import { RIGHTS } from '@/auth/RIGHTS'
import { Context, getUser, getClientTimezoneOffset } from '@/server/context'
import { backendLogger as logger } from '@/server/logger'
import { Contribution as DbContribution } from '@entity/Contribution'
import { Arg, Args, Authorized, Ctx, Int, Mutation, Query, Resolver } from 'type-graphql'
import { FindOperator, IsNull, In, getConnection } from '@dbTools/typeorm'
import ContributionArgs from '@arg/ContributionArgs'
import Paginated from '@arg/Paginated'
import { Order } from '@enum/Order'
import { ContributionType } from '@enum/ContributionType'
import { ContributionStatus } from '@enum/ContributionStatus'
import { Contribution, ContributionListResult } from '@model/Contribution'
import { UnconfirmedContribution } from '@model/UnconfirmedContribution'
import {
  getUserCreation,
  getUserCreations,
  validateContribution,
  updateCreations,
  isValidDateString,
} from './util/creations'
import { MEMO_MAX_CHARS, MEMO_MIN_CHARS, FULL_CREATION_AVAILABLE } from './const/const'
import { ContributionMessage } from '@entity/ContributionMessage'
import { ContributionMessageType } from '@enum/MessageType'
import {
  Event,
  EventContributionCreate,
  EventContributionDelete,
  EventContributionUpdate,
  EventContributionConfirm,
  EventAdminContributionCreate,
  EventAdminContributionDelete,
  EventAdminContributionUpdate,
} from '@/event/Event'
import { eventProtocol } from '@/event/EventProtocolEmitter'
import AdminCreateContributionArgs from '@arg/AdminCreateContributionArgs'
import AdminUpdateContributionArgs from '@arg/AdminUpdateContributionArgs'
import Decimal from 'decimal.js-light'
import CONFIG from '@/config'
import { UserContact } from '@entity/UserContact'
import { AdminCreateContributions } from '@model/AdminCreateContributions'
import { AdminUpdateContribution } from '@model/AdminUpdateContribution'
import { User as DbUser } from '@entity/User'
import { sendContributionRejectedEmail } from '@/mailer/sendContributionRejectedEmail'
import { Transaction as DbTransaction } from '@entity/Transaction'
import { Decay } from '@model/Decay'
import { TransactionTypeId } from '@enum/TransactionTypeId'
import { calculateDecay } from '@/util/decay'
import { sendContributionConfirmedEmail } from '@/mailer/sendContributionConfirmedEmail'

@Resolver()
export class ContributionResolver {
  @Authorized([RIGHTS.CREATE_CONTRIBUTION])
  @Mutation(() => UnconfirmedContribution)
  async createContribution(
    @Args() { amount, memo, creationDate }: ContributionArgs,
    @Ctx() context: Context,
  ): Promise<UnconfirmedContribution> {
    const clientTimezoneOffset = getClientTimezoneOffset(context)
    if (memo.length > MEMO_MAX_CHARS) {
      logger.error(`memo text is too long: memo.length=${memo.length} > ${MEMO_MAX_CHARS}`)
      throw new Error(`memo text is too long (${MEMO_MAX_CHARS} characters maximum)`)
    }

    if (memo.length < MEMO_MIN_CHARS) {
      logger.error(`memo text is too short: memo.length=${memo.length} < ${MEMO_MIN_CHARS}`)
      throw new Error(`memo text is too short (${MEMO_MIN_CHARS} characters minimum)`)
    }

    const event = new Event()

    const user = getUser(context)
    const creations = await getUserCreation(user.id, clientTimezoneOffset)
    logger.trace('creations', creations)
    const creationDateObj = new Date(creationDate)
    validateContribution(creations, amount, creationDateObj, clientTimezoneOffset)

    const contribution = DbContribution.create()
    contribution.userId = user.id
    contribution.amount = amount
    contribution.createdAt = new Date()
    contribution.contributionDate = creationDateObj
    contribution.memo = memo
    contribution.contributionType = ContributionType.USER
    contribution.contributionStatus = ContributionStatus.PENDING

    logger.trace('contribution to save', contribution)
    await DbContribution.save(contribution)

    const eventCreateContribution = new EventContributionCreate()
    eventCreateContribution.userId = user.id
    eventCreateContribution.amount = amount
    eventCreateContribution.contributionId = contribution.id
    await eventProtocol.writeEvent(event.setEventContributionCreate(eventCreateContribution))

    return new UnconfirmedContribution(contribution, user, creations)
  }

  @Authorized([RIGHTS.DELETE_CONTRIBUTION])
  @Mutation(() => Boolean)
  async deleteContribution(
    @Arg('id', () => Int) id: number,
    @Ctx() context: Context,
  ): Promise<boolean> {
    const event = new Event()
    const user = getUser(context)
    const contribution = await DbContribution.findOne(id)
    if (!contribution) {
      logger.error('Contribution not found for given id')
      throw new Error('Contribution not found for given id.')
    }
    if (contribution.userId !== user.id) {
      logger.error('Can not delete contribution of another user')
      throw new Error('Can not delete contribution of another user')
    }
    if (contribution.confirmedAt) {
      logger.error('A confirmed contribution can not be deleted')
      throw new Error('A confirmed contribution can not be deleted')
    }

    contribution.contributionStatus = ContributionStatus.DELETED
    contribution.deletedBy = user.id
    contribution.deletedAt = new Date()
    await contribution.save()

    const eventDeleteContribution = new EventContributionDelete()
    eventDeleteContribution.userId = user.id
    eventDeleteContribution.contributionId = contribution.id
    eventDeleteContribution.amount = contribution.amount
    await eventProtocol.writeEvent(event.setEventContributionDelete(eventDeleteContribution))

    const res = await contribution.softRemove()
    return !!res
  }

  @Authorized([RIGHTS.LIST_CONTRIBUTIONS])
  @Query(() => ContributionListResult)
  async listContributions(
    @Args()
    { currentPage = 1, pageSize = 5, order = Order.DESC }: Paginated,
    @Arg('filterConfirmed', () => Boolean)
    filterConfirmed: boolean | null,
    @Ctx() context: Context,
  ): Promise<ContributionListResult> {
    const user = getUser(context)
    const where: {
      userId: number
      confirmedBy?: FindOperator<number> | null
    } = { userId: user.id }

    if (filterConfirmed) where.confirmedBy = IsNull()

    const [contributions, count] = await getConnection()
      .createQueryBuilder()
      .select('c')
      .from(DbContribution, 'c')
      .leftJoinAndSelect('c.messages', 'm')
      .where(where)
      .withDeleted()
      .orderBy('c.createdAt', order)
      .limit(pageSize)
      .offset((currentPage - 1) * pageSize)
      .getManyAndCount()

    return new ContributionListResult(
      count,
      contributions.map((contribution) => new Contribution(contribution, user)),
    )
  }

  @Authorized([RIGHTS.LIST_ALL_CONTRIBUTIONS])
  @Query(() => ContributionListResult)
  async listAllContributions(
    @Args()
    { currentPage = 1, pageSize = 5, order = Order.DESC }: Paginated,
  ): Promise<ContributionListResult> {
    const [dbContributions, count] = await getConnection()
      .createQueryBuilder()
      .select('c')
      .from(DbContribution, 'c')
      .innerJoinAndSelect('c.user', 'u')
      .orderBy('c.createdAt', order)
      .limit(pageSize)
      .offset((currentPage - 1) * pageSize)
      .getManyAndCount()
    return new ContributionListResult(
      count,
      dbContributions.map((contribution) => new Contribution(contribution, contribution.user)),
    )
  }

  @Authorized([RIGHTS.UPDATE_CONTRIBUTION])
  @Mutation(() => UnconfirmedContribution)
  async updateContribution(
    @Arg('contributionId', () => Int)
    contributionId: number,
    @Args() { amount, memo, creationDate }: ContributionArgs,
    @Ctx() context: Context,
  ): Promise<UnconfirmedContribution> {
    const clientTimezoneOffset = getClientTimezoneOffset(context)
    if (memo.length > MEMO_MAX_CHARS) {
      logger.error(`memo text is too long: memo.length=${memo.length} > ${MEMO_MAX_CHARS}`)
      throw new Error(`memo text is too long (${MEMO_MAX_CHARS} characters maximum)`)
    }

    if (memo.length < MEMO_MIN_CHARS) {
      logger.error(`memo text is too short: memo.length=${memo.length} < ${MEMO_MIN_CHARS}`)
      throw new Error(`memo text is too short (${MEMO_MIN_CHARS} characters minimum)`)
    }

    const user = getUser(context)

    const contributionToUpdate = await DbContribution.findOne({
      where: { id: contributionId, confirmedAt: IsNull() },
    })
    if (!contributionToUpdate) {
      logger.error('No contribution found to given id')
      throw new Error('No contribution found to given id.')
    }
    if (contributionToUpdate.userId !== user.id) {
      logger.error('user of the pending contribution and send user does not correspond')
      throw new Error('user of the pending contribution and send user does not correspond')
    }
    if (
      contributionToUpdate.contributionStatus !== ContributionStatus.IN_PROGRESS &&
      contributionToUpdate.contributionStatus !== ContributionStatus.PENDING
    ) {
      logger.error(
        `Contribution can not be updated since the state is ${contributionToUpdate.contributionStatus}`,
      )
      throw new Error(
        `Contribution can not be updated since the state is ${contributionToUpdate.contributionStatus}`,
      )
    }
    const creationDateObj = new Date(creationDate)
    let creations = await getUserCreation(user.id, clientTimezoneOffset)
    if (contributionToUpdate.contributionDate.getMonth() === creationDateObj.getMonth()) {
      creations = updateCreations(creations, contributionToUpdate, clientTimezoneOffset)
    } else {
      logger.error('Currently the month of the contribution cannot change.')
      throw new Error('Currently the month of the contribution cannot change.')
    }

    // all possible cases not to be true are thrown in this function
    validateContribution(creations, amount, creationDateObj, clientTimezoneOffset)

    const contributionMessage = ContributionMessage.create()
    contributionMessage.contributionId = contributionId
    contributionMessage.createdAt = contributionToUpdate.updatedAt
      ? contributionToUpdate.updatedAt
      : contributionToUpdate.createdAt
    const changeMessage = `${contributionToUpdate.contributionDate}
    ---
    ${contributionToUpdate.memo}
    ---
    ${contributionToUpdate.amount}`
    contributionMessage.message = changeMessage
    contributionMessage.isModerator = false
    contributionMessage.userId = user.id
    contributionMessage.type = ContributionMessageType.HISTORY
    ContributionMessage.save(contributionMessage)

    contributionToUpdate.amount = amount
    contributionToUpdate.memo = memo
    contributionToUpdate.contributionDate = new Date(creationDate)
    contributionToUpdate.contributionStatus = ContributionStatus.PENDING
    contributionToUpdate.updatedAt = new Date()
    DbContribution.save(contributionToUpdate)

    const event = new Event()

    const eventUpdateContribution = new EventContributionUpdate()
    eventUpdateContribution.userId = user.id
    eventUpdateContribution.contributionId = contributionId
    eventUpdateContribution.amount = amount
    await eventProtocol.writeEvent(event.setEventContributionUpdate(eventUpdateContribution))

    return new UnconfirmedContribution(contributionToUpdate, user, creations)
  }

  @Authorized([RIGHTS.ADMIN_CREATE_CONTRIBUTION])
  @Mutation(() => [Number])
  async adminCreateContribution(
    @Args() { email, amount, memo, creationDate }: AdminCreateContributionArgs,
    @Ctx() context: Context,
  ): Promise<Decimal[]> {
    logger.info(
      `adminCreateContribution(email=${email}, amount=${amount}, memo=${memo}, creationDate=${creationDate})`,
    )
    const clientTimezoneOffset = getClientTimezoneOffset(context)
    if (!isValidDateString(creationDate)) {
      logger.error(`invalid Date for creationDate=${creationDate}`)
      throw new Error(`invalid Date for creationDate=${creationDate}`)
    }
    const emailContact = await UserContact.findOne({
      where: { email },
      withDeleted: true,
      relations: ['user'],
    })
    if (!emailContact) {
      logger.error(`Could not find user with email: ${email}`)
      throw new Error(`Could not find user with email: ${email}`)
    }
    if (emailContact.deletedAt) {
      logger.error('This emailContact was deleted. Cannot create a contribution.')
      throw new Error('This emailContact was deleted. Cannot create a contribution.')
    }
    if (emailContact.user.deletedAt) {
      logger.error('This user was deleted. Cannot create a contribution.')
      throw new Error('This user was deleted. Cannot create a contribution.')
    }
    if (!emailContact.emailChecked) {
      logger.error('Contribution could not be saved, Email is not activated')
      throw new Error('Contribution could not be saved, Email is not activated')
    }

    const event = new Event()
    const moderator = getUser(context)
    logger.trace('moderator: ', moderator.id)
    const creations = await getUserCreation(emailContact.userId, clientTimezoneOffset)
    logger.trace('creations:', creations)
    const creationDateObj = new Date(creationDate)
    logger.trace('creationDateObj:', creationDateObj)
    validateContribution(creations, amount, creationDateObj, clientTimezoneOffset)
    const contribution = DbContribution.create()
    contribution.userId = emailContact.userId
    contribution.amount = amount
    contribution.createdAt = new Date()
    contribution.contributionDate = creationDateObj
    contribution.memo = memo
    contribution.moderatorId = moderator.id
    contribution.contributionType = ContributionType.ADMIN
    contribution.contributionStatus = ContributionStatus.PENDING

    logger.trace('contribution to save', contribution)

    await DbContribution.save(contribution)

    const eventAdminCreateContribution = new EventAdminContributionCreate()
    eventAdminCreateContribution.userId = moderator.id
    eventAdminCreateContribution.amount = amount
    eventAdminCreateContribution.contributionId = contribution.id
    await eventProtocol.writeEvent(
      event.setEventAdminContributionCreate(eventAdminCreateContribution),
    )

    return getUserCreation(emailContact.userId, clientTimezoneOffset)
  }

  @Authorized([RIGHTS.ADMIN_CREATE_CONTRIBUTIONS])
  @Mutation(() => AdminCreateContributions)
  async adminCreateContributions(
    @Arg('pendingCreations', () => [AdminCreateContributionArgs])
    contributions: AdminCreateContributionArgs[],
    @Ctx() context: Context,
  ): Promise<AdminCreateContributions> {
    let success = false
    const successfulContribution: string[] = []
    const failedContribution: string[] = []
    for (const contribution of contributions) {
      await this.adminCreateContribution(contribution, context)
        .then(() => {
          successfulContribution.push(contribution.email)
          success = true
        })
        .catch(() => {
          failedContribution.push(contribution.email)
        })
    }
    return {
      success,
      successfulContribution,
      failedContribution,
    }
  }

  @Authorized([RIGHTS.ADMIN_UPDATE_CONTRIBUTION])
  @Mutation(() => AdminUpdateContribution)
  async adminUpdateContribution(
    @Args() { id, email, amount, memo, creationDate }: AdminUpdateContributionArgs,
    @Ctx() context: Context,
  ): Promise<AdminUpdateContribution> {
    const clientTimezoneOffset = getClientTimezoneOffset(context)
    const emailContact = await UserContact.findOne({
      where: { email },
      withDeleted: true,
      relations: ['user'],
    })
    if (!emailContact) {
      logger.error(`Could not find UserContact with email: ${email}`)
      throw new Error(`Could not find UserContact with email: ${email}`)
    }
    const user = emailContact.user
    if (!user) {
      logger.error(`Could not find User to emailContact: ${email}`)
      throw new Error(`Could not find User to emailContact: ${email}`)
    }
    if (user.deletedAt) {
      logger.error(`User was deleted (${email})`)
      throw new Error(`User was deleted (${email})`)
    }

    const moderator = getUser(context)

    const contributionToUpdate = await DbContribution.findOne({
      where: { id, confirmedAt: IsNull() },
    })
    if (!contributionToUpdate) {
      logger.error('No contribution found to given id.')
      throw new Error('No contribution found to given id.')
    }

    if (contributionToUpdate.userId !== user.id) {
      logger.error('user of the pending contribution and send user does not correspond')
      throw new Error('user of the pending contribution and send user does not correspond')
    }

    if (contributionToUpdate.moderatorId === null) {
      logger.error('An admin is not allowed to update a user contribution.')
      throw new Error('An admin is not allowed to update a user contribution.')
    }

    const creationDateObj = new Date(creationDate)
    let creations = await getUserCreation(user.id, clientTimezoneOffset)

    if (contributionToUpdate.contributionDate.getMonth() === creationDateObj.getMonth()) {
      creations = updateCreations(creations, contributionToUpdate, clientTimezoneOffset)
    } else {
      logger.error('Currently the month of the contribution cannot change.')
      throw new Error('Currently the month of the contribution cannot change.')
    }

    // all possible cases not to be true are thrown in this function
    validateContribution(creations, amount, creationDateObj, clientTimezoneOffset)
    contributionToUpdate.amount = amount
    contributionToUpdate.memo = memo
    contributionToUpdate.contributionDate = new Date(creationDate)
    contributionToUpdate.moderatorId = moderator.id
    contributionToUpdate.contributionStatus = ContributionStatus.PENDING

    await DbContribution.save(contributionToUpdate)

    const result = new AdminUpdateContribution()
    result.amount = amount
    result.memo = contributionToUpdate.memo
    result.date = contributionToUpdate.contributionDate

    result.creation = await getUserCreation(user.id, clientTimezoneOffset)

    const event = new Event()
    const eventAdminContributionUpdate = new EventAdminContributionUpdate()
    eventAdminContributionUpdate.userId = user.id
    eventAdminContributionUpdate.amount = amount
    eventAdminContributionUpdate.contributionId = contributionToUpdate.id
    await eventProtocol.writeEvent(
      event.setEventAdminContributionUpdate(eventAdminContributionUpdate),
    )

    return result
  }

  @Authorized([RIGHTS.LIST_UNCONFIRMED_CONTRIBUTIONS])
  @Query(() => [UnconfirmedContribution])
  async listUnconfirmedContributions(@Ctx() context: Context): Promise<UnconfirmedContribution[]> {
    const clientTimezoneOffset = getClientTimezoneOffset(context)
    const contributions = await getConnection()
      .createQueryBuilder()
      .select('c')
      .from(DbContribution, 'c')
      .leftJoinAndSelect('c.messages', 'm')
      .where({ confirmedAt: IsNull() })
      .getMany()

    if (contributions.length === 0) {
      return []
    }

    const userIds = contributions.map((p) => p.userId)
    const userCreations = await getUserCreations(userIds, clientTimezoneOffset)
    const users = await DbUser.find({
      where: { id: In(userIds) },
      withDeleted: true,
      relations: ['emailContact'],
    })

    return contributions.map((contribution) => {
      const user = users.find((u) => u.id === contribution.userId)
      const creation = userCreations.find((c) => c.id === contribution.userId)

      return new UnconfirmedContribution(
        contribution,
        user,
        creation ? creation.creations : FULL_CREATION_AVAILABLE,
      )
    })
  }

  @Authorized([RIGHTS.ADMIN_DELETE_CONTRIBUTION])
  @Mutation(() => Boolean)
  async adminDeleteContribution(
    @Arg('id', () => Int) id: number,
    @Ctx() context: Context,
  ): Promise<boolean> {
    const contribution = await DbContribution.findOne(id)
    if (!contribution) {
      logger.error(`Contribution not found for given id: ${id}`)
      throw new Error('Contribution not found for given id.')
    }
    const moderator = getUser(context)
    if (
      contribution.contributionType === ContributionType.USER &&
      contribution.userId === moderator.id
    ) {
      throw new Error('Own contribution can not be deleted as admin')
    }
    const user = await DbUser.findOneOrFail(
      { id: contribution.userId },
      { relations: ['emailContact'] },
    )
    contribution.contributionStatus = ContributionStatus.DELETED
    contribution.deletedBy = moderator.id
    await contribution.save()
    const res = await contribution.softRemove()

    const event = new Event()
    const eventAdminContributionDelete = new EventAdminContributionDelete()
    eventAdminContributionDelete.userId = contribution.userId
    eventAdminContributionDelete.amount = contribution.amount
    eventAdminContributionDelete.contributionId = contribution.id
    await eventProtocol.writeEvent(
      event.setEventAdminContributionDelete(eventAdminContributionDelete),
    )
    sendContributionRejectedEmail({
      senderFirstName: moderator.firstName,
      senderLastName: moderator.lastName,
      recipientEmail: user.emailContact.email,
      recipientFirstName: user.firstName,
      recipientLastName: user.lastName,
      contributionMemo: contribution.memo,
      contributionAmount: contribution.amount,
      overviewURL: CONFIG.EMAIL_LINK_OVERVIEW,
    })

    return !!res
  }

  @Authorized([RIGHTS.CONFIRM_CONTRIBUTION])
  @Mutation(() => Boolean)
  async confirmContribution(
    @Arg('id', () => Int) id: number,
    @Ctx() context: Context,
  ): Promise<boolean> {
    const clientTimezoneOffset = getClientTimezoneOffset(context)
    const contribution = await DbContribution.findOne(id)
    if (!contribution) {
      logger.error(`Contribution not found for given id: ${id}`)
      throw new Error('Contribution not found to given id.')
    }
    const moderatorUser = getUser(context)
    if (moderatorUser.id === contribution.userId) {
      logger.error('Moderator can not confirm own contribution')
      throw new Error('Moderator can not confirm own contribution')
    }
    const user = await DbUser.findOneOrFail(
      { id: contribution.userId },
      { withDeleted: true, relations: ['emailContact'] },
    )
    if (user.deletedAt) {
      logger.error('This user was deleted. Cannot confirm a contribution.')
      throw new Error('This user was deleted. Cannot confirm a contribution.')
    }
    const creations = await getUserCreation(contribution.userId, clientTimezoneOffset, false)
    validateContribution(
      creations,
      contribution.amount,
      contribution.contributionDate,
      clientTimezoneOffset,
    )

    const receivedCallDate = new Date()

    const queryRunner = getConnection().createQueryRunner()
    await queryRunner.connect()
    await queryRunner.startTransaction('REPEATABLE READ') // 'READ COMMITTED')
    try {
      const lastTransaction = await queryRunner.manager
        .createQueryBuilder()
        .select('transaction')
        .from(DbTransaction, 'transaction')
        .where('transaction.userId = :id', { id: contribution.userId })
        .orderBy('transaction.balanceDate', 'DESC')
        .getOne()
      logger.info('lastTransaction ID', lastTransaction ? lastTransaction.id : 'undefined')

      let newBalance = new Decimal(0)
      let decay: Decay | null = null
      if (lastTransaction) {
        decay = calculateDecay(
          lastTransaction.balance,
          lastTransaction.balanceDate,
          receivedCallDate,
        )
        newBalance = decay.balance
      }
      newBalance = newBalance.add(contribution.amount.toString())

      const transaction = new DbTransaction()
      transaction.typeId = TransactionTypeId.CREATION
      transaction.memo = contribution.memo
      transaction.userId = contribution.userId
      transaction.previous = lastTransaction ? lastTransaction.id : null
      transaction.amount = contribution.amount
      transaction.creationDate = contribution.contributionDate
      transaction.balance = newBalance
      transaction.balanceDate = receivedCallDate
      transaction.decay = decay ? decay.decay : new Decimal(0)
      transaction.decayStart = decay ? decay.start : null
      await queryRunner.manager.insert(DbTransaction, transaction)

      contribution.confirmedAt = receivedCallDate
      contribution.confirmedBy = moderatorUser.id
      contribution.transactionId = transaction.id
      contribution.contributionStatus = ContributionStatus.CONFIRMED
      await queryRunner.manager.update(DbContribution, { id: contribution.id }, contribution)

      await queryRunner.commitTransaction()
      logger.info('creation commited successfuly.')
      sendContributionConfirmedEmail({
        senderFirstName: moderatorUser.firstName,
        senderLastName: moderatorUser.lastName,
        recipientFirstName: user.firstName,
        recipientLastName: user.lastName,
        recipientEmail: user.emailContact.email,
        contributionMemo: contribution.memo,
        contributionAmount: contribution.amount,
        overviewURL: CONFIG.EMAIL_LINK_OVERVIEW,
      })
    } catch (e) {
      await queryRunner.rollbackTransaction()
      logger.error(`Creation was not successful: ${e}`)
      throw new Error(`Creation was not successful.`)
    } finally {
      await queryRunner.release()
    }

    const event = new Event()
    const eventContributionConfirm = new EventContributionConfirm()
    eventContributionConfirm.userId = user.id
    eventContributionConfirm.amount = contribution.amount
    eventContributionConfirm.contributionId = contribution.id
    await eventProtocol.writeEvent(event.setEventContributionConfirm(eventContributionConfirm))
    return true
  }

  @Authorized([RIGHTS.CREATION_TRANSACTION_LIST])
  @Query(() => ContributionListResult)
  async creationTransactionList(
    @Args()
    { currentPage = 1, pageSize = 25, order = Order.DESC }: Paginated,
    @Arg('userId', () => Int) userId: number,
  ): Promise<ContributionListResult> {
    const offset = (currentPage - 1) * pageSize
    const [contributionResult, count] = await getConnection()
      .createQueryBuilder()
      .select('c')
      .from(DbContribution, 'c')
      .leftJoinAndSelect('c.user', 'u')
      .where(`user_id = ${userId}`)
      .limit(pageSize)
      .offset(offset)
      .orderBy('c.created_at', order)
      .getManyAndCount()

    return new ContributionListResult(
      count,
      contributionResult.map((contribution) => new Contribution(contribution, contribution.user)),
    )
    // return userTransactions.map((t) => new Transaction(t, new User(user), communityUser))
  }
}