import { mkdtempSync, rmSync } from 'node:fs'
import { tmpdir } from 'node:os'
import { join } from 'node:path'
import { afterEach, beforeEach, expect, it, vi } from 'vitest'
import * as environmentStore from '../../src/shared/runtime-environment-store'
import {
  RUNTIME_PROTOCOL_VERSION,
  MIN_COMPATIBLE_RUNTIME_CLIENT_VERSION
} from '../../src/shared/protocol-version'
import { callRuntimeEnvironment } from '../../src/main/ipc/runtime-environments/runtime-environment-transport-routing'
import {
  structuredSessionSelectionController,
  forgetStructuredSessionSelection,
  registerStructuredSelectionCatalogStore
} from '@/lib/structured-agent-session-selection-controller'
import { replaceRuntimeEnvironmentRevisions } from '@/runtime/runtime-environment-revision'
import { callRuntimeRpc } from '@/runtime/runtime-rpc-client'
import { resetRuntimeEnvironmentStatusOwners } from '../../src/main/ipc/runtime-environments/runtime-environment-request-connections'
import { pairingCode } from '../../src/main/ipc/runtime-environments/runtime-environments-ipc-test-harness'

const { sendRemoteRuntimeRequestMock, getPathMock } = vi.hoisted(() => ({
  sendRemoteRuntimeRequestMock: vi.fn(),
  getPathMock: vi.fn()
}))

vi.mock('electron', () => ({
  BrowserWindow: { getAllWindows: () => [] },
  app: { getPath: getPathMock },
  ipcMain: { handle: vi.fn(), on: vi.fn(), removeHandler: vi.fn(), removeAllListeners: vi.fn() }
}))
vi.mock('../../src/shared/remote-runtime/remote-runtime-client', () => ({
  sendRemoteRuntimeRequest: sendRemoteRuntimeRequestMock,
  subscribeRemoteRuntimeRequest: vi.fn()
}))
vi.mock(
  '../../src/main/ipc/runtime-environments/runtime-environment-request-connections',
  async () => {
    const { withRuntimeStatusOwners } =
      await import('../../src/main/ipc/runtime-environments/runtime-environments-ipc-test-harness')
    return withRuntimeStatusOwners({
      sendRemoteRuntimeConnectionRequest: vi.fn(),
      sendRemoteRuntimeSharedControlRequest: vi.fn(),
      subscribeRemoteRuntimeSharedControlRequest: vi.fn(),
      getRemoteRuntimeSharedControlDiagnostics: vi.fn(() => null),
      reconnectRemoteRuntimeSharedControlConnection: vi.fn(),
      retryRemoteRuntimeSharedControlConnectionsNow: vi.fn(),
      ensureRemoteRuntimeSharedControlConnection: vi.fn(),
      pauseRemoteRuntimeSharedControlRetry: vi.fn(),
      closeRemoteRuntimeRequestConnection: vi.fn()
    })
  }
)

let userDataPath: string
beforeEach(() => {
  userDataPath = mkdtempSync(join(tmpdir(), 'orca-selection-affinity-'))
  getPathMock.mockReturnValue(userDataPath)
})
afterEach(() => {
  vi.restoreAllMocks()
  resetRuntimeEnvironmentStatusOwners()
  vi.unstubAllGlobals()
  rmSync(userDataPath, { recursive: true, force: true })
})

it('fences deferred selection at the real queue and follows only proved pairing continuity, including late memory', async () => {
  const original = environmentStore.addEnvironmentFromPairingCode(userDataPath, {
    name: 'selection-owner',
    pairingCode: pairingCode(),
    now: 1
  })
  const target = { kind: 'environment', environmentId: original.id } as const
  replaceRuntimeEnvironmentRevisions([original])
  vi.stubGlobal('window', {
    api: {
      runtimeEnvironments: {
        call: (args: {
          selector: string
          method: string
          params?: unknown
          expectedEnvironmentPairingRevision?: number
        }) =>
          callRuntimeEnvironment(
            userDataPath,
            args.selector,
            args.method,
            args.params,
            undefined,
            args.expectedEnvironmentPairingRevision
          )
      }
    }
  })
  const restoreCatalog = registerStructuredSelectionCatalogStore({
    read: () => ({ runtimeEnvironmentCatalogHydrated: true }),
    subscribe: () => () => {}
  })
  try {
    const owner = structuredSessionSelectionController(target, 'selection-queue', 'codex')
    const release = Promise.withResolvers<void>()
    sendRemoteRuntimeRequestMock.mockImplementation(async (_connection, method) => {
      if (method === 'files.read') {
        await release.promise
      }
      return {
        id: method,
        ok: true,
        result:
          method === 'status.get'
            ? {
                runtimeId: 'host',
                runtimeProtocolVersion: RUNTIME_PROTOCOL_VERSION,
                minCompatibleRuntimeClientVersion: MIN_COMPATIBLE_RUNTIME_CLIENT_VERSION
              }
            : {},
        _meta: { runtimeId: 'host' }
      }
    })
    const occupying = Array.from({ length: 8 }, () =>
      callRuntimeEnvironment(userDataPath, original.id, 'files.read', {})
    )
    await vi.waitFor(() =>
      expect(
        sendRemoteRuntimeRequestMock.mock.calls.filter(([, method]) => method === 'files.read')
      ).toHaveLength(8)
    )
    const sendPick = (options: { expectedEnvironmentPairingRevision?: number }) =>
      callRuntimeRpc(
        target,
        'agentSession.setOption',
        {},
        { ...options, skipCompatibilityCheck: true }
      )
    const queued = owner.request(sendPick)
    const changed = environmentStore.updateEnvironmentFromPairingCode(userDataPath, original.id, {
      pairingCode: pairingCode(),
      now: 2
    })
    replaceRuntimeEnvironmentRevisions([changed], {
      retired: [],
      sameHost: [],
      pending: [{ id: original.id, fromRevision: 1 }]
    })
    release.resolve()
    await Promise.all(occupying)
    await expect(queued).rejects.toMatchObject({ code: 'runtime_environment_changed' })
    expect(
      sendRemoteRuntimeRequestMock.mock.calls.some(
        ([, method]) => method === 'agentSession.setOption'
      )
    ).toBe(false)
    expect(structuredSessionSelectionController(target, 'selection-queue', 'codex')).toBe(owner)
    const accepted = owner.issue('model', 'gpt-5.4', null)
    owner.settle(accepted, { kind: 'accepted', options: { model: 'gpt-5.4' } })
    // Memory starts with the original revision too; the pending replacement cannot receive it.
    await Promise.resolve()
    expect(
      sendRemoteRuntimeRequestMock.mock.calls.some(
        ([, method]) => method === 'settings.mutateNativeChatSessionOptions'
      )
    ).toBe(false)
    replaceRuntimeEnvironmentRevisions([changed], {
      retired: [],
      sameHost: [{ id: original.id, fromRevision: 1, toRevision: changed.pairingRevision! }]
    })
    await owner.request(sendPick)
    const later = owner.issue('model', 'gpt-5.3-codex', null)
    owner.settle(later, { kind: 'accepted', options: { model: 'gpt-5.3-codex' } })
    await vi.waitFor(() =>
      expect(
        sendRemoteRuntimeRequestMock.mock.calls.filter(
          ([, method]) => method === 'settings.mutateNativeChatSessionOptions'
        )
      ).toHaveLength(1)
    )
    forgetStructuredSessionSelection('selection-queue', target)
    const count = sendRemoteRuntimeRequestMock.mock.calls.length
    await expect(
      owner.request((options) => callRuntimeRpc(target, 'agentSession.setOption', {}, options))
    ).rejects.toThrow('retired')
    expect(sendRemoteRuntimeRequestMock).toHaveBeenCalledTimes(count)
  } finally {
    forgetStructuredSessionSelection('selection-queue', target)
    replaceRuntimeEnvironmentRevisions([])
    restoreCatalog()
  }
})