export function focusNextMap(reverse = false) {
  const renderedList = this.renderMaps
    .map(render => render.target)
    .filter(ele => ele.getAttribute('data-state') === 'rendered')
  const mapNum = renderedList.length
  if (mapNum === 0) return

  // Get current focused map element
  const currentFocus = this.container.querySelector('.map-container.focus')

  // Remove class name of focus for ALL candidates
  // This may trigger animation
  renderedList.forEach(ele => ele.classList.remove('focus'))

  // Get next existing map element
  const padding = reverse ? -1 : 1
  let nextIndex = currentFocus ? renderedList.indexOf(currentFocus) + padding : 0
  nextIndex = (nextIndex + mapNum) % mapNum
  const nextFocus = renderedList[nextIndex]
  nextFocus.classList.add("focus")

  return nextFocus
}

export function focusDelay() {
  return window.getComputedStyle(this.showcase).display === 'none' ? 50 : 300
}

export function switchToNextLayout(reverse = false) {
  const layouts = this.layouts
  const currentLayoutName = this.container.getAttribute('data-layout')
  const currentIndex = layouts.map(l => l.name).indexOf(currentLayoutName)
  const padding = reverse ? -1 : 1
  const nextIndex = currentIndex === -1 ? 0 : (currentIndex + padding + layouts.length) % layouts.length
  const nextLayout = layouts[nextIndex]
  this.container.setAttribute("data-layout", nextLayout.name)
}

export function focusNextBlock(reverse = false) {
  const blocks = this.blocks.filter(b => b.checkVisibility({
    contentVisibilityAuto: true,
    opacityProperty: true,
    visibilityProperty: true,
  }))
  const currentBlock = blocks.find(b => b.classList.contains('focus'))
  const currentIndex = blocks.indexOf(currentBlock)
  const padding = reverse ? -1 : 1
  const nextIndex = currentIndex === -1 ? 0 : (currentIndex + padding + blocks.length) % blocks.length
  const nextBlock = blocks[nextIndex]
  blocks.forEach(b => b.classList.remove('focus'))
  nextBlock?.classList?.add('focus')
  nextBlock.scrollIntoView({ behavior: 'smooth', block: "nearest" })
}

export function removeBlockFocus() {
  this.blocks.forEach(b => b.classList.remove('focus'))
}