import { VisibilityCallbackOptions } from 'config.types'
import { visibilityStates } from './constants'

export const calculateVisibility = ({
  hasResponded,
  previousVisibility,
  requestedVisibility,
  config,
}: VisibilityCallbackOptions) => {
  const { defaults, layoutMode, hideOnNoUserResponse } = config
  const { visible: defaultVisibility } = defaults || {}

  // The app layout should always be open by default.
  if (layoutMode === 'app' && !previousVisibility) {
    return visibilityStates.open
  }

  // Requesting open should override the responded check.
  if (
    layoutMode === 'window' &&
    hideOnNoUserResponse &&
    requestedVisibility !== visibilityStates.open
  ) {
    return hasResponded
      ? requestedVisibility || previousVisibility || visibilityStates.open
      : visibilityStates.hidden
  }

  // Allow users to continue a conversation (if they have responded and no visibility is requested)
  // when switching from the window layout to the inline layout
  if (layoutMode === 'inline' && hasResponded && !requestedVisibility) {
    return previousVisibility || visibilityStates.open
  }

  const baseVisibility = visibilityStates.minimized

  return (
    requestedVisibility ||
    previousVisibility ||
    defaultVisibility ||
    baseVisibility
  )
}