#!/usr/bin/env bash
set -euo pipefail

if [[ "${EUID}" -ne 0 ]]; then
  echo "Please run as root: sudo ./bin/install-slave.sh"
  exit 1
fi

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PACKAGE_ROOT="$(dirname "$SCRIPT_DIR")"

INSTALL_DIR="${1:-/opt/redis-clip-sync}"
SERVICE_NAME="${SERVICE_NAME:-redis-clip-sync}"
RUN_USER="${RUN_USER:-${SUDO_USER:-root}}"
RUN_GROUP="${RUN_GROUP:-$RUN_USER}"
TEMPLATE_PATH="$PACKAGE_ROOT/systemd/redis-clip-sync.service.tpl"
TARGET_SERVICE_FILE="/etc/systemd/system/${SERVICE_NAME}.service"

if [[ ! -f "$TEMPLATE_PATH" ]]; then
  echo "Template not found: $TEMPLATE_PATH"
  exit 1
fi

echo "Installing to: $INSTALL_DIR"
mkdir -p "$INSTALL_DIR"

if [[ -f "$INSTALL_DIR/conf/config.properties" ]]; then
  cp "$INSTALL_DIR/conf/config.properties" "$INSTALL_DIR/conf/config.properties.bak.$(date +%Y%m%d%H%M%S)"
  echo "Existing config backed up in $INSTALL_DIR/conf"
fi

cp -a "$PACKAGE_ROOT/bin" "$INSTALL_DIR/"
cp -a "$PACKAGE_ROOT/lib" "$INSTALL_DIR/"
cp -a "$PACKAGE_ROOT/conf" "$INSTALL_DIR/"
cp -a "$PACKAGE_ROOT/systemd" "$INSTALL_DIR/"
mkdir -p "$INSTALL_DIR/logs" "$INSTALL_DIR/run"

chown -R "$RUN_USER:$RUN_GROUP" "$INSTALL_DIR"
chmod +x "$INSTALL_DIR/bin/start.sh" "$INSTALL_DIR/bin/stop.sh" "$INSTALL_DIR/bin/status.sh" "$INSTALL_DIR/bin/logs.sh"

SERVICE_CONTENT="$(<"$TEMPLATE_PATH")"
SERVICE_CONTENT="${SERVICE_CONTENT//__INSTALL_DIR__/$INSTALL_DIR}"
SERVICE_CONTENT="${SERVICE_CONTENT//__RUN_USER__/$RUN_USER}"
SERVICE_CONTENT="${SERVICE_CONTENT//__RUN_GROUP__/$RUN_GROUP}"

printf '%s\n' "$SERVICE_CONTENT" > "$TARGET_SERVICE_FILE"

systemctl daemon-reload
systemctl enable --now "$SERVICE_NAME"

echo
echo "Install completed"
echo "Service name: $SERVICE_NAME"
echo "Install dir:  $INSTALL_DIR"
echo
echo "Useful commands:"
echo "  systemctl status $SERVICE_NAME"
echo "  journalctl -u $SERVICE_NAME -f"
echo "  systemctl restart $SERVICE_NAME"