Root Path - Lambda

## API Gateway
resource "aws_api_gateway_rest_api" "apigw" {
    name = "<env>"
}

# Method
resource "aws_api_gateway_method" "GET" {
  rest_api_id = aws_api_gateway_rest_api.apigw.id
  resource_id = aws_api_gateway_rest_api.apigw.root_resource_id
  authorization = "NONE"
  http_method = "GET"
}

resource "aws_api_gateway_method" "POST" {
  rest_api_id = aws_api_gateway_rest_api.apigw.id
  resource_id = aws_api_gateway_rest_api.apigw.root_resource_id
  authorization = "NONE"
  http_method = "POST"
}

# API Gateway Intergration
resource "aws_api_gateway_integration" "api_GET" {
  http_method = aws_api_gateway_method.GET.http_method
  resource_id = aws_api_gateway_rest_api.apigw.root_resource_id
  rest_api_id = aws_api_gateway_rest_api.apigw.id
  integration_http_method = "GET"
  type = "AWS"
  uri = aws_lambda_function.lambda.invoke_arn
  credentials = aws_iam_role.apigw.arn
}

resource "aws_api_gateway_integration" "api_POST" {
  http_method = aws_api_gateway_method.POST.http_method
  resource_id = aws_api_gateway_rest_api.apigw.root_resource_id
  rest_api_id = aws_api_gateway_rest_api.apigw.id
  integration_http_method = "POST"
  type = "AWS"
  uri = aws_lambda_function.lambda.invoke_arn
  credentials = aws_iam_role.apigw.arn

  request_templates = {
    "application/json" = <<EOF
    {
      "text": "test"
    }
    EOF
  }
}

# API Gateawy Intergration Response
resource "aws_api_gateway_integration_response" "apigw_intergration_response_GET" {
  rest_api_id = aws_api_gateway_rest_api.apigw.id
  resource_id = aws_api_gateway_rest_api.apigw.root_resource_id
  http_method = aws_api_gateway_method.POST.http_method
  status_code = 200

  response_templates = {
    "application/json" = ""
  }

  depends_on = [aws_api_gateway_integration.api_GET]
}

resource "aws_api_gateway_integration_response" "apigw_intergration_response_POST" {
  rest_api_id = aws_api_gateway_rest_api.apigw.id
  resource_id = aws_api_gateway_rest_api.apigw.root_resource_id
  http_method = aws_api_gateway_method.POST.http_method
  status_code = 200

  response_templates = {
    "application/json" = ""
  }

  depends_on = [aws_api_gateway_integration.api_POST]
}

# API Gateway Method Response
resource "aws_api_gateway_method_response" "apigw_response_GET" {
  rest_api_id = aws_api_gateway_rest_api.apigw.id
  resource_id = aws_api_gateway_rest_api.apigw.root_resource_id
  http_method = aws_api_gateway_method.GET.http_method
  status_code = "200"
  
  response_models = {
    "application/json" = "Empty"
  }
}

resource "aws_api_gateway_method_response" "apigw_response_POST" {
  rest_api_id = aws_api_gateway_rest_api.apigw.id
  resource_id = aws_api_gateway_rest_api.apigw.root_resource_id
  http_method = aws_api_gateway_method.POST.http_method
  status_code = "200"

  response_models = {
    "application/json" = "Empty"
  }
}

# API Gateway Permission for Lambda
resource "aws_lambda_permission" "apigw_lambda" {
  statement_id = "AllowExecutionFromAPIGateway"
  action = "lambda:InvokeFunction"
  function_name = aws_lambda_function.lambda.function_name
  principal = "apigateway.amazonaws.com"

  source_arn = "${aws_api_gateway_rest_api.apigw.execution_arn}/*/*"
}

# Deploy Stage
resource "aws_api_gateway_deployment" "apigw" {
  depends_on = [aws_api_gateway_integration.api_GET, aws_api_gateway_integration.api_POST]
  rest_api_id = aws_api_gateway_rest_api.apigw.id
  stage_name = "<stage>"
}

# IAM
resource "aws_iam_role" "apigw" {
  name = "apigw-role"
  
  assume_role_policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Action = "sts:AssumeRole"
        Effect = "Allow"
        Sid = ""
        Principal = {
          Service = "apigateway.amazonaws.com"
        }
      }
    ]
  })

  managed_policy_arns = ["arn:aws:iam::aws:policy/AWSLambda_FullAccess"]
}

output "apigw" {
  value = aws_api_gateway_rest_api.apigw.arn
}
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