import { test, expect } from '@playwright/test'

const wysiwygUrl = '/en/wysiwyg'

async function getBox(page: import('@playwright/test').Page, nth: number) {
  const el = page.locator('[data-testid^="obj-text-"]').nth(nth)
  const left = await el.evaluate((n) => parseInt((n as HTMLElement).style.left || '0', 10))
  const top = await el.evaluate((n) => parseInt((n as HTMLElement).style.top || '0', 10))
  const width = await el.evaluate((n) => parseInt((n as HTMLElement).style.width || '0', 10))
  const height = await el.evaluate((n) => parseInt((n as HTMLElement).style.height || '0', 10))
  return { left, top, width, height }
}

function snap8(v: number) { return Math.round(v / 8) * 8 }

test.describe('WYSIWYG - Group rotate then resize (N/S) with snap', () => {
  test('rotate ~15°, then group resize S by +16 (snap) — heights grow equally, top unchanged', async ({ page }) => {
    await page.goto(wysiwygUrl)
    const canvas = page.getByTestId('wysiwyg-canvas')
    await expect(canvas).toBeVisible()

    const addText = page.getByRole('button', { name: /^Add Text$/i })
    await addText.click()
    await addText.click()

    // marquee select both
    const cbox = await canvas.boundingBox()
    if (!cbox) throw new Error('canvas not found')
    await page.mouse.move(cbox.x + 40, cbox.y + 40)
    await page.mouse.down()
    await page.mouse.move(cbox.x + 260, cbox.y + 160)
    await page.mouse.up()

    // rotate to ~15°
    const rotateHandle = page.locator('[data-testid^="rotate-handle-"]').first()
    const hbox = await rotateHandle.boundingBox()
    if (!hbox) throw new Error('rotate handle not found')
    await page.mouse.move(hbox.x + 5, hbox.y + 5)
    await page.mouse.down()
    await page.mouse.move(hbox.x + 40, hbox.y + 5)
    await page.mouse.up()

    const b0 = await getBox(page, 0)
    const b1 = await getBox(page, 1)

    // resize south edge of the second by +16px
    const target = page.locator('[data-testid^="obj-text-"]').nth(1)
    const tbox = await target.boundingBox()
    if (!tbox) throw new Error('target not found')
    await page.mouse.move(tbox.x + 5, tbox.y + tbox.height - 3)
    await page.mouse.down()
    await page.mouse.move(tbox.x + 5, tbox.y + tbox.height + 16)
    await page.mouse.up()

    const a0 = await getBox(page, 0)
    const a1 = await getBox(page, 1)

    const dh = snap8(b1.height + 16) - b1.height
    expect(a0.top).toBe(b0.top)
    expect(a1.top).toBe(b1.top)
    expect(a0.height).toBe(b0.height + dh)
    expect(a1.height).toBe(b1.height + dh)
  })

  test('rotate ~15°, then group resize N by +16 (snap) — heights grow equally, top shifts equally', async ({ page }) => {
    await page.goto(wysiwygUrl)
    const canvas = page.getByTestId('wysiwyg-canvas')
    await expect(canvas).toBeVisible()

    const addText = page.getByRole('button', { name: /^Add Text$/i })
    await addText.click()
    await addText.click()

    // marquee select both
    const cbox = await canvas.boundingBox()
    if (!cbox) throw new Error('canvas not found')
    await page.mouse.move(cbox.x + 40, cbox.y + 40)
    await page.mouse.down()
    await page.mouse.move(cbox.x + 260, cbox.y + 160)
    await page.mouse.up()

    // rotate to ~15°
    const rotateHandle = page.locator('[data-testid^="rotate-handle-"]').first()
    const hbox = await rotateHandle.boundingBox()
    if (!hbox) throw new Error('rotate handle not found')
    await page.mouse.move(hbox.x + 5, hbox.y + 5)
    await page.mouse.down()
    await page.mouse.move(hbox.x + 40, hbox.y + 5)
    await page.mouse.up()

    const b0 = await getBox(page, 0)
    const b1 = await getBox(page, 1)

    // resize north edge of the first by -16px (drag up)
    const first = page.locator('[data-testid^="obj-text-"]').first()
    const fbox = await first.boundingBox()
    if (!fbox) throw new Error('first not found')
    await page.mouse.move(fbox.x + 5, fbox.y + 3)
    await page.mouse.down()
    await page.mouse.move(fbox.x + 5, fbox.y - 16)
    await page.mouse.up()

    const a0 = await getBox(page, 0)
    const a1 = await getBox(page, 1)

    const dh = snap8(b0.height + 16) - b0.height
    const dy = a0.top - b0.top
    expect(a0.height).toBe(b0.height + dh)
    expect(a1.height).toBe(b1.height + dh)
    expect(dy).toBeLessThanOrEqual(-16)
    expect(a1.top - b1.top).toBe(dy)
  })
})