import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'

// Mock fetch globally
const mockFetch = vi.fn()
vi.stubGlobal('fetch', mockFetch)

// We need to reset modules between tests because nostr-auth.ts has module-level
// state (currentToken initialized from localStorage at import time)

function makeJwt(payload: Record<string, unknown>): string {
  const header = btoa(JSON.stringify({ alg: 'HS256', typ: 'JWT' }))
  const body = btoa(JSON.stringify(payload))
  const sig = 'fakesignature'
  return `${header}.${body}.${sig}`
}

describe('nostr-auth token storage', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    localStorage.clear()
  })

  afterEach(() => {
    localStorage.clear()
  })

  it('getToken returns null when no token set', async () => {
    vi.resetModules()
    const { getToken } = await import('../../lib/nostr-auth')
    expect(getToken()).toBeNull()
  })

  it('setToken / getToken round-trips', async () => {
    vi.resetModules()
    const { setToken, getToken } = await import('../../lib/nostr-auth')

    const token = makeJwt({ sub: 'testpub', exp: Math.floor(Date.now() / 1000) + 3600 })
    setToken(token)

    expect(getToken()).toBe(token)
    expect(localStorage.getItem('bf_token')).toBe(token)
  })

  it('setToken(null) clears token from memory and localStorage', async () => {
    vi.resetModules()
    localStorage.setItem('bf_token', 'old-token')
    const { setToken, getToken } = await import('../../lib/nostr-auth')

    setToken(null)

    expect(getToken()).toBeNull()
    expect(localStorage.getItem('bf_token')).toBeNull()
  })

  it('getToken restores from localStorage on module load', async () => {
    const token = makeJwt({ sub: 'pub123', exp: Math.floor(Date.now() / 1000) + 3600 })
    localStorage.setItem('bf_token', token)

    vi.resetModules()
    const { getToken } = await import('../../lib/nostr-auth')

    expect(getToken()).toBe(token)
  })
})

describe('isTokenExpired', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    localStorage.clear()
  })

  afterEach(() => {
    localStorage.clear()
  })

  it('returns true when no token is set', async () => {
    vi.resetModules()
    const { isTokenExpired } = await import('../../lib/nostr-auth')
    expect(isTokenExpired()).toBe(true)
  })

  it('returns true for expired JWT', async () => {
    // exp in the past
    const expired = makeJwt({ sub: 'pub', exp: Math.floor(Date.now() / 1000) - 60 })
    localStorage.setItem('bf_token', expired)

    vi.resetModules()
    const { isTokenExpired } = await import('../../lib/nostr-auth')
    expect(isTokenExpired()).toBe(true)
  })

  it('returns false for valid (non-expired) JWT', async () => {
    // exp 1 hour in the future
    const valid = makeJwt({ sub: 'pub', exp: Math.floor(Date.now() / 1000) + 3600 })
    localStorage.setItem('bf_token', valid)

    vi.resetModules()
    const { isTokenExpired } = await import('../../lib/nostr-auth')
    expect(isTokenExpired()).toBe(false)
  })

  it('returns true for malformed token (not 3 parts)', async () => {
    localStorage.setItem('bf_token', 'not-a-jwt')

    vi.resetModules()
    const { setToken, isTokenExpired } = await import('../../lib/nostr-auth')
    setToken('not-a-jwt')
    expect(isTokenExpired()).toBe(true)
  })

  it('returns true for token with no exp claim', async () => {
    const noExp = makeJwt({ sub: 'pub' })
    localStorage.setItem('bf_token', noExp)

    vi.resetModules()
    const { isTokenExpired } = await import('../../lib/nostr-auth')
    expect(isTokenExpired()).toBe(true)
  })
})

describe('authFetch', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    localStorage.clear()
  })

  afterEach(() => {
    localStorage.clear()
  })

  it('attaches Bearer token to request headers', async () => {
    const token = makeJwt({ sub: 'pub', exp: Math.floor(Date.now() / 1000) + 3600 })
    localStorage.setItem('bf_token', token)

    vi.resetModules()
    const { authFetch } = await import('../../lib/nostr-auth')

    mockFetch.mockResolvedValueOnce({ status: 200, ok: true })

    await authFetch('/api/test')

    expect(mockFetch).toHaveBeenCalledTimes(1)
    const [url, init] = mockFetch.mock.calls[0]
    expect(url).toBe('/api/test')
    const headers = init.headers as Headers
    expect(headers.get('Authorization')).toBe(`Bearer ${token}`)
  })

  it('does not attach token when no token is set', async () => {
    vi.resetModules()
    const { authFetch } = await import('../../lib/nostr-auth')

    mockFetch.mockResolvedValueOnce({ status: 200, ok: true })

    await authFetch('/api/public')

    const [, init] = mockFetch.mock.calls[0]
    const headers = init.headers as Headers
    expect(headers.get('Authorization')).toBeNull()
  })

  it('does not attach expired token', async () => {
    const expired = makeJwt({ sub: 'pub', exp: Math.floor(Date.now() / 1000) - 60 })
    localStorage.setItem('bf_token', expired)

    vi.resetModules()
    const { authFetch } = await import('../../lib/nostr-auth')

    mockFetch.mockResolvedValueOnce({ status: 200, ok: true })

    await authFetch('/api/test')

    const [, init] = mockFetch.mock.calls[0]
    const headers = init.headers as Headers
    expect(headers.get('Authorization')).toBeNull()
  })

  it('clears token on 401 response', async () => {
    const token = makeJwt({ sub: 'pub', exp: Math.floor(Date.now() / 1000) + 3600 })
    localStorage.setItem('bf_token', token)

    vi.resetModules()
    const { authFetch, getToken } = await import('../../lib/nostr-auth')

    mockFetch.mockResolvedValueOnce({ status: 401, ok: false })

    await authFetch('/api/protected')

    expect(getToken()).toBeNull()
    expect(localStorage.getItem('bf_token')).toBeNull()
  })

  it('preserves token on non-401 error responses', async () => {
    const token = makeJwt({ sub: 'pub', exp: Math.floor(Date.now() / 1000) + 3600 })
    localStorage.setItem('bf_token', token)

    vi.resetModules()
    const { authFetch, getToken } = await import('../../lib/nostr-auth')

    mockFetch.mockResolvedValueOnce({ status: 500, ok: false })

    await authFetch('/api/broken')

    expect(getToken()).toBe(token)
  })

  it('passes through custom request init options', async () => {
    const token = makeJwt({ sub: 'pub', exp: Math.floor(Date.now() / 1000) + 3600 })
    localStorage.setItem('bf_token', token)

    vi.resetModules()
    const { authFetch } = await import('../../lib/nostr-auth')

    mockFetch.mockResolvedValueOnce({ status: 200, ok: true })

    await authFetch('/api/data', {
      method: 'POST',
      body: JSON.stringify({ key: 'value' }),
    })

    const [, init] = mockFetch.mock.calls[0]
    expect(init.method).toBe('POST')
    expect(init.body).toBe(JSON.stringify({ key: 'value' }))
  })
})