainException('本地药材已停用，不能建立映射');
        }

        if (trim((string) ($remote['medicine_code'] ?? '')) === '') {
            throw new DomainException('洛阳药房药材不存在');
        }
        if (!empty($remote['remote_deleted'])) {
            throw new DomainException('洛阳药房药材已删除，不能建立映射');
        }
        if ((int) ($remote['status'] ?? 0) !== 1) {
            throw new DomainException('洛阳药房药材已停用，不能建立映射');
        }
    }

    /**
     * @param array<string,mixed> $local
     * @param array<string,mixed>|null $mapping
     * @return array{mapping_id:int,already_unlinked:bool}
     */
    public static function unlinkDecision(array $local, ?array $mapping): array
    {
        $localId = (int) ($local['id'] ?? 0);
        if ($localId <= 0) {
            throw new DomainException('本地药材不存在');
        }
        if ($mapping === null) {
            return ['mapping_id' => 0, 'already_unlinked' => true];
        }
        if ((int) ($mapping['local_medicine_id'] ?? 0) !== $localId) {
            throw new DomainException('药材映射归属不匹配');
        }

        $mappingId = (int) ($mapping['id'] ?? 0);
        if ($mappingId <= 0) {
            throw new DomainException('药材映射记录无效');
        }
        return [
            'mapping_id' => $mappingId,
            'already_unlinked' => (int) ($mapping['status'] ?? 0) !== 1 || !empty($mapping['delete_time']),
        ];
    }
}