import {
  compact,
  concat,
  each,
  isArray,
  last,
  map,
  mergeWith,
  uniq,
} from 'lodash'

import { declarations } from 'src/modules/config_declaration'
import { useEmojiStore } from 'src/stores/emoji.js'
import { useInstanceStore } from 'src/stores/instance.js'
import { useInterfaceStore } from 'src/stores/interface.js'
import { useOAuthStore } from 'src/stores/oauth.js'
import { useServerSideStorageStore } from 'src/stores/serverSideStorage'
import apiService from '../services/api/api.service.js'
import backendInteractorService from '../services/backend_interactor_service/backend_interactor_service.js'
import oauthApi from '../services/new_api/oauth.js'
import {
  registerPushNotifications,
  unregisterPushNotifications,
} from '../services/sw/sw.js'
import {
  windowHeight,
  windowWidth,
} from '../services/window_utils/window_utils'

// TODO: Unify with mergeOrAdd in statuses.js
export const mergeOrAdd = (arr, obj, item) => {
  if (!item) {
    return false
  }
  const oldItem = obj[item.id]
  if (oldItem) {
    // We already have this, so only merge the new info.
    mergeWith(oldItem, item, mergeArrayLength)
    return { item: oldItem, new: false }
  } else {
    // This is a new item, prepare it
    arr.push(item)
    obj[item.id] = item
    return { item, new: true }
  }
}

const mergeArrayLength = (oldValue, newValue) => {
  if (isArray(oldValue) && isArray(newValue)) {
    oldValue.length = newValue.length
    return mergeWith(oldValue, newValue, mergeArrayLength)
  }
}

const getNotificationPermission = () => {
  const Notification = window.Notification

  if (!Notification) return Promise.resolve(null)
  if (Notification.permission === 'default')
    return Notification.requestPermission()
  return Promise.resolve(Notification.permission)
}

const blockUser = (store, args) => {
  const id = args.id
  const expiresIn = typeof args === 'object' ? args.expiresIn : 0

  const predictedRelationship = store.state.relationships[id] || { id }
  store.commit('updateUserRelationship', [predictedRelationship])
  store.commit('addBlockId', id)

  return store.rootState.api.backendInteractor
    .blockUser({ id, expiresIn })
    .then((relationship) => {
      store.commit('updateUserRelationship', [relationship])
      store.commit('addBlockId', id)

      store.commit('removeStatus', { timeline: 'friends', userId: id })
      store.commit('removeStatus', { timeline: 'public', userId: id })
      store.commit('removeStatus', {
        timeline: 'publicAndExternal',
        userId: id,
      })
    })
}

const unblockUser = (store, id) => {
  return store.rootState.api.backendInteractor
    .unblockUser({ id })
    .then((relationship) =>
      store.commit('updateUserRelationship', [relationship]),
    )
}

const removeUserFromFollowers = (store, id) => {
  return store.rootState.api.backendInteractor
    .removeUserFromFollowers({ id })
    .then((relationship) =>
      store.commit('updateUserRelationship', [relationship]),
    )
}

const editUserNote = (store, { id, comment }) => {
  return store.rootState.api.backendInteractor
    .editUserNote({ id, comment })
    .then((relationship) =>
      store.commit('updateUserRelationship', [relationship]),
    )
}

const muteUser = (store, args) => {
  const id = typeof args === 'object' ? args.id : args
  const expiresIn = typeof args === 'object' ? args.expiresIn : 0

  const predictedRelationship = store.state.relationships[id] || { id }
  store.commit('updateUserRelationship', [predictedRelationship])
  store.commit('addMuteId', id)

  return store.rootState.api.backendInteractor
    .muteUser({ id, expiresIn })
    .then((relationship) => {
      store.commit('updateUserRelationship', [relationship])
      store.commit('addMuteId', id)
    })
}

const unmuteUser = (store, id) => {
  const predictedRelationship = store.state.relationships[id] || { id }
  predictedRelationship.muting = false
  store.commit('updateUserRelationship', [predictedRelationship])

  return store.rootState.api.backendInteractor
    .unmuteUser({ id })
    .then((relationship) =>
      store.commit('updateUserRelationship', [relationship]),
    )
}

const hideReblogs = (store, userId) => {
  return store.rootState.api.backendInteractor
    .followUser({ id: userId, reblogs: false })
    .then((relationship) => {
      store.commit('updateUserRelationship', [relationship])
    })
}

const showReblogs = (store, userId) => {
  return store.rootState.api.backendInteractor
    .followUser({ id: userId, reblogs: true })
    .then((relationship) =>
      store.commit('updateUserRelationship', [relationship]),
    )
}

const muteDomain = (store, domain) => {
  return store.rootState.api.backendInteractor
    .muteDomain({ domain })
    .then(() => store.commit('addDomainMute', domain))
}

const unmuteDomain = (store, domain) => {
  return store.rootState.api.backendInteractor
    .unmuteDomain({ domain })
    .then(() => store.commit('removeDomainMute', domain))
}

export const mutations = {
  tagUser(state, { user: { id }, tag }) {
    const user = state.usersObject[id]
    const tags = user.tags || []
    const newTags = tags.concat([tag])
    user.tags = newTags
  },
  untagUser(state, { user: { id }, tag }) {
    const user = state.usersObject[id]
    const tags = user.tags || []
    const newTags = tags.filter((t) => t !== tag)
    user.tags = newTags
  },
  updateRight(state, { user: { id }, right, value }) {
    const user = state.usersObject[id]
    const newRights = user.rights
    newRights[right] = value
    user.rights = newRights
  },
  updateActivationStatus(state, { user: { id }, deactivated }) {
    const user = state.usersObject[id]
    user.deactivated = deactivated
  },
  setCurrentUser(state, user) {
    state.lastLoginName = user.screen_name
    state.currentUser = mergeWith(
      state.currentUser || {},
      user,
      mergeArrayLength,
    )
  },
  clearCurrentUser(state) {
    state.currentUser = false
    state.lastLoginName = false
  },
  beginLogin(state) {
    state.loggingIn = true
  },
  endLogin(state) {
    state.loggingIn = false
  },
  saveFriendIds(state, { id, friendIds }) {
    const user = state.usersObject[id]
    user.friendIds = uniq(concat(user.friendIds || [], friendIds))
  },
  saveFollowerIds(state, { id, followerIds }) {
    const user = state.usersObject[id]
    user.followerIds = uniq(concat(user.followerIds || [], followerIds))
  },
  // Because frontend doesn't have a reason to keep these stuff in memory
  // outside of viewing someones user profile.
  clearFriends(state, userId) {
    const user = state.usersObject[userId]
    if (user) {
      user.friendIds = []
    }
  },
  clearFollowers(state, userId) {
    const user = state.usersObject[userId]
    if (user) {
      user.followerIds = []
    }
  },
  addNewUsers(state, users) {
    each(users, (user) => {
      if (user.relationship) {
        state.relationships[user.relationship.id] = user.relationship
      }
      const res = mergeOrAdd(state.users, state.usersObject, user)
      const item = res.item
      if (res.new && item.screen_name && !item.screen_name.includes('@')) {
        state.usersByNameObject[item.screen_name.toLowerCase()] = item
      }
    })
  },
  updateUserRelationship(state, relationships) {
    relationships.forEach((relationship) => {
      state.relationships[relationship.id] = relationship
    })
  },
  updateUserInLists(state, { id, inLists }) {
    state.usersObject[id].inLists = inLists
  },
  saveBlockIds(state, blockIds) {
    state.currentUser.blockIds = blockIds
  },
  addBlockId(state, blockId) {
    if (state.currentUser.blockIds.indexOf(blockId) === -1) {
      state.currentUser.blockIds.push(blockId)
    }
  },
  setBlockIdsMaxId(state, blockIdsMaxId) {
    state.currentUser.blockIdsMaxId = blockIdsMaxId
  },
  saveMuteIds(state, muteIds) {
    state.currentUser.muteIds = muteIds
  },
  setMuteIdsMaxId(state, muteIdsMaxId) {
    state.currentUser.muteIdsMaxId = muteIdsMaxId
  },
  addMuteId(state, muteId) {
    if (state.currentUser.muteIds.indexOf(muteId) === -1) {
      state.currentUser.muteIds.push(muteId)
    }
  },
  saveDomainMutes(state, domainMutes) {
    state.currentUser.domainMutes = domainMutes
  },
  addDomainMute(state, domain) {
    if (state.currentUser.domainMutes.indexOf(domain) === -1) {
      state.currentUser.domainMutes.push(domain)
    }
  },
  removeDomainMute(state, domain) {
    const index = state.currentUser.domainMutes.indexOf(domain)
    if (index !== -1) {
      state.currentUser.domainMutes.splice(index, 1)
    }
  },
  setPinnedToUser(state, status) {
    const user = state.usersObject[status.user.id]
    user.pinnedStatusIds = user.pinnedStatusIds || []
    const index = user.pinnedStatusIds.indexOf(status.id)

    if (status.pinned && index === -1) {
      user.pinnedStatusIds.push(status.id)
    } else if (!status.pinned && index !== -1) {
      user.pinnedStatusIds.splice(index, 1)
    }
  },
  setUserForStatus(state, status) {
    status.user = state.usersObject[status.user.id]
  },
  setUserForNotification(state, notification) {
    if (notification.type !== 'follow') {
      notification.action.user = state.usersObject[notification.action.user.id]
    }
    notification.from_profile = state.usersObject[notification.from_profile.id]
  },
  setColor(state, { user: { id }, highlighted }) {
    const user = state.usersObject[id]
    user.highlight = highlighted
  },
  signUpPending(state) {
    state.signUpPending = true
    state.signUpErrors = []
    state.signUpNotice = {}
  },
  signUpSuccess(state) {
    state.signUpPending = false
  },
  signUpFailure(state, errors) {
    state.signUpPending = false
    state.signUpErrors = errors
    state.signUpNotice = {}
  },
  signUpNotice(state, notice) {
    state.signUpPending = false
    state.signUpErrors = []
    state.signUpNotice = notice
  },
}

export const getters = {
  findUser: (state) => (query) => {
    return state.usersObject[query]
  },
  findUserByName: (state) => (query) => {
    return state.usersByNameObject[query.toLowerCase()]
  },
  findUserByUrl: (state) => (query) => {
    return state.users.find(
      (u) =>
        u.statusnet_profile_url &&
        u.statusnet_profile_url.toLowerCase() === query.toLowerCase(),
    )
  },
  relationship: (state) => (id) => {
    const rel = id && state.relationships[id]
    return rel || { id, loading: true }
  },
}

export const defaultState = {
  loggingIn: false,
  lastLoginName: false,
  currentUser: false,
  users: [],
  usersObject: {},
  usersByNameObject: {},
  signUpPending: false,
  signUpErrors: [],
  signUpNotice: {},
  relationships: {},
}

const users = {
  state: defaultState,
  mutations,
  getters,
  actions: {
    fetchUserIfMissing(store, id) {
      if (!store.getters.findUser(id)) {
        store.dispatch('fetchUser', id)
      }
    },
    fetchUser(store, id) {
      return store.rootState.api.backendInteractor
        .fetchUser({ id })
        .then((user) => {
          store.commit('addNewUsers', [user])
          return user
        })
    },
    fetchUserByName(store, name) {
      return store.rootState.api.backendInteractor
        .fetchUserByName({ name })
        .then((user) => {
          store.commit('addNewUsers', [user])
          return user
        })
    },
    fetchUserRelationship(store, id) {
      if (store.state.currentUser) {
        store.rootState.api.backendInteractor
          .fetchUserRelationship({ id })
          .then((relationships) =>
            store.commit('updateUserRelationship', relationships),
          )
      }
    },
    fetchUserInLists(store, id) {
      if (store.state.currentUser) {
        store.rootState.api.backendInteractor
          .fetchUserInLists({ id })
          .then((inLists) => store.commit('updateUserInLists', { id, inLists }))
      }
    },
    fetchBlocks(store, args) {
      const { reset } = args || {}

      const maxId = store.state.currentUser.blockIdsMaxId
      return store.rootState.api.backendInteractor
        .fetchBlocks({ maxId })
        .then((blocks) => {
          if (reset) {
            store.commit('saveBlockIds', map(blocks, 'id'))
          } else {
            map(blocks, 'id').map((id) => store.commit('addBlockId', id))
          }
          if (blocks.length) {
            store.commit('setBlockIdsMaxId', last(blocks).id)
          }
          store.commit('addNewUsers', blocks)
          return blocks
        })
    },
    blockUser(store, data) {
      return blockUser(store, data)
    },
    unblockUser(store, data) {
      return unblockUser(store, data)
    },
    removeUserFromFollowers(store, id) {
      return removeUserFromFollowers(store, id)
    },
    blockUsers(store, data = []) {
      return Promise.all(data.map((d) => blockUser(store, d)))
    },
    unblockUsers(store, data = []) {
      return Promise.all(data.map((d) => unblockUser(store, d)))
    },
    editUserNote(store, args) {
      return editUserNote(store, args)
    },
    fetchMutes(store, args) {
      const { reset } = args || {}

      const maxId = store.state.currentUser.muteIdsMaxId
      return store.rootState.api.backendInteractor
        .fetchMutes({ maxId })
        .then((mutes) => {
          if (reset) {
            store.commit('saveMuteIds', map(mutes, 'id'))
          } else {
            map(mutes, 'id').map((id) => store.commit('addMuteId', id))
          }
          if (mutes.length) {
            store.commit('setMuteIdsMaxId', last(mutes).id)
          }
          store.commit('addNewUsers', mutes)
          return mutes
        })
    },
    muteUser(store, data) {
      return muteUser(store, data)
    },
    unmuteUser(store, id) {
      return unmuteUser(store, id)
    },
    hideReblogs(store, id) {
      return hideReblogs(store, id)
    },
    showReblogs(store, id) {
      return showReblogs(store, id)
    },
    muteUsers(store, data = []) {
      return Promise.all(data.map((d) => muteUser(store, d)))
    },
    unmuteUsers(store, ids = []) {
      return Promise.all(ids.map((d) => unmuteUser(store, d)))
    },
    fetchDomainMutes(store) {
      return store.rootState.api.backendInteractor
        .fetchDomainMutes()
        .then((domainMutes) => {
          store.commit('saveDomainMutes', domainMutes)
          return domainMutes
        })
    },
    muteDomain(store, domain) {
      return muteDomain(store, domain)
    },
    unmuteDomain(store, domain) {
      return unmuteDomain(store, domain)
    },
    muteDomains(store, domains = []) {
      return Promise.all(domains.map((domain) => muteDomain(store, domain)))
    },
    unmuteDomains(store, domain = []) {
      return Promise.all(domain.map((domain) => unmuteDomain(store, domain)))
    },
    fetchFriends({ rootState, commit }, id) {
      const user = rootState.users.usersObject[id]
      const maxId = last(user.friendIds)
      return rootState.api.backendInteractor
        .fetchFriends({ id, maxId })
        .then((friends) => {
          commit('addNewUsers', friends)
          commit('saveFriendIds', { id, friendIds: map(friends, 'id') })
          return friends
        })
    },
    fetchFollowers({ rootState, commit }, id) {
      const user = rootState.users.usersObject[id]
      const maxId = last(user.followerIds)
      return rootState.api.backendInteractor
        .fetchFollowers({ id, maxId })
        .then((followers) => {
          commit('addNewUsers', followers)
          commit('saveFollowerIds', { id, followerIds: map(followers, 'id') })
          return followers
        })
    },
    clearFriends({ commit }, userId) {
      commit('clearFriends', userId)
    },
    clearFollowers({ commit }, userId) {
      commit('clearFollowers', userId)
    },
    subscribeUser({ rootState, commit }, id) {
      return rootState.api.backendInteractor
        .followUser({ id, notify: true })
        .then((relationship) =>
          commit('updateUserRelationship', [relationship]),
        )
    },
    unsubscribeUser({ rootState, commit }, id) {
      return rootState.api.backendInteractor
        .followUser({ id, notify: false })
        .then((relationship) =>
          commit('updateUserRelationship', [relationship]),
        )
    },
    toggleActivationStatus({ rootState, commit }, { user }) {
      const api = user.deactivated
        ? rootState.api.backendInteractor.activateUser
        : rootState.api.backendInteractor.deactivateUser
      api({ user }).then((user) => {
        const deactivated = !user.is_active
        commit('updateActivationStatus', { user, deactivated })
      })
    },
    registerPushNotifications(store) {
      const token = store.state.currentUser.credentials
      const vapidPublicKey = useInstanceStore().vapidPublicKey
      const isEnabled = store.rootState.config.webPushNotifications
      const notificationVisibility =
        store.rootState.config.notificationVisibility

      registerPushNotifications(
        isEnabled,
        vapidPublicKey,
        token,
        notificationVisibility,
      )
    },
    unregisterPushNotifications(store) {
      const token = store.state.currentUser.credentials

      unregisterPushNotifications(token)
    },
    addNewUsers({ commit }, users) {
      commit('addNewUsers', users)
    },
    addNewStatuses(store, { statuses }) {
      const users = map(statuses, 'user')
      const retweetedUsers = compact(map(statuses, 'retweeted_status.user'))
      store.commit('addNewUsers', users)
      store.commit('addNewUsers', retweetedUsers)

      each(statuses, (status) => {
        // Reconnect users to statuses
        store.commit('setUserForStatus', status)
        // Set pinned statuses to user
        store.commit('setPinnedToUser', status)
      })
      each(compact(map(statuses, 'retweeted_status')), (status) => {
        // Reconnect users to retweets
        store.commit('setUserForStatus', status)
        // Set pinned retweets to user
        store.commit('setPinnedToUser', status)
      })
    },
    addNewNotifications(store, { notifications }) {
      const users = map(notifications, 'from_profile')
      const targetUsers = map(notifications, 'target').filter((_) => _)
      const notificationIds = notifications.map((_) => _.id)
      store.commit('addNewUsers', users)
      store.commit('addNewUsers', targetUsers)

      const notificationsObject = store.rootState.notifications.idStore
      const relevantNotifications = Object.entries(notificationsObject)
        .filter(([k]) => notificationIds.includes(k))
        .map(([, val]) => val)

      // Reconnect users to notifications
      each(relevantNotifications, (notification) => {
        store.commit('setUserForNotification', notification)
      })
    },
    searchUsers({ rootState, commit }, { query }) {
      return rootState.api.backendInteractor
        .searchUsers({ query })
        .then((users) => {
          commit('addNewUsers', users)
          return users
        })
    },
    async signUp(store, userInfo) {
      const oauthStore = useOAuthStore()
      store.commit('signUpPending')

      try {
        const token = await oauthStore.ensureAppToken()
        const data = await apiService.register({
          credentials: token,
          params: { ...userInfo },
        })

        if (data.access_token) {
          store.commit('signUpSuccess')
          oauthStore.setToken(data.access_token)
          await store.dispatch('loginUser', data.access_token)
          return 'ok'
        } else {
          // Request succeeded, but user cannot login yet.
          store.commit('signUpNotice', data)
          return 'request_sent'
        }
      } catch (e) {
        const errors = e.message
        store.commit('signUpFailure', errors)
        throw e
      }
    },
    async getCaptcha(store) {
      return store.rootState.api.backendInteractor.getCaptcha()
    },

    logout(store) {
      const oauth = useOAuthStore()

      // NOTE: No need to verify the app still exists, because if it doesn't,
      // the token will be invalid too
      return oauth
        .ensureApp()
        .then((app) => {
          const params = {
            app,
            instance: useInstanceStore().server,
            token: oauth.userToken,
          }

          return oauthApi.revokeToken(params)
        })
        .then(() => {
          store.commit('clearCurrentUser')
          store.dispatch('disconnectFromSocket')
          oauth.clearToken()
          store.dispatch('stopFetchingTimeline', 'friends')
          store.commit(
            'setBackendInteractor',
            backendInteractorService(oauth.getToken),
          )
          store.dispatch('stopFetchingNotifications')
          store.dispatch('stopFetchingLists')
          store.dispatch('stopFetchingBookmarkFolders')
          store.dispatch('stopFetchingFollowRequests')
          store.commit('clearNotifications')
          store.commit('resetStatuses')
          store.dispatch('resetChats')
          useInterfaceStore().setLastTimeline('public-timeline')
          useInterfaceStore().setLayoutWidth(windowWidth())
          useInterfaceStore().setLayoutHeight(windowHeight())
          store.commit('clearServerSideStorage')
        })
    },
    loginUser(store, accessToken) {
      return new Promise((resolve, reject) => {
        const commit = store.commit
        const dispatch = store.dispatch
        commit('beginLogin')
        store.rootState.api.backendInteractor
          .verifyCredentials(accessToken)
          .then((data) => {
            if (!data.error) {
              const user = data
              // user.credentials = userCredentials
              user.credentials = accessToken
              user.blockIds = []
              user.muteIds = []
              user.domainMutes = []
              commit('setCurrentUser', user)

              useServerSideStorageStore().setServerSideStorage(user)
              commit('addNewUsers', [user])

              useEmojiStore().fetchEmoji()

              getNotificationPermission().then((permission) =>
                useInterfaceStore().setNotificationPermission(permission),
              )

              // Set our new backend interactor
              commit(
                'setBackendInteractor',
                backendInteractorService(accessToken),
              )

              // Do server-side storage migrations

              // Debug snippet to clean up storage and reset migrations
              /*
              // Reset wordfilter
              Object.keys(
                useServerSideStorageStore().prefsStorage.simple.muteFilters
              ).forEach(key => {
                useServerSideStorageStore().unsetPreference({ path: 'simple.muteFilters.' + key, value: null })
              })

              // Reset flag to 0 to re-run migrations
              useServerSideStorageStore().setFlag({ flag: 'configMigration', value: 0 })
              /**/

              const { configMigration } =
                useServerSideStorageStore().flagStorage
              declarations
                .filter((x) => {
                  return (
                    x.store === 'server-side' &&
                    x.migrationNum > 0 &&
                    x.migrationNum > configMigration
                  )
                })
                .toSorted((a, b) => a.configMigration - b.configMigration)
                .forEach((value) => {
                  value.migration(useServerSideStorageStore(), store.rootState)
                  useServerSideStorageStore().setFlag({
                    flag: 'configMigration',
                    value: value.migrationNum,
                  })
                  useServerSideStorageStore().pushServerSideStorage()
                })

              if (user.token) {
                dispatch('setWsToken', user.token)

                // Initialize the shout socket.
                dispatch('initializeSocket')
              }

              const startPolling = () => {
                // Start getting fresh posts.
                dispatch('startFetchingTimeline', { timeline: 'friends' })

                // Start fetching notifications
                dispatch('startFetchingNotifications')

                if (
                  useInstanceStore().featureSet.pleromaChatMessagesAvailable
                ) {
                  // Start fetching chats
                  dispatch('startFetchingChats')
                }
              }

              dispatch('startFetchingLists')
              dispatch('startFetchingBookmarkFolders')

              if (user.locked) {
                dispatch('startFetchingFollowRequests')
              }

              if (store.getters.mergedConfig.useStreamingApi) {
                dispatch('fetchTimeline', { timeline: 'friends', since: null })
                dispatch('fetchNotifications', { since: null })
                dispatch('enableMastoSockets', true)
                  .catch((error) => {
                    console.error(
                      'Failed initializing MastoAPI Streaming socket',
                      error,
                    )
                  })
                  .then(() => {
                    dispatch('fetchChats', { latest: true })
                    setTimeout(
                      () => dispatch('setNotificationsSilence', false),
                      10000,
                    )
                  })
              } else {
                startPolling()
              }

              // Get user mutes
              dispatch('fetchMutes')

              useInterfaceStore().setLayoutWidth(windowWidth())
              useInterfaceStore().setLayoutHeight(windowHeight())

              // Fetch our friends
              store.rootState.api.backendInteractor
                .fetchFriends({ id: user.id })
                .then((friends) => commit('addNewUsers', friends))
            } else {
              const response = data.error
              // Authentication failed
              commit('endLogin')

              // remove authentication token on client/authentication errors
              if ([400, 401, 403, 422].includes(response.status)) {
                useOAuthStore().clearToken()
              }

              if (response.status === 401) {
                reject(new Error('Wrong username or password'))
              } else {
                reject(new Error('An error occurred, please try again'))
              }
            }
            commit('endLogin')
            resolve()
          })
          .catch((error) => {
            console.error(error)
            commit('endLogin')
            reject(new Error('Failed to connect to server, try again'))
          })
      })
    },
  },
}

export default users