import { test, expect } from '@playwright/test'
import { imhotep } from 'imhotep-playwright'
import { loadFixtureInPage, waitForFixtureReady } from './harness.js'

async function fixtureUrl(category: string): Promise<string> {
  const { resolveFixturePage } = await import('./harness.js')
  return 'file://' + resolveFixturePage(category)
}

test.describe('E2E: Frames', () => {
  test('element inside positioned ancestor resolves correct frame', async ({ page }) => {
    const ui = await imhotep(page)
    await page.goto(await fixtureUrl('frames'))
    await waitForFixtureReady(page)

    const ancestorData = await ui.extract('[data-testid="positioned-ancestor"]')
    const childData = await ui.extract('[data-testid="nested-absolute"]')

    expect(Array.isArray(ancestorData)).toBe(true)
    expect(Array.isArray(childData)).toBe(true)

    const ancestorRect = (ancestorData as any[])[0].rect
    const childRect = (childData as any[])[0].rect

    // Absolute child should be positioned within ancestor bounds
    // Use approximate checks since padding and positioning offsets vary
    expect(childRect.x).toBeGreaterThanOrEqual(ancestorRect.x - 5)
    expect(childRect.x + childRect.width).toBeLessThanOrEqual(ancestorRect.x + ancestorRect.width + 5)
    expect(childRect.y + childRect.height).toBeLessThanOrEqual(ancestorRect.y + ancestorRect.height + 5)
  })

  test('element inside scroll container maintains geometry in viewport', async ({ page }) => {
    const ui = await imhotep(page)
    await page.goto(await fixtureUrl('frames'))
    await waitForFixtureReady(page)

    const scrollContainerData = await ui.extract('[data-testid="scroll-container"]')
    const scrollItemData = await ui.extract('[data-testid="scroll-item"]')

    const containerRect = (scrollContainerData as any[])[0].rect
    const itemRect = (scrollItemData as any[])[0].rect

    // Scroll item should be within the scroll container bounds
    expect(itemRect.x).toBeGreaterThanOrEqual(containerRect.x)
    expect(itemRect.y).toBeGreaterThanOrEqual(containerRect.y)
  })

  test('element inside named grid area has correct grid geometry', async ({ page }) => {
    const ui = await imhotep(page)
    await page.goto(await fixtureUrl('frames'))
    await waitForFixtureReady(page)

    const gridData = await ui.extract('[data-testid="grid-container"]')
    const headerData = await ui.extract('[data-testid="grid-header"]')
    const sidebarData = await ui.extract('[data-testid="grid-sidebar"]')
    const contentData = await ui.extract('[data-testid="grid-content"]')
    const footerData = await ui.extract('[data-testid="grid-footer"]')

    const gridRect = (gridData as any[])[0].rect
    const headerRect = (headerData as any[])[0].rect
    const sidebarRect = (sidebarData as any[])[0].rect
    const contentRect = (contentData as any[])[0].rect
    const footerRect = (footerData as any[])[0].rect

    // Header should span full width at top (accounting for grid padding)
    expect(headerRect.x).toBeGreaterThanOrEqual(gridRect.x)
    expect(headerRect.x).toBeLessThanOrEqual(gridRect.x + 20)
    expect(headerRect.width).toBeLessThanOrEqual(gridRect.width)
    expect(headerRect.width).toBeGreaterThanOrEqual(gridRect.width - 40)
    expect(headerRect.y).toBeGreaterThanOrEqual(gridRect.y)
    expect(headerRect.y).toBeLessThanOrEqual(gridRect.y + 20)

    // Sidebar should be left of content
    expect(sidebarRect.x + sidebarRect.width).toBeLessThanOrEqual(contentRect.x + 5)

    // Footer should span full width at bottom
    expect(footerRect.x).toBeGreaterThanOrEqual(gridRect.x)
    expect(footerRect.x).toBeLessThanOrEqual(gridRect.x + 20)
    expect(footerRect.width).toBeLessThanOrEqual(gridRect.width)
    expect(footerRect.width).toBeGreaterThanOrEqual(gridRect.width - 40)
    expect(footerRect.y).toBeGreaterThanOrEqual(contentRect.y + contentRect.height)
  })

  test('fixed element is positioned relative to viewport', async ({ page }) => {
    const ui = await imhotep(page)
    await page.goto(await fixtureUrl('frames'))
    await waitForFixtureReady(page)

    const fixedData = await ui.extract('[data-testid="fixed-box"]')
    const fixedRect = (fixedData as any[])[0].rect

    // Fixed element should be near top-right of viewport
    expect(fixedRect.x).toBeGreaterThan(600)
    expect(fixedRect.y).toBeLessThanOrEqual(40)
    expect(fixedRect.width).toBe(100)
    expect(fixedRect.height).toBe(100)
  })

  test('containing block child respects parent padding offset', async ({ page }) => {
    const ui = await imhotep(page)
    await page.goto(await fixtureUrl('frames'))
    await waitForFixtureReady(page)

    const parentData = await ui.extract('[data-testid="containing-block"]')
    const childData = await ui.extract('[data-testid="absolute-child"]')

    const parentRect = (parentData as any[])[0].rect
    const childRect = (childData as any[])[0].rect

    // Child is absolutely positioned with top:10px left:10px relative to parent's padding edge
    // The exact offset depends on the parent's viewport position; verify relative offset
    expect(childRect.x).toBeGreaterThanOrEqual(parentRect.x)
    expect(childRect.x).toBeLessThanOrEqual(parentRect.x + 40)
    expect(childRect.y).toBeGreaterThanOrEqual(parentRect.y)
    expect(childRect.y).toBeLessThanOrEqual(parentRect.y + 40)
  })
})