import assert from 'node:assert/strict'
import test from 'node:test'
import { computed, effectScope, nextTick, ref } from 'vue'
import { useAdminMarkdownSlashMenuPosition } from '../composables/useAdminMarkdownSlashMenuPosition.js'

/**
 * 테스트용 브라우저 window 객체를 설치한다.
 * @returns {{ added: string[], removed: string[], restore: () => void }} 이벤트 기록과 복구 함수
 */
const installWindowStub = () => {
  const previousWindow = globalThis.window
  const added = []
  const removed = []

  globalThis.window = {
    innerHeight: 800,
    innerWidth: 1200,
    addEventListener: (eventName) => {
      added.push(eventName)
    },
    removeEventListener: (eventName) => {
      removed.push(eventName)
    }
  }

  return {
    added,
    removed,
    restore: () => {
      if (previousWindow === undefined) {
        delete globalThis.window
        return
      }

      globalThis.window = previousWindow
    }
  }
}

/**
 * 슬래시 메뉴 위치 composable 테스트 상태를 생성한다.
 * @param {Object} [overrides] - 상태 재정의
 * @returns {Object} 테스트 상태
 */
const createSlashMenuPositionHarness = (overrides = {}) => {
  const activeMode = ref(overrides.activeMode ?? 'preview')
  const markdownValue = ref(overrides.markdownValue ?? '/image')
  const liveSlashSourceLine = ref(overrides.sourceLine ?? 0)
  const liveSlashQuery = ref(overrides.query ?? 'image')
  const liveSlashHighlightedIndex = ref(overrides.highlightedIndex ?? 0)
  const liveSlashMenuPosition = ref({ top: 0, left: 0 })
  const liveSlashMenuRef = ref(overrides.menuRef ?? null)
  const liveSlashVisible = computed(() => liveSlashSourceLine.value !== null)
  const visibleLiveSlashCommands = ref(overrides.commands ?? [{ id: 'image' }, { id: 'gallery' }])
  const resetCalls = []
  const clampCalls = []
  const previewSurfaceEvents = []
  const textareaEvents = []
  const previewSurface = {
    addEventListener: (eventName) => previewSurfaceEvents.push(`add:${eventName}`),
    removeEventListener: (eventName) => previewSurfaceEvents.push(`remove:${eventName}`)
  }
  const textarea = {
    scrollTop: 0,
    scrollLeft: 0,
    addEventListener: (eventName) => textareaEvents.push(`add:${eventName}`),
    removeEventListener: (eventName) => textareaEvents.push(`remove:${eventName}`),
    getBoundingClientRect: () => ({ top: 20, left: 30 })
  }

  return {
    options: {
      activeMode,
      markdownValue,
      liveSlashSourceLine,
      liveSlashQuery,
      liveSlashHighlightedIndex,
      liveSlashMenuPosition,
      liveSlashMenuRef,
      liveSlashVisible,
      visibleLiveSlashCommands,
      resetLiveSlashHighlightedIndex: () => resetCalls.push('reset'),
      clampLiveSlashHighlightedIndex: (commandCount) => clampCalls.push(commandCount),
      getPreviewSourceLineElement: () => ({
        getBoundingClientRect: () => ({ top: 100, bottom: 124, left: 48 })
      }),
      getPreviewSurfaceElement: () => previewSurface,
      getWriteTextareaElement: () => textarea,
      isClient: true
    },
    activeMode,
    liveSlashSourceLine,
    liveSlashQuery,
    liveSlashHighlightedIndex,
    liveSlashMenuPosition,
    liveSlashMenuRef,
    visibleLiveSlashCommands,
    resetCalls,
    clampCalls,
    previewSurfaceEvents,
    textareaEvents
  }
}

test('관리자 Markdown 슬래시 메뉴 위치는 미리보기 줄 기준으로 갱신한다', async () => {
  const windowStub = installWindowStub()
  const scope = effectScope()
  const harness = createSlashMenuPositionHarness({
    menuRef: {
      offsetHeight: 160,
      offsetWidth: 240
    }
  })

  try {
    scope.run(() => {
      const position = useAdminMarkdownSlashMenuPosition(harness.options)
      position.updateLiveSlashMenuPosition()
    })

    await nextTick()
    await nextTick()

    assert.deepEqual(harness.liveSlashMenuPosition.value, {
      top: 128,
      left: 48
    })
  } finally {
    scope.stop()
    windowStub.restore()
  }
})

test('관리자 Markdown 슬래시 메뉴 위치는 노출 상태에 맞춰 스크롤 리스너를 정리한다', async () => {
  const windowStub = installWindowStub()
  const scope = effectScope()
  const harness = createSlashMenuPositionHarness()

  try {
    scope.run(() => {
      useAdminMarkdownSlashMenuPosition(harness.options)
    })

    harness.liveSlashSourceLine.value = null
    await nextTick()
    harness.liveSlashSourceLine.value = 0
    await nextTick()
    harness.liveSlashSourceLine.value = null
    await nextTick()

    assert.deepEqual(windowStub.added, ['scroll', 'resize'])
    assert.deepEqual(windowStub.removed.slice(-2), ['scroll', 'resize'])
    assert.deepEqual(harness.previewSurfaceEvents, ['add:scroll', 'remove:scroll'])
    assert.deepEqual(harness.textareaEvents, ['add:scroll', 'remove:scroll'])
  } finally {
    scope.stop()
    windowStub.restore()
  }
})

test('관리자 Markdown 슬래시 메뉴 하이라이트는 메뉴 안으로 스크롤된다', async () => {
  const windowStub = installWindowStub()
  const scope = effectScope()
  const menu = {
    offsetHeight: 160,
    offsetWidth: 240,
    scrollTop: 0,
    clientHeight: 80,
    querySelector: () => ({
      offsetTop: 120,
      offsetHeight: 32
    })
  }
  const harness = createSlashMenuPositionHarness({
    menuRef: {
      getRootElement: () => menu
    }
  })

  try {
    scope.run(() => {
      useAdminMarkdownSlashMenuPosition(harness.options)
    })

    harness.liveSlashHighlightedIndex.value = 1
    await nextTick()
    await nextTick()

    assert.equal(menu.scrollTop, 72)
  } finally {
    scope.stop()
    windowStub.restore()
  }
})

test('관리자 Markdown 슬래시 메뉴 검색어와 명령 수 변경은 하이라이트를 보정한다', async () => {
  const windowStub = installWindowStub()
  const scope = effectScope()
  const harness = createSlashMenuPositionHarness()

  try {
    scope.run(() => {
      useAdminMarkdownSlashMenuPosition(harness.options)
    })

    harness.liveSlashQuery.value = 'callout'
    harness.visibleLiveSlashCommands.value = [{ id: 'callout' }]
    await nextTick()

    assert.deepEqual(harness.resetCalls, ['reset'])
    assert.deepEqual(harness.clampCalls, [1])
  } finally {
    scope.stop()
    windowStub.restore()
  }
})