import { expect, test, type Locator, type Page } from '@playwright/test'

async function dragBy(page: Page, locator: Locator, deltaX: number, deltaY: number) {
  const box = await locator.boundingBox()
  if (!box) throw new Error('Drag target is not visible')
  const start = { x: box.x + Math.min(30, box.width / 3), y: box.y + Math.min(14, box.height / 4) }
  await page.mouse.move(start.x, start.y)
  await page.mouse.down()
  await page.mouse.move(start.x + deltaX / 2, start.y + deltaY / 2, { steps: 3 })
  await page.mouse.move(start.x + deltaX, start.y + deltaY, { steps: 3 })
  await page.mouse.up()
}

async function boardPosition(locator: Locator) {
  return locator.evaluate(element => ({
    left: Number.parseFloat((element as HTMLElement).style.left),
    top: Number.parseFloat((element as HTMLElement).style.top),
  }))
}

async function waitForSave(page: Page, action: () => Promise<void>) {
  const response = page.waitForResponse(candidate => candidate.request().method() === 'PUT' && candidate.url().includes('/api/levels/') && candidate.ok())
  await action()
  await response
}

test('move, folder expansion, hand pan, pinch zoom, and reload persistence', async ({ page }) => {
  await page.goto('/?level=e2e-level&edit=1')
  await expect(page.getByRole('heading', { name: 'Browser Safety Test' })).toBeVisible()

  const folder = page.locator('[data-temporal-id="widget:11111111-1111-4111-8111-111111111111"]')
  const file = page.locator('[data-temporal-id="file:contains:11111111-1111-4111-8111-111111111111:22222222-2222-4222-8222-222222222222"]')
  const board = page.locator('.board')
  const boardViewport = page.locator('.board-viewport')
  const containmentBand = page.locator('.folder-bands line')
  await expect(folder).toBeVisible()
  await expect(containmentBand).toHaveClass(/\bclosed\b/)
  const folderBefore = await boardPosition(folder)

  await waitForSave(page, () => dragBy(page, folder, 70, 42))
  const movedFolder = await boardPosition(folder)
  expect(movedFolder.left).toBeGreaterThan(folderBefore.left)
  expect(movedFolder.top).toBeGreaterThan(folderBefore.top)

  await page.reload()
  await expect(folder).toBeVisible()
  expect(await boardPosition(folder)).toEqual(movedFolder)

  await waitForSave(page, () => folder.getByRole('button', { name: 'OPEN', exact: true }).click())
  await expect(file).toHaveClass(/\bopen\b/)
  await expect(containmentBand).toHaveClass(/\bopen\b/)
  const fileBefore = await boardPosition(file)
  await waitForSave(page, () => dragBy(page, file, 56, 35))
  const movedFile = await boardPosition(file)
  expect(movedFile.left).toBeGreaterThan(fileBefore.left)
  expect(movedFile.top).toBeGreaterThan(fileBefore.top)

  await page.reload()
  await expect(file).toHaveClass(/\bopen\b/)
  expect(await boardPosition(file)).toEqual(movedFile)

  const folderBeforePan = await boardPosition(folder)
  const transformBeforePan = await board.getAttribute('style')
  await page.getByRole('button', { name: 'HAND', exact: true }).click()
  const viewportBox = await boardViewport.boundingBox()
  if (!viewportBox) throw new Error('Board viewport is not visible')
  await waitForSave(page, async () => {
    await page.mouse.move(viewportBox.x + 240, viewportBox.y + 230)
    await page.mouse.down()
    await page.mouse.move(viewportBox.x + 290, viewportBox.y + 195, { steps: 5 })
    await page.mouse.up()
  })
  expect(await boardPosition(folder)).toEqual(folderBeforePan)
  const transformAfterPan = await board.getAttribute('style')
  expect(transformAfterPan).not.toEqual(transformBeforePan)

  await page.reload()
  await expect(folder).toBeVisible()
  expect(await board.getAttribute('style')).toEqual(transformAfterPan)

  const transformBeforePinch = await board.getAttribute('style')
  const browserMetricsBeforePinch = await page.evaluate(() => ({ width: window.innerWidth, height: window.innerHeight, devicePixelRatio: window.devicePixelRatio }))
  await page.keyboard.down('Control')
  await page.mouse.move(viewportBox.x + 400, viewportBox.y + 260)
  await page.mouse.wheel(0, -20)
  await page.keyboard.up('Control')
  await expect.poll(() => board.getAttribute('style')).not.toEqual(transformBeforePinch)
  expect(await page.evaluate(() => ({ width: window.innerWidth, height: window.innerHeight, devicePixelRatio: window.devicePixelRatio }))).toEqual(browserMetricsBeforePinch)
})