resource "kubernetes_config_map" "grafana_datasources" {
  metadata {
    name      = "grafana-datasources"
    namespace = kubernetes_namespace.grafana.metadata[0].name
  }

  data = {
    "default.yml" = replace(local.grafana_datasource_config, "__PROMETHEUS_URL__", var.prometheus_url)
  }
}

resource "kubernetes_config_map" "grafana_dashboard_provider" {
  metadata {
    name      = "grafana-dashboard-provider"
    namespace = kubernetes_namespace.grafana.metadata[0].name
  }

  data = {
    "dashboard-provider.yml" = local.grafana_dashboard_provider
  }
}

resource "kubernetes_config_map" "grafana_dashboards" {
  metadata {
    name      = "grafana-dashboards"
    namespace = kubernetes_namespace.grafana.metadata[0].name
  }

  data = {
    "trivy-vulnerabilities-dashboard.json" = local.grafana_trivy_dashboard
    "gpu-realtime-dashboard.json"          = local.grafana_gpu_realtime_dashboard
  }
}

resource "kubernetes_deployment" "grafana" {

  metadata {
    name      = "grafana"
    namespace = kubernetes_namespace.grafana.metadata[0].name
    labels = {
      app = "grafana"
    }
  }
  spec {
    selector {
      match_labels = {
        app = "grafana"
      }
    }
    template {
      metadata {
        labels = {
          app = "grafana"
        }
      }
      spec {
        container {
          name              = "grafana"
          image             = "grafana/grafana:${local.app_version}"
          image_pull_policy = "IfNotPresent"
          security_context {
            run_as_user                = 1000
            run_as_non_root            = true
            privileged                 = false
            allow_privilege_escalation = false
          }
          port {
            name           = "http-grafana"
            container_port = 3000
            protocol       = "TCP"
          }
          readiness_probe {
            http_get {
              path   = "/robots.txt"
              port   = 3000
              scheme = "HTTP"
            }
            failure_threshold     = 3
            initial_delay_seconds = 10
            period_seconds        = 30
            success_threshold     = 1
            timeout_seconds       = 2
          }
          liveness_probe {
            tcp_socket {
              port = 3000
            }
            failure_threshold     = 3
            initial_delay_seconds = 30
            period_seconds        = 10
            success_threshold     = 1
            timeout_seconds       = 1
          }
          resources {
            requests = {
              cpu    = "250m"
              memory = "750Mi"
            }
          }
          volume_mount {
            name       = "grafana-pv"
            mount_path = "/var/lib/grafana"
          }
          volume_mount {
            name       = "grafana-datasources"
            mount_path = "/etc/grafana/provisioning/datasources"
            read_only  = true
          }
          volume_mount {
            name       = "grafana-dashboard-provider"
            mount_path = "/etc/grafana/provisioning/dashboards"
            read_only  = true
          }
          volume_mount {
            name       = "grafana-dashboards"
            mount_path = "/var/lib/grafana/dashboards"
            read_only  = true
          }
        }
        volume {
          name = "grafana-pv"
          host_path {
            path = local.monitoring_folder
          }
        }
        volume {
          name = "grafana-datasources"
          config_map {
            name = kubernetes_config_map.grafana_datasources.metadata[0].name
          }
        }
        volume {
          name = "grafana-dashboard-provider"
          config_map {
            name = kubernetes_config_map.grafana_dashboard_provider.metadata[0].name
          }
        }
        volume {
          name = "grafana-dashboards"
          config_map {
            name = kubernetes_config_map.grafana_dashboards.metadata[0].name
          }
        }
      }
    }
  }
}

resource "kubernetes_service" "grafana" {

  metadata {
    name      = "grafana"
    namespace = kubernetes_namespace.grafana.metadata[0].name
  }
  spec {
    selector = {
      app = "grafana"
    }
    port {
      port        = 3000
      protocol    = "TCP"
      target_port = "http-grafana"
    }
    session_affinity = "None"
    type             = "ClusterIP"
  }
}

resource "kubernetes_ingress_v1" "grafana" {

  metadata {
    name      = "ingress"
    namespace = kubernetes_namespace.grafana.metadata[0].name

    annotations = {
      "kubernetes.io/ingress.class"              = "public"
      "cert-manager.io/cluster-issuer"           = "letsencrypt-prod"
      "kubernetes.io/tls-acme"                   = "true"
      "nginx.ingress.kubernetes.io/ssl-redirect" = "true"
    }
  }
  spec {
    tls {
      hosts       = [var.fqdn]
      secret_name = "grafana-tls"
    }
    rule {
      host = var.fqdn
      http {
        path {
          backend {
            service {
              name = kubernetes_service.grafana.metadata[0].name
              port {
                number = 3000
              }
            }
          }
        }
      }
    }
  }
}