data "aws_vpc" "syslog" {
  filter {
    name   = "tag:Name"
    values = ["syslog-server-vpc"]
  }
}

data "aws_internet_gateway" "syslog" {
  filter {
    name   = "tag:Name"
    values = ["syslog-server-igw"]
  }
}

data "aws_vpn_gateway" "syslog" {
  filter {
    name   = "tag:Name"
    values = ["syslog-server-office"]
  }

  attached_vpc_id = data.aws_vpc.syslog.id
}

data "aws_route_table" "syslog_public" {
  vpc_id = data.aws_vpc.syslog.id

  filter {
    name   = "tag:Name"
    values = ["syslog-server-public"]
  }
}

resource "aws_subnet" "file_share" {
  vpc_id                  = data.aws_vpc.syslog.id
  cidr_block              = local.subnet_cidr
  availability_zone       = local.subnet_az
  map_public_ip_on_launch = true

  tags = {
    Name = "file-share"
  }

  lifecycle {
    precondition {
      condition     = one(data.aws_internet_gateway.syslog.attachments[*].vpc_id) == data.aws_vpc.syslog.id
      error_message = "syslog IGW is not attached to the syslog VPC."
    }

    precondition {
      condition     = data.aws_vpn_gateway.syslog.attached_vpc_id == data.aws_vpc.syslog.id
      error_message = "syslog VPN gateway is not attached to the syslog VPC."
    }
  }
}

resource "aws_route_table_association" "file_share" {
  subnet_id      = aws_subnet.file_share.id
  route_table_id = data.aws_route_table.syslog_public.id
}