terraform {
  required_providers {
    proxmox = {
      source  = "bpg/proxmox"
      version = "= 0.81.0"
    }
  }
  backend "http" {
  }
}

locals {
  dump_name = "qemu-nixos-fediversity-${var.category}.qcow2"
}

# https://registry.terraform.io/providers/bpg/proxmox/latest/docs
provider "proxmox" {
  endpoint = "https://${var.host}:8006/"
  insecure = true

  # used only for files and creating custom disks
  ssh {
    agent = true
    # uncomment and configure if using api_token instead of password
    username = "root"
    # node {
    #   name = "${var.node_name}"
    #   address = "${var.host}"
    #   # port = 22
    # }
  }

  # # Choose one authentication method:
  # api_token = var.virtual_environment_api_token
  # # OR
  username  = var.proxmox_user
  password  = var.proxmox_password
  # # OR
  # auth_ticket           = var.virtual_environment_auth_ticket
  # csrf_prevention_token = var.virtual_environment_csrf_prevention_token
}

# # FIXME move to host
# # FIXME add proxmox
# data "external" "base-hash" {
#   program = ["sh", "-c", "echo \"{\\\"hash\\\":\\\"$(nix-hash ${path.module}/../common/nixos/base.nix)\\\"}\""]
# }

# # hash of our code directory, used to trigger re-deploy
# # FIXME calculate separately to reduce false positives
# data "external" "hash" {
#   program = ["sh", "-c", "echo \"{\\\"hash\\\":\\\"$(nix-hash ..)\\\"}\""]
# }

# FIXME handle known-hosts in TF state
# FIXME move to host
# FIXME switch to base image shared between jobs as upload seems a bottleneck? e.g. by:
# - recursive TF
# - hash in name over overwrite
# won't notice file changes: https://github.com/bpg/terraform-provider-proxmox/issues/677
resource "proxmox_virtual_environment_file" "upload" {
  # # https://developer.hashicorp.com/terraform/plugin/sdkv2/resources/retries-and-customizable-timeouts
  # timeouts {
  #   create = "60m"
  # }

  # content_type - (Optional) The content type. If not specified, the content type will be inferred from the file extension. Valid values are:
  #     backup (allowed extensions: .vzdump, .tar.gz, .tar.xz, tar.zst)
  #     iso (allowed extensions: .iso, .img)
  #     snippets (allowed extensions: any)
  #     import (allowed extensions: .raw, .qcow2, .vmdk)
  #     vztmpl (allowed extensions: .tar.gz, .tar.xz, tar.zst)
  # content_type = "backup"
  content_type = "import"
  # https://192.168.51.81:8006/#v1:0:=storage%2Fnode051%2Flocal:4::=contentIso:::::
  # PVE -> Datacenter -> Storage -> local -> Edit -> General -> Content -> check Import + Disk Images -> OK
  # that UI action also adds it in `/etc/pve/storage.cfg`
  datastore_id = var.image_datastore_id
  node_name    = var.node_name
  overwrite = true
  timeout_upload = 180
  # timeout_upload = 1

  source_file {
    # path = "/tmp/proxmox-image/${local.dump_name}"
    path = var.image
    file_name = local.dump_name
  }
}

resource "proxmox_virtual_environment_vm" "nix_vm" {
  lifecycle {
    # wait, would this not disseminate any changes to this property,
    # or just defer syncing when only this changed?
    ignore_changes = [
      disk["import_from"],
    ]
  }
  node_name      = var.node_name
  pool_id        = var.pool_id
  description    = var.description
  started        = true

  # https://wiki.nixos.org/wiki/Virt-manager#Guest_Agent
  agent {
    enabled = true
    # timeout = "5m"
    timeout = "2m"
    trim = true
  }

  cpu {
    type         = "x86-64-v2-AES"
    cores        = var.cores
    sockets      = var.sockets
    numa         = true
  }

  memory {
    dedicated    = var.memory
  }

  disk {
    datastore_id = var.vm_datastore_id
    file_format  = "qcow2"
    interface    = "scsi0"
    discard      = "on"
    iothread     = true
    size         = var.disk_size
    ssd          = true
    backup       = false
    cache        = "none"

    # FIXME make the provider allow this as a distinct block to allow making this depend on VM id?
    # FIXME replace with an effectful ~~function~~template from vm_id replacing resource `proxmox_virtual_environment_file.upload`
    # import_from  = "local:import/${proxmox_virtual_environment_vm.nix_vm.vm_id}-${local.dump_name}" # bogus import name to test if it would accept self-referential values here # may not refer to itself
    # import_from  = "local:import/${local.dump_name}"
    import_from  = proxmox_virtual_environment_file.upload.id
  }

  efi_disk {
    datastore_id = var.vm_datastore_id
    file_format  = "qcow2"
    type         = "4m"
  }

  network_device {
    model        = "virtio"
    bridge       = var.bridge
    vlan_id      = var.vlan_id
  }

  operating_system {
    type         = "l26"
  }

  scsi_hardware  = "virtio-scsi-single"
  bios           = "ovmf"

  initialization {
    datastore_id = var.cd_datastore_id
    ip_config {
      ipv4 {
        gateway = var.ipv4_gateway
        address = var.ipv4_address
      }
      # ipv6 {
      #   gateway = var.ipv6_gateway
      #   address = var.ipv6_address
      # }
    }
  }
}

resource "null_resource" "wait_for_ssh" {
  depends_on = [
    proxmox_virtual_environment_vm.nix_vm
  ]
  provisioner "local-exec" {
    command = <<-EOT
      for i in $(seq 1 10); do
        if ssh \
        -i "${var.key_file}" \
        -o BatchMode=yes \
        -o StrictHostKeyChecking=no \
        -o ConnectTimeout=1 \
        -o ServerAliveInterval=1 \
        root@${proxmox_virtual_environment_vm.nix_vm.ipv4_addresses[1][0]} "true"; then
          exit 0
        fi
        echo "Waiting for SSH (attempt #$i)..."
        sleep 5
      done
      echo "SSH never came up!" >&2
      exit 1
    EOT
  }
}

# FIXME expose (and handle thru) [`exec`](https://pve.proxmox.com/pve-docs/api-viewer/#/nodes/{node}/qemu/{vmid}/agent/exec) endpoint in proxmox TF provider? wait, what command would i use it for?: https://github.com/bpg/terraform-provider-proxmox/issues/1576
module "nixos-rebuild" {
  depends_on = [
    null_resource.wait_for_ssh
  ]
  source = "../tf-single-host"
  nixos_conf = var.nixos_conf
  # username = var.ssh_user # refers to the proxmox ssh user, not the VM one
  username = "root"
  host = proxmox_virtual_environment_vm.nix_vm.ipv4_addresses[1][0]
  key_file = var.key_file
  ssh_opts = var.ssh_opts
}

output "ipv4" {
  value = proxmox_virtual_environment_vm.nix_vm.ipv4_addresses[1]
}
output "ipv6" {
  value = proxmox_virtual_environment_vm.nix_vm.ipv6_addresses[1]
}