AWSTemplateFormatVersion: "2010-09-09"
Description: "My API Gateway and Lambda function"

Parameters:
  apiGatewayStageName:
    Type: "String"
    AllowedPattern: "^[a-z0-9]+$"
    Default: "call"

  lambdaFunctionName:
    Type: "String"
    AllowedPattern: "^[a-zA-Z0-9]+[a-zA-Z0-9-]+[a-zA-Z0-9]+$"
    Default: "GetSongs"

  S3Bucketname:
    Type: "String"
    AllowedPattern: "^[a-zA-Z0-9]+[a-zA-Z0-9-]+[a-zA-Z0-9]+$"
    Default: "Rhythmcloud"

Resources:
  apiGateway:
    Type: "AWS::ApiGateway::RestApi"
    Properties:
      Name: "drum-instructor"
      Description: "Rhythmcloud Drum Instructor API"
  ListSongs:
    Type: 'AWS::ApiGateway::Resource'
    Properties:
      RestApiId: !Ref apiGateway
      PathPart: "songs"
      ParentId: !GetAtt "apiGateway.RootResourceId"
    Metadata:
      'AWS::CloudFormation::Designer':
        id: cc6c3940-2889-423b-be87-868ff11f0a23

  apiGatewayRootMethod:
    Type: "AWS::ApiGateway::Method"
    Properties:
      AuthorizationType: "NONE"
      HttpMethod: "GET"
      Integration:
        IntegrationHttpMethod: "GET"
        Type: "AWS_PROXY"
        Uri: !Sub
          - "arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${lambdaArn}/invocations"
          - lambdaArn: !GetAtt "lambdaFunction.Arn"
#      ResourceId: !GetAtt "apiGateway.RootResourceId"
      ResourceId: !Ref
        - "ListSongs"
        - "apiGateway"
      RestApiId: !Ref "apiGateway"
      OperationName: "ListSongs"

  apiGatewayDeployment:
    Type: "AWS::ApiGateway::Deployment"
    DependsOn:
      - "apiGatewayRootMethod"
    Properties:
      RestApiId: !Ref "apiGateway"
      StageName: !Ref "apiGatewayStageName"

  lambdaFunction:
    Type: "AWS::Lambda::Function"
    Properties:
      Code:
        ZipFile: |
          def handler(event,context):
            return {
              'body': 'Hello there {0}'.format(event['requestContext']['identity']['sourceIp']),
              'headers': {
                'Content-Type': 'text/plain'
              },
              'statusCode': 200
            }
      Description: "My function"
      FunctionName: !Ref "lambdaFunctionName"
      Handler: "index.handler"
      MemorySize: 128
      Role: !GetAtt "lambdaIAMRole.Arn"
      Runtime: "python2.7"
      Timeout: 10

  lambdaApiGatewayInvoke:
    Type: "AWS::Lambda::Permission"
    Properties:
      Action: "lambda:InvokeFunction"
      FunctionName: !GetAtt "lambdaFunction.Arn"
      Principal: "apigateway.amazonaws.com"
      SourceArn: !Sub "arn:aws:execute-api:${AWS::Region}:${AWS::AccountId}:${apiGateway}/*/POST/"

  lambdaIAMRole:
    Type: "AWS::IAM::Role"
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Action:
              - "sts:AssumeRole"
            Effect: "Allow"
            Principal:
              Service:
                - "lambda.amazonaws.com"
      Policies:
        - PolicyDocument:
            Version: "2012-10-17"
            Statement:
              - Action:
                  - "logs:CreateLogGroup"
                  - "logs:CreateLogStream"
                  - "logs:PutLogEvents"
                Effect: "Allow"
                Resource:
                  - !Sub "arn:aws:logs:${AWS::Region}:${AWS::AccountId}:log-group:/aws/lambda/${lambdaFunctionName}:*"
          PolicyName: "lambda"

  lambdaLogGroup:
    Type: "AWS::Logs::LogGroup"
    Properties:
      LogGroupName: !Sub "/aws/lambda/${lambdaFunctionName}"
      RetentionInDays: 90



Outputs:
  apiGatewayInvokeURL:
    Value: !Sub "https://${apiGateway}.execute-api.${AWS::Region}.amazonaws.com/${apiGatewayStageName}"

  lambdaArn:
    Value: !GetAtt "lambdaFunction.Arn"