import memoizee from 'memoizee'
import naming from '../lib/naming.js'

const resolveLambdaTarget = memoizee((functionName, functionObject) => {
  const lambdaLogicalId = naming.getLambdaLogicalId(functionName)
  const functionArnGetter = { 'Fn::GetAtt': [lambdaLogicalId, 'Arn'] }
  if (!functionObject.targetAlias) return functionArnGetter
  return {
    'Fn::Join': [':', [functionArnGetter, functionObject.targetAlias.name]],
  }
})

export default resolveLambdaTarget