import { beforeEach, describe, expect, it, vi } from 'vitest'
import { createPinia, setActivePinia } from 'pinia'
import { useAuthStore, type AuthUser } from '../app/stores/auth'

type AuthPlugin = typeof import('../app/plugins/auth').default

function createRuntimeConfig(authMode: string | undefined = undefined) {
  return {
    public: {
      authMode,
      authLoginUrl: '/login',
      authLogoutUrl: '/logout',
      authUserinfoUrl: '/api/auth/me'
    }
  }
}

async function loadPlugin() {
  vi.resetModules()
  vi.stubGlobal('defineNuxtPlugin', (setup: AuthPlugin) => setup)

  return (await import('../app/plugins/auth')).default
}

describe('auth plugin', () => {
  beforeEach(() => {
    setActivePinia(createPinia())
    vi.restoreAllMocks()
    vi.unstubAllGlobals()
  })

  it('initializes a disabled auth client and keeps auth turned off', async () => {
    vi.stubGlobal('useRuntimeConfig', () => createRuntimeConfig())

    const plugin = await loadPlugin()
    const { provide } = plugin()
    const auth = provide.auth

    expect(auth.mode).toBe('disabled')
    expect(auth.isEnabled).toBe(false)

    await auth.ensureInitialized()

    const store = useAuthStore()
    expect(auth.isReady.value).toBe(true)
    expect(auth.isAuthenticated.value).toBe(false)
    expect(store.isInitialized).toBe(true)
    expect(store.user).toBeNull()
  })

  it('uses a mock user in mock mode and supports login and logout locally', async () => {
    vi.stubGlobal('useRuntimeConfig', () => createRuntimeConfig('mock'))

    const plugin = await loadPlugin()
    const { provide } = plugin()
    const auth = provide.auth

    await auth.ensureInitialized()

    const store = useAuthStore()
    expect(auth.mode).toBe('mock')
    expect(auth.isEnabled).toBe(true)
    expect(auth.isAuthenticated.value).toBe(true)
    expect(store.user).toMatchObject({
      id: 'mock-user',
      email: 'mock@example.com',
      roles: ['USER']
    })

    auth.logout()
    expect(store.user).toBeNull()

    auth.login()
    expect(store.user).toMatchObject({
      id: 'mock-user',
      email: 'mock@example.com'
    })
  })

  it('loads the current user from the userinfo endpoint in userinfo mode', async () => {
    const fetchMock = vi.fn().mockResolvedValue({
      id: 'user-1',
      email: 'john@example.com',
      roles: ['USER']
    } satisfies AuthUser)

    vi.stubGlobal('useRuntimeConfig', () => createRuntimeConfig('userinfo'))
    vi.stubGlobal('$fetch', fetchMock)

    const plugin = await loadPlugin()
    const { provide } = plugin()
    const auth = provide.auth

    await auth.ensureInitialized()

    const store = useAuthStore()
    expect(fetchMock).toHaveBeenCalledWith('/api/auth/me', {
      credentials: 'include'
    })
    expect(auth.isAuthenticated.value).toBe(true)
    expect(store.user).toMatchObject({
      id: 'user-1',
      email: 'john@example.com'
    })
  })

  it('falls back to an anonymous session when userinfo loading fails', async () => {
    const fetchMock = vi.fn().mockRejectedValue(new Error('network error'))

    vi.stubGlobal('useRuntimeConfig', () => createRuntimeConfig('userinfo'))
    vi.stubGlobal('$fetch', fetchMock)

    const plugin = await loadPlugin()
    const { provide } = plugin()
    const auth = provide.auth

    await auth.ensureInitialized()

    const store = useAuthStore()
    expect(auth.isReady.value).toBe(true)
    expect(auth.isAuthenticated.value).toBe(false)
    expect(store.isInitialized).toBe(true)
    expect(store.user).toBeNull()
  })

  it('redirects login and logout in userinfo mode', async () => {
    vi.stubGlobal('useRuntimeConfig', () => createRuntimeConfig('userinfo'))
    vi.stubGlobal('$fetch', vi.fn().mockResolvedValue(null))
    vi.stubGlobal('window', {
      location: {
        href: ''
      }
    })

    const plugin = await loadPlugin()
    const { provide } = plugin()
    const auth = provide.auth

    auth.login()
    expect(window.location.href).toBe('/login')

    const store = useAuthStore()
    store.setUser({
      id: 'user-2',
      roles: ['USER']
    })

    auth.logout()
    expect(window.location.href).toBe('/logout')
    expect(store.user).toBeNull()
  })
})