export function getTagFullPath(router, tag) {
  if (tag.fullPath) return tag.fullPath
  return router.resolve({
    path: tag.path,
    query: tag.query || {}
  }).route.fullPath
}

function getNavigationTarget(router, remainingTags, fallback) {
  if (fallback) {
    const fallbackRoute = router.resolve(fallback).route
    const matchingTag = remainingTags.slice().reverse().find((tag) => {
      return router.resolve(getTagFullPath(router, tag)).route.path === fallbackRoute.path
    })
    return matchingTag ? getTagFullPath(router, matchingTag) : fallback
  }

  const target = remainingTags[remainingTags.length - 1]
  return target ? getTagFullPath(router, target) : null
}

export function closeRouteView({ router, store, route, tag, fallback }) {
  const currentRoute = route || router.currentRoute
  const targetTag = tag || store.state.tagList.find((item) => {
    return getTagFullPath(router, item) === currentRoute.fullPath
  })
  const targetFullPath = targetTag
    ? getTagFullPath(router, targetTag)
    : currentRoute.fullPath
  const remainingTags = store.state.tagList.filter((item) => {
    return getTagFullPath(router, item) !== targetFullPath
  })
  const isActive = targetFullPath === router.currentRoute.fullPath
  const pruneKey = targetTag && targetTag.cacheKey
    ? targetTag.cacheKey
    : targetFullPath

  const removeTagAndPrune = () => {
    const latestTags = store.state.tagList.filter((item) => {
      return getTagFullPath(router, item) !== targetFullPath
    })
    store.commit('SET_TAGLIST', latestTags)
    store.commit('PRUNE_VIEW_CACHE', pruneKey)
  }

  if (!isActive) {
    removeTagAndPrune()
    return Promise.resolve()
  }

  const navigationTarget = getNavigationTarget(router, remainingTags, fallback)
  if (!navigationTarget) {
    removeTagAndPrune()
    return Promise.resolve()
  }

  return Promise.resolve(router.push(navigationTarget)).then(
    (result) => {
      removeTagAndPrune()
      return result
    },
    (error) => {
      removeTagAndPrune()
      throw error
    }
  )
}