resource "oci_network_load_balancer_network_load_balancer" "k3s_public_lb" {
  compartment_id             = var.compartment_ocid
  display_name               = var.public_load_balancer_name
  subnet_id                  = oci_core_subnet.oci_core_subnet11.id
  network_security_group_ids = [oci_core_network_security_group.public_lb_nsg.id]

  is_private                     = false
  is_preserve_source_destination = false

  freeform_tags = {
    "provisioner"           = "terraform"
    "environment"           = "${var.environment}"
    "${var.unique_tag_key}" = "${var.unique_tag_value}"
  }
}

# HTTP
resource "oci_network_load_balancer_listener" "k3s_http_listener" {
  default_backend_set_name = oci_network_load_balancer_backend_set.k3s_http_backend_set.name
  name                     = "k3s_http_listener"
  network_load_balancer_id = oci_network_load_balancer_network_load_balancer.k3s_public_lb.id
  port                     = var.http_lb_port
  protocol                 = "TCP"
}

resource "oci_network_load_balancer_backend_set" "k3s_http_backend_set" {
  health_checker {
    protocol = "TCP"
    port     = var.http_lb_port
  }

  name                     = "k3s_http_backend"
  network_load_balancer_id = oci_network_load_balancer_network_load_balancer.k3s_public_lb.id
  policy                   = "FIVE_TUPLE"
  is_preserve_source       = true
}

resource "oci_network_load_balancer_backend" "k3s_http_backend" {
  depends_on = [
    oci_core_instance_pool.k3s_workers,
  ]

  count                    = var.k3s_worker_pool_size
  backend_set_name         = oci_network_load_balancer_backend_set.k3s_http_backend_set.name
  network_load_balancer_id = oci_network_load_balancer_network_load_balancer.k3s_public_lb.id
  name                     = format("%s:%s", data.oci_core_instance_pool_instances.k3s_workers_instances.instances[count.index].id, var.http_lb_port)
  port                     = var.http_lb_port
  target_id                = data.oci_core_instance_pool_instances.k3s_workers_instances.instances[count.index].id
}

resource "oci_network_load_balancer_backend" "k3s_http_backend_extra_node" {
  count = var.k3s_extra_worker_node ? 1 : 0

  backend_set_name         = oci_network_load_balancer_backend_set.k3s_http_backend_set.name
  network_load_balancer_id = oci_network_load_balancer_network_load_balancer.k3s_public_lb.id
  name                     = format("%s:%s", oci_core_instance.k3s_extra_worker_node[count.index].id, var.http_lb_port)
  port                     = var.http_lb_port
  target_id                = oci_core_instance.k3s_extra_worker_node[count.index].id
}

# HTTPS
resource "oci_network_load_balancer_listener" "k3s_https_listener" {
  default_backend_set_name = oci_network_load_balancer_backend_set.k3s_https_backend_set.name
  name                     = "k3s_https_listener"
  network_load_balancer_id = oci_network_load_balancer_network_load_balancer.k3s_public_lb.id
  port                     = var.https_lb_port
  protocol                 = "TCP"
}

resource "oci_network_load_balancer_backend_set" "k3s_https_backend_set" {
  health_checker {
    protocol = "TCP"
    port     = var.https_lb_port
  }

  name                     = "k3s_https_backend"
  network_load_balancer_id = oci_network_load_balancer_network_load_balancer.k3s_public_lb.id
  policy                   = "FIVE_TUPLE"
  is_preserve_source       = true
}

resource "oci_network_load_balancer_backend" "k3s_https_backend" {
  depends_on = [
    oci_core_instance_pool.k3s_workers,
  ]

  count                    = var.k3s_worker_pool_size
  backend_set_name         = oci_network_load_balancer_backend_set.k3s_https_backend_set.name
  network_load_balancer_id = oci_network_load_balancer_network_load_balancer.k3s_public_lb.id
  name                     = format("%s:%s", data.oci_core_instance_pool_instances.k3s_workers_instances.instances[count.index].id, var.https_lb_port)
  port                     = var.https_lb_port
  target_id                = data.oci_core_instance_pool_instances.k3s_workers_instances.instances[count.index].id
}

resource "oci_network_load_balancer_backend" "k3s_https_backend_extra_node" {
  count = var.k3s_extra_worker_node ? 1 : 0

  backend_set_name         = oci_network_load_balancer_backend_set.k3s_https_backend_set.name
  network_load_balancer_id = oci_network_load_balancer_network_load_balancer.k3s_public_lb.id
  name                     = format("%s:%s", oci_core_instance.k3s_extra_worker_node[count.index].id, var.https_lb_port)
  port                     = var.https_lb_port
  target_id                = oci_core_instance.k3s_extra_worker_node[count.index].id
}

## kube-api

resource "oci_network_load_balancer_listener" "k3s_kubeapi_listener" {
  count                    = var.expose_kubeapi ? 1 : 0
  default_backend_set_name = oci_network_load_balancer_backend_set.k3s_kubeapi_backend_set[count.index].name
  name                     = "k3s_kubeapi_listener"
  network_load_balancer_id = oci_network_load_balancer_network_load_balancer.k3s_public_lb.id
  port                     = var.kube_api_port
  protocol                 = "TCP"
}

resource "oci_network_load_balancer_backend_set" "k3s_kubeapi_backend_set" {
  count = var.expose_kubeapi ? 1 : 0

  health_checker {
    protocol = "TCP"
    port     = var.kube_api_port
  }

  name                     = "k3s_kubeapi_backend"
  network_load_balancer_id = oci_network_load_balancer_network_load_balancer.k3s_public_lb.id
  policy                   = "FIVE_TUPLE"
  is_preserve_source       = true
}

resource "oci_network_load_balancer_backend" "k3s_kubeapi_backend" {
  depends_on = [
    oci_core_instance_pool.k3s_servers,
  ]

  count                    = var.expose_kubeapi ? var.k3s_server_pool_size : 0
  backend_set_name         = oci_network_load_balancer_backend_set.k3s_kubeapi_backend_set[0].name
  network_load_balancer_id = oci_network_load_balancer_network_load_balancer.k3s_public_lb.id
  name                     = format("%s:%s", data.oci_core_instance_pool_instances.k3s_servers_instances.instances[count.index].id, var.kube_api_port)
  port                     = var.kube_api_port
  target_id                = data.oci_core_instance_pool_instances.k3s_servers_instances.instances[count.index].id
}