import { neo4jgraphql } from 'neo4j-graphql-js'
import { getNeode } from '../../db/neo4j'
import { UserInputError, ForbiddenError } from 'apollo-server'
import { mergeImage, deleteImage } from './images/images'
import Resolver from './helpers/Resolver'
import log from './helpers/databaseLogger'
import { createOrUpdateLocations } from './users/location'

const neode = getNeode()

export const getMutedUsers = async (context) => {
  const { neode } = context
  const userModel = neode.model('User')
  let mutedUsers = neode
    .query()
    .match('user', userModel)
    .where('user.id', context.user.id)
    .relationship(userModel.relationships().get('muted'))
    .to('muted', userModel)
    .return('muted')
  mutedUsers = await mutedUsers.execute()
  mutedUsers = mutedUsers.records.map((r) => r.get('muted').properties)
  return mutedUsers
}

export const getBlockedUsers = async (context) => {
  const { neode } = context
  const userModel = neode.model('User')
  let blockedUsers = neode
    .query()
    .match('user', userModel)
    .where('user.id', context.user.id)
    .relationship(userModel.relationships().get('blocked'))
    .to('blocked', userModel)
    .return('blocked')
  blockedUsers = await blockedUsers.execute()
  blockedUsers = blockedUsers.records.map((r) => r.get('blocked').properties)
  return blockedUsers
}

export default {
  Query: {
    mutedUsers: async (object, args, context, resolveInfo) => {
      try {
        return getMutedUsers(context)
      } catch (e) {
        throw new UserInputError(e.message)
      }
    },
    blockedUsers: async (object, args, context, resolveInfo) => {
      try {
        return getBlockedUsers(context)
      } catch (e) {
        throw new UserInputError(e.message)
      }
    },
    User: async (object, args, context, resolveInfo) => {
      const { email } = args
      if (email) {
        let session
        try {
          session = context.driver.session()
          const readTxResult = await session.readTransaction((txc) => {
            const result = txc.run(
              `
            MATCH (user:User)-[:PRIMARY_EMAIL]->(e:EmailAddress {email: $args.email})
            RETURN user`,
              { args },
            )
            return result
          })
          return readTxResult.records.map((r) => r.get('user').properties)
        } finally {
          session.close()
        }
      }
      return neo4jgraphql(object, args, context, resolveInfo)
    },
  },
  Mutation: {
    muteUser: async (_parent, params, context, _resolveInfo) => {
      const { user: currentUser } = context
      if (currentUser.id === params.id) return null
      await neode.writeCypher(
        `
          MATCH(u:User {id: $currentUser.id})-[previousRelationship:FOLLOWS]->(b:User {id: $params.id})
          DELETE previousRelationship
        `,
        { currentUser, params },
      )
      const [user, mutedUser] = await Promise.all([
        neode.find('User', currentUser.id),
        neode.find('User', params.id),
      ])
      await user.relateTo(mutedUser, 'muted')
      return mutedUser.toJson()
    },
    unmuteUser: async (_parent, params, context, _resolveInfo) => {
      const { user: currentUser } = context
      if (currentUser.id === params.id) return null
      await neode.writeCypher(
        `
          MATCH(u:User {id: $currentUser.id})-[previousRelationship:MUTED]->(b:User {id: $params.id})
          DELETE previousRelationship
        `,
        { currentUser, params },
      )
      const unmutedUser = await neode.find('User', params.id)
      return unmutedUser.toJson()
    },
    blockUser: async (object, args, context, resolveInfo) => {
      const { user: currentUser } = context
      if (currentUser.id === args.id) return null
      await neode.cypher(
        `
      MATCH(u:User {id: $currentUser.id})-[r:FOLLOWS]->(b:User {id: $args.id})
      DELETE r
      `,
        { currentUser, args },
      )
      const [user, blockedUser] = await Promise.all([
        neode.find('User', currentUser.id),
        neode.find('User', args.id),
      ])
      await user.relateTo(blockedUser, 'blocked')
      return blockedUser.toJson()
    },
    unblockUser: async (object, args, context, resolveInfo) => {
      const { user: currentUser } = context
      if (currentUser.id === args.id) return null
      await neode.cypher(
        `
      MATCH(u:User {id: $currentUser.id})-[r:BLOCKED]->(b:User {id: $args.id})
      DELETE r
      `,
        { currentUser, args },
      )
      const blockedUser = await neode.find('User', args.id)
      return blockedUser.toJson()
    },
    UpdateUser: async (_parent, params, context, _resolveInfo) => {
      const { avatar: avatarInput } = params
      delete params.avatar
      params.locationName = params.locationName === '' ? null : params.locationName
      const { termsAndConditionsAgreedVersion } = params
      if (termsAndConditionsAgreedVersion) {
        const regEx = new RegExp(/^[0-9]+\.[0-9]+\.[0-9]+$/g)
        if (!regEx.test(termsAndConditionsAgreedVersion)) {
          throw new ForbiddenError('Invalid version format!')
        }
        params.termsAndConditionsAgreedAt = new Date().toISOString()
      }
      const session = context.driver.session()

      const writeTxResultPromise = session.writeTransaction(async (transaction) => {
        const updateUserTransactionResponse = await transaction.run(
          `
            MATCH (user:User {id: $params.id})
            SET user += $params
            SET user.updatedAt = toString(datetime())
            RETURN user {.*}
          `,
          { params },
        )
        const [user] = updateUserTransactionResponse.records.map((record) => record.get('user'))
        if (avatarInput) {
          await mergeImage(user, 'AVATAR_IMAGE', avatarInput, { transaction })
        }
        return user
      })
      try {
        const user = await writeTxResultPromise
        // TODO: put in a middleware, see "CreateGroup", "UpdateGroup"
        await createOrUpdateLocations('User', params.id, params.locationName, session)
        return user
      } catch (error) {
        throw new UserInputError(error.message)
      } finally {
        session.close()
      }
    },
    DeleteUser: async (object, params, context, resolveInfo) => {
      const { resource, id: userId } = params
      const session = context.driver.session()

      const deleteUserTxResultPromise = session.writeTransaction(async (transaction) => {
        if (resource && resource.length) {
          await Promise.all(
            resource.map(async (node) => {
              const txResult = await transaction.run(
                `
                MATCH (resource:${node})<-[:WROTE]-(author:User {id: $userId})
                OPTIONAL MATCH (resource)<-[:COMMENTS]-(comment:Comment)
                SET resource.deleted = true
                SET resource.content = 'UNAVAILABLE'
                SET resource.contentExcerpt = 'UNAVAILABLE'
                SET resource.language = 'UNAVAILABLE'
                SET resource.createdAt = 'UNAVAILABLE'
                SET resource.updatedAt = 'UNAVAILABLE'
                SET comment.deleted = true
                RETURN resource {.*}
              `,
                {
                  userId,
                },
              )
              return Promise.all(
                txResult.records
                  .map((record) => record.get('resource'))
                  .map((resource) => deleteImage(resource, 'HERO_IMAGE', { transaction })),
              )
            }),
          )
        }

        const deleteUserTransactionResponse = await transaction.run(
          `
              MATCH (user:User {id: $userId})
              SET user.deleted = true
              SET user.name = 'UNAVAILABLE'
              SET user.about = 'UNAVAILABLE'
              SET user.lastActiveAt = 'UNAVAILABLE'
              SET user.createdAt = 'UNAVAILABLE'
              SET user.updatedAt = 'UNAVAILABLE'
              SET user.termsAndConditionsAgreedVersion = 'UNAVAILABLE'
              SET user.encryptedPassword = null
              WITH user
              OPTIONAL MATCH (user)<-[:BELONGS_TO]-(email:EmailAddress)
              DETACH DELETE email
              WITH user
              OPTIONAL MATCH (user)<-[:OWNED_BY]-(socialMedia:SocialMedia)
              DETACH DELETE socialMedia
              RETURN user {.*}
            `,
          { userId },
        )
        log(deleteUserTransactionResponse)
        const [user] = deleteUserTransactionResponse.records.map((record) => record.get('user'))
        await deleteImage(user, 'AVATAR_IMAGE', { transaction })
        return user
      })
      try {
        const user = await deleteUserTxResultPromise
        return user
      } finally {
        session.close()
      }
    },
    switchUserRole: async (object, args, context, resolveInfo) => {
      const { role, id } = args

      if (context.user.id === id) throw new Error('you-cannot-change-your-own-role')
      const session = context.driver.session()
      const writeTxResultPromise = session.writeTransaction(async (transaction) => {
        const switchUserRoleResponse = await transaction.run(
          `
            MATCH (user:User {id: $id})
            SET user.role = $role
            SET user.updatedAt = toString(datetime())
            RETURN user {.*}
          `,
          { id, role },
        )
        const [user] = switchUserRoleResponse.records.map((record) => record.get('user'))
        return user
      })
      try {
        const user = await writeTxResultPromise
        return user
      } finally {
        session.close()
      }
    },
    saveCategorySettings: async (object, args, context, resolveInfo) => {
      const { activeCategories } = args
      const {
        user: { id },
      } = context

      const session = context.driver.session()
      await session.writeTransaction((transaction) => {
        return transaction.run(
          `
          MATCH (user:User { id: $id })-[previousCategories:NOT_INTERESTED_IN]->(category:Category)
          DELETE previousCategories
          RETURN user, category
        `,
          { id },
        )
      })

      // frontend gives [] when all categories are selected (default)
      if (activeCategories.length === 0) return true

      const writeTxResultPromise = session.writeTransaction(async (transaction) => {
        const saveCategorySettingsResponse = await transaction.run(
          `
            MATCH (category:Category) WHERE NOT category.id IN $activeCategories
            MATCH (user:User { id: $id })
            MERGE (user)-[r:NOT_INTERESTED_IN]->(category)
            RETURN user, r, category
          `,
          { id, activeCategories },
        )
        const [user] = await saveCategorySettingsResponse.records.map((record) =>
          record.get('user'),
        )
        return user
      })
      try {
        await writeTxResultPromise
        return true
      } finally {
        session.close()
      }
    },
  },
  User: {
    email: async (parent, params, context, resolveInfo) => {
      if (typeof parent.email !== 'undefined') return parent.email
      const { id } = parent
      const statement = `MATCH(u:User {id: $id})-[:PRIMARY_EMAIL]->(e:EmailAddress) RETURN e`
      const result = await neode.cypher(statement, { id })
      const [{ email }] = result.records.map((r) => r.get('e').properties)
      return email
    },
    ...Resolver('User', {
      undefinedToNull: [
        'actorId',
        'deleted',
        'disabled',
        'locationName',
        'about',
        'termsAndConditionsAgreedVersion',
        'termsAndConditionsAgreedAt',
        'allowEmbedIframes',
        'showShoutsPublicly',
        'sendNotificationEmails',
        'locale',
      ],
      boolean: {
        followedByCurrentUser:
          'MATCH (this)<-[:FOLLOWS]-(u:User {id: $cypherParams.currentUserId}) RETURN COUNT(u) >= 1',
        isBlocked:
          'MATCH (this)<-[:BLOCKED]-(u:User {id: $cypherParams.currentUserId}) RETURN COUNT(u) >= 1',
        blocked:
          'MATCH (this)-[:BLOCKED]-(u:User {id: $cypherParams.currentUserId}) RETURN COUNT(u) >= 1',
        isMuted:
          'MATCH (this)<-[:MUTED]-(u:User {id: $cypherParams.currentUserId}) RETURN COUNT(u) >= 1',
      },
      count: {
        contributionsCount:
          '-[:WROTE]->(related:Post) WHERE NOT related.disabled = true AND NOT related.deleted = true',
        friendsCount: '<-[:FRIENDS]->(related:User)',
        followingCount: '-[:FOLLOWS]->(related:User)',
        followedByCount: '<-[:FOLLOWS]-(related:User)',
        commentedCount:
          '-[:WROTE]->(c:Comment)-[:COMMENTS]->(related:Post) WHERE NOT related.disabled = true AND NOT related.deleted = true',
        shoutedCount:
          '-[:SHOUTED]->(related:Post) WHERE NOT related.disabled = true AND NOT related.deleted = true',
        badgesCount: '<-[:REWARDED]-(related:Badge)',
      },
      hasOne: {
        avatar: '-[:AVATAR_IMAGE]->(related:Image)',
        invitedBy: '<-[:INVITED]-(related:User)',
        location: '-[:IS_IN]->(related:Location)',
        redeemedInviteCode: '-[:REDEEMED]->(related:InviteCode)',
      },
      hasMany: {
        followedBy: '<-[:FOLLOWS]-(related:User)',
        following: '-[:FOLLOWS]->(related:User)',
        friends: '-[:FRIENDS]-(related:User)',
        socialMedia: '<-[:OWNED_BY]-(related:SocialMedia)',
        contributions: '-[:WROTE]->(related:Post)',
        comments: '-[:WROTE]->(related:Comment)',
        shouted: '-[:SHOUTED]->(related:Post)',
        categories: '-[:CATEGORIZED]->(related:Category)',
        badges: '<-[:REWARDED]-(related:Badge)',
        inviteCodes: '-[:GENERATED]->(related:InviteCode)',
      },
    }),
  },
}