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const AWS = require('aws-sdk');

// Create the DynamoDB Client with the region you want
const region = 'us-east-1';
const dynamoDbClient = createDynamoDbClient(region);

// Create the input for query call
const queryInput = createQueryInput();

 // Call DynamoDB's query API
executeQuery(dynamoDbClient, queryInput).then(() => {
    console.info('Query API call has been executed.')
  }
);

function createDynamoDbClient(regionName) {
  // Set the region
  AWS.config.update({region: regionName});
  // Use the following config instead when using DynamoDB local
  // AWS.config.update({region: 'localhost', endpoint: 'http://localhost:8000', accessKeyId: 'access_key_id', secretAccessKey: 'secret_access_key'});
  return new AWS.DynamoDB();
}

function createQueryInput() {
  return {
    "TableName": "Pemint_Dev_Transactions",
    "ScanIndexForward": true,
    "ReturnConsumedCapacity": "TOTAL",
    "IndexName": "Partner_ID-CreatedAt-index",
    "KeyConditionExpression": "#4c0a0 = :4c0a0 And #4c0a1 BETWEEN :4c0a1 AND :4c0a2",
    "ExpressionAttributeValues": {
      ":4c0a0": {
        "S": "1234"
      },
      ":4c0a1": {
        "S": "21-12-2023"
      },
      ":4c0a2": {
        "S": "22-12-2023"
      }
    },
    "ExpressionAttributeNames": {
      "#4c0a0": "Partner_ID",
      "#4c0a1": "CreatedAt"
    }
  }
}

async function executeQuery(dynamoDbClient, queryInput) {
  // Call DynamoDB's query API
  try {
    const queryOutput = await dynamoDbClient.query(queryInput).promise();
    console.info('Query successful.');
    // Handle queryOutput
  } catch (err) {
    handleQueryError(err);
  }
}

// Handles errors during Query execution. Use recommendations in error messages below to 
// add error handling specific to your application use-case. 
function handleQueryError(err) {
  if (!err) {
    console.error('Encountered error object was empty');
    return;
  }
  if (!err.code) {
    console.error(`An exception occurred, investigate and configure retry strategy. Error: ${JSON.stringify(err)}`);
    return;
  }
  // here are no API specific errors to handle for Query, common DynamoDB API errors are handled below
  handleCommonErrors(err);
}

function handleCommonErrors(err) {
  switch (err.code) {
    case 'InternalServerError':
      console.error(`Internal Server Error, generally safe to retry with exponential back-off. Error: ${err.message}`);
      return;
    case 'ProvisionedThroughputExceededException':
      console.error(`Request rate is too high. If you're using a custom retry strategy make sure to retry with exponential back-off. `
        + `Otherwise consider reducing frequency of requests or increasing provisioned capacity for your table or secondary index. Error: ${err.message}`);
      return;
    case 'ResourceNotFoundException':
      console.error(`One of the tables was not found, verify table exists before retrying. Error: ${err.message}`);
      return;
    case 'ServiceUnavailable':
      console.error(`Had trouble reaching DynamoDB. generally safe to retry with exponential back-off. Error: ${err.message}`);
      return;
    case 'ThrottlingException':
      console.error(`Request denied due to throttling, generally safe to retry with exponential back-off. Error: ${err.message}`);
      return;
    case 'UnrecognizedClientException':
      console.error(`The request signature is incorrect most likely due to an invalid AWS access key ID or secret key, fix before retrying. `
        + `Error: ${err.message}`);
      return;
    case 'ValidationException':
      console.error(`The input fails to satisfy the constraints specified by DynamoDB, `
        + `fix input before retrying. Error: ${err.message}`);
      return;
    case 'RequestLimitExceeded':
      console.error(`Throughput exceeds the current throughput limit for your account, `
        + `increase account level throughput before retrying. Error: ${err.message}`);
      return;
    default:
      console.error(`An exception occurred, investigate and configure retry strategy. Error: ${err.message}`);
      return;
  }
}
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