import { describe, it, expect, vi, afterEach } from 'vitest'
import { nextTick, ref } from 'vue'
import { useDismissableLayer } from '../src/lib/use-dismissable-layer'

function firePointerDown(target: EventTarget) {
  const event = new PointerEvent('pointerdown', { bubbles: true, cancelable: true })
  target.dispatchEvent(event)
}

describe('useDismissableLayer', () => {
  afterEach(() => {
    document.body.replaceChildren()
  })

  it('calls onDismiss on Escape keydown while active', () => {
    const containerRef = ref<HTMLElement | null>(document.createElement('div'))
    const active = ref(true)
    const onDismiss = vi.fn()
    useDismissableLayer(containerRef, active, { onDismiss })

    document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true }))

    expect(onDismiss).toHaveBeenCalledOnce()
  })

  it('does not call onDismiss on Escape when inactive', () => {
    const containerRef = ref<HTMLElement | null>(document.createElement('div'))
    const active = ref(false)
    const onDismiss = vi.fn()
    useDismissableLayer(containerRef, active, { onDismiss })

    document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true }))

    expect(onDismiss).not.toHaveBeenCalled()
  })

  it('calls onDismiss on pointerdown outside the container', () => {
    const container = document.createElement('div')
    const outside = document.createElement('div')
    document.body.append(container, outside)
    const containerRef = ref<HTMLElement | null>(container)
    const active = ref(true)
    const onDismiss = vi.fn()
    useDismissableLayer(containerRef, active, { onDismiss })

    firePointerDown(outside)

    expect(onDismiss).toHaveBeenCalledOnce()
  })

  it('does not call onDismiss on pointerdown inside the container', () => {
    const container = document.createElement('div')
    const inside = document.createElement('span')
    container.append(inside)
    document.body.append(container)
    const containerRef = ref<HTMLElement | null>(container)
    const active = ref(true)
    const onDismiss = vi.fn()
    useDismissableLayer(containerRef, active, { onDismiss })

    firePointerDown(inside)

    expect(onDismiss).not.toHaveBeenCalled()
  })

  it('skips onDismiss when onPointerDownOutside calls preventDefault', () => {
    const container = document.createElement('div')
    const outside = document.createElement('div')
    document.body.append(container, outside)
    const containerRef = ref<HTMLElement | null>(container)
    const active = ref(true)
    const onDismiss = vi.fn()
    useDismissableLayer(containerRef, active, {
      onDismiss,
      onPointerDownOutside: (event) => event.preventDefault(),
    })

    firePointerDown(outside)

    expect(onDismiss).not.toHaveBeenCalled()
  })

  it('only dismisses the topmost layer on Escape when layers are stacked', () => {
    const container1 = document.createElement('div')
    const container2 = document.createElement('div')
    document.body.append(container1, container2)
    const active1 = ref(true)
    const active2 = ref(true)
    const onDismiss1 = vi.fn()
    const onDismiss2 = vi.fn()
    useDismissableLayer(ref(container1), active1, { onDismiss: onDismiss1 })
    useDismissableLayer(ref(container2), active2, { onDismiss: onDismiss2 })

    document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true }))

    expect(onDismiss2).toHaveBeenCalledOnce()
    expect(onDismiss1).not.toHaveBeenCalled()

    active1.value = false
    active2.value = false
  })

  it('only dismisses the topmost layer on pointerdown outside it, even inside a lower layer', () => {
    const container1 = document.createElement('div')
    const container2 = document.createElement('div')
    document.body.append(container1, container2)
    const active1 = ref(true)
    const active2 = ref(true)
    const onDismiss1 = vi.fn()
    const onDismiss2 = vi.fn()
    useDismissableLayer(ref(container1), active1, { onDismiss: onDismiss1 })
    useDismissableLayer(ref(container2), active2, { onDismiss: onDismiss2 })

    firePointerDown(container1)

    expect(onDismiss2).toHaveBeenCalledOnce()
    expect(onDismiss1).not.toHaveBeenCalled()

    active1.value = false
    active2.value = false
  })

  it('promotes the next layer to topmost once the top layer deactivates', async () => {
    const container1 = document.createElement('div')
    const container2 = document.createElement('div')
    document.body.append(container1, container2)
    const active1 = ref(true)
    const active2 = ref(true)
    const onDismiss1 = vi.fn()
    const onDismiss2 = vi.fn()
    useDismissableLayer(ref(container1), active1, { onDismiss: onDismiss1 })
    useDismissableLayer(ref(container2), active2, { onDismiss: onDismiss2 })

    active2.value = false
    await nextTick()

    document.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true }))

    expect(onDismiss1).toHaveBeenCalledOnce()

    active1.value = false
  })
})