locals {
  # coreos-stable -> coreos flavor, stable channel
  # flatcar-stable -> flatcar flavor, stable channel
  flavor = element(split("-", var.os_channel), 0)

  channel = element(split("-", var.os_channel), 1)
}

// Container Linux Install profile (from release.core-os.net)
resource "matchbox_profile" "container-linux-install" {
  count = length(var.controller_names) + length(var.worker_names)
  name  = format("%s-container-linux-install-%s", var.cluster_name, element(concat(var.controller_names, var.worker_names), count.index))

  kernel = "${var.download_protocol}://${local.channel}.release.core-os.net/amd64-usr/${var.os_version}/coreos_production_pxe.vmlinuz"

  initrd = [
    "${var.download_protocol}://${local.channel}.release.core-os.net/amd64-usr/${var.os_version}/coreos_production_pxe_image.cpio.gz",
  ]

  args = flatten([
    "initrd=coreos_production_pxe_image.cpio.gz",
    "coreos.config.url=${var.matchbox_http_endpoint}/ignition?uuid=$${uuid}&mac=$${mac:hexhyp}",
    "coreos.first_boot=yes",
    "console=tty0",
    "console=ttyS0",
    var.kernel_args,
  ])

  container_linux_config = element(data.template_file.container-linux-install-configs.*.rendered, count.index)
}

data "template_file" "container-linux-install-configs" {
  count = length(var.controller_names) + length(var.worker_names)

  template = file("${path.module}/cl/install.yaml.tmpl")

  vars = {
    os_flavor           = local.flavor
    os_channel          = local.channel
    os_version          = var.os_version
    ignition_endpoint   = format("%s/ignition", var.matchbox_http_endpoint)
    install_disk        = var.install_disk
    container_linux_oem = var.container_linux_oem
    ssh_authorized_key  = var.ssh_authorized_key
    # only cached-container-linux profile adds -b baseurl
    baseurl_flag = ""
  }
}

// Container Linux Install profile (from matchbox /assets cache)
// Note: Admin must have downloaded os_version into matchbox assets/coreos.
resource "matchbox_profile" "cached-container-linux-install" {
  count = length(var.controller_names) + length(var.worker_names)
  name  = format("%s-cached-container-linux-install-%s", var.cluster_name, element(concat(var.controller_names, var.worker_names), count.index))

  kernel = "/assets/coreos/${var.os_version}/coreos_production_pxe.vmlinuz"

  initrd = [
    "/assets/coreos/${var.os_version}/coreos_production_pxe_image.cpio.gz",
  ]

  args = flatten([
    "initrd=coreos_production_pxe_image.cpio.gz",
    "coreos.config.url=${var.matchbox_http_endpoint}/ignition?uuid=$${uuid}&mac=$${mac:hexhyp}",
    "coreos.first_boot=yes",
    "console=tty0",
    "console=ttyS0",
    var.kernel_args,
  ])

  container_linux_config = element(data.template_file.cached-container-linux-install-configs.*.rendered, count.index)
}

data "template_file" "cached-container-linux-install-configs" {
  count = length(var.controller_names) + length(var.worker_names)

  template = file("${path.module}/cl/install.yaml.tmpl")

  vars = {
    os_flavor           = local.flavor
    os_channel          = local.channel
    os_version          = var.os_version
    ignition_endpoint   = format("%s/ignition", var.matchbox_http_endpoint)
    install_disk        = var.install_disk
    container_linux_oem = var.container_linux_oem
    ssh_authorized_key  = var.ssh_authorized_key
    # profile uses -b baseurl to install from matchbox cache
    baseurl_flag = "-b ${var.matchbox_http_endpoint}/assets/${local.flavor}"
  }
}

// Flatcar Linux install profile (from release.flatcar-linux.net)
resource "matchbox_profile" "flatcar-install" {
  count = length(var.controller_names) + length(var.worker_names)
  name  = format("%s-flatcar-install-%s", var.cluster_name, element(concat(var.controller_names, var.worker_names), count.index))

  kernel = "${var.download_protocol}://${local.channel}.release.flatcar-linux.net/amd64-usr/${var.os_version}/flatcar_production_pxe.vmlinuz"

  initrd = [
    "${var.download_protocol}://${local.channel}.release.flatcar-linux.net/amd64-usr/${var.os_version}/flatcar_production_pxe_image.cpio.gz",
  ]

  args = flatten([
    "initrd=flatcar_production_pxe_image.cpio.gz",
    "flatcar.config.url=${var.matchbox_http_endpoint}/ignition?uuid=$${uuid}&mac=$${mac:hexhyp}",
    "flatcar.first_boot=yes",
    "console=tty0",
    "console=ttyS0",
    var.kernel_args,
  ])

  container_linux_config = element(data.template_file.container-linux-install-configs.*.rendered, count.index)
}

// Flatcar Linux Install profile (from matchbox /assets cache)
// Note: Admin must have downloaded os_version into matchbox assets/flatcar.
resource "matchbox_profile" "cached-flatcar-linux-install" {
  count = length(var.controller_names) + length(var.worker_names)
  name  = format("%s-cached-flatcar-linux-install-%s", var.cluster_name, element(concat(var.controller_names, var.worker_names), count.index))

  kernel = "/assets/flatcar/${var.os_version}/flatcar_production_pxe.vmlinuz"

  initrd = [
    "/assets/flatcar/${var.os_version}/flatcar_production_pxe_image.cpio.gz",
  ]

  args = flatten([
    "initrd=flatcar_production_pxe_image.cpio.gz",
    "flatcar.config.url=${var.matchbox_http_endpoint}/ignition?uuid=$${uuid}&mac=$${mac:hexhyp}",
    "flatcar.first_boot=yes",
    "console=tty0",
    "console=ttyS0",
    var.kernel_args,
  ])

  container_linux_config = element(data.template_file.cached-container-linux-install-configs.*.rendered, count.index)
}

// Kubernetes Controller profiles
resource "matchbox_profile" "controllers" {
  count        = length(var.controller_names)
  name         = format("%s-controller-%s", var.cluster_name, element(var.controller_names, count.index))
  raw_ignition = element(data.ct_config.controller-ignitions.*.rendered, count.index)
}

data "ct_config" "controller-ignitions" {
  count        = length(var.controller_names)
  content      = element(data.template_file.controller-configs.*.rendered, count.index)
  pretty_print = false
  snippets     = local.clc_map[element(var.controller_names, count.index)]
}

data "template_file" "controller-configs" {
  count = length(var.controller_names)

  template = file("${path.module}/cl/controller.yaml.tmpl")

  vars = {
    domain_name            = element(var.controller_domains, count.index)
    etcd_name              = element(var.controller_names, count.index)
    etcd_initial_cluster   = join(",", formatlist("%s=https://%s:2380", var.controller_names, var.controller_domains))
    cgroup_driver = var.os_channel == "flatcar-edge" ? "systemd" : "cgroupfs"
    cluster_dns_service_ip = module.bootkube.cluster_dns_service_ip
    cluster_domain_suffix  = var.cluster_domain_suffix
    ssh_authorized_key     = var.ssh_authorized_key
  }
}

// Kubernetes Worker profiles
resource "matchbox_profile" "workers" {
  count        = length(var.worker_names)
  name         = format("%s-worker-%s", var.cluster_name, element(var.worker_names, count.index))
  raw_ignition = element(data.ct_config.worker-ignitions.*.rendered, count.index)
}

data "ct_config" "worker-ignitions" {
  count        = length(var.worker_names)
  content      = element(data.template_file.worker-configs.*.rendered, count.index)
  pretty_print = false
  snippets     = local.clc_map[element(var.worker_names, count.index)]
}

data "template_file" "worker-configs" {
  count = length(var.worker_names)

  template = file("${path.module}/cl/worker.yaml.tmpl")

  vars = {
    domain_name            = element(var.worker_domains, count.index)
    cgroup_driver = var.os_channel == "flatcar-edge" ? "systemd" : "cgroupfs"
    cluster_dns_service_ip = module.bootkube.cluster_dns_service_ip
    cluster_domain_suffix  = var.cluster_domain_suffix
    ssh_authorized_key     = var.ssh_authorized_key
  }
}

locals {
  # Hack to workaround https://github.com/hashicorp/terraform/issues/17251
  # Still an issue in Terraform v0.12 https://github.com/hashicorp/terraform/issues/20572
  # Default Container Linux config snippets map every node names to list("\n") so
  # all lookups succeed
  clc_defaults = zipmap(
    concat(var.controller_names, var.worker_names),
    chunklist(data.template_file.clc-default-snippets.*.rendered, 1),
  )

  # Union of the default and user specific snippets, later overrides prior.
  clc_map = merge(local.clc_defaults, var.clc_snippets)
}

// Horrible hack to generate a Terraform list of node count length
data "template_file" "clc-default-snippets" {
  count    = length(var.controller_names) + length(var.worker_names)
  template = "\n"
}