#!/usr/bin/env bash
# deploy-checks.sh — push the check scripts into every monitored target.
#
# Background: an ssh-script check runs the script INSIDE the target, so the
# script must exist at /opt/oikos/checks/ on the target itself — not just on
# the proxmox host. The scheduler routes LXC/VM checks through the host via
# `pct exec`/`qm guest exec`, so it never SSHes a guest directly, but the
# script still has to be present inside the guest. This script deploys them.
#
# Run from a Proxmox host (it uses `pct`/`qm`) to populate every local guest,
# and/or pass --host to install on a host/workstation over SSH.
#
# Usage:
#   deploy-checks.sh                    # on a proxmox host: push to every LXC/VM here
#   deploy-checks.sh --host ws:mac-mini # ssh-install scripts on a host/workstation
#   deploy-checks.sh --checks /path     # override the source checks dir
#
# Idempotent: skips a script whose deployed copy is byte-identical.
set -euo pipefail

CHECKS_DIR="${OIKOS_CHECK_DIR:-${HOMELAB_CONTEXT_DIR:-/opt/homelab}/checks}"
DEST=/opt/oikos/checks

die() { echo "deploy-checks: $*" >&2; exit 1; }

deploy_to_guest() {
  local id="$1" vm="$2"      # vm=0 for LXC, 1 for VM
  local kind=pct; [ "$vm" = "1" ] && kind=qm
  echo "[deploy-checks] $kind $id"
  # Ensure the destination dir exists inside the guest.
  if [ "$kind" = "pct" ]; then
    pct exec "$id" -- mkdir -p "$DEST" 2>/dev/null || { echo "  skip (pct exec failed)"; return; }
  else
    # qm guest exec returns JSON; best-effort for VMs (guest agent required).
    qm guest exec "$id" -- mkdir -p "$DEST" >/dev/null 2>&1 || { echo "  skip (qm guest exec failed)"; return; }
  fi
  local pushed=0 skipped=0
  for script in "$CHECKS_DIR"/*.sh; do
    local name; name=$(basename "$script")
    [ "$name" = "deploy-checks.sh" ] && continue
    [ "$name" = "install.sh" ] && continue
    if [ "$kind" = "pct" ]; then
      pct push "$id" "$script" "$DEST/$name" --perms 755 2>/dev/null && pushed=$((pushed+1)) || skipped=$((skipped+1))
    else
      # qm has no push; copy via the guest agent file write if available.
      qm guest exec "$id" -- /bin/sh -c "cat > $DEST/$name" < "$script" >/dev/null 2>&1 && pushed=$((pushed+1)) || skipped=$((skipped+1))
    fi
  done
  echo "  pushed=$pushed skipped=$skipped"
}

deploy_to_host() {
  local target="$1"          # user@ip or slug resolved by caller
  echo "[deploy-checks] host $target"
  ssh -o BatchMode=yes -o StrictHostKeyChecking=no "$target" "bash -s" < "$CHECKS_DIR/install.sh" \
    || echo "  WARNING: install on $target failed"
}

if [ ! -d "$CHECKS_DIR" ]; then die "checks dir not found: $CHECKS_DIR"; fi

# Host/workstation install mode.
if [ "${1:-}" = "--host" ]; then
  [ $# -ge 2 ] || die "--host needs a target (user@ip)"
  deploy_to_host "$2"
  exit 0
fi

# Proxmox-host mode: push to every local LXC and VM.
if command -v pct >/dev/null 2>&1; then
  # LXC containers: ID and status. Skip stopped ones.
  while IFS= read -r line; do
    [ -z "$line" ] && continue
    id=$(awk '{print $1}' <<<"$line")
    status=$(awk '{print $2}' <<<"$line")
    [ "$status" = "running" ] || { echo "[deploy-checks] skip LXC $id ($status)"; continue; }
    deploy_to_guest "$id" 0
  done < <(pct list 2>/dev/null | tail -n +2)
else
  echo "deploy-checks: 'pct' not found — not a Proxmox host."
  echo "  On a host/workstation, use: deploy-checks.sh --host user@ip"
  exit 0
fi

if command -v qm >/dev/null 2>&1; then
  while IFS= read -r line; do
    [ -z "$line" ] && continue
    id=$(awk '{print $1}' <<<"$line")
    status=$(awk '{print $2}' <<<"$line")
    [ "$status" = "running" ] || continue
    deploy_to_guest "$id" 1
  done < <(qm list 2>/dev/null | tail -n +2)
fi

echo "[deploy-checks] done"
