AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: Serverless patterns - REST API regional with Lambda proxy integration

Resources:
#Lambda function
  LambdaRegionalApi:
    Type: AWS::Serverless::Function 
    Properties:
      Handler: index.lambda_handler
      InlineCode: |
        import json
        def lambda_handler(event, context):
            return {
        "statusCode": 200,
        "body": json.dumps({
          "message" : "Hello World! This is the regional API"}),
        }
      Runtime: python3.9
      Events:
        HelloWorld:
          Type: Api 
          Properties: 
            Path: /
            Method: get
            RestApiId:
              Ref: ApiRegional
              
  #REST Regional API
  ApiRegional:
    Type: AWS::Serverless::Api
    Properties:
      StageName: prod
      EndpointConfiguration: REGIONAL

# Output with API URL
Outputs:
  EndpointUrl:
    Description: 'REST regional endpoint URL'
    Value: !Sub 'https://${ApiRegional}.execute-api.${AWS::Region}.amazonaws.com/prod'