# PowerShell script file to be executed as a AWS Lambda function.
#
# When executing in Lambda the following variables will be predefined.
#   $LambdaInput - A PSObject that contains the Lambda function input data.
#   $LambdaContext - An Amazon.Lambda.Core.ILambdaContext object that contains information about the currently running Lambda environment.
#
# The last item in the PowerShell pipeline will be returned as the result of the Lambda function.
#
# To include PowerShell modules with your Lambda function, like the AWS.Tools.S3 module, add a "#Requires" statement
# indicating the module and version. If using an AWS.Tools.* module the AWS.Tools.Common module is also required.

#Requires -Modules @{ModuleName='AWS.Tools.Common';ModuleVersion='4.0.6.0'}

# Uncomment to send the input event to CloudWatch Logs
# Write-Host (ConvertTo-Json -InputObject $LambdaInput -Compress -Depth 5)

# Your logic goes here

function Write-HelloWorld {

    $result = @{
        "message" = "hello world"
    }

    if ($null -ne $LambdaInput.requestContext.apiId) {
        # https://aws.amazon.com/blogs/developer/creating-a-powershell-rest-api/
        # API Gateway Response needs to be in a very specific format
        return @{
            'statusCode' = 200;
            'body'       = $result | ConvertTo-Json
            'headers'    = @{'Content-Type' = 'application/json' }
        }
    }
    else {
        # if invoking the lambda without API Gateway a normal response can be returned
        return $result
    }

}