'use strict'

const { addPermission, removePermission } = require('./lib/permissions')
const {
  updateConfiguration,
  removeConfiguration,
  findUserPoolByName,
} = require('./lib/user-pool')
const { getEnvironment, getLambdaArn, handlerWrapper } = require('../utils')

async function handler(event, context) {
  if (event.RequestType === 'Create') {
    return create(event, context)
  } else if (event.RequestType === 'Update') {
    return update(event, context)
  } else if (event.RequestType === 'Delete') {
    return remove(event, context)
  }
  throw new Error(`Unhandled RequestType ${event.RequestType}`)
}

async function create(event, context) {
  const { FunctionName, UserPoolName, UserPoolConfigs } =
    event.ResourceProperties
  const { Partition, Region, AccountId } = getEnvironment(context)

  const lambdaArn = getLambdaArn(Partition, Region, AccountId, FunctionName)

  return findUserPoolByName({
    userPoolName: UserPoolName,
    region: Region,
  }).then((userPool) =>
    addPermission({
      functionName: FunctionName,
      userPoolName: UserPoolName,
      partition: Partition,
      region: Region,
      accountId: AccountId,
      userPoolId: userPool.Id,
    }).then(() =>
      updateConfiguration({
        lambdaArn,
        userPoolName: UserPoolName,
        userPoolConfigs: UserPoolConfigs,
        region: Region,
      }),
    ),
  )
}

async function update(event, context) {
  const { Partition, Region, AccountId } = getEnvironment(context)
  const { FunctionName, UserPoolName, UserPoolConfigs } =
    event.ResourceProperties

  const lambdaArn = getLambdaArn(Partition, Region, AccountId, FunctionName)

  return updateConfiguration({
    lambdaArn,
    userPoolName: UserPoolName,
    userPoolConfigs: UserPoolConfigs,
    region: Region,
  })
}

async function remove(event, context) {
  const { Partition, Region, AccountId } = getEnvironment(context)
  const { FunctionName, UserPoolName } = event.ResourceProperties

  const lambdaArn = getLambdaArn(Partition, Region, AccountId, FunctionName)

  return removePermission({
    functionName: FunctionName,
    userPoolName: UserPoolName,
    region: Region,
  }).then(() =>
    removeConfiguration({
      lambdaArn,
      userPoolName: UserPoolName,
      region: Region,
    }),
  )
}

module.exports = {
  handler: handlerWrapper(handler, 'CustomResourceExistingCognitoUserPool'),
}