import { beforeEach, describe, expect, it, vi } from 'vitest'
import { mountAddMachine } from '../src/add-machine'
import { ApiError } from '../src/errors'
import type { ApiClient } from '../src/api-client'
import type { HostRecord } from '../src/api-schemas'

function host(subdomain: string, status: HostRecord['status'] = 'online'): HostRecord {
  return {
    hostId: `id-${subdomain}`,
    accountId: 'acc',
    subdomain,
    agentPubkey: new Uint8Array([1]),
    enrollFpr: `fpr-${subdomain}`,
    status,
    lastSeen: '2026-01-01T00:00:00Z',
    createdAt: '2026-01-01T00:00:00Z',
    revokedAt: null,
  }
}

function fakeApi(over: Partial<ApiClient>): ApiClient {
  return {
    listHosts: vi.fn(async () => []),
    getHost: vi.fn(),
    requestPairingCode: vi.fn(),
    hostStatus: vi.fn(),
    issueCapabilityToken: vi.fn(),
    ...over,
  } as unknown as ApiClient
}

const flush = () => new Promise((r) => setTimeout(r, 0))
const tick = (ms: number) => new Promise((r) => setTimeout(r, ms))

describe('mountAddMachine (T6)', () => {
  let root: HTMLElement
  beforeEach(() => {
    root = document.createElement('div')
    document.body.append(root)
  })

  it('happy path: shows npx command, detects a newly online host, fires onPaired once', async () => {
    let call = 0
    const listHosts = vi.fn(async () => (call++ === 0 ? [] : [host('newbox')]))
    const requestPairingCode = vi.fn(async () => ({ code: 'ABCD-1234', expiresAt: futureIso() }))
    const onPaired = vi.fn()
    const api = fakeApi({ listHosts, requestPairingCode })
    const add = mountAddMachine(root, api, { pollMs: 5, onPaired })

    await add.start()
    await flush()
    await flush()
    await flush()

    expect(root.querySelector('.pair-command')?.textContent).toBe(
      'npx web-terminal-agent pair ABCD-1234',
    )
    expect(onPaired).toHaveBeenCalledExactlyOnceWith('id-newbox')
    add.dispose()
  })

  it('expired code: after expiresAt it shows "expired", clears the code, and stops polling', async () => {
    let t = 1_000_000
    const requestPairingCode = vi.fn(async () => ({ code: 'EXP-0001', expiresAt: new Date(t + 50).toISOString() }))
    const listHosts = vi.fn(async () => [])
    const api = fakeApi({ listHosts, requestPairingCode })
    const add = mountAddMachine(root, api, { pollMs: 5, now: () => t })

    await add.start()
    t += 100 // advance past expiry
    await tick(25) // let the poll interval fire and catch expiry

    expect(root.querySelector('.pair-status')?.textContent).toContain('expired')
    expect(root.querySelector('.pair-command')?.textContent).toBe('')
    const callsAtExpiry = listHosts.mock.calls.length
    await tick(25)
    expect(listHosts.mock.calls.length).toBe(callsAtExpiry) // polling stopped
    add.dispose()
  })

  it('a requestPairingCode failure surfaces an error and does not start an infinite poll', async () => {
    const requestPairingCode = vi.fn(async () => {
      throw new ApiError('http', 'nope', 500)
    })
    const listHosts = vi.fn(async () => [])
    const add = mountAddMachine(root, fakeApi({ requestPairingCode, listHosts }), { pollMs: 5 })
    await add.start()
    await flush()
    expect(root.querySelector('.pair-error')?.textContent).toContain('Could not issue a code')
    add.dispose()
  })

  it('renders the code via textContent only (no HTML injection)', async () => {
    const requestPairingCode = vi.fn(async () => ({ code: '<img src=x>', expiresAt: futureIso() }))
    const add = mountAddMachine(root, fakeApi({ requestPairingCode }), { pollMs: 100000 })
    await add.start()
    const cmd = root.querySelector('.pair-command') as HTMLElement
    expect(cmd.querySelector('img')).toBeNull()
    expect(cmd.textContent).toContain('<img src=x>')
    add.dispose()
  })
})

function futureIso(): string {
  return new Date(Date.now() + 120_000).toISOString()
}