/** @jest-environment node */

import {
  mkdir,
  mkdtemp,
  readFile,
  rm,
  stat,
  writeFile,
} from 'fs/promises'
import os from 'os'
import path from 'path'

import {
  beginUploadCompletionSeal,
  completeUploadCompletionSeal,
  readUploadSessionSeal,
} from '@/lib/material-upload-session-seal'
import {
  cleanupConsumedUploadSession,
  safelyCleanupMaterialUploadSession,
} from '@/lib/temp-cleanup'
import { uploadSessions, type UploadSession } from '@/lib/upload-sessions'

describe('safe material upload cleanup protocol', () => {
  let uploadRoot: string
  const uploadId = 'safe-cleanup-upload-1'

  beforeEach(async () => {
    uploadRoot = await mkdtemp(path.join(os.tmpdir(), 'material-safe-cleanup-'))
    process.env.UPLOAD_DIR = uploadRoot
    process.env.USE_REDIS = 'false'
    uploadSessions.clear()
  })

  afterEach(async () => {
    uploadSessions.clear()
    delete process.env.UPLOAD_DIR
    delete process.env.USE_REDIS
    await rm(uploadRoot, { recursive: true, force: true })
  })

  test('completed + valid merged is never deleted by public cancellation', async () => {
    const { tempDir, mergedPath } = await createUploadDirectory(uploadId)
    seedMemorySession(uploadId)
    const seal = await beginUploadCompletionSeal(uploadId)
    expect(seal.state).toBe('sealing')
    if (seal.state !== 'sealing') throw new Error('missing seal handle')
    await completeUploadCompletionSeal(seal.handle)

    const result = await safelyCleanupMaterialUploadSession({
      uploadId,
      intent: 'cancel',
      expectedOwnerId: 'user-1',
    })

    expect(result).toMatchObject({
      success: false,
      status: 'protected_completed',
      code: 'UPLOAD_SESSION_COMPLETED',
      httpStatus: 409,
    })
    await expect(readFile(mergedPath, 'utf8')).resolves.toBe('data')
    await expect(stat(tempDir)).resolves.toMatchObject({})
    expect(uploadSessions.has(uploadId)).toBe(true)
  })

  test('sealing + valid merged is retained by public and scheduled cleanup', async () => {
    const { mergedPath } = await createUploadDirectory(uploadId)
    seedMemorySession(uploadId)
    await beginUploadCompletionSeal(uploadId)

    const result = await safelyCleanupMaterialUploadSession({
      uploadId,
      intent: 'cancel',
      expectedOwnerId: 'user-1',
    })

    expect(result.status).toBe('protected_sealing')
    await expect(readFile(mergedPath, 'utf8')).resolves.toBe('data')
    expect(uploadSessions.has(uploadId)).toBe(true)
  })

  test('scheduled cleanup skips sealing even before merged publication', async () => {
    const { tempDir } = await createUploadDirectory(uploadId, false)
    await beginUploadCompletionSeal(uploadId)

    const result = await safelyCleanupMaterialUploadSession({
      uploadId,
      intent: 'sweep',
      minAgeMs: 8 * 60 * 60 * 1000,
    })

    expect(result.status).toBe('protected_sealing')
    await expect(stat(tempDir)).resolves.toMatchObject({})
  })

  test('state I/O ambiguity retains directory and session with a 503 result', async () => {
    const { tempDir, mergedPath } = await createUploadDirectory(uploadId)
    seedMemorySession(uploadId)
    const sealDir = path.join(uploadRoot, '.locks', 'completed-upload-sessions')
    await mkdir(path.join(sealDir, `${uploadId}.json`), { recursive: true })

    const result = await safelyCleanupMaterialUploadSession({
      uploadId,
      intent: 'cancel',
      expectedOwnerId: 'user-1',
    })

    expect(result).toMatchObject({
      success: false,
      status: 'unavailable',
      code: 'UPLOAD_SESSION_SEAL_INVALID',
      httpStatus: 503,
    })
    await expect(readFile(mergedPath, 'utf8')).resolves.toBe('data')
    await expect(stat(tempDir)).resolves.toMatchObject({})
    expect(uploadSessions.has(uploadId)).toBe(true)
  })

  test('cancellable session persists cancelled tombstone before deleting state and directory', async () => {
    const { tempDir } = await createUploadDirectory(uploadId, false)
    seedMemorySession(uploadId)

    const result = await safelyCleanupMaterialUploadSession({
      uploadId,
      intent: 'cancel',
      expectedOwnerId: 'user-1',
    })

    expect(result).toMatchObject({ success: true, status: 'deleted' })
    expect(uploadSessions.has(uploadId)).toBe(false)
    await expect(stat(tempDir)).rejects.toMatchObject({ code: 'ENOENT' })
    await expect(readUploadSessionSeal(uploadId)).resolves.toMatchObject({
      state: 'cancelled',
    })
    await expect(beginUploadCompletionSeal(uploadId)).rejects.toMatchObject({
      status: 409,
      code: 'UPLOAD_SESSION_CANCELLED',
    })
  })

  test('internal consumed cleanup removes completed assembled + temp data but retains seal', async () => {
    const { tempDir } = await createUploadDirectory(uploadId, false)
    const assembledPath = path.join(uploadRoot, 'assembled', `${uploadId}-source.bin`)
    await mkdir(path.dirname(assembledPath), { recursive: true })
    await writeFile(assembledPath, 'data')
    seedMemorySession(uploadId)
    const seal = await beginUploadCompletionSeal(uploadId)
    if (seal.state !== 'sealing') throw new Error('missing seal handle')
    await completeUploadCompletionSeal(seal.handle)

    const result = await cleanupConsumedUploadSession(uploadId)

    expect(result).toMatchObject({ success: true, status: 'deleted' })
    await expect(stat(tempDir)).rejects.toMatchObject({ code: 'ENOENT' })
    await expect(stat(assembledPath)).rejects.toMatchObject({ code: 'ENOENT' })
    await expect(readUploadSessionSeal(uploadId)).resolves.toMatchObject({
      state: 'completed',
    })
  })

  async function createUploadDirectory(id: string, withMerged = true) {
    const tempDir = path.join(uploadRoot, 'temp', id)
    const mergedPath = path.join(tempDir, 'merged-source.bin')
    await mkdir(tempDir, { recursive: true })
    await writeFile(path.join(tempDir, 'meta.json'), JSON.stringify({
      fileName: 'source.bin',
      fileSize: 4,
      totalChunks: 1,
      chunkSize: 4,
      userId: 'user-1',
      createdAt: Date.now() - 10 * 60 * 60 * 1000,
    }))
    if (withMerged) {
      await writeFile(mergedPath, 'data')
    } else {
      await writeFile(path.join(tempDir, 'chunk-0'), 'data')
    }
    return { tempDir, mergedPath }
  }

  function seedMemorySession(id: string) {
    const now = Date.now() - 10 * 60 * 60 * 1000
    const session: UploadSession = {
      fileName: 'source.bin',
      fileSize: 4,
      totalChunks: 1,
      chunkSize: 4,
      chunks: new Map([[0, path.join(uploadRoot, 'temp', id, 'chunk-0')]]),
      createdAt: now,
      userId: 'user-1',
    }
    uploadSessions.set(id, session)
  }
})