# Use a lightweight Ruby base image
FROM ruby:3.1-slim

ENV RACK_ENV=production

# Install system dependencies
RUN apt-get update -y && \
    apt-get install -y --no-install-recommends \
      build-essential curl ca-certificates libxml2-dev libxslt1-dev zlib1g-dev bash && \
    rm -rf /var/lib/apt/lists/* && \
    ln -sf /bin/bash /bin/sh

# Set workdir and copy source
WORKDIR /app
COPY . .

# Install Rack (no Gemfile present in this repo)
RUN gem update --system && gem install rack

# Create a non-root user and set permissions
RUN useradd -m app
RUN chown -R app:app /app

USER app

# Expose port 9292 for Rack server
EXPOSE 9292

# Healthcheck to verify container readiness
HEALTHCHECK CMD curl -fsS http://localhost:9292/health || exit 1

# Start Rack server
CMD ["rackup", "config.ru", "-o", "0.0.0.0", "-p", "9292"]