# talos-platform – gemeinsame Cluster-Dienste für Produktion (Talos)
# Hier liegt alles, was ALLE Apps brauchen. Apps (boday_tf, ...) bringen nur ihr eigenes Chart mit.

terraform {
  required_providers {
    kubernetes = {
      source  = "hashicorp/kubernetes"
      version = "~> 2.26"
    }
    helm = {
      source  = "hashicorp/helm"
      version = "~> 2.12"
    }
  }

  backend "consul" {
    address = "consul:8500"
    path    = "terraform/states/talos_platform"
  }
}

variable "kubeconfig_path" {
  type    = string
  default = "./talos_kubeconfig"
}

# Version des Traefik-Helm-Charts (traefik/traefik). Bewusst pinnen, damit Updates geplant passieren.
variable "traefik_chart_version" {
  type = string
}

provider "kubernetes" {
  config_path = var.kubeconfig_path
}

provider "helm" {
  kubernetes {
    config_path = var.kubeconfig_path
  }
}

# Feste IP für Traefik aus dem MetalLB-Pool. Auf diese IP zeigt das OPNsense-Portforwarding (80/443).
variable "traefik_lb_ip" {
  type = string
}

# Hostname des Longhorn-Dashboards (internes DNS, z.B. Unbound-Override in OPNsense)
variable "longhorn_host" {
  type    = string
  default = "longhorn.boday.lan"
}

# BasicAuth für Longhorn als htpasswd-Zeile, z.B.: htpasswd -nbB admin 'geheim'
variable "longhorn_basic_auth" {
  type      = string
  sensitive = true
}

# --- TLS: cert-manager + Let's Encrypt -------------------------------------

# Version des cert-manager-Helm-Charts (jetstack/cert-manager), bewusst gepinnt
variable "cert_manager_chart_version" {
  type = string
}

# Kontakt-E-Mail für Let's Encrypt (Ablauf-Warnungen)
variable "acme_email" {
  type = string
}

resource "helm_release" "cert_manager" {
  name             = "cert-manager"
  repository       = "https://charts.jetstack.io"
  chart            = "cert-manager"
  version          = var.cert_manager_chart_version
  namespace        = "cert-manager"
  create_namespace = true
  timeout          = 600
  atomic           = true

  values = [yamlencode({
    crds = { enabled = true }
  })]
}

# Eigener kleiner Chart, damit Terraform beim Plan die cert-manager-CRDs noch nicht kennen muss
resource "helm_release" "cluster_issuer" {
  name      = "cluster-issuer"
  chart     = "${path.module}/charts/cluster-issuer"
  namespace = "cert-manager"

  set {
    name  = "email"
    value = var.acme_email
  }

  depends_on = [helm_release.cert_manager]
}

# Kein hostPort mehr -> der Talos-Standard (PSA "baseline") reicht
resource "kubernetes_namespace" "traefik" {
  metadata {
    name = "traefik"
  }
}

# Traefik hinter einem MetalLB-LoadBalancer: VIP wandert bei Node-Ausfall auf den anderen Node
resource "helm_release" "traefik" {
  name       = "traefik"
  repository = "https://traefik.github.io/charts"
  chart      = "traefik"
  version    = var.traefik_chart_version
  namespace  = kubernetes_namespace.traefik.metadata[0].name
  timeout    = 600
  atomic     = true

  values = [yamlencode({
    deployment = { replicas = 2 }

    # Möglichst je ein Pod pro Node (weich: bei nur einem Worker laufen beide dort)
    topologySpreadConstraints = [{
      maxSkew           = 1
      topologyKey       = "kubernetes.io/hostname"
      whenUnsatisfiable = "ScheduleAnyway"
      labelSelector = {
        matchLabels = {
          "app.kubernetes.io/name"     = "traefik"
          "app.kubernetes.io/instance" = "traefik-traefik"
        }
      }
    }]

    service = {
      type = "LoadBalancer"
      annotations = {
        "metallb.io/loadBalancerIPs" = var.traefik_lb_ip
      }
      spec = {
        # Echte Client-IP bleibt erhalten (Django-Logs, CrowdSec)
        externalTrafficPolicy = "Local"
      }
    }

    ingressClass = {
      enabled        = true
      isDefaultClass = true
      name           = "traefik"
    }

    providers = {
      kubernetesIngress = { enabled = true }
      kubernetesCRD     = { enabled = true }
    }

    # Gemeinsame Routen der Plattform: Longhorn-Dashboard mit Login hinter Traefik
    extraObjects = [
      {
        apiVersion = "v1"
        kind       = "Secret"
        metadata   = { name = "longhorn-basic-auth", namespace = "longhorn-system" }
        type       = "Opaque"
        stringData = { users = var.longhorn_basic_auth }
      },
      {
        apiVersion = "traefik.io/v1alpha1"
        kind       = "Middleware"
        metadata   = { name = "longhorn-auth", namespace = "longhorn-system" }
        spec       = { basicAuth = { secret = "longhorn-basic-auth" } }
      },
      {
        apiVersion = "networking.k8s.io/v1"
        kind       = "Ingress"
        metadata = {
          name      = "longhorn"
          namespace = "longhorn-system"
          annotations = {
            "traefik.ingress.kubernetes.io/router.middlewares" = "longhorn-system-longhorn-auth@kubernetescrd"
          }
        }
        spec = {
          ingressClassName = "traefik"
          rules = [{
            host = var.longhorn_host
            http = {
              paths = [{
                path     = "/"
                pathType = "Prefix"
                backend  = { service = { name = "longhorn-frontend", port = { number = 80 } } }
              }]
            }
          }]
        }
      },
    ]
  })]
}

output "traefik_lb_ip" {
  value = var.traefik_lb_ip
}

# Adopt Traefik into the state again (lost when Consul restarted)
import {
  to = kubernetes_namespace.traefik
  id = "traefik"
}

import {
  to = helm_release.traefik
  id = "traefik/traefik"
}