// Regression: a signed offline license key must survive (a) app restarts more than
// 30 days after activation and (b) a cloud sign-in followed by sign-out.
// A "restart" is simulated by calling initialize() again on the same service,
// which reloads every field from the license store.

import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
import { generateLicenseKeyPair, issueSignedLicenseKey } from '@d3ro/core/utils/crypto-license'
import {
  getLicenseService,
  resetLicenseServiceForTests,
} from '../../../src/main/services/LicenseService'

const DAY_MS = 24 * 60 * 60 * 1000
const T0 = new Date('2026-01-01T00:00:00Z').getTime()

let previousPublicKey: string | undefined
/** issueKey() generates a fresh key pair per call; remember the public key per issued key. */
const publicKeyByLicense = new Map<string, string>()

function previousKeyFor(key: string): string {
  const pem = publicKeyByLicense.get(key)
  if (!pem) throw new Error('unknown key')
  return pem
}

function issueKey(tier: 'pro' | 'pro_plus', expiresAt: number | null): string {
  const { publicKeyPem, privateKeyPem } = generateLicenseKeyPair()
  process.env.D3RO_LICENSE_PUBLIC_KEY = publicKeyPem
  const key = issueSignedLicenseKey(
    {
      licenseId: `lic-r1-11-${tier}`,
      tier,
      customerEmail: 'buyer@example.test',
      issuedAt: T0,
      expiresAt,
      machineId: null,
    },
    privateKeyPem,
  )
  publicKeyByLicense.set(key, publicKeyPem)
  return key
}

beforeEach(() => {
  previousPublicKey = process.env.D3RO_LICENSE_PUBLIC_KEY
  vi.useFakeTimers()
  vi.setSystemTime(T0)
  resetLicenseServiceForTests()
})

afterEach(() => {
  vi.useRealTimers()
  if (previousPublicKey === undefined) delete process.env.D3RO_LICENSE_PUBLIC_KEY
  else process.env.D3RO_LICENSE_PUBLIC_KEY = previousPublicKey
  resetLicenseServiceForTests()
})

describe('LicenseService — signed offline key lifetime (redteam r1-11)', () => {
  it('keeps a one-year pro key after a restart 31 days after activation', async () => {
    const key = issueKey('pro', T0 + 365 * DAY_MS)
    const svc = getLicenseService()
    svc.initialize()
    const result = await svc.activate(key)
    expect(result.success).toBe(true)

    vi.setSystemTime(T0 + 31 * DAY_MS)
    svc.initialize()

    expect(svc.tier).toBe('pro')
    expect(svc.getInfo().licenseKey).toBe(key)
    expect(svc.getInfo().expiresAt).toBe(T0 + 365 * DAY_MS)
  })

  it('keeps a perpetual key after a restart a year later', async () => {
    const key = issueKey('pro_plus', null)
    const svc = getLicenseService()
    svc.initialize()
    await svc.activate(key)

    vi.setSystemTime(T0 + 400 * DAY_MS)
    svc.initialize()

    expect(svc.tier).toBe('pro_plus')
    expect(svc.getInfo().licenseKey).toBe(key)
  })

  it('drops the key once its own expiresAt has passed', async () => {
    const key = issueKey('pro', T0 + 60 * DAY_MS)
    const svc = getLicenseService()
    svc.initialize()
    await svc.activate(key)

    vi.setSystemTime(T0 + 61 * DAY_MS)
    svc.initialize()

    expect(svc.tier).toBe('free')
    expect(svc.getInfo().licenseKey).toBeNull()
  })

  it('a free cloud account does not demote the key, before or after a restart', async () => {
    const key = issueKey('pro', T0 + 365 * DAY_MS)
    const svc = getLicenseService()
    svc.initialize()
    await svc.activate(key)

    svc.syncFromCloud('free')
    expect(svc.tier).toBe('pro')

    svc.initialize()
    expect(svc.tier).toBe('pro')
    expect(svc.getInfo().licenseKey).toBe(key)
  })

  it('sign-out after a pro cloud account keeps the key and its tier', async () => {
    const key = issueKey('pro', T0 + 365 * DAY_MS)
    const svc = getLicenseService()
    svc.initialize()
    await svc.activate(key)

    svc.syncFromCloud('pro_plus')
    expect(svc.tier).toBe('pro_plus')

    svc.resetToFree()
    expect(svc.tier).toBe('pro')
    expect(svc.getInfo().licenseKey).toBe(key)

    svc.initialize()
    expect(svc.tier).toBe('pro')
    expect(svc.getInfo().licenseKey).toBe(key)
  })

  it('a higher cloud tier wins over the key and survives a restart until sign-out', async () => {
    const key = issueKey('pro', T0 + 365 * DAY_MS)
    const svc = getLicenseService()
    svc.initialize()
    await svc.activate(key)
    svc.syncFromCloud('pro_plus')

    svc.initialize()
    expect(svc.tier).toBe('pro_plus')

    svc.resetToFree()
    expect(svc.tier).toBe('pro')
  })

  it('emits tier-changed only when the effective tier changes', async () => {
    const key = issueKey('pro', T0 + 365 * DAY_MS)
    const svc = getLicenseService()
    svc.initialize()
    await svc.activate(key)
    const tiers: string[] = []
    svc.on('tier-changed', (info: { tier: string }) => tiers.push(info.tier))

    svc.syncFromCloud('free')
    svc.syncFromCloud('pro')
    svc.syncFromCloud('pro_plus')
    svc.resetToFree()

    expect(tiers).toEqual(['pro_plus', 'pro'])
  })

  it('deactivate clears the key but keeps the cloud tier', async () => {
    const key = issueKey('pro', T0 + 365 * DAY_MS)
    const svc = getLicenseService()
    svc.initialize()
    await svc.activate(key)
    svc.syncFromCloud('pro_plus')

    await svc.deactivate()
    expect(svc.getInfo().licenseKey).toBeNull()
    expect(svc.tier).toBe('pro_plus')

    svc.resetToFree()
    expect(svc.tier).toBe('free')
  })

  it('does not erase a stored key it cannot verify at startup (e.g. verification key missing)', async () => {
    const key = issueKey('pro', T0 + 365 * DAY_MS)
    const svc = getLicenseService()
    svc.initialize()
    await svc.activate(key)

    // Verification key rotated / missing: the key is not honoured, but it stays on disk.
    const { publicKeyPem } = generateLicenseKeyPair()
    process.env.D3RO_LICENSE_PUBLIC_KEY = publicKeyPem
    svc.initialize()
    expect(svc.tier).toBe('free')

    // Restored verification key: the same stored key is honoured again.
    process.env.D3RO_LICENSE_PUBLIC_KEY = previousKeyFor(key)
    svc.initialize()
    expect(svc.tier).toBe('pro')
    expect(svc.getInfo().licenseKey).toBe(key)
  })

  it('a reverse trial still ends after 14 days', () => {
    const svc = getLicenseService()
    svc.initialize()
    expect(svc.startTrial('trial@example.test').success).toBe(true)
    expect(svc.tier).toBe('pro_plus')

    vi.setSystemTime(T0 + 13 * DAY_MS)
    svc.initialize()
    expect(svc.tier).toBe('pro_plus')

    vi.setSystemTime(T0 + 15 * DAY_MS)
    svc.initialize()
    expect(svc.tier).toBe('free')
    expect(svc.getInfo().isTrial).toBe(false)
    expect(svc.startTrial('again@example.test').success).toBe(false)
  })
})