import { afterEach, describe, expect, it, vi } from 'vitest'
import {
  TableHandlesExtension,
  TableHandlesView,
} from '../../node_modules/@blocknote/core/src/extensions/TableHandles/TableHandles'

function createTableBlock() {
  return {
    id: 'table-block',
    type: 'table',
    content: {
      type: 'tableContent',
      rows: [
        { cells: ['Head 1', 'Head 2'] },
        { cells: ['A', 'B'] },
      ],
    },
  }
}

function mountTableHandlesExtension() {
  const editorRoot = document.createElement('div')
  document.body.appendChild(editorRoot)

  const editor = {
    headless: true,
    isEditable: true,
    prosemirrorView: {
      root: document,
    },
    transact: vi.fn(),
  }

  const extension = TableHandlesExtension()({ editor: editor as never })
  const plugin = extension.prosemirrorPlugins?.[0]

  if (!plugin?.spec.view) {
    throw new Error('TableHandlesExtension did not register a plugin view')
  }

  const view = plugin.spec.view({
    dom: editorRoot,
    root: document,
  } as never) as TableHandlesView

  return { editor, extension, view }
}

describe('BlockNote table handles regression', () => {
  afterEach(() => {
    document.body.innerHTML = ''
  })

  it('hides stale table handles instead of throwing when tbody is missing during update', () => {
    const block = createTableBlock()
    const editorRoot = document.createElement('div')
    document.body.appendChild(editorRoot)

    const editor = {
      getBlock: vi.fn(() => block),
    }
    const emitUpdate = vi.fn()

    const view = new TableHandlesView(
      editor as never,
      {
        dom: editorRoot,
        root: document,
      } as never,
      emitUpdate,
    )

    view.state = {
      block,
      show: true,
      showAddOrRemoveRowsButton: true,
      showAddOrRemoveColumnsButton: true,
      rowIndex: 0,
      colIndex: 0,
    } as never

    const staleTableWrapper = document.createElement('div')
    editorRoot.appendChild(staleTableWrapper)
    view.tableElement = staleTableWrapper

    expect(() => view.update()).not.toThrow()
    expect(view.state?.show).toBe(false)
    expect(view.state?.showAddOrRemoveRowsButton).toBe(false)
    expect(view.state?.showAddOrRemoveColumnsButton).toBe(false)
    expect(emitUpdate).toHaveBeenCalled()

    view.destroy()
  })

  it('ignores stale table drag starts instead of throwing when hover state is unavailable', () => {
    const { editor, extension, view } = mountTableHandlesExtension()

    expect(() =>
      extension.colDragStart({ dataTransfer: null, clientX: 10 }),
    ).not.toThrow()
    expect(() =>
      extension.rowDragStart({ dataTransfer: null, clientY: 10 }),
    ).not.toThrow()
    expect(editor.transact).not.toHaveBeenCalled()

    view.destroy()
  })

  it('ignores stale table drag end events instead of throwing after state disappears', () => {
    const { extension, view } = mountTableHandlesExtension()

    expect(() => extension.dragEnd()).not.toThrow()

    view.destroy()
  })

  it('cancels stale table drops instead of throwing when no hovered row or column is available', () => {
    const block = createTableBlock()
    const editorRoot = document.createElement('div')
    document.body.appendChild(editorRoot)

    const editor = {
      getBlock: vi.fn(() => block),
    }
    const emitUpdate = vi.fn()

    const view = new TableHandlesView(
      editor as never,
      {
        dom: editorRoot,
        root: document,
      } as never,
      emitUpdate,
    )

    view.state = {
      block,
      show: true,
      showAddOrRemoveRowsButton: true,
      showAddOrRemoveColumnsButton: true,
      referencePosTable: {
        left: 0,
        top: 0,
        right: 100,
        bottom: 100,
      },
      rowIndex: undefined,
      colIndex: undefined,
      draggingState: {
        draggedCellOrientation: 'row',
        originalIndex: 0,
        mousePos: 10,
      },
      widgetContainer: undefined,
    } as never

    const dropEvent = {
      preventDefault: vi.fn(),
    }

    expect(() => view.dropHandler(dropEvent as never)).not.toThrow()
    expect(dropEvent.preventDefault).toHaveBeenCalled()
    expect(view.state?.draggingState).toBeUndefined()
    expect(view.state?.show).toBe(false)
    expect(view.state?.rowIndex).toBeUndefined()
    expect(view.state?.colIndex).toBeUndefined()
    expect(emitUpdate).toHaveBeenCalled()

    view.destroy()
  })
})