# ---------------------------------------------------------------------------
# Amazon API Gateway
# ---------------------------------------------------------------------------

resource "aws_api_gateway_rest_api" "this" {
  name        = var.name
  description = var.description
  tags        = var.tags
}

resource "aws_api_gateway_resource" "this" {
  path_part   = "resource"
  parent_id   = aws_api_gateway_rest_api.this.root_resource_id
  rest_api_id = aws_api_gateway_rest_api.this.id
}

resource "aws_api_gateway_method" "this" {
  rest_api_id   = aws_api_gateway_rest_api.this.id
  resource_id   = aws_api_gateway_resource.this.id
  http_method   = "ANY"
  authorization = "NONE"
}

resource "aws_api_gateway_integration" "this" {
  rest_api_id             = aws_api_gateway_rest_api.this.id
  resource_id             = aws_api_gateway_resource.this.id
  http_method             = aws_api_gateway_method.this.http_method
  integration_http_method = "ANY"
  type                    = "AWS_PROXY"
  uri                     = var.lambda_function_arn
}

resource "aws_api_gateway_deployment" "this" {
  rest_api_id = aws_api_gateway_rest_api.this.id

  triggers = {
    redeployment = sha1(jsonencode([
      aws_api_gateway_resource.this.id,
      aws_api_gateway_method.this.id,
      aws_api_gateway_integration.this.id,
    ]))
  }

  lifecycle {
    create_before_destroy = true
  }
}

resource "aws_api_gateway_stage" "this" {
  deployment_id = aws_api_gateway_deployment.this.id
  rest_api_id   = aws_api_gateway_rest_api.this.id
  stage_name    = "production"
}

resource "aws_lambda_permission" "this" {
  statement_id  = "AllowExecutionFromAPIGateway"
  action        = "lambda:InvokeFunction"
  function_name = var.lambda_function_name
  principal     = "apigateway.amazonaws.com"
  source_arn    = "${var.lambda_source_arn}:${aws_api_gateway_rest_api.this.id}/*/${aws_api_gateway_method.this.http_method}${aws_api_gateway_resource.this.path}"
}