#!/usr/bin/env bash
# netvm-provision-edge.sh — prepare an edge device for operator-managed NetVM.
# Run ON the edge device as a user with sudo (interactive sudo is fine).
# Idempotent: safe to re-run. Every edge device provisioned this way looks
# identical, so the operator uses one command everywhere.
set -euo pipefail

OPERATOR_USER="${OPERATOR_USER:-$(whoami)}"
REPO="$HOME/Projects/NetVM"
SUDOERS_FILE="/etc/sudoers.d/zz-netvm-operator"

echo "== NetVM edge provisioning (operator user: $OPERATOR_USER) =="

# 1. prerequisites (best-effort install for the common missing piece: wg)
if ! "$REPO/bin/netvm-verify.sh"; then
  echo "-- installing missing packages --"
  if command -v pacman >/dev/null 2>&1; then
    sudo pacman -S --noconfirm --needed wireguard-tools
  elif command -v apt-get >/dev/null 2>&1; then
    sudo apt-get update && sudo apt-get install -y wireguard
  else
    echo "install wireguard-tools manually, then re-run"; exit 1
  fi
  "$REPO/bin/netvm-verify.sh"
fi

# 2. repo must be here (sync over Tailscale first on non-laptop nodes)
[ -x "$REPO/bin/netvm-node-up.sh" ] || { echo "NetVM repo not at $REPO — sync it here first"; exit 1; }

# 3. sudoers allowlist: exact lifecycle scripts only, never blanket root
sudo tee "$SUDOERS_FILE" > /dev/null << SUDOERS
# NetVM operator lifecycle access — managed by netvm-provision-edge.sh. Named zz- so it sorts last: in sudoers the LAST matching entry wins, and this must beat any blanket (ALL) grant.
# Lets the operator user bring node egress up/down and read topology.
# WireGuard configs in /etc/netvm stay root-only; these scripts never print them.
$OPERATOR_USER ALL=(root) NOPASSWD: $REPO/bin/netvm-node-up.sh *, $REPO/bin/netvm-node-down.sh *, $REPO/bin/netvm-topology.sh
SUDOERS
sudo chmod 440 "$SUDOERS_FILE"
sudo visudo -c -f "$SUDOERS_FILE" > /dev/null && echo "ok: sudoers valid"

# 4. dir for human-placed WireGuard identities
sudo mkdir -p /etc/netvm
sudo chmod 700 /etc/netvm
echo "ok: /etc/netvm ready"

# 5. tailnet check
tailscale status >/dev/null 2>&1 && echo "ok: tailscale up" || echo "NOTE: tailscale not up — run: tailscale up"

echo
echo "Done. Human next step: place this node's WireGuard config at"
echo "  /etc/netvm/<node>.conf   (root-owned, 0600; wgcf-generated)"
echo "Operator usage from anywhere on the tailnet:"
echo "  ssh ${OPERATOR_USER}@<tail-ip> 'sudo -n $REPO/bin/netvm-node-up.sh <node>'"