#!/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: OPHALEN VAN HET PV PAD
# ------------------------------------------------------------------------------
log_step "2. Detecteren van het actieve PV-pad voor radarr-config..."
RADARR_PV=$(kubectl get pv -o jsonpath='{range .items[?(@.spec.claimRef.name=="radarr-config")]}{.spec.hostPath.path}{end}')

if [ -z "$RADARR_PV" ]; then
    log_err "Geen PersistentVolume gevonden voor claim 'radarr-config' in namespace '$HTPC_NS'!"
    exit 1
fi
log_info "Gevonden PV pad: $RADARR_PV"

# ------------------------------------------------------------------------------
# STAP 3: STANDALONE RADARR SERVICE STOPPEN & POD SCHALEN NAAR 0
# ------------------------------------------------------------------------------
log_step "3. Standalone radarr.service stoppen om database te bevriezen..."
ssh -t "${SSH_USER}@${CLUSTER_HOST}" "sudo systemctl stop radarr && sudo systemctl disable radarr"

log_info "Kubernetes radarr pod tijdelijk naar 0 schalen voor data-overdracht..."
kubectl scale deployment/radarr -n "${HTPC_NS}" --replicas=0
kubectl wait --for=delete pod -l app=radarr -n "${HTPC_NS}" --timeout=60s 2>/dev/null || true

# ------------------------------------------------------------------------------
# STAP 4: DATA KOPIËREN NAAR K8S VOLUME
# ------------------------------------------------------------------------------
log_step "4. Data overzetten van /storage/var/lib/radarr naar $RADARR_PV..."
ssh -t "${SSH_USER}@${CLUSTER_HOST}" "
    echo 'Kopiëren van bestaande configuratie, database en covers...'
    sudo cp -a /storage/var/lib/radarr/* '$RADARR_PV/'
    sudo chown -R 33:33 '$RADARR_PV'
    echo 'Data overdracht voltooid.'
"

# ------------------------------------------------------------------------------
# STAP 5: RADARR K8S DEPLOYMENT HERSTARTEN
# ------------------------------------------------------------------------------
log_step "5. 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 6: VERIFICATIE
# ------------------------------------------------------------------------------
log_step "6. Verificatie van Radarr endpoints..."
sleep 3

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 "========================================================================"