AWSTemplateFormatVersion: '2010-09-09'
Description: Lambda programada con Amazon EventBridge (Cron Jobs)

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

  # Rol de IAM que el Scheduler usará para ejecutar la Lambda
  SchedulerToLambdaRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: Allow
            Principal:
              Service: scheduler.amazonaws.com
            Action: sts:AssumeRole
      Policies:
        - PolicyName: ExecuteLambdaPolicy
          PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Effect: Allow
                Action: "lambda:InvokeFunction"
                Resource: !GetAtt MyScheduledLambda.Arn

  # ==================== FUNCIÓN LAMBDA ====================
  MyScheduledLambda:
    Type: AWS::Lambda::Function
    Properties:
      FunctionName: ScheduledLambda-Python
      Runtime: python3.12
      Role: !GetAtt LambdaExecutionRole.Arn
      Handler: index.lambda_handler
      Timeout: 60
      Code:
        ZipFile: |
          import json
          import logging
          from datetime import datetime

          logger = logging.getLogger()
          logger.setLevel(logging.INFO)

          def lambda_handler(event, context):
              logger.info("=== Lambda programada ejecutada por EventBridge ===")
              logger.info(f"Request ID: {context.aws_request_id}")
              logger.info(f"Evento recibido: {json.dumps(event, default=str)}")
              
              execution_time = datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S UTC")
              
              logger.info(f"Ejecución a las: {execution_time}")

              response_body = {
                  "mensaje": "¡Lambda ejecutada correctamente por EventBridge!",
                  "version": "Día 13",
                  "execution_time": execution_time,
                  "source": event.get("source", "aws.events")
              }
              
              logger.info("Tarea programada completada exitosamente")
              return {
                  "statusCode": 200,
                  "headers": {"Content-Type": "application/json"},
                  "body": json.dumps(response_body)
              }

  # ==================== REGLAS DE EVENTBRIDGE ====================

  # Programación para pruebas (cada 5 minutos)
  TestEvery5MinutesSchedule:
    Type: AWS::Scheduler::Schedule
    Properties:
      Name: Test-Lambda-Every5Minutes
      Description: Ejecuta cada 5 minutos usando el nuevo Scheduler
      ScheduleExpression: "rate(5 minutes)"
      State: ENABLED
      FlexibleTimeWindow:
        Mode: "OFF" # Ejecución exacta. Puedes poner "FLEXIBLE" para optimizar costos.
      Target:
        Arn: !GetAtt MyScheduledLambda.Arn
        RoleArn: !GetAtt SchedulerToLambdaRole.Arn

  # Programación diaria (Producción)
  DailySchedule:
    Type: AWS::Scheduler::Schedule
    Properties:
      Name: Daily-Lambda-At8AM
      Description: Ejecuta a las 8:00 AM usando zona horaria específica
      ScheduleExpression: "cron(0 8 * * ? *)"
      ScheduleExpressionTimezone: "UTC" # ¡Ahora puedes poner "America/Santiago" o similar!
      State: DISABLED
      FlexibleTimeWindow:
        Mode: "OFF"
      Target:
        Arn: !GetAtt MyScheduledLambda.Arn
        RoleArn: !GetAtt SchedulerToLambdaRole.Arn