export default client => {
  const create = user => {
    return new Promise((resolve, reject) => {
      client.put({
        TableName: 'users',
        Item: user
      }, (err, data) => {
        if (err) {
          return reject(err)
        }
        resolve()
      })
    })
  }

  const getById = userId => {
    return new Promise((resolve, reject) => {
      client.query({
        TableName: 'users',
        KeyConditionExpression: '#userId = :userId',
        ExpressionAttributeNames: {
          '#userId': 'userId'
        },
        ExpressionAttributeValues: {
          ':userId': userId
        }
      }, (err, data) => {
        if (err) {
          return reject(err)
        }
        if (!data.Items.length) {
          return reject(new UserNotFoundException())
        }
        resolve(data.Items[0])
      })
    })
  }

  const save = user => {
    return new Promise((resolve, reject) => {
      client.put({
        TableName: 'users',
        Item: user
      }, (err, data) => {
        if (err) {
          return reject(err)
        }
        resolve()
      })
    })
  }

  return {
    create,
    getById,
    save
  }
}