ARG RUBY_VER=2.5.1
ARG APP_PATH=/usr/src/app
ARG ENVIRONMENT=production

##################
# Stage: Builder
##################
FROM ruby:${RUBY_VER}-alpine as builder

# Set working dir
ARG APP_PATH
RUN mkdir $APP_PATH
WORKDIR $APP_PATH

# Set environment
ARG ENVIRONMENT
ENV RAILS_ENV $ENVIRONMENT
ENV NODE_ENV $ENVIRONMENT

# Install build dependencies
RUN apk --update add --no-cache \
    build-base \
    # For nokogiri
    libxml2-dev libxslt-dev \
    # For uglifier & webpacker
    nodejs \
    # For postgresql
    postgresql-dev \
    # For tzinfo-data
    tzdata \
    # For webpacker
    yarn

# Bundle gems
COPY Gemfile Gemfile.lock $APP_PATH/
RUN if [[ "$RAILS_ENV" == "production" ]]; \
    then bundle install --jobs "$(getconf _NPROCESSORS_ONLN)" --retry 5 --without development test; \
    else bundle install --jobs "$(getconf _NPROCESSORS_ONLN)" --retry 5; \
    fi

# Install Javascript packages
COPY package.json yarn.lock $APP_PATH/
RUN if [[ "$NODE_ENV" == "production" ]]; \
    then yarn install --frozen-lockfile --production; \
    else yarn install --frozen-lockfile; \
    fi \
    && yarn cache clean

COPY . $APP_PATH/

# Precompile assets
RUN if [[ "$RAILS_ENV" == "production" ]]; \
    then bundle exec rails assets:precompile; \
    fi

# Cleanup
RUN rm -rf node_modules tmp/* log/* /usr/local/bundle/cache/*.gem \
    && find /usr/local/bundle/gems/ -name "*.c" -delete \
    && find /usr/local/bundle/gems/ -name "*.o" -delete

##################
# Stage: Final app
##################
FROM ruby:${RUBY_VER}-alpine

ARG APP_PATH
ENV PATH $APP_PATH/bin:$PATH
ENV RAILS_LOG_TO_STDOUT true

# Set working dir
RUN mkdir $APP_PATH
WORKDIR $APP_PATH

# Install runtime dependencies
RUN apk --update add --no-cache \
    # For Active Storage
    imagemagick \
    # For uglifier & webpacker
    nodejs \
    # For postgresql
    postgresql-dev \
    # For tzinfo-data
    tzdata

# Set environment
ARG ENVIRONMENT
ENV RAILS_ENV $ENVIRONMENT
ENV NODE_ENV $ENVIRONMENT

COPY --from=builder $APP_PATH $APP_PATH
COPY --from=builder /usr/local/bundle/ /usr/local/bundle/

# Tighten security
RUN chown -R nobody:nogroup $APP_PATH
USER nobody

CMD ["bundle", "exec", "rails", "s", "-p", "3000", "-b", "0.0.0.0"]