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

const wysiwygUrl = '/en/wysiwyg'

// Helper to read left/top/width from inline styles
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))
  return { left, top, width }
}

test.describe('WYSIWYG - Snap priority (edge > center > grid)', () => {
  test('dragging near another object prefers edge snap over grid', async ({ page }) => {
    await page.goto(wysiwygUrl)
    const canvas = page.getByTestId('wysiwyg-canvas')
    await expect(canvas).toBeVisible()

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

    // Marquee select the second to get its bbox and then drag it near the first one's right edge
    const first = page.locator('[data-testid^="obj-text-"]').first()
    const second = page.locator('[data-testid^="obj-text-"]').nth(1)

    const b1 = await first.boundingBox()
    const b2 = await second.boundingBox()
    if (!b1 || !b2) throw new Error('objects not found')

    // Drag second so that its left aligns to first.right (edge snapping scenario)
    // move handle point from second.x+5 to target x = first.right - 2 (close enough to trigger snap)
    const targetX = b1.x + b1.width - 2
    await page.mouse.move(b2.x + 5, b2.y + 5)
    await page.mouse.down()
    await page.mouse.move(targetX, b2.y + 5)
    await page.mouse.up()

    // Read inline left/width to verify alignment: second.left ~= first.left + first.width
    const s = await getBox(page, 1)
    const f = await getBox(page, 0)
    const expectedLeft = f.left + f.width
    // Allow small tolerance (±1) due to rounding during drag
    expect(Math.abs(s.left - expectedLeft)).toBeLessThanOrEqual(1)
  })

  test('dragging near another object prefers center snap over grid', 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()

    const first = page.locator('[data-testid^="obj-text-"]').first()
    const second = page.locator('[data-testid^="obj-text-"]').nth(1)
    const b1 = await first.boundingBox()
    const b2 = await second.boundingBox()
    if (!b1 || !b2) throw new Error('objects not found')

    // Target the center alignment: move second so its centerX ~= first.centerX
    const firstCenterX = b1.x + b1.width / 2
    await page.mouse.move(b2.x + b2.width / 2, b2.y + 5)
    await page.mouse.down()
    await page.mouse.move(firstCenterX, b2.y + 5)
    await page.mouse.up()

    const f = await getBox(page, 0)
    const s = await getBox(page, 1)
    const sCenter = s.left + Math.round((await second.evaluate((n)=>parseInt((n as HTMLElement).style.width||'0',10))) / 2)
    expect(Math.abs(sCenter - (f.left + f.width / 2))).toBeLessThanOrEqual(1)
  })

  test('when no nearby objects, grid snapping applies (13px → 16px)', 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()

    const obj = page.locator('[data-testid^="obj-text-"]').first()
    const b = await obj.boundingBox()
    if (!b) throw new Error('object not found')

    const before = await getBox(page, 0)
    await page.mouse.move(b.x + 5, b.y + 5)
    await page.mouse.down()
    await page.mouse.move(b.x + 5 + 13, b.y + 5)
    await page.mouse.up()

    const after = await getBox(page, 0)
    expect(after.left - before.left).toBe(16)
  })
})