AWSTemplateFormatVersion: 2010-09-09
Description: AppSync setup
Parameters:
  FunctionStack:
    Description: The stack name that deploys the Lambda functions to invoke.
    Type: String
Resources:
  DataSourceRole:
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
          - Action: sts:AssumeRole
            Effect: Allow
            Principal:
              Service: appsync.amazonaws.com
      Policies:
        - PolicyName: LambdaInvoker
          PolicyDocument:
            Version: 2012-10-17
            Statement:
              - Action: lambda:InvokeFunction
                Effect: Allow
                Resource:
                  - Fn::Join:
                    - ''
                    - - 'arn:aws:lambda:'
                      - !Ref AWS::Region
                      - ':'
                      - !Ref AWS::AccountId
                      - ':function:'
                      - Fn::ImportValue:
                          !Sub '${FunctionStack}-functions-SimilarProductRecommendation'
                  - Fn::Join:
                    - ''
                    - - 'arn:aws:lambda:'
                      - !Ref AWS::Region
                      - ':'
                      - !Ref AWS::AccountId
                      - ':function:'
                      - Fn::ImportValue:
                          !Sub '${FunctionStack}-functions-SimilarProductRecommendation'
                      - ':*'
      RoleName: !Sub '${AWS::StackName}-lambda-role'
  GqlApi:
    Type: AWS::AppSync::GraphQLApi
    Properties:
      AuthenticationType:  AWS_IAM
      Name: !Ref AWS::StackName
  GqlSchema:
    Type: AWS::AppSync::GraphQLSchema
    Properties:
      ApiId: !GetAtt GqlApi.ApiId
      Definition: |
        type Mutation {

        }

        type Query {

          getSimilarProductRecommendation(context: similarProductContext, productId: String, color: String, limit: Int, referer: String, abTestName: String, abTestVariant: String, cognitoIdentityId__: String): SimilarProductRecommendation

        }

        input PriceInput {
          now: String
          onSale: Boolean
          was: String
        }
        type Price {
          now: String! 
          onSale: Boolean! 
          was: String! 
        }
        input RecommendationInput {
          brandName: String
          numReviews: Int
          price: priceInput
          productId: String
          productImageUrl: String
          productName: String
          productUrl: String
          rating: Float
        }
        type Recommendation {
          brandName: String! 
          numReviews: Int
          price: price! 
          productId: String! 
          productImageUrl: String! 
          productName: String! 
          productUrl: String! 
          rating: Float
        }
        input SimilarProductRecommendationInput {
          recommendations: [recommendationInput]
        }
        type SimilarProductRecommendation {
          recommendations: [recommendation]! 
        }

        enum SimilarProductContext {
          PDP
        }

        schema {
          query: Query
          mutation: Mutation
        }
    DependsOn:
      - GqlApi
  SimilarProductRecommendationDataSource:
    Type: AWS::AppSync::DataSource
    Properties:
      ApiId: !GetAtt GqlApi.ApiId
      LambdaConfig:
        LambdaFunctionArn:
          Fn::Join:
            - ''
            - - 'arn:aws:lambda:'
              - !Ref AWS::Region
              - ':'
              - !Ref AWS::AccountId
              - ':function:'
              - Fn::ImportValue:
                  !Sub '${FunctionStack}-functions-SimilarProductRecommendation'
      Name: similar_product_recommendation_lambda
      ServiceRoleArn: !GetAtt DataSourceRole.Arn
      Type: AWS_LAMBDA
    DependsOn:
      - DataSourceRole
      - GqlApi
  GetSimilarProductRecommendationResolver:
    Type: AWS::AppSync::Resolver
    Properties:
      ApiId: !GetAtt GqlApi.ApiId
      FieldName: getSimilarProductRecommendation
      TypeName: Query
      DataSourceName: !GetAtt SimilarProductRecommendationDataSource.Name
      RequestMappingTemplate: |
        #set( $cognitoIdentityId = $context.identity.cognitoIdentityId )
        #if($context.identity.userArn.matches('arn:aws:iam::\d+:user/.*'))
          #if($context.args.cognitoIdentityId__)
            #set( $cognitoIdentityId = $context.args.cognitoIdentityId__ )
          #elseif( $context.source.cognitoIdentityId__ )
            #set( $cognitoIdentityId = $context.source.cognitoIdentityId__ )
          #end
        #end
        #set( $unamepwd = "$util.urlEncode($cognitoIdentityId):" )
        {
          "version" : "2017-02-28",
          "operation": "Invoke",
          "payload": {
            "source": "AppSync",
            "httpMethod": "get",
            "headers": {
              "Authorization": "Basic $util.base64Encode($unamepwd)",
              "Referer": "$util.escapeJavaScript($context.args.referer)"
            },
            "pathParameters": {
              "context": "$util.escapeJavaScript($context.args.context)",
              "productId": "$util.escapeJavaScript($context.args.productId)"
            },
            "queryStringParameters": {
              "abTestName": "$util.escapeJavaScript($context.args.abTestName)",
              "abTestVariant": "$util.escapeJavaScript($context.args.abTestVariant)",
              "color": "$util.escapeJavaScript($context.args.color)",
              "limit": "$util.escapeJavaScript($context.args.limit)"
            }
          }
        }
      ResponseMappingTemplate: |
        #if($context.result.statusCode >= 200 && $context.result.statusCode <= 299)
          #set( $result = $util.parseJson($context.result.body) )
          #if($context.args.cognitoIdentityId__)
            #set( $result.cognitoIdentityId__ = $context.args.cognitoIdentityId__ )
          #elseif($context.source.cognitoIdentityId__)
            #set( $result.cognitoIdentityId__ = $context.source.cognitoIdentityId__ )
          #end
          $util.toJson($result)
        #else
          $utils.error($util.parseJson($context.result.body).message, $context.result.statusCode.toString(), $util.parseJson($context.result.body))
        #end
    DependsOn:
      - GqlApi
      - GqlSchema
      - SimilarProductRecommendationDataSource
Outputs:
  ApiEndpoint:
    Description: The endpoint for the AppSync API.
    Value: !GetAtt GqlApi.GraphQLUrl