#!/usr/bin/env bash
# ==============================================================================
# Radarr Migration Script: Host Service -> Kubernetes Cluster (namespace htpc)
# Executed to migrate Radarr from standalone systemd service on 10.2.0.4 to K8s
# ==============================================================================
set -euo pipefail

CLUSTER_HOST="10.2.0.4"
SSH_USER="bart"
HTPC_NS="htpc"

COLOR_GREEN="\033[0;32m"
COLOR_YELLOW="\033[1;33m"
COLOR_RED="\033[0;31m"
COLOR_BLUE="\033[0;34m"
COLOR_RESET="\033[0m"

log_info() { echo -e "${COLOR_GREEN}[INFO]${COLOR_RESET} $1"; }
log_step() { echo -e "\n${COLOR_BLUE}==>${COLOR_RESET} ${COLOR_GREEN}$1${COLOR_RESET}"; }
log_warn() { echo -e "${COLOR_YELLOW}[WARN]${COLOR_RESET} $1"; }
log_err()  { echo -e "${COLOR_RED}[ERROR]${COLOR_RESET} $1"; }

echo "========================================================================"
echo "   RADARR LIVE MIGRATIE NAAR KUBERNETES (NAMESPACE: HTPC)"
echo "========================================================================"
echo "Bron:       radarr.service op $CLUSTER_HOST (/storage/var/lib/radarr)"
echo "Doel:       K8s Pod in namespace '$HTPC_NS' op $CLUSTER_HOST"
echo "Downtime:   Geschat op minder dan 1 minuut"
echo "========================================================================"
echo ""

read -p "Weet je zeker dat je de Radarr migratie wilt starten? (j/N): " -r CONFIRM
if [[ ! "$CONFIRM" =~ ^[jJyY]$ ]]; then
    log_info "Migratie geannuleerd."
    exit 0
fi

# ------------------------------------------------------------------------------
# STAP 1: PRE-FLIGHT CHECKS
# ------------------------------------------------------------------------------
log_step "1. Pre-flight checks uitvoeren..."

log_info "Verbinding testen naar host ($CLUSTER_HOST)..."
ssh -o BatchMode=yes -o ConnectTimeout=5 "${SSH_USER}@${CLUSTER_HOST}" "true" || {
    log_err "Kan niet verbinden met host (${CLUSTER_HOST}) via SSH."
    exit 1
}

log_info "Controleren van Kubernetes node status..."
kubectl get node vmserver | grep -q "Ready" || {
    log_err "Kubernetes node vmserver is niet Ready!"
    exit 1
}

# ------------------------------------------------------------------------------
# STAP 2: K8S RESOURCES AANMAKEN (NAMESPACE & PVC)
# ------------------------------------------------------------------------------
log_step "2. Namespace en PVC aanmaken in Kubernetes..."
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
kubectl apply -k "${SCRIPT_DIR}/k8s/"

log_info "Wachten tot PVC radarr-config gebonden is..."
# local-path gebruikt WaitForFirstConsumer, dus de PV wordt provisioned zodra de pod start,
# of we triggeren de volume creatie.

# ------------------------------------------------------------------------------
# STAP 3: STANDALONE RADARR SERVICE STOPPEN & DATA SYNCHRONISEREN
# ------------------------------------------------------------------------------
log_step "3. Standalone radarr.service stoppen om database te bevriezen..."
ssh -t "${SSH_USER}@${CLUSTER_HOST}" "sudo systemctl stop radarr"

log_info "Standalone radarr.service uitschakelen (disable)..."
ssh -t "${SSH_USER}@${CLUSTER_HOST}" "sudo systemctl disable radarr"

# We starten tijdelijk een data-sync helper pod of wachten op pod creatie
log_step "4. Wachten tot Radarr Pod scheduled wordt en PV beschikbaar is..."

# Schaal deployment tijdelijk naar 0 als het draait zodat we veilig kunnen syncen
kubectl scale deployment/radarr -n "${HTPC_NS}" --replicas=0 2>/dev/null || true

# Start een lightweight helper pod om het volume te mounten en binden
cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: radarr-data-migrator
  namespace: ${HTPC_NS}
spec:
  nodeSelector:
    kubernetes.io/hostname: vmserver
  containers:
    - name: helper
      image: busybox
      command: ["sh", "-c", "sleep 3600"]
      volumeMounts:
        - name: config
          mountPath: /config
  volumes:
    - name: config
      persistentVolumeClaim:
        claimName: radarr-config
EOF

log_info "Wachten tot helper pod draait..."
kubectl wait --for=condition=Ready pod/radarr-data-migrator -n "${HTPC_NS}" --timeout=60s

log_step "5. Data overzetten van /storage/var/lib/radarr naar K8s volume..."
ssh -t "${SSH_USER}@${CLUSTER_HOST}" '
    RADARR_PV=$(kubectl get pv -o jsonpath="{range .items[?(@.spec.claimRef.name==\"radarr-config\")]}{.spec.hostPath.path}{end}")
    if [ -z "$RADARR_PV" ] || [ ! -d "$RADARR_PV" ]; then
        echo "FOUT: Kon PV pad niet vinden!"
        exit 1
    fi
    echo "Gevonden PV pad: $RADARR_PV"
    echo "Kopiëren van bestaande Radarr configuratie en database..."
    sudo cp -a /storage/var/lib/radarr/* "$RADARR_PV/"
    sudo chown -R 33:33 "$RADARR_PV"
    echo "Data overdracht voltooid."
'

log_info "Helper pod opruimen..."
kubectl delete pod radarr-data-migrator -n "${HTPC_NS}" --grace-period=0 --force 2>/dev/null || true

# ------------------------------------------------------------------------------
# STAP 6: RADARR K8S DEPLOYMENT STARTEN
# ------------------------------------------------------------------------------
log_step "6. Radarr deployment starten en schalen naar 1 replica..."
kubectl scale deployment/radarr -n "${HTPC_NS}" --replicas=1

log_info "Wachten op succesvolle uitrol van Radarr pod..."
kubectl rollout status deployment/radarr -n "${HTPC_NS}" --timeout=120s

# ------------------------------------------------------------------------------
# STAP 7: VERIFICATIE
# ------------------------------------------------------------------------------
log_step "7. Verificatie van Radarr endpoints..."
sleep 5

log_info "Lokale ping testen via host..."
ssh -o BatchMode=yes "${SSH_USER}@${CLUSTER_HOST}" "curl -I -s http://127.0.0.1:7878/radarr/ping" | head -n 1

log_info "Cluster IP service testen..."
CLUSTER_IP=$(kubectl get svc radarr -n "${HTPC_NS}" -o jsonpath='{.spec.clusterIP}')
ssh -o BatchMode=yes "${SSH_USER}@${CLUSTER_HOST}" "curl -I -s http://${CLUSTER_IP}:7878/radarr/ping" | head -n 1

echo ""
echo "========================================================================"
log_info "MIGRATIE SUCCESVOL AFGEROND!"
echo "Radarr draait nu als pod in Kubernetes namespace '${HTPC_NS}'."
echo "Bestaande Apache URL https://thuus.bnhmeijer.nl/radarr/ blijft actief."
echo "========================================================================"