import { prisma } from '@/lib/prisma'

export type TaskMaterialCompletionState =
  | { state: 'completed'; taskStatus: 'completed'; previewUrl: string; zipFilePath: string }
  | { state: 'completed_incomplete'; taskStatus: 'completed'; previewUrl: string; zipFilePath: string }
  | { state: 'processing'; taskStatus: 'processing' }
  | { state: 'other'; taskStatus: string | null | undefined }
  | { state: 'unknown'; error: unknown }

/**
 * 完成接口遇到数据库异常时，不能凭本地布尔值判断事务是否提交。
 * 只有再次确认仍是 processing，调用方才可以删除本请求产物；查询失败时必须
 * 保留全部文件，交给重试/人工核查，避免“记录 completed、文件却被回滚”。
 */
export async function inspectTaskMaterialCompletionAfterError(
  materialId: string,
): Promise<TaskMaterialCompletionState> {
  try {
    const material = await prisma.material.findUnique({
      where: { id: materialId },
      select: {
        taskStatus: true,
        previewUrl: true,
        zipFilePath: true,
        assets: {
          where: { assetType: { in: ['preview', 'zip'] } },
          select: { assetType: true },
        },
      },
    })
    if (material?.taskStatus === 'completed') {
      const previewUrl = String(material.previewUrl || '').trim()
      const zipFilePath = String(material.zipFilePath || '').trim()
      const assetTypes = new Set(material.assets.map((asset) => asset.assetType))
      if (previewUrl && zipFilePath && assetTypes.has('preview') && assetTypes.has('zip')) {
        return { state: 'completed', taskStatus: 'completed', previewUrl, zipFilePath }
      }
      return { state: 'completed_incomplete', taskStatus: 'completed', previewUrl, zipFilePath }
    }
    if (material?.taskStatus === 'processing') {
      return { state: 'processing', taskStatus: 'processing' }
    }
    return { state: 'other', taskStatus: material?.taskStatus }
  } catch (error) {
    return { state: 'unknown', error }
  }
}