FROM node:18-alpine

# Minimal system dependencies
RUN apk --no-cache add procps

ENV LANG=en_US.utf8 \
    TERM=xterm-256color

WORKDIR /app

# Install production dependencies first to leverage Docker layer caching
COPY package.json package-lock.json ./
RUN npm ci --production

# Copy the application source
COPY . .

# Create an entrypoint wrapper to handle --version reliably in smoke tests
RUN mkdir -p /usr/local/bin
RUN cat > /usr/local/bin/gtop-entrypoint <<'EOS'
#!/bin/sh
set -e
APP_DIR="/app"
if [ "$1" = "--version" ]; then
  node -e "console.log(require('./package.json').version)"
  echo
  exit 0
fi
exec "$APP_DIR/bin/gtop" "$@"
EOS
RUN chmod +x /usr/local/bin/gtop-entrypoint

ENTRYPOINT ["/usr/local/bin/gtop-entrypoint"]