#!/usr/bin/env bash
#
# k8s/proxmox-tuning.sh — apply ultix-style Proxmox tuning to k8s VMs
#
# Codifies the config applied 2026-09-01 during the #367 rebuild:
#   - disk: ssd=1,discard=on (guest sees non-rotational; qcow2 trims)
#   - net:  queues=2 on both NICs (multiqueue; guest activates via ethtool)
#   - cpu:  cpuunits so etcd/control plane wins host CPU contention
#   - boot: onboot=1 + startup order (cnodes before wnodes)
#   - balloon was already 0 on every k8s VM (etcd memory predictability)
#
# Pending items (ssd/discard, queues) activate at the VM's next restart.
# Reboot waves are SERIAL with a health gate between hops — never batch.
#
# DRY RUN by default. Apply with RUN=1. Run on each Proxmox host, or via
#   PROX_HOST=<host> bash tests/remote.sh prox 'bash -s' < k8s/proxmox-tuning.sh
#
set -uo pipefail
RUN="${RUN:-0}"

# vmid|cpuunits|startup|scsi0-line|net0-line|net1-line
# scsi0/net lines are the FULL desired config (Proxmox replaces wholesale).
TUNINGS=(
  "102|4000|order=20,up=180|S2:102/vm-102-disk-0.qcow2,cache=writeback,iothread=1,ssd=1,discard=on,size=32G|virtio=BC:24:11:CB:97:10,bridge=vmbr0,firewall=1,queues=2|virtio=BC:24:11:47:13:08,bridge=datanet,queues=2"
  "705|4000|order=20,up=180|S1:705/vm-705-disk-0.qcow2,cache=writeback,iothread=1,ssd=1,discard=on,size=32G|virtio=BC:24:11:40:25:F8,bridge=vmbr0,firewall=1,queues=2|virtio=BC:24:11:AF:3D:89,bridge=datanet,queues=2"
  "603|4000|order=20,up=180|D1:603/vm-603-disk-0.qcow2,cache=writeback,format=qcow2,iothread=1,ssd=1,discard=on,size=32G|virtio=BC:24:11:38:C0:58,bridge=vmbr0,firewall=1,queues=2|virtio=BC:24:11:1F:F1:E1,bridge=storagenet,queues=2"
  "313|2000|order=40,up=120|local-lvm:vm-313-disk-0,iothread=1,ssd=1,discard=on,size=300G|virtio=BC:24:11:EE:7E:7B,bridge=vmbr0,firewall=1,queues=2|virtio=BC:24:11:DF:C2:E9,bridge=datanet,queues=2"
  "601|2000|order=40,up=120|local-lvm:vm-601-disk-0,iothread=1,ssd=1,discard=on,size=32G|virtio=BC:24:11:FA:6E:B5,bridge=vmbr0,firewall=1,queues=2|virtio=BC:24:11:39:7D:0B,bridge=storagenet,queues=2"
  "701|2000|order=40,up=120|S2:701/vm-701-disk-0.qcow2,cache=writeback,iothread=1,ssd=1,discard=on,size=32G|virtio=BC:24:11:30:B8:07,bridge=vmbr0,firewall=1,queues=2|virtio=BC:24:11:C8:0E:8A,bridge=datanet,queues=2"
  "905|2000|order=40,up=120|S2:905/vm-905-disk-0.qcow2,cache=writeback,iothread=1,ssd=1,discard=on,size=32G|virtio=BC:24:11:EE:2B:B6,bridge=vmbr0,firewall=1,queues=2|virtio=BC:24:11:9B:57:06,bridge=datanet,queues=2"
)

apply() {
  local vmid="$1" cpuunits="$2" startup="$3" scsi0="$4" net0="$5" net1="$6"
  if [ "$RUN" = "1" ]; then
    qm set "$vmid" --cpuunits "$cpuunits" --startup "$startup" \
      --scsi0 "$scsi0" --net0 "$net0" --net1 "$net1"
  else
    echo "DRY: qm set $vmid --cpuunits $cpuunits --startup $startup --scsi0 $scsi0 --net0 $net0 --net1 $net1"
  fi
}

for t in "${TUNINGS[@]}"; do
  IFS='|' read -r vmid cpuunits startup scsi0 net0 net1 <<< "$t"
  # Skip VMs that live on other hosts (qm set errors on unknown VMID)
  if ! qm status "$vmid" >/dev/null 2>&1; then
    echo "skip: VM $vmid not on this host"
    continue
  fi
  echo "== VM $vmid =="
  apply "$vmid" "$cpuunits" "$startup" "$scsi0" "$net0" "$net1"
done

echo
if [ "$RUN" = "1" ]; then
  for t in "${TUNINGS[@]}"; do
    vmid="${t%%|*}"
    qm status "$vmid" >/dev/null 2>&1 || continue
    echo "--- pending VM $vmid ---"
    qm pending "$vmid" | grep -E "^(new|cur) (scsi0|net0|net1|cpuunits|startup)" || true
  done
fi