#!/usr/bin/bash
#
# zone-snapshot.sh — refresh the git SoR snapshot of the Technitium zone
# store [#630][#728]
#
# Pulls the binary DZ zone files from netinfra-01 (the replication primary)
# into netinfra/dns/technitium/zones/ via the remote-dns.sh chokepoint, then
# shows which snapshot files changed.
#
# RULE (founder, 2026-09-02): run this after EVERY Technitium record change
# and commit the refreshed snapshots in the same session, so the git SoR
# never goes stale. netinfra/dns/drift-check.sh verifies the result; the
# pre-push rule audit fails on a stale questions file and drift-check is the
# DNS counterpart: green before you push any DNS-adjacent change.
#
# Usage:
#   zone-snapshot.sh            refresh snapshots from the primary
#   zone-snapshot.sh --check    verify only (delegates to drift-check.sh)
#
set -euo pipefail

HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"          # netinfra/dns/technitium
REPO="$(cd "$HERE/../../.." && pwd)"
REMOTE_DNS="$HERE/../../dns-cluster-setup/remote-dns.sh"
ZONES_DIR="$HERE/zones"
REMOTE_ZONE_DIR="/home/localuser/services/technitium/config/zones"

if [ "${1:-}" = "--check" ]; then
  exec bash "$HERE/../drift-check.sh"
fi

tmp="$(mktemp -d)"
trap 'rm -rf "$tmp"' EXIT

echo "Fetching zone store from netinfra-01 (primary)..."
bash "$REMOTE_DNS" netinfra01-root "cd '$REMOTE_ZONE_DIR' && tar cf - *.zone" > "$tmp/zones.tar"

# Validate the archive before touching the tracked tree.
tar -tf "$tmp/zones.tar" >/dev/null

mkdir -p "$ZONES_DIR"
find "$ZONES_DIR" -maxdepth 1 -name '*.zone' -delete
tar -xf "$tmp/zones.tar" -C "$ZONES_DIR"

count="$(find "$ZONES_DIR" -maxdepth 1 -name '*.zone' | wc -l)"
echo "Snapshotted $count zone files into ${ZONES_DIR#"$REPO"/}"

echo "Changed snapshot files (git):"
changed="$(git -C "$REPO" status --porcelain -- "$ZONES_DIR")"
if [ -n "$changed" ]; then
  printf '%s\n' "$changed" | sed "s|^$REPO/||" | head -20
  printf '%s\n' "$changed" | wc -l | xargs -I{} echo "{} files changed — commit these in the same session (DNS sync rule)"
else
  echo "  (none — snapshots were already current)"
fi

echo "Verify with: netinfra/dns/drift-check.sh"