FROM ruby:4.0.6-slim-bookworm

# build-essential: puma has a native (C) extension; harmless if the
# platform-specific gem in Gemfile.lock already has a precompiled binary
# matching this base image, but keeps the build working if it doesn't.
# ca-certificates/curl: needed for the go-pmtiles download below (also
# handy for anyone debugging inside a running container).
RUN apt-get update && apt-get install --no-install-recommends -y build-essential ca-certificates curl \
  && rm -rf /var/lib/apt/lists/*

# The `pmtiles` CLI (lib/maptool/pmtiles_builder.rb's "Regenerate for
# current view" — see docs/development.adoc) — no Debian package exists,
# so this pulls the static binary straight from its own GitHub releases.
# Architecture-matched (Debian's dpkg arch name translated to the release
# asset's own naming) rather than hardcoded amd64, so this still works
# building on an arm64 host. Pinned, like every other dependency in this
# repo (Gemfile, docs/third-party-notices.adoc) — bump PMTILES_VERSION
# deliberately, not via `latest`.
ARG PMTILES_VERSION=1.31.2
RUN set -eux; \
  case "$(dpkg --print-architecture)" in \
    amd64) pmtiles_arch=x86_64 ;; \
    arm64) pmtiles_arch=arm64 ;; \
    *) echo "unsupported architecture for go-pmtiles: $(dpkg --print-architecture)" >&2; exit 1 ;; \
  esac; \
  curl -fsSL "https://github.com/protomaps/go-pmtiles/releases/download/v${PMTILES_VERSION}/go-pmtiles_${PMTILES_VERSION}_Linux_${pmtiles_arch}.tar.gz" \
    | tar xz -C /usr/local/bin pmtiles

WORKDIR /app

COPY Gemfile Gemfile.lock ./
RUN bundle install

COPY . .

EXPOSE 4567
CMD ["bundle", "exec", "puma", "-C", "config/puma.rb"]