import { fireEvent, render, screen, within } from '@testing-library/react'
import userEvent from '@testing-library/user-event'
import { beforeEach, describe, expect, it, vi } from 'vitest'
import Sidebar from '../../src/components/layout/Sidebar'
import { useSessionStore, type Session } from '../../src/stores/sessionStore'
import { useTabStore } from '../../src/stores/tabStore'
import { unlockProForTests } from '../helpers/entitlement'
import { mockDesktopApi } from '../setup'

function makeSession(overrides: Partial<Session> & Pick<Session, 'id' | 'name'>): Session {
  return {
    host: `${overrides.id}.example.com`,
    port: 22,
    username: 'root',
    authType: 'key',
    ...overrides,
  }
}

function rowOf(name: string): HTMLElement {
  const row = screen.getByText(name).closest('[data-session-row]')
  if (!row) throw new Error(`session row not found: ${name}`)
  return row as HTMLElement
}

function mockElementFromPoint(target: Element) {
  const original = document.elementFromPoint
  Object.defineProperty(document, 'elementFromPoint', {
    configurable: true,
    value: vi.fn(() => target),
  })
  return () => {
    Object.defineProperty(document, 'elementFromPoint', {
      configurable: true,
      value: original,
    })
  }
}

/** Pointer-drag a session row onto `dropOn` (WKWebView-safe path, not HTML5 DnD). */
function pointerDrag(fromName: string, dropOn: Element) {
  const source = rowOf(fromName)
  const restore = mockElementFromPoint(dropOn)
  fireEvent.pointerDown(source, { button: 0, pointerId: 1, clientX: 10, clientY: 10 })
  fireEvent.pointerMove(source, { pointerId: 1, clientX: 30, clientY: 40 })
  fireEvent.pointerUp(source, { button: 0, pointerId: 1, clientX: 30, clientY: 40 })
  restore()
}

describe('sidebar session manual order', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    unlockProForTests()
    window.opsxApi = mockDesktopApi
    useSessionStore.setState({ sessions: [] })
    useTabStore.setState({
      tabs: [{ id: 'welcome', title: '欢迎', type: 'welcome', isActive: true }],
      activeTabId: 'welcome',
    })
  })

  function loadSessions(sessions: Session[]) {
    vi.mocked(mockDesktopApi.sessionGetAll).mockResolvedValueOnce({ success: true, sessions })
  }

  function renderSidebar() {
    render(<Sidebar onNewSession={vi.fn()} onQuickConnect={vi.fn()} onEditSession={vi.fn()} />)
  }

  it('renders groups in manual order with legacy rows kept after ordered ones', async () => {
    loadSessions([
      makeSession({ id: 'pre-jenkins', name: 'pre-jenkins', sortOrder: 2 }),
      makeSession({ id: 'pre-monitor', name: 'pre-monitor', sortOrder: 0 }),
      makeSession({ id: 'legacy-host', name: 'legacy-host' }),
    ])
    renderSidebar()

    await screen.findByText('pre-monitor')
    const group = document.getElementById('session-group-default')!
    const names = within(group)
      .getAllByText(/pre-jenkins|pre-monitor|legacy-host/)
      .map((node) => node.textContent)
    expect(names).toEqual(['pre-monitor', 'pre-jenkins', 'legacy-host'])
  })

  it('persists a within-group drag as one batch reorder', async () => {
    loadSessions([
      makeSession({ id: 'a', name: 'alpha', sortOrder: 0 }),
      makeSession({ id: 'b', name: 'bravo', sortOrder: 1 }),
      makeSession({ id: 'c', name: 'charlie', sortOrder: 2 }),
    ])
    renderSidebar()
    await screen.findByText('alpha')

    // jsdom rows report a zero rect, so a drop resolves to "insert after".
    pointerDrag('charlie', rowOf('alpha'))

    await vi.waitFor(() => {
      expect(mockDesktopApi.sessionReorder).toHaveBeenCalledWith([
        { id: 'a', sortOrder: 0 },
        { id: 'c', sortOrder: 1 },
        { id: 'b', sortOrder: 2 },
      ])
    })
    // The store keeps its element order; the persisted sortOrders define display order.
    const order = new Map(useSessionStore.getState().sessions.map((session) => [session.id, session.sortOrder]))
    expect(order.get('a')).toBe(0)
    expect(order.get('c')).toBe(1)
    expect(order.get('b')).toBe(2)
  })

  it('moves a session into another group via its header', async () => {
    loadSessions([
      makeSession({ id: 'a', name: 'alpha', sortOrder: 0 }),
      makeSession({ id: 'b', name: 'bravo', sortOrder: 1, group: 'prod' }),
    ])
    renderSidebar()
    await screen.findByText('alpha')

    pointerDrag('alpha', screen.getByText('prod'))

    await vi.waitFor(() => {
      expect(mockDesktopApi.sessionReorder).toHaveBeenCalledWith([
        { id: 'b', sortOrder: 0 },
        { id: 'a', sortOrder: 1, group: 'prod' },
      ])
    })
    expect(useSessionStore.getState().sessions.find((session) => session.id === 'a')?.group).toBe('prod')
  })

  it('inserts a session among hosts already in another group', async () => {
    loadSessions([
      makeSession({ id: 'a', name: 'alpha', sortOrder: 0 }),
      makeSession({ id: 'b', name: 'bravo', sortOrder: 0, group: 'test' }),
      makeSession({ id: 'c', name: 'charlie', sortOrder: 1, group: 'test' }),
    ])
    renderSidebar()
    await screen.findByText('alpha')
    fireEvent.click(screen.getByText('test'))
    await screen.findByText('bravo')

    pointerDrag('alpha', rowOf('bravo'))

    await vi.waitFor(() => {
      expect(mockDesktopApi.sessionReorder).toHaveBeenCalledWith([
        { id: 'b', sortOrder: 0 },
        { id: 'a', sortOrder: 1, group: 'test' },
        { id: 'c', sortOrder: 2 },
      ])
    })
    expect(useSessionStore.getState().sessions.find((session) => session.id === 'a')?.group).toBe('test')
  })

  it('sorts a group by name from the group context menu', async () => {
    const user = userEvent.setup()
    loadSessions([
      makeSession({ id: 'b', name: 'bravo' }),
      makeSession({ id: 'g', name: 'gamma' }),
      makeSession({ id: 'a', name: 'alpha' }),
    ])
    renderSidebar()
    await screen.findByText('bravo')

    await user.pointer([{ keys: '[MouseRight>]', target: screen.getByText('默认分组') }, { keys: '[/MouseRight]' }])
    await user.click(screen.getByRole('button', { name: '按名称排序' }))

    await vi.waitFor(() => {
      expect(mockDesktopApi.sessionReorder).toHaveBeenCalledWith([
        { id: 'a', sortOrder: 0 },
        { id: 'b', sortOrder: 1 },
        { id: 'g', sortOrder: 2 },
      ])
    })
  })

  it('skips the reorder write when the drop changes nothing', async () => {
    loadSessions([
      makeSession({ id: 'a', name: 'alpha', sortOrder: 0 }),
      makeSession({ id: 'b', name: 'bravo', sortOrder: 1 }),
    ])
    renderSidebar()
    await screen.findByText('alpha')

    // Dropping bravo after itself-equivalent position (after bravo) is a no-op.
    pointerDrag('bravo', rowOf('bravo'))

    await Promise.resolve()
    expect(mockDesktopApi.sessionReorder).not.toHaveBeenCalled()
  })
})