// @vitest-environment jsdom
//
// A removed line owns no line in Actual, so it cannot carry a band. It leaves a
// rule on the edge of the line that took its place instead. The mock project has
// no such change, so this drives the renderer with a git payload of its own.
import { afterEach, beforeAll, beforeEach, describe, expect, it, vi } from 'vitest'
import { cleanup, fireEvent, render, waitFor } from '@testing-library/react'
import React from 'react'

vi.mock('../src/renderer/src/terminals', () => {
  let n = 0
  return { Terminal: () => null, lid: () => ++n }
})

import { App } from '../src/renderer/src/App'
import { ProjectProvider } from '../src/renderer/src/project'
import { installBridge, removeBridge } from './stub-bridge'

const HEAD = 'keep\ngone\ntail\n'
const DISK = 'keep\ntail\n'

beforeAll(() => {
  globalThis.ResizeObserver = class { observe(): void {} unobserve(): void {} disconnect(): void {} } as never
  if (!Element.prototype.scrollIntoView) Element.prototype.scrollIntoView = (): void => {}
})
beforeEach(() => {
  installBridge([{ path: 'demo.txt', status: 'M', staged: false, original: HEAD, updated: DISK }], { 'demo.txt': DISK })
})
afterEach(() => {
  cleanup()
  localStorage.clear()
  removeBridge()
})

async function openRow(): Promise<HTMLElement> {
  const c = render(<ProjectProvider><App /></ProjectProvider>).container
  const row = await waitFor(() => {
    const r = c.querySelector<HTMLElement>('.git-row')
    if (!r) throw new Error('git not ready')
    return r
  })
  fireEvent.click(row)
  await waitFor(() => expect(c.querySelector('.code-edit')).toBeTruthy())
  return c
}

describe('a change that only removes a line', () => {
  it('rules the edge of the line below it, and tints nothing', async () => {
    const c = await openRow()
    await waitFor(() => expect(c.querySelectorAll('.ce-gaprule')).toHaveLength(1))
    expect(c.querySelector('.ce-band')).toBeNull()
    expect(c.querySelector('.ce-gutter .chg')).toBeNull()
  })

  it('hands the removed line to the hover panel', async () => {
    const c = await openRow()
    const scroll = await waitFor(() => {
      const el = c.querySelector<HTMLElement>('.ce-scroll')
      if (!el || !c.querySelector('.ce-gaprule')) throw new Error('rule not ready')
      return el
    })
    // 'tail' took the place of the removed line, and sits on line 2.
    fireEvent.mouseMove(scroll, { clientY: 10 + 20 + 5 })
    const peek = await waitFor(() => {
      const p = c.querySelector<HTMLElement>('.peek')
      if (!p) throw new Error('peek not ready')
      return p
    })
    expect(Array.from(peek.querySelectorAll('.ln-row.del')).map((el) => el.textContent?.replace(/^\d+/, ''))).toEqual(['gone'])
  })
})