AWSTemplateFormatVersion: "2010-09-09"
Description: (AWS Heidi) webhook stack for REST API Gateway to EventBridge

Parameters:
  EventHealthBusArn:
    Type: String
    Description: EventHealthBusArn

Resources:
  ApiGatewayEventBridgeRole:
    Type: AWS::IAM::Role
    Properties:
      RoleName: !Sub "EventHealthApiGW-${AWS::AccountId}-${AWS::Region}-Role"
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Sid: AllowApiGatewayServiceToAssumeRole
            Effect: Allow
            Action:
              - 'sts:AssumeRole'
            Principal:
              Service:
                - apigateway.amazonaws.com
      Policies:
        - PolicyName: EBPutEvents
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Effect: Allow
                Action:
                  - 'events:PutEvents'
                Resource:
                  - !Ref EventHealthBusArn
  
  apiGateway:
    Type: AWS::ApiGateway::RestApi
    Properties:
      EndpointConfiguration:
        Types:
          - REGIONAL
      Name: !Sub EventHealth-${AWS::AccountId}-${AWS::Region}-api

  apiGatewayRootMethod:
    Type: AWS::ApiGateway::Method
    Properties:
      AuthorizationType: NONE
      HttpMethod: POST
      MethodResponses:
        - StatusCode: 200
          ResponseModels:
            application/json: Empty
      RequestParameters: 
        method.request.header.X-Amz-Target: false
        method.request.header.Content-Type: false
      Integration:
        IntegrationHttpMethod: POST
        Type: AWS
        Credentials: !GetAtt ApiGatewayEventBridgeRole.Arn 
        Uri: !Sub arn:aws:apigateway:${AWS::Region}:events:action/PutEvents
        PassthroughBehavior: WHEN_NO_TEMPLATES
        RequestTemplates: 
          application/json: !Sub 
            - |- 
              #set($context.requestOverride.header.X-Amz-Target = "AWSEvents.PutEvents")
              #set($context.requestOverride.header.Content-Type = "application/x-amz-json-1.1")
              {
                "Entries": [
                  {
                    "Detail": "$util.escapeJavaScript($input.json('$.Detail'))",
                    "DetailType": "awshealthtest",
                    "EventBusName": "default",
                    "Source": $input.json('$.source')
                  }
                ]
              }
            - EventBusName: !Select [1, !Split ["/", !Ref EventHealthBusArn]]
        IntegrationResponses:
          - StatusCode: 200
      ResourceId: !GetAtt apiGateway.RootResourceId
      RestApiId: !Ref apiGateway

  apiGatewayDeployment:
    Type: AWS::ApiGateway::Deployment
    DependsOn:
      - apiGatewayRootMethod
    Properties:
      RestApiId: !Ref apiGateway
      StageName: 'v1'
      
Outputs:
  ApiEndpoint: 
    Description: "API Gateway endpoint URL for Prod stage for Product api"
    Value: !Sub "https://${apiGateway}.execute-api.${AWS::Region}.amazonaws.com/v1/"