#!/bin/bash

# NUPST Uninstaller Script
# Completely removes NUPST from the system.
# Shipped as a release asset and installed to /opt/nupst/uninstall.sh by install.sh.

# Check if running as root
if [ "$EUID" -ne 0 ]; then
  echo "Please run as root (sudo nupst uninstall or sudo ./uninstall.sh)"
  exit 1
fi

# This script can be called directly or through the CLI
# When called through the CLI, environment variables are set
# REMOVE_CONFIG=yes|no - whether to remove configuration files
# REMOVE_REPO=yes|no - whether to remove the installation directory

# If not set through CLI, use defaults
REMOVE_CONFIG=${REMOVE_CONFIG:-"no"}
REMOVE_REPO=${REMOVE_REPO:-"no"}

echo "NUPST Uninstaller"
echo "================="
echo "This will completely remove NUPST from your system."

# Find the directory where this script is located
SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"

# Installation directory of the binary install (overridable for custom --install-dir installs)
INSTALL_DIR=${NUPST_INSTALL_DIR:-"/opt/nupst"}
if [ -f "$SCRIPT_DIR/nupst" ]; then
  INSTALL_DIR="$SCRIPT_DIR"
fi

# Step 1: Stop and disable the systemd service if it exists
if [ -f "/etc/systemd/system/nupst.service" ]; then
  echo "Stopping NUPST service..."
  systemctl stop nupst.service 2>/dev/null

  echo "Disabling NUPST service..."
  systemctl disable nupst.service 2>/dev/null

  echo "Removing systemd service file..."
  rm -f /etc/systemd/system/nupst.service

  echo "Reloading systemd daemon..."
  systemctl daemon-reload
fi

# Step 2: Remove global symlinks created by install.sh
for symlink_dir in /usr/local/bin /usr/bin; do
  if [ -L "$symlink_dir/nupst" ]; then
    echo "Removing global symlink: $symlink_dir/nupst"
    rm -f "$symlink_dir/nupst"
  fi
done

# Step 3: Remove configuration if requested
if [ "$REMOVE_CONFIG" = "yes" ]; then
  echo "Removing configuration files..."
  rm -rf /etc/nupst
else
  # If not called through CLI, ask user
  if [ -z "$NUPST_CLI_CALL" ]; then
    read -p "Do you want to remove the NUPST configuration files? (y/N) " -n 1 -r
    echo
    if [[ $REPLY =~ ^[Yy]$ ]]; then
      echo "Removing configuration files..."
      rm -rf /etc/nupst
    fi
  fi
fi

# Step 4: Remove the installation directory if requested
# Covers both the binary install (/opt/nupst with the nupst binary) and the
# legacy git checkout used by NUPST v3 and earlier.
if [ "$REMOVE_REPO" != "yes" ] && [ -z "$NUPST_CLI_CALL" ] && [ -d "$INSTALL_DIR" ]; then
  read -p "Do you want to remove the NUPST installation directory ($INSTALL_DIR)? (y/N) " -n 1 -r
  echo
  if [[ $REPLY =~ ^[Yy]$ ]]; then
    REMOVE_REPO="yes"
  fi
fi

if [ "$REMOVE_REPO" = "yes" ]; then
  if [ -d "$INSTALL_DIR" ] && { [ -f "$INSTALL_DIR/nupst" ] || [ -d "$INSTALL_DIR/.git" ]; }; then
    echo "Removing NUPST installation directory: $INSTALL_DIR"

    if [ "$INSTALL_DIR" = "$SCRIPT_DIR" ]; then
      # The uninstaller lives inside the directory that is being removed, so the
      # removal has to happen after this script exits.
      CLEANUP_SCRIPT=$(mktemp)
      {
        echo "#!/bin/bash"
        echo "sleep 1"
        echo "rm -rf \"$INSTALL_DIR\""
        echo "rm -f \"\$0\""
        echo "echo \"NUPST installation directory has been removed.\""
      } > "$CLEANUP_SCRIPT"
      chmod +x "$CLEANUP_SCRIPT"

      nohup "$CLEANUP_SCRIPT" > /dev/null 2>&1 &

      echo "NUPST installation directory will be removed after the uninstaller exits."
    else
      rm -rf "$INSTALL_DIR"
      echo "NUPST installation directory removed."
    fi
  else
    echo "No NUPST installation directory found at $INSTALL_DIR."
  fi
else
  # If not requested, just display info
  if [ -d "$INSTALL_DIR" ]; then
    echo
    echo "NUPST installation directory at $INSTALL_DIR will remain intact."
  fi
fi

# Check for npm global installation
NODE_PATH=$(which node 2>/dev/null)
if [ -n "$NODE_PATH" ]; then
  NPM_PATH=$(dirname "$NODE_PATH")/npm
  if [ -x "$NPM_PATH" ]; then
    echo
    echo "If you installed NUPST via npm, you may want to uninstall it with:"
    echo "  npm uninstall -g @serve.zone/nupst"
  fi
fi

echo
echo "NUPST has been uninstalled from your system."