# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: MIT-0

AWSTemplateFormatVersion: '2010-09-09'
Description:  This template configures cross-region peering. Infrastructure with Transit Gateway must be in place already

Parameters:

  TransitGatewayPeeringAttachmentID:
    Description: Transit Gateway Peering Attachment ID
    Type: String

  InrastructureStackName:
    Description: Core infrastructure stack name
    Type: String
    Default: private-api-infrastructure

  EnvironmentName:
    Description: An environment name that is prefixed to resource names
    Type: String
    Default: private-api-tgw-peering

Mappings:
    DeploymentRegionMap:
      us-east-1:
        TransitGatewayCrossRegionRouteCIDR: 10.2.0.0/16
        CrossRegionID: us-west-2
      us-west-2:
        TransitGatewayCrossRegionRouteCIDR: 10.1.0.0/16
        CrossRegionID: us-east-1

Resources:

  TransitGatewayPeeringRoute:
    Type: AWS::EC2::TransitGatewayRoute
    Properties: 
      Blackhole: false
      DestinationCidrBlock: !FindInMap [DeploymentRegionMap, !Ref "AWS::Region", TransitGatewayCrossRegionRouteCIDR]
      TransitGatewayAttachmentId: !Ref TransitGatewayPeeringAttachmentID
      TransitGatewayRouteTableId: !ImportValue 
        'Fn::Sub': '${InrastructureStackName}:TransitGatewayRouteTable'

  TransitGatewayPeeringRouteTableAssociation:
    Type: AWS::EC2::TransitGatewayRouteTableAssociation
    Properties: 
      TransitGatewayAttachmentId: !Ref TransitGatewayPeeringAttachmentID
      TransitGatewayRouteTableId:  !ImportValue 
        'Fn::Sub': '${InrastructureStackName}:TransitGatewayRouteTable'