'use strict'

const awsRequest = require('@serverless/test/aws-request')
const SNSService = require('aws-sdk').SNS

async function createSnsTopic(topicName) {
  const params = {
    Name: topicName,
  }

  return awsRequest(SNSService, 'createTopic', params)
}

async function resolveTopicArn(topicName, nextToken = null) {
  return awsRequest(SNSService, 'listTopics', { NextToken: nextToken }).then(
    (data) => {
      const targetTopic = data.Topics.find((topic) =>
        RegExp(topicName, 'g').test(topic.TopicArn),
      )

      if (targetTopic) return targetTopic.TopicArn

      if (data.NextToken) return resolveTopicArn(topicName, data.NextToken)
      return null
    },
  )
}

async function removeSnsTopic(topicName) {
  return resolveTopicArn(topicName).then((topicArn) => {
    const params = {
      TopicArn: topicArn,
    }

    return awsRequest(SNSService, 'deleteTopic', params)
  })
}

async function publishSnsMessage(topicName, message, messageAttributes = null) {
  return resolveTopicArn(topicName).then((topicArn) => {
    const params = {
      Message: message,
      TopicArn: topicArn,
    }
    if (messageAttributes) {
      params.MessageAttributes = messageAttributes
    }

    return awsRequest(SNSService, 'publish', params)
  })
}

module.exports = {
  createSnsTopic,
  removeSnsTopic,
  publishSnsMessage,
}