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

// ── API mock ──────────────────────────────────────────────────────────────────

const mockListFolders = vi.fn()
const mockListDocuments = vi.fn()
const mockGetFolder = vi.fn()
const mockCreateFolder = vi.fn()
const mockRenameFolder = vi.fn()
const mockDeleteFolder = vi.fn()
const mockMoveDocument = vi.fn()

vi.mock('../../api/client.js', () => ({
  listFolders: (...a) => mockListFolders(...a),
  listDocuments: (...a) => mockListDocuments(...a),
  getFolder: (...a) => mockGetFolder(...a),
  createFolder: (...a) => mockCreateFolder(...a),
  renameFolder: (...a) => mockRenameFolder(...a),
  deleteFolder: (...a) => mockDeleteFolder(...a),
  moveDocument: (...a) => mockMoveDocument(...a),
  deleteDocument: vi.fn().mockResolvedValue(null),
  getSharedWithMe: vi.fn().mockResolvedValue([]),
  listTopics: vi.fn().mockResolvedValue([]),
  getMyQuota: vi.fn().mockResolvedValue({ used_bytes: 0, limit_bytes: 104857600 }),
}))

// Stub heavy child components so we only test FileManagerView logic
vi.mock('../../components/folders/FolderBreadcrumb.vue', () => ({
  default: { template: '<nav><slot/></nav>', props: ['segments'], 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'] },
}))
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),
  }),
}))

// ── Helpers ───────────────────────────────────────────────────────────────────

function makeFolder(overrides = {}) {
  return {
    id: overrides.id ?? 'f1',
    name: overrides.name ?? 'TestFolder',
    parent_id: overrides.parent_id ?? null,
    has_children: overrides.has_children ?? false,
    created_at: '2026-01-01T00:00:00Z',
    ...overrides,
  }
}

function makeDoc(overrides = {}) {
  return {
    id: overrides.id ?? 'd1',
    original_name: overrides.original_name ?? 'test.pdf',
    filename: 'test.pdf',
    mime_type: 'application/pdf',
    size_bytes: 1024,
    topics: [],
    folder_id: overrides.folder_id ?? 'f1',
    created_at: '2026-01-01T00:00:00Z',
    ...overrides,
  }
}

function makeRouter() {
  return createRouter({
    history: createMemoryHistory(),
    routes: [
      { path: '/', component: FileManagerView },
      { path: '/folders/:folderId', component: FileManagerView },
      { path: '/document/:id', component: { template: '<div/>' } },
    ],
  })
}

async function mountView(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, router }
}

// ── Tests ─────────────────────────────────────────────────────────────────────

describe('FileManagerView — root navigation', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    mockListFolders.mockResolvedValue({ items: [] })
    mockListDocuments.mockResolvedValue({ items: [], total: 0 })
    mockGetFolder.mockResolvedValue({ id: 'f1', name: 'Test', breadcrumb: [] })
  })

  it('at root (/), fetches root folders via listFolders(null)', async () => {
    const roots = [makeFolder({ id: 'r1', name: 'Root1' })]
    mockListFolders.mockResolvedValue({ items: roots })

    await mountView('/')

    expect(mockListFolders).toHaveBeenCalledWith(null)
  })

  it('at root, renders root folders in the item list', async () => {
    mockListFolders.mockResolvedValue({ items: [makeFolder({ id: 'r1', name: 'MyFolder' })] })

    const { w } = await mountView('/')

    expect(w.text()).toContain('MyFolder')
  })

  it('root view does NOT call listDocuments', async () => {
    await mountView('/')
    expect(mockListDocuments).not.toHaveBeenCalled()
  })
})

describe('FileManagerView — folder navigation', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    mockListFolders.mockResolvedValue({ items: [] })
    mockListDocuments.mockResolvedValue({ items: [], total: 0 })
    mockGetFolder.mockResolvedValue({ id: 'f1', name: 'Test', breadcrumb: [{ id: 'f1', name: 'Test' }] })
  })

  it('at /folders/:id, fetches that folder\'s children', async () => {
    const children = [makeFolder({ id: 'c1', name: 'Child', parent_id: 'f1' })]
    mockListFolders.mockResolvedValue({ items: children })

    await mountView('/folders/f1')

    expect(mockListFolders).toHaveBeenCalledWith('f1')
  })

  it('at /folders/:id, fetches documents for that folder', async () => {
    await mountView('/folders/f1')

    expect(mockListDocuments).toHaveBeenCalledWith(
      expect.objectContaining({ folderId: 'f1' })
    )
  })

  it('renders subfolder rows', async () => {
    mockListFolders.mockResolvedValue({
      items: [makeFolder({ id: 'sub1', name: 'SubFolder', parent_id: 'f1' })],
    })

    const { w } = await mountView('/folders/f1')

    expect(w.text()).toContain('SubFolder')
  })

  it('renders document rows', async () => {
    mockListDocuments.mockResolvedValue({
      items: [makeDoc({ id: 'd1', original_name: 'report.pdf' })],
      total: 1,
    })

    const { w } = await mountView('/folders/f1')

    expect(w.text()).toContain('report.pdf')
  })
})

describe('FileManagerView — folder row click navigation', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    mockListFolders.mockResolvedValue({ items: [] })
    mockListDocuments.mockResolvedValue({ items: [], total: 0 })
    mockGetFolder.mockResolvedValue({ id: 'f1', name: 'Test', breadcrumb: [] })
  })

  async function setupWithFolders(folders) {
    mockListFolders.mockResolvedValue({ items: folders })
    const { w, router } = await mountView('/')
    return { w, router }
  }

  it('clicking folder ICON cell navigates to /folders/:id', async () => {
    const { w, router } = await setupWithFolders([makeFolder({ id: 'target-1', name: 'Clickme' })])

    // Column 1 (icon cell) — the amber div
    const iconCell = w.find('.bg-amber-50.rounded-lg')
    await iconCell.trigger('click')
    await flushPromises()

    expect(router.currentRoute.value.path).toBe('/folders/target-1')
  })

  it('clicking folder NAME text navigates to /folders/:id', async () => {
    // This tests the bug: @click.stop on the name wrapper div prevents navigation
    const { w, router } = await setupWithFolders([makeFolder({ id: 'target-1', name: 'Clickme' })])

    // Column 2 (name cell) — the span with the folder name
    const nameSpan = w.findAll('span').find(s => s.text() === 'Clickme')
    expect(nameSpan).toBeTruthy()
    await nameSpan.trigger('click')
    await flushPromises()

    expect(router.currentRoute.value.path).toBe('/folders/target-1')
  })

  it('clicking folder DATE cell navigates to /folders/:id', async () => {
    const { w, router } = await setupWithFolders([makeFolder({ id: 'target-1', name: 'Clickme' })])

    // find the date cells (text-gray-400 text-xs spans)
    const dateCells = w.findAll('.text-right.text-xs.text-gray-400')
    // Click the first date cell (the "—" size or actual date)
    if (dateCells.length > 0) {
      await dateCells[0].trigger('click')
      await flushPromises()
      expect(router.currentRoute.value.path).toBe('/folders/target-1')
    }
  })

  it('clicking rename button does NOT navigate', async () => {
    const { w, router } = await setupWithFolders([makeFolder({ id: 'target-1', name: 'Clickme' })])

    // Find rename button (pencil icon button in hover actions)
    const actionBtns = w.findAll('.opacity-0.group-hover\\:opacity-100 button')
    if (actionBtns.length > 0) {
      await actionBtns[0].trigger('click')
      await flushPromises()
      // Should still be at root
      expect(router.currentRoute.value.path).toBe('/')
    }
  })
})

describe('FileManagerView — subfolder creation does not break navigation', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    mockListDocuments.mockResolvedValue({ items: [], total: 0 })
    mockGetFolder.mockResolvedValue({
      id: 'parent-1', name: 'Test',
      breadcrumb: [{ id: 'parent-1', name: 'Test' }],
    })
  })

  it('after creating subfolder, clicking its name navigates correctly', async () => {
    const initialChildren = [makeFolder({ id: 'existing-1', name: 'Existing', parent_id: 'parent-1' })]
    mockListFolders.mockResolvedValue({ items: initialChildren })

    const newSubfolder = makeFolder({ id: 'new-sub', name: 'NewSub', parent_id: 'parent-1' })
    mockCreateFolder.mockResolvedValue(newSubfolder)

    const { w, router } = await mountView('/folders/parent-1')

    // Simulate creating a new subfolder (as if user typed in the new-folder input)
    const { useFoldersStore } = await import('../../stores/folders.js')
    const foldersStore = useFoldersStore()
    await foldersStore.createFolder('NewSub', 'parent-1')
    await flushPromises()

    // Now "NewSub" should appear in the list
    expect(w.text()).toContain('NewSub')

    // Clicking the name of "NewSub" should navigate — this is the regression test
    const nameSpan = w.findAll('span').find(s => s.text() === 'NewSub')
    expect(nameSpan).toBeTruthy()
    await nameSpan.trigger('click')
    await flushPromises()

    expect(router.currentRoute.value.path).toBe('/folders/new-sub')
  })

  it('after creating subfolder, clicking existing folder name still navigates', async () => {
    const initial = [makeFolder({ id: 'existing-1', name: 'Existing', parent_id: 'parent-1' })]
    mockListFolders.mockResolvedValue({ items: initial })
    mockCreateFolder.mockResolvedValue(
      makeFolder({ id: 'new-sub', name: 'NewSub', parent_id: 'parent-1' })
    )

    const { w, router } = await mountView('/folders/parent-1')

    const { useFoldersStore } = await import('../../stores/folders.js')
    await useFoldersStore().createFolder('NewSub', 'parent-1')
    await flushPromises()

    const nameSpan = w.findAll('span').find(s => s.text() === 'Existing')
    expect(nameSpan).toBeTruthy()
    await nameSpan.trigger('click')
    await flushPromises()

    expect(router.currentRoute.value.path).toBe('/folders/existing-1')
  })
})

describe('FileManagerView — drag-and-drop document onto folder', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    mockMoveDocument.mockResolvedValue({})
    mockListDocuments.mockResolvedValue({
      items: [makeDoc({ id: 'd1', original_name: 'doc.pdf' })],
      total: 1,
    })
    mockListFolders.mockResolvedValue({
      items: [makeFolder({ id: 'f-target', name: 'Target' })],
    })
    mockGetFolder.mockResolvedValue({
      id: 'parent-1', name: 'Parent',
      breadcrumb: [{ id: 'parent-1', name: 'Parent' }],
    })
  })

  it('dragstart on document row sets dragging state', async () => {
    const { w } = await mountView('/folders/parent-1')

    const docRow = w.findAll('[draggable="true"]')[0]
    expect(docRow).toBeTruthy()

    await docRow.trigger('dragstart', { dataTransfer: { effectAllowed: '', setData: vi.fn(), types: [] } })
    // The row gets opacity-50 when dragging
    await w.vm.$nextTick()
  })

  it('drop on folder row calls moveToFolder', async () => {
    const { w } = await mountView('/folders/parent-1')
    await flushPromises()

    // Start dragging doc
    const docRow = w.findAll('[draggable="true"]')[0]
    const dataTransfer = { effectAllowed: '', setData: vi.fn(), types: [] }
    await docRow.trigger('dragstart', { dataTransfer })
    await w.vm.$nextTick()

    // Find folder row and drop on it
    const folderRows = w.findAll('.grid.grid-cols-\\[2rem_1fr_6rem_8rem_6rem\\]').filter(
      el => el.text().includes('Target')
    )
    if (folderRows.length > 0) {
      await folderRows[0].trigger('drop', { dataTransfer: { types: [] } })
      await flushPromises()
      expect(mockMoveDocument).toHaveBeenCalled()
    }
  })
})

describe('FileManagerView — empty states', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    mockListFolders.mockResolvedValue({ items: [] })
    mockListDocuments.mockResolvedValue({ items: [], total: 0 })
    mockGetFolder.mockResolvedValue({ id: 'f1', name: 'Empty', breadcrumb: [] })
  })

  it('shows "No folders yet" when root has no folders', async () => {
    const { w } = await mountView('/')
    expect(w.text()).toContain('No folders yet')
  })

  it('shows "This folder is empty" inside an empty subfolder', async () => {
    const { w } = await mountView('/folders/f1')
    expect(w.text()).toContain('This folder is empty')
  })
})

describe('FileManagerView — new folder creation', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    mockListFolders.mockResolvedValue({ items: [] })
    mockListDocuments.mockResolvedValue({ items: [], total: 0 })
    mockGetFolder.mockResolvedValue({ id: 'f1', name: 'Test', breadcrumb: [] })
    mockCreateFolder.mockResolvedValue(makeFolder({ id: 'new-1', name: 'MyNewFolder' }))
  })

  it('clicking "New folder" button shows inline input', async () => {
    const { w } = await mountView('/')

    const newBtn = w.find('button.flex.items-center.gap-1\\.5')
    await newBtn.trigger('click')
    await w.vm.$nextTick()

    expect(w.find('input[placeholder="Folder name"]').exists()).toBe(true)
  })

  it('pressing Enter in folder name input creates folder at current level', async () => {
    const { w } = await mountView('/folders/f1')

    // Open new folder input
    await w.find('button.flex.items-center.gap-1\\.5').trigger('click')
    await w.vm.$nextTick()

    // Type folder name and submit
    const input = w.find('input[placeholder="Folder name"]')
    await input.setValue('MyNewFolder')
    await input.trigger('keydown.enter')
    await flushPromises()

    expect(mockCreateFolder).toHaveBeenCalledWith('MyNewFolder', 'f1')
  })

  it('pressing Escape cancels folder creation', async () => {
    const { w } = await mountView('/')

    await w.find('button.flex.items-center.gap-1\\.5').trigger('click')
    await w.vm.$nextTick()

    await w.find('input[placeholder="Folder name"]').trigger('keydown.escape')
    await w.vm.$nextTick()

    expect(w.find('input[placeholder="Folder name"]').exists()).toBe(false)
  })
})