import { act, cleanup, fireEvent, render, screen, waitFor } from '@testing-library/react'
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
import '@testing-library/jest-dom'

const startDraggingMock = vi.hoisted(() => vi.fn(() => Promise.resolve()))
const getCurrentWindowMock = vi.hoisted(() => vi.fn(() => ({
  startDragging: startDraggingMock,
})))
const windowControlsMock = vi.hoisted(() => ({
  show: true,
}))

vi.mock('@tauri-apps/api/window', () => ({
  getCurrentWindow: getCurrentWindowMock,
}))

vi.mock('../../i18n', () => ({
  useTranslation: () => (key: string) => {
    const translations: Record<string, string> = {
      'tabs.close': 'Close',
      'tabs.closeOthers': 'Close Others',
      'tabs.closeLeft': 'Close Left',
      'tabs.closeRight': 'Close Right',
      'tabs.closeAll': 'Close All',
      'tabs.closeConfirmTitle': 'Session Running',
      'tabs.closeConfirmMessage': 'Still running',
      'tabs.closeConfirmKeep': 'Keep Running',
      'tabs.closeConfirmStop': 'Stop & Close',
      'tabs.openTerminal': 'Open Terminal',
      'tabs.showWorkspace': 'Show Workspace',
      'tabs.hideWorkspace': 'Hide Workspace',
      'common.cancel': 'Cancel',
    }

    return translations[key] ?? key
  },
}))

vi.mock('./WindowControls', () => ({
  WindowControls: () => (windowControlsMock.show ? <div data-testid="window-controls" /> : null),
  get showWindowControls() {
    return windowControlsMock.show
  },
}))

describe('TabBar', () => {
  beforeEach(() => {
    class ResizeObserverMock {
      constructor(_callback: ResizeObserverCallback) {}

      observe(_target: Element) {}

      disconnect() {}
      unobserve() {}
    }

    Object.defineProperty(window, 'ResizeObserver', {
      configurable: true,
      value: ResizeObserverMock,
    })

    Object.defineProperty(window, '__TAURI__', {
      configurable: true,
      value: {},
    })

    startDraggingMock.mockClear()
    getCurrentWindowMock.mockClear()
    windowControlsMock.show = true
    vi.resetModules()
  })

  afterEach(async () => {
    cleanup()

    const { useTabStore } = await import('../../stores/tabStore')
    const { useChatStore } = await import('../../stores/chatStore')
    const { useWorkspacePanelStore } = await import('../../stores/workspacePanelStore')
    const { useTerminalPanelStore } = await import('../../stores/terminalPanelStore')

    useTabStore.setState({ tabs: [], activeTabId: null })
    useChatStore.setState({
      sessions: {},
    } as Partial<ReturnType<typeof useChatStore.getState>>)
    useWorkspacePanelStore.setState(useWorkspacePanelStore.getInitialState(), true)
    useTerminalPanelStore.setState(useTerminalPanelStore.getInitialState(), true)

    delete (window as typeof window & { __TAURI__?: unknown }).__TAURI__
  })

  it('keeps the overflow button flush against window controls on Windows', async () => {
    const { TabBar } = await import('./TabBar')
    const { useTabStore } = await import('../../stores/tabStore')
    const { useChatStore } = await import('../../stores/chatStore')

    useTabStore.setState({
      tabs: [
        { sessionId: 'tab-1', title: 'Untitled Session', type: 'session', status: 'idle' },
        { sessionId: 'tab-2', title: 'Settings', type: 'settings', status: 'idle' },
        { sessionId: 'tab-3', title: 'hello', type: 'session', status: 'idle' },
        { sessionId: 'tab-4', title: 'overflow', type: 'session', status: 'idle' },
      ],
      activeTabId: 'tab-1',
    })
    useChatStore.setState({
      sessions: {},
      disconnectSession: vi.fn(),
    } as Partial<ReturnType<typeof useChatStore.getState>>)

    await act(async () => {
      render(<TabBar />)
    })

    const scrollRegion = screen.getByTestId('tab-bar').querySelector('.overflow-x-hidden')
    expect(scrollRegion).toBeInTheDocument()

    Object.defineProperty(scrollRegion!, 'clientWidth', {
      configurable: true,
      get: () => 240,
    })
    Object.defineProperty(scrollRegion!, 'scrollWidth', {
      configurable: true,
      get: () => 720,
    })
    Object.defineProperty(scrollRegion!, 'scrollLeft', {
      configurable: true,
      get: () => 0,
    })
    Object.defineProperty(scrollRegion!, 'scrollBy', {
      configurable: true,
      value: vi.fn(),
    })

    act(() => {
      fireEvent.scroll(scrollRegion!)
    })

    await waitFor(() => {
      expect(screen.getByTestId('window-controls')).toBeInTheDocument()
      expect(screen.getByText('chevron_right').closest('button')).toBeInTheDocument()
    })

    const rightButton = screen.getByText('chevron_right').closest('button')
    expect(rightButton?.nextElementSibling).toBe(screen.getByTestId('window-controls'))
  })

  it('shows the terminal toolbar when no tabs are open', async () => {
    windowControlsMock.show = false
    const { TabBar } = await import('./TabBar')
    const { useTabStore } = await import('../../stores/tabStore')

    useTabStore.setState({ tabs: [], activeTabId: null })

    await act(async () => {
      render(<TabBar />)
    })

    fireEvent.click(screen.getByRole('button', { name: 'Open Terminal' }))

    const terminalTabs = useTabStore.getState().tabs.filter((tab) => tab.type === 'terminal')
    expect(terminalTabs).toHaveLength(1)
    expect(useTabStore.getState().activeTabId).toBe(terminalTabs[0]?.sessionId)
    expect(screen.queryByTestId('window-controls')).not.toBeInTheDocument()
  })

  it('marks the tab bar as a native drag region', async () => {
    const { TabBar } = await import('./TabBar')
    const { useTabStore } = await import('../../stores/tabStore')
    const { useChatStore } = await import('../../stores/chatStore')

    useTabStore.setState({
      tabs: [
        { sessionId: 'tab-1', title: 'Untitled Session', type: 'session', status: 'idle' },
      ],
      activeTabId: 'tab-1',
    })
    useChatStore.setState({
      sessions: {},
      disconnectSession: vi.fn(),
    } as Partial<ReturnType<typeof useChatStore.getState>>)

    await act(async () => {
      render(<TabBar />)
    })

    expect(screen.getByTestId('tab-bar')).not.toHaveAttribute('data-tauri-drag-region')
    expect(screen.getByTestId('tab-bar-drag-gutter')).toHaveAttribute('data-tauri-drag-region')
  })

  it('starts dragging when clicking the empty tab-bar gutter', async () => {
    const { TabBar } = await import('./TabBar')
    const { useTabStore } = await import('../../stores/tabStore')
    const { useChatStore } = await import('../../stores/chatStore')

    useTabStore.setState({
      tabs: [
        { sessionId: 'tab-1', title: 'Untitled Session', type: 'session', status: 'idle' },
      ],
      activeTabId: 'tab-1',
    })
    useChatStore.setState({
      sessions: {},
      disconnectSession: vi.fn(),
    } as Partial<ReturnType<typeof useChatStore.getState>>)

    await act(async () => {
      render(<TabBar />)
    })

    await waitFor(() => {
      expect(getCurrentWindowMock).toHaveBeenCalled()
    })

    const scrollRegion = screen.getByTestId('tab-bar').querySelector('.overflow-x-hidden')
    expect(scrollRegion).toBeInTheDocument()

    fireEvent.mouseDown(scrollRegion!)

    await waitFor(() => {
      expect(startDraggingMock).toHaveBeenCalledTimes(1)
    })
  })

  it('does not start dragging when clicking a tab', async () => {
    const { TabBar } = await import('./TabBar')
    const { useTabStore } = await import('../../stores/tabStore')
    const { useChatStore } = await import('../../stores/chatStore')

    useTabStore.setState({
      tabs: [
        { sessionId: 'tab-1', title: 'Untitled Session', type: 'session', status: 'idle' },
      ],
      activeTabId: 'tab-1',
    })
    useChatStore.setState({
      sessions: {},
      disconnectSession: vi.fn(),
    } as Partial<ReturnType<typeof useChatStore.getState>>)

    await act(async () => {
      render(<TabBar />)
    })

    await waitFor(() => {
      expect(getCurrentWindowMock).toHaveBeenCalled()
    })

    fireEvent.mouseDown(screen.getByText('Untitled Session'))

    expect(startDraggingMock).not.toHaveBeenCalled()
  })

  it('reorders tabs via pointer drag', async () => {
    const { TabBar } = await import('./TabBar')
    const { useTabStore } = await import('../../stores/tabStore')
    const { useChatStore } = await import('../../stores/chatStore')

    useTabStore.setState({
      tabs: [
        { sessionId: 'tab-1', title: 'First Session', type: 'session', status: 'idle' },
        { sessionId: 'tab-2', title: 'Second Session', type: 'session', status: 'idle' },
      ],
      activeTabId: 'tab-1',
    })
    useChatStore.setState({
      sessions: {},
      disconnectSession: vi.fn(),
    } as Partial<ReturnType<typeof useChatStore.getState>>)

    await act(async () => {
      render(<TabBar />)
    })

    expect(screen.getByTestId('tab-bar').querySelector('.tab-bar-hit-area')).toBeInTheDocument()

    const firstTab = screen.getByText('First Session').closest('.tab-bar-hit-area')
    const secondTab = screen.getByText('Second Session').closest('.tab-bar-hit-area')

    expect(firstTab).toBeTruthy()
    expect(secondTab).toBeTruthy()

    Object.defineProperty(firstTab!, 'getBoundingClientRect', {
      configurable: true,
      value: () => ({ left: 0, width: 180 }),
    })
    Object.defineProperty(secondTab!, 'getBoundingClientRect', {
      configurable: true,
      value: () => ({ left: 180, width: 180 }),
    })

    fireEvent.mouseDown(firstTab!, { button: 0, clientX: 20, clientY: 10 })
    fireEvent.mouseMove(window, { clientX: 260, clientY: 10 })

    expect(firstTab).toHaveAttribute('data-dragging', 'true')

    fireEvent.mouseUp(window)

    expect(useTabStore.getState().tabs.map((tab) => tab.sessionId)).toEqual(['tab-2', 'tab-1'])
  })

  it('does not reorder on a simple click without dragging', async () => {
    const { TabBar } = await import('./TabBar')
    const { useTabStore } = await import('../../stores/tabStore')
    const { useChatStore } = await import('../../stores/chatStore')

    useTabStore.setState({
      tabs: [
        { sessionId: 'tab-1', title: 'First Session', type: 'session', status: 'idle' },
        { sessionId: 'tab-2', title: 'Second Session', type: 'session', status: 'idle' },
      ],
      activeTabId: 'tab-1',
    })
    useChatStore.setState({
      sessions: {},
      disconnectSession: vi.fn(),
    } as Partial<ReturnType<typeof useChatStore.getState>>)

    await act(async () => {
      render(<TabBar />)
    })

    const firstTab = screen.getByText('First Session').closest('.tab-bar-hit-area')
    expect(firstTab).toBeTruthy()

    fireEvent.mouseDown(firstTab!, { button: 0, clientX: 20, clientY: 10 })
    fireEvent.mouseUp(window)
    fireEvent.click(firstTab!)

    expect(useTabStore.getState().tabs.map((tab) => tab.sessionId)).toEqual(['tab-1', 'tab-2'])
    expect(useTabStore.getState().activeTabId).toBe('tab-1')
  })

  it('closes a tab from the close button without activating drag behavior', async () => {
    const { TabBar } = await import('./TabBar')
    const { useTabStore } = await import('../../stores/tabStore')
    const { useChatStore } = await import('../../stores/chatStore')

    const disconnectSession = vi.fn()

    useTabStore.setState({
      tabs: [
        { sessionId: 'tab-1', title: 'First Session', type: 'session', status: 'idle' },
        { sessionId: 'tab-2', title: 'Second Session', type: 'session', status: 'idle' },
      ],
      activeTabId: 'tab-2',
    })
    useChatStore.setState({
      sessions: {},
      disconnectSession,
    } as Partial<ReturnType<typeof useChatStore.getState>>)

    await act(async () => {
      render(<TabBar />)
    })

    const firstTab = screen.getByText('First Session').closest('.tab-bar-hit-area')
    const closeButton = screen.getByLabelText('Close First Session')

    expect(firstTab).toHaveClass('group')

    fireEvent.mouseDown(closeButton, { button: 0, clientX: 20, clientY: 10 })
    fireEvent.click(closeButton)
    fireEvent.mouseMove(window, { clientX: 260, clientY: 10 })
    fireEvent.mouseUp(window)

    expect(disconnectSession).toHaveBeenCalledWith('tab-1')
    expect(useTabStore.getState().tabs.map((tab) => tab.sessionId)).toEqual(['tab-2'])
    expect(useTabStore.getState().activeTabId).toBe('tab-2')
  })

  it('closes terminal tabs without disconnecting chat sessions', async () => {
    const { TabBar } = await import('./TabBar')
    const { useTabStore } = await import('../../stores/tabStore')
    const { useChatStore } = await import('../../stores/chatStore')

    const disconnectSession = vi.fn()

    useTabStore.setState({
      tabs: [
        { sessionId: '__terminal__1', title: 'Terminal 1', type: 'terminal', status: 'idle' },
      ],
      activeTabId: '__terminal__1',
    })
    useChatStore.setState({
      sessions: {},
      disconnectSession,
    } as Partial<ReturnType<typeof useChatStore.getState>>)

    await act(async () => {
      render(<TabBar />)
    })

    expect(screen.getByLabelText('Open Terminal')).toBeInTheDocument()

    fireEvent.click(screen.getByLabelText('Close Terminal 1'))

    expect(disconnectSession).not.toHaveBeenCalled()
    expect(useTabStore.getState().tabs).toEqual([])
  })

  it('opens the bottom terminal panel from the toolbar for an active session', async () => {
    const { TabBar } = await import('./TabBar')
    const { useTabStore } = await import('../../stores/tabStore')
    const { useChatStore } = await import('../../stores/chatStore')
    const { useTerminalPanelStore } = await import('../../stores/terminalPanelStore')

    useTabStore.setState({
      tabs: [
        { sessionId: 'tab-1', title: 'First Session', type: 'session', status: 'idle' },
      ],
      activeTabId: 'tab-1',
    })
    useChatStore.setState({
      sessions: {},
      disconnectSession: vi.fn(),
    } as Partial<ReturnType<typeof useChatStore.getState>>)

    await act(async () => {
      render(<TabBar />)
    })

    fireEvent.click(screen.getByRole('button', { name: 'Open Terminal' }))

    const terminalTabs = useTabStore.getState().tabs.filter((tab) => tab.type === 'terminal')
    expect(terminalTabs).toHaveLength(0)
    expect(useTerminalPanelStore.getState().isPanelOpen('tab-1')).toBe(true)
  })

  it('treats legacy session tabs without a type as bottom-panel terminal targets', async () => {
    const { TabBar } = await import('./TabBar')
    const { useTabStore } = await import('../../stores/tabStore')
    const { useChatStore } = await import('../../stores/chatStore')
    const { useTerminalPanelStore } = await import('../../stores/terminalPanelStore')

    useTabStore.setState({
      tabs: [
        { sessionId: 'legacy-session', title: 'Legacy Session', status: 'idle' } as ReturnType<typeof useTabStore.getState>['tabs'][number],
      ],
      activeTabId: 'legacy-session',
    })
    useChatStore.setState({
      sessions: {},
      disconnectSession: vi.fn(),
    } as Partial<ReturnType<typeof useChatStore.getState>>)

    await act(async () => {
      render(<TabBar />)
    })

    fireEvent.click(screen.getByRole('button', { name: 'Open Terminal' }))

    expect(useTabStore.getState().tabs.some((tab) => tab.type === 'terminal')).toBe(false)
    expect(useTerminalPanelStore.getState().isPanelOpen('legacy-session')).toBe(true)
  })

  it('toggles the workspace panel for the active session from the toolbar', async () => {
    const { TabBar } = await import('./TabBar')
    const { useTabStore } = await import('../../stores/tabStore')
    const { useChatStore } = await import('../../stores/chatStore')
    const { useWorkspacePanelStore } = await import('../../stores/workspacePanelStore')

    useTabStore.setState({
      tabs: [
        { sessionId: 'tab-1', title: 'First Session', type: 'session', status: 'idle' },
      ],
      activeTabId: 'tab-1',
    })
    useChatStore.setState({
      sessions: {},
      disconnectSession: vi.fn(),
    } as Partial<ReturnType<typeof useChatStore.getState>>)

    await act(async () => {
      render(<TabBar />)
    })

    fireEvent.click(screen.getByRole('button', { name: 'Show Workspace' }))
    expect(useWorkspacePanelStore.getState().isPanelOpen('tab-1')).toBe(true)

    fireEvent.click(screen.getByRole('button', { name: 'Hide Workspace' }))
    expect(useWorkspacePanelStore.getState().isPanelOpen('tab-1')).toBe(false)
  })

  it('hides the workspace toolbar button for non-session tabs', async () => {
    const { TabBar } = await import('./TabBar')
    const { useTabStore } = await import('../../stores/tabStore')
    const { useChatStore } = await import('../../stores/chatStore')

    useTabStore.setState({
      tabs: [
        { sessionId: '__terminal__1', title: 'Terminal 1', type: 'terminal', status: 'idle' },
        { sessionId: '__settings__', title: 'Settings', type: 'settings', status: 'idle' },
      ],
      activeTabId: '__terminal__1',
    })
    useChatStore.setState({
      sessions: {},
      disconnectSession: vi.fn(),
    } as Partial<ReturnType<typeof useChatStore.getState>>)

    const { rerender } = render(<TabBar />)

    expect(screen.queryByRole('button', { name: 'Show Workspace' })).not.toBeInTheDocument()

    await act(async () => {
      useTabStore.getState().setActiveTab('__settings__')
    })
    rerender(<TabBar />)

    expect(screen.queryByRole('button', { name: 'Show Workspace' })).not.toBeInTheDocument()
  })

  it('clears session panel state when closing a session tab', async () => {
    const { TabBar } = await import('./TabBar')
    const { useTabStore } = await import('../../stores/tabStore')
    const { useChatStore } = await import('../../stores/chatStore')
    const { useWorkspacePanelStore } = await import('../../stores/workspacePanelStore')
    const { useTerminalPanelStore } = await import('../../stores/terminalPanelStore')

    useTabStore.setState({
      tabs: [
        { sessionId: 'tab-1', title: 'First Session', type: 'session', status: 'idle' },
      ],
      activeTabId: 'tab-1',
    })
    useChatStore.setState({
      sessions: {},
      disconnectSession: vi.fn(),
    } as Partial<ReturnType<typeof useChatStore.getState>>)
    useWorkspacePanelStore.getState().openPanel('tab-1')
    useTerminalPanelStore.getState().openPanel('tab-1')

    await act(async () => {
      render(<TabBar />)
    })

    fireEvent.click(screen.getByLabelText('Close First Session'))

    expect(useWorkspacePanelStore.getState().panelBySession['tab-1']).toBeUndefined()
    expect(useTerminalPanelStore.getState().panelBySession['tab-1']).toBeUndefined()
  })
})