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console.log('Loading function');

var AWS = require('aws-sdk');
var dynamo = new AWS.DynamoDB.DocumentClient();
 


exports.handler = async  (event, context, callback) =>
{
    console.log('Received event:', JSON.stringify(event, null, 2));

    var operation = event.operation;

    if (event.tableName)
    {
        event.payload.TableName = event.tableName;
    }

    switch (operation)
    {
        case 'create':
            dynamo.put(event.payload, callback);
            break;
        case 'read':
            dynamo.get(event.payload, callback);
            break;
        case 'update':
            dynamo.update(event.payload, callback);
            break;
        case 'delete':
            dynamo.delete(event.payload, callback);
            break;
        case 'list':
            dynamo.scan(event.payload, callback);

            break;

       
        case 'ping':
            callback(null, 'pong');
            break;
        default:
            callback('Unknown operation: ${operation}' + JSON.stringify(event));
    }
};