# variables.tf — every sizing / IP / image knob is a variable (Phase 1 T-1.1).
# Defaults encode the LOCKED decisions in infra/PHASE1-SCOPE.md. Override via
# terraform.tfvars (see terraform.tfvars.example).

variable "libvirt_uri" {
  description = "libvirt connection URI."
  type        = string
  default     = "qemu:///system"
}

variable "pool_name" {
  description = "libvirt storage pool for all volumes (base image, OS + data disks, seed ISOs)."
  type        = string
  default     = "default"
}

# --- cluster identity / naming ---------------------------------------------

variable "cluster_name" {
  description = "Logical cluster name; used as a resource-name prefix."
  type        = string
  default     = "k3s-dev"
}

variable "node_name_prefix" {
  description = "VM hostname prefix. Nodes are <prefix>1, <prefix>2, ... (LOCKED: k3s-dev-1/2/3)."
  type        = string
  default     = "k3s-dev-"
}

variable "node_count" {
  description = "Number of k3s nodes (LOCKED: 3-server HA embedded etcd)."
  type        = number
  default     = 3

  validation {
    condition     = var.node_count == length(var.node_ips)
    error_message = "node_count must equal the number of entries in node_ips."
  }
}

# --- per-node sizing (LOCKED: 4 vCPU / 6 GiB / 20 GiB OS + 40 GiB data) -----

variable "vcpu" {
  description = "vCPUs per node."
  type        = number
  default     = 4
}

variable "memory_mib" {
  description = "RAM per node in MiB (6 GiB)."
  type        = number
  default     = 6144
}

variable "os_disk_gib" {
  description = "OS (root) disk size per node, GiB. Thin qcow2 backed by the cloud image."
  type        = number
  default     = 20
}

variable "data_disk_gib" {
  description = "Dedicated Longhorn data disk per node, GiB. Thin qcow2, blank."
  type        = number
  default     = 40
}

variable "cpu_mode" {
  description = "libvirt CPU mode. host-passthrough exposes nested-virt for KubeVirt (Phase 5)."
  type        = string
  default     = "host-passthrough"
}

# --- network (LOCKED: dedicated NAT k3s-dev 10.73.0.0/24, gw .1) ------------

variable "network_name" {
  description = "libvirt NAT network name."
  type        = string
  default     = "k3s-dev"
}

variable "network_cidr" {
  description = "Cluster NAT subnet in CIDR. Gateway (network_gateway) is the libvirt bridge host IP."
  type        = string
  default     = "10.73.0.0/24"
}

variable "network_prefix" {
  description = "Netmask prefix length for node static addressing."
  type        = number
  default     = 24
}

variable "network_gateway" {
  description = "Default gateway / DNS for nodes = libvirt bridge host IP (LOCKED: 10.73.0.1)."
  type        = string
  default     = "10.73.0.1"
}

variable "node_ips" {
  description = "Static IPs per node, in order (LOCKED: .11/.12/.13)."
  type        = list(string)
  default     = ["10.73.0.11", "10.73.0.12", "10.73.0.13"]
}

# Reserved for Cilium L2-announcement ingress VIPs (LOCKED: .240-.250).
# Not materialised as libvirt objects; surfaced in outputs and kept OUT of any
# DHCP range so nothing else claims them. Cilium's IP pool (WS-NET, Phase 2)
# consumes this range.
variable "cilium_l2_vip_range_start" {
  description = "First reserved Cilium L2 VIP."
  type        = string
  default     = "10.73.0.240"
}

variable "cilium_l2_vip_range_end" {
  description = "Last reserved Cilium L2 VIP."
  type        = string
  default     = "10.73.0.250"
}

# --- base OS image ----------------------------------------------------------

variable "image_source" {
  description = <<-EOT
    Source for the base OS volume: a URL or local path to a minimal cloud image
    (qcow2). Default is Debian 12 (bookworm) genericcloud amd64. Point at a local
    path to avoid re-downloading on every apply.
  EOT
  type        = string
  default     = "https://cloud.debian.org/images/cloud/bookworm/latest/debian-12-genericcloud-amd64.qcow2"
}

# --- cloud-init identity ----------------------------------------------------

variable "ssh_authorized_key" {
  description = "SSH PUBLIC key injected into the login user (public only — never a private key)."
  type        = string
}

variable "login_user" {
  description = "Non-root login user created by cloud-init; also the Ansible ansible_user."
  type        = string
  default     = "k3s"
}

variable "node_domain" {
  description = "DNS domain suffix for node FQDNs (informational; dev uses split-horizon / hosts)."
  type        = string
  default     = "k3s.dev.local"
}