import { describe, it, expect, vi, beforeEach } from 'vitest'
import { mount, flushPromises } from '@vue/test-utils'
import { setActivePinia, createPinia } from 'pinia'
import { createRouter, createMemoryHistory } from 'vue-router'
import FileManagerView from '../views/FileManagerView.vue'

vi.mock('../api/client.js', () => ({
  listFolders: vi.fn().mockResolvedValue({ items: [] }),
  listDocuments: vi.fn().mockResolvedValue({ items: [], total: 0 }),
  getFolder: vi.fn().mockResolvedValue({ id: 'f1', name: 'Test', breadcrumb: [] }),
  createFolder: vi.fn(),
  renameFolder: vi.fn(),
  deleteFolder: vi.fn(),
  moveDocument: vi.fn(),
  deleteDocument: vi.fn().mockResolvedValue(null),
  getSharedWithMe: vi.fn().mockResolvedValue([]),
  listTopics: vi.fn().mockResolvedValue([]),
  getMyQuota: vi.fn().mockResolvedValue({ used_bytes: 0, limit_bytes: 104857600 }),
}))

vi.mock('../stores/auth.js', () => ({
  useAuthStore: () => ({
    user: { email: 'test@example.com', role: 'user' },
    accessToken: 'fake-token',
    fetchQuota: vi.fn().mockResolvedValue(null),
  }),
}))

vi.mock('../stores/topics.js', () => ({
  useTopicsStore: () => ({
    topics: [],
    loading: false,
    fetchTopics: vi.fn().mockResolvedValue(null),
  }),
}))

vi.mock('../components/ui/BreadcrumbBar.vue', () => ({
  default: { template: '<nav/>', props: ['segments', 'rootLabel'], emits: ['navigate'] },
}))
vi.mock('../components/upload/DropZone.vue', () => ({
  default: { template: '<div class="dropzone"/>', emits: ['files-selected'] },
}))
vi.mock('../components/upload/UploadProgress.vue', () => ({
  default: { template: '<div/>', props: ['items'] },
}))
vi.mock('../components/folders/FolderDeleteModal.vue', () => ({
  default: { template: '<div/>', props: ['folder'], emits: ['confirm', 'cancel'] },
}))
vi.mock('../components/sharing/ShareModal.vue', () => ({
  default: { template: '<div/>', props: ['doc'], emits: ['close'] },
}))
vi.mock('../components/documents/SearchBar.vue', () => ({
  default: { template: '<input/>', props: ['modelValue'] },
}))
vi.mock('../components/documents/SortControls.vue', () => ({
  default: { template: '<div/>', props: ['sort', 'order'], emits: ['change'] },
}))
vi.mock('../components/topics/TopicBadge.vue', () => ({
  default: { template: '<span/>', props: ['name', 'color'] },
}))

function makeRouter() {
  return createRouter({
    history: createMemoryHistory(),
    routes: [
      { path: '/', component: FileManagerView },
      { path: '/folders/:folderId', component: FileManagerView },
    ],
  })
}

async function mountFileManager(path = '/') {
  setActivePinia(createPinia())
  const router = makeRouter()
  await router.push(path)
  await router.isReady()
  const w = mount(FileManagerView, {
    global: { plugins: [router], stubs: { QuotaBar: true, AppSpinner: true } },
  })
  await flushPromises()
  return w
}

describe('UX-05: "/" focuses the search bar', () => {
  it('FileManagerView exposes focusSearch() that delegates to browserRef.focusSearch', async () => {
    const w = await mountFileManager()
    const focusSpy = vi.fn()
    const browserRef = w.vm.$.setupState.browserRef
    if (browserRef?.value) browserRef.value.focusSearch = focusSpy
    expect(typeof w.vm.focusSearch).toBe('function')
  })

  it('calling focusSearch() on the exposed interface does not throw when no ref mounted', async () => {
    const w = await mountFileManager()
    expect(() => w.vm.focusSearch()).not.toThrow()
  })

  it('focusSearch is part of defineExpose (accessible via vm)', async () => {
    const w = await mountFileManager()
    expect(w.vm.focusSearch).toBeDefined()
  })
})

describe('UX-06: "Escape" clears active search (when no input focused)', () => {
  it('FileManagerView exposes clearSearch() method', async () => {
    const w = await mountFileManager()
    expect(typeof w.vm.clearSearch).toBe('function')
  })

  it('calling clearSearch() does not throw', async () => {
    const w = await mountFileManager()
    expect(() => w.vm.clearSearch()).not.toThrow()
  })
})

describe('UX-07: "U" triggers the upload picker', () => {
  it('FileManagerView exposes triggerUpload() method', async () => {
    const w = await mountFileManager()
    expect(typeof w.vm.triggerUpload).toBe('function')
  })

  it('calling triggerUpload() does not throw', async () => {
    const w = await mountFileManager()
    expect(() => w.vm.triggerUpload()).not.toThrow()
  })
})

describe('UX-08: "N" starts new folder input', () => {
  it('FileManagerView exposes startNewFolder() method', async () => {
    const w = await mountFileManager()
    expect(typeof w.vm.startNewFolder).toBe('function')
  })

  it('calling startNewFolder() via exposed interface delegates to browserRef without throwing', async () => {
    const w = await mountFileManager()
    expect(() => w.vm.startNewFolder()).not.toThrow()
  })
})

describe('Gap 4: getFileManagerInstance resolves to actual component, not RouterView proxy', () => {
  it('matched.find(r => r.instances?.default) returns an object with focusSearch defined when mounted via router-view', async () => {
    setActivePinia(createPinia())
    const router = makeRouter()
    await router.push('/')
    await router.isReady()
    // Mount via a router-view wrapper so Vue Router populates r.instances.default
    const { defineComponent, h } = await import('vue')
    const { RouterView } = await import('vue-router')
    const App = defineComponent({ render: () => h(RouterView) })
    mount(App, {
      global: { plugins: [router], stubs: { QuotaBar: true, AppSpinner: true } },
    })
    await flushPromises()
    const instance = router.currentRoute.value.matched.find(r => r.instances?.default)?.instances?.default
    expect(instance).not.toBeNull()
    expect(instance).toBeDefined()
    expect(typeof instance.focusSearch).toBe('function')
  })
})