#!/usr/bin/env bash
# Preview install for the Link Health read-only plugin only.
# Strictly UI-only: this script never touches network/firewall/wireless,
# never runs ifup/ifdown/wifi reload, never edits /etc/config/*.
#
# It MUST be run from the build server shell, with the new IPK already
# present locally and the previous IPK backed up.

set -euo pipefail

PKG_NAME="luci-app-tr3000-status"
NEW_IPK="${1:?usage: install_preview.sh path/to/luci-app-tr3000-status_<ver>_all.ipk}"
ROUTER="${ROUTER:-root@192.168.1.2}"
BACKUP_DIR="/root/.v46.1-preview/luci-app-tr3000-status"
TIMESTAMP="$(date +%Y%m%d-%H%M%S)"

[ -f "$NEW_IPK" ] || { echo "new ipk not found: $NEW_IPK" >&2; exit 2; }

echo "[info] target router: $ROUTER"
echo "[info] backup dir:    $BACKUP_DIR/$TIMESTAMP"

ssh -o BatchMode=yes "$ROUTER" "set -e; mkdir -p '$BACKUP_DIR/$TIMESTAMP'; if opkg list-installed | grep -q '$PKG_NAME'; then opkg list-installed $PKG_NAME | awk '{print \$3}' > '$BACKUP_DIR/$TIMESTAMP/prev_version'; fi; tar -C / -czf '$BACKUP_DIR/$TIMESTAMP/pre_overlay.tar.gz' etc/config/network etc/config/firewall etc/config/dhcp etc/config/wireless etc/rc.local etc/hotplug.d || true; echo '[ok] backup taken'"

echo "[info] installing $NEW_IPK"
scp "$NEW_IPK" "$ROUTER:/tmp/$PKG_NAME.ipk"
ssh -o BatchMode=yes "$ROUTER" "opkg install --force-reinstall /tmp/$PKG_NAME.ipk && rm -f /tmp/$PKG_NAME.ipk && /etc/init.d/rpcd restart && /etc/init.d/uhttpd restart >/dev/null 2>&1 || true; echo '[ok] installed'"

echo "[info] smoke test: call the rpc and inspect schema_version"
ssh -o BatchMode=yes "$ROUTER" "ubus call luci.tr3000_status get | head -c 400; echo"

echo "[done] backup retained at $BACKUP_DIR/$TIMESTAMP on the router"