AWSTemplateFormatVersion: '2010-09-09'
Description: AWS Lambda + Amazon API Gateway

Resources:
  # ==================== ROL IAM ====================
  LambdaExecutionRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: '2012-10-17'
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: sts:AssumeRole
      ManagedPolicyArns:
        - arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole

  # ==================== FUNCIÓN LAMBDA ====================
  MiPrimeraLambdaPython:
    Type: AWS::Lambda::Function
    Properties:
      FunctionName: MiPrimeraAPILambda-Python
      Runtime: python3.12
      Role: !GetAtt LambdaExecutionRole.Arn
      Handler: index.lambda_handler
      Timeout: 30
      Code:
        ZipFile: |
          import json

          def lambda_handler(event, context):
              print("Evento recibido desde API Gateway:", json.dumps(event, indent=2))
              
              response_body = {
                  'mensaje': '¡Hola desde mi primera API con Lambda y API Gateway! 🚀',
                  'version': 'Día 10',
                  'request_id': context.aws_request_id,
                  'path': event.get('requestContext', {}).get('http', {}).get('path', '/')
              }
              
              return {
                  'statusCode': 200,
                  'headers': {
                      'Content-Type': 'application/json',
                      'Access-Control-Allow-Origin': '*'   # Para permitir CORS (útil en desarrollo)
                  },
                  'body': json.dumps(response_body)
              }


  MiAPI:
    Type: AWS::ApiGatewayV2::Api
    Properties:
      Name: MiPrimeraAPI
      ProtocolType: HTTP
      Target: !Sub "arn:aws:lambda:${AWS::Region}:${AWS::AccountId}:function:${MiPrimeraLambdaPython}"

  MiStage:
    Type: AWS::ApiGatewayV2::Stage
    Properties:
      ApiId: !Ref MiAPI
      StageName: prod
      AutoDeploy: true

  AllowAPIGatewayToInvokeLambda:
    Type: AWS::Lambda::Permission
    Properties:
      FunctionName: !Ref MiPrimeraLambdaPython
      Action: lambda:InvokeFunction
      Principal: apigateway.amazonaws.com
      SourceArn: !Sub "arn:aws:execute-api:${AWS::Region}:${AWS::AccountId}:${MiAPI}/*"


Outputs:
  LambdaFunctionNamePython:
    Value: !Ref MiPrimeraLambdaPython
    Description: Nombre de la función Lambda en Python
  ApiEndpoint:
    Value: !Sub "https://${MiAPI}.execute-api.${AWS::Region}.amazonaws.com/prod/"
    Description: URL de la API Gateway para invocar la función Lambda