# This file is based on these images:
#
#   - https://hub.docker.com/r/hexpm/elixir/tags - for the builder image
#     E.g.: docker.io/hexpm/elixir:1.20.2-erlang-29.0.3-debian-trixie-20260713-slim
#   - https://hub.docker.com/_/debian/tags?name=trixie-20260713-slim - for the runner image
#     E.g.: docker.io/debian:trixie-20260713-slim
#
# Find builder and runner images on Docker Hub or on Hex's Build Server (Bob).
# We recommend using Bob's Web UI to find recent tags:
#
#   - https://bob.hex.pm/docker
#
# We suggest using the same Debian version for both the builder and runner images.
#
# We suggest Debian/Ubuntu instead of Alpine to avoid production compatibility issues
# (such as DNS resolution failures, and dynamically linked NIFs/precompiled binaries).
#
# For finding packages in Debian, search on https://packages.debian.org/.

ARG ELIXIR_VERSION=1.20.2
ARG OTP_VERSION=29.0.3
ARG DEBIAN_VERSION=trixie-20260713-slim

ARG BUILDER_IMAGE="docker.io/hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}@sha256:6fcd8ea864221b960c1ec418e3b10fa488298ff9e70c9e0f3db18070e610fb8a"
ARG RUNNER_IMAGE="docker.io/debian:${DEBIAN_VERSION}@sha256:020c0d20b9880058cbe785a9db107156c3c75c2ac944a6aa7ab59f2add76a7bd"

FROM docker.io/node:24.18.0-bookworm-slim@sha256:6f7b03f7c2c8e2e784dcf9295400527b9b1270fd37b7e9a7285cf83b6951452d AS node_deps

WORKDIR /assets
COPY assets/package.json assets/package-lock.json ./
RUN npm install --global npm@12.0.1 \
  && npm ci

FROM ${BUILDER_IMAGE} AS builder

# install build dependencies
RUN apt-get update \
  && apt-get install -y --no-install-recommends build-essential git \
  && rm -rf /var/lib/apt/lists/*

# prepare build dir
WORKDIR /app

# install hex + rebar
RUN mix local.hex --force \
  && mix local.rebar --force

# set build ENV
ENV MIX_ENV="prod"

# install mix dependencies
COPY mix.exs mix.lock ./
RUN mix deps.get --only $MIX_ENV
RUN mkdir config

# copy compile-time config files before we compile dependencies
# to ensure any relevant config change will trigger the dependencies
# to be re-compiled.
COPY config/config.exs config/${MIX_ENV}.exs config/
RUN mix deps.compile

RUN mix assets.setup

COPY priv priv

COPY lib lib

# Compile the release
RUN mix compile

COPY assets assets
COPY --from=node_deps /assets/node_modules assets/node_modules

# compile assets
RUN mix assets.deploy

# Changes to config/runtime.exs don't require recompiling the code
COPY config/runtime.exs config/

COPY rel rel
RUN mix release

# start a new build stage so that the final image will only contain
# the compiled release and other runtime necessities
FROM ${RUNNER_IMAGE} AS final

RUN apt-get update \
  && apt-get install -y --no-install-recommends libstdc++6 openssl libncurses6 locales ca-certificates curl \
  && rm -rf /var/lib/apt/lists/*

# Set the locale
RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen \
  && locale-gen

ENV LANG=en_US.UTF-8
ENV LANGUAGE=en_US:en
ENV LC_ALL=en_US.UTF-8

WORKDIR "/app"
RUN chown nobody /app

# set runner ENV
ENV MIX_ENV="prod"

# Only copy the final release from the build stage
COPY --from=builder --chown=nobody:root /app/_build/${MIX_ENV}/rel/who_need_help ./

USER nobody

# If using an environment that doesn't automatically reap zombie processes, it is
# advised to add an init process such as tini via `apt-get install`
# above and adding an entrypoint. See https://github.com/krallin/tini for details
# ENTRYPOINT ["/tini", "--"]

CMD ["/app/bin/server"]

FROM ${BUILDER_IMAGE} AS test

RUN apt-get update \
  && apt-get install -y --no-install-recommends build-essential git ca-certificates \
  && rm -rf /var/lib/apt/lists/*

WORKDIR /app
RUN mix local.hex --force \
  && mix local.rebar --force

ENV MIX_ENV="test"

COPY mix.exs mix.lock ./
RUN mix deps.get --only test

COPY config config
RUN mix deps.compile

COPY .formatter.exs ./
COPY priv priv
COPY lib lib
COPY test test

RUN mix compile

CMD ["mix", "test"]

# Keep the production release as the default build result while exposing the
# dedicated `test` target to scripts/test.sh.
FROM final AS release