data "google_client_config" "default" {}

# VPC
resource "google_compute_network" "network" {
  name                    = var.name
  auto_create_subnetworks = false
  project                 = var.project_id != null ? var.project_id : data.google_client_config.default.project
}

# Subnets
resource "google_compute_subnetwork" "subnet" {
  count         = length(var.subnets)
  name          = var.subnets[count.index].name
  project       = var.project_id != null ? var.project_id : data.google_client_config.default.project
  ip_cidr_range = var.subnets[count.index].cidr
  region        = var.subnets[count.index].region != null ? var.subnets[count.index].region : var.subnets[0].region
  network       = google_compute_network.network.id
}

# Cloud NAT
resource "google_compute_router" "cr" {
  count   = var.nat ? 1 : 0
  name    = "${var.name}-router"
  network = var.name
  project = var.project_id != null ? var.project_id : data.google_client_config.default.project

  depends_on = [google_compute_network.network]
}

resource "google_compute_router_nat" "nat" {
  count                              = var.nat ? 1 : 0
  name                               = "${var.name}-nat"
  project                            = var.project_id != null ? var.project_id : data.google_client_config.default.project
  router                             = google_compute_router.cr[0].name
  nat_ip_allocate_option             = "AUTO_ONLY"
  source_subnetwork_ip_ranges_to_nat = "ALL_SUBNETWORKS_ALL_IP_RANGES"
  enable_dynamic_port_allocation     = true
}