# Find eligible builder and runner images on Docker Hub. We use Ubuntu/Debian
# instead of Alpine to avoid DNS resolution issues in production.
#
# https://hub.docker.com/r/hexpm/elixir/tags?page=1&name=ubuntu
# https://hub.docker.com/_/ubuntu?tab=tags
#
# This file is based on these images:
#
#   - https://hub.docker.com/r/hexpm/elixir/tags - for the build image
#   - https://hub.docker.com/_/debian?tab=tags&page=1&name=bullseye-20231009-slim - for the release image
#   - https://pkgs.org/ - resource for finding needed packages
#   - Ex: hexpm/elixir:1.16.0-erlang-26.2.1-debian-bullseye-20231009-slim
#
ARG ELIXIR_VERSION=1.16.2
ARG OTP_VERSION=26.2.2
ARG DEBIAN_VERSION=bookworm-20240130-slim

ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"

FROM ${BUILDER_IMAGE} as builder

# install build dependencies
RUN apt-get update -y && apt-get install -y build-essential git curl \
    && apt-get clean && rm -f /var/lib/apt/lists/*_*

# prepare build dir
WORKDIR /app

# Install nodejs
RUN curl -sL https://deb.nodesource.com/setup_20.x -o nodesource_setup.sh
RUN bash nodesource_setup.sh
RUN apt-get install -y nodejs
RUN npm install -g yarn

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

# set build ENV
ENV MIX_ENV="prod"
ENV ERL_FLAGS="+JPperf true"

# 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

COPY priv priv

COPY lib lib

COPY assets assets

# compile assets
RUN yarn --cwd assets install
RUN mix assets.deploy

# Compile the release
RUN mix compile

# 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}

RUN apt-get update -y
RUN apt-get install -y libstdc++6 openssl libncurses5 locales ca-certificates \
  ffmpeg curl git openssh-client
RUN apt-get clean && rm -f /var/lib/apt/lists/*_*

# Download and update YT-DLP
RUN curl -L https://github.com/yt-dlp/yt-dlp/releases/latest/download/yt-dlp -o /usr/local/bin/yt-dlp
RUN chmod a+rx /usr/local/bin/yt-dlp
RUN yt-dlp -U

# 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 up data volumes
RUN mkdir /config /downloads
RUN chown nobody /config /downloads

# set runner ENV
ENV MIX_ENV="prod"
ENV CONFIG_PATH="/config"
ENV PORT=8945
ENV RUN_CONTEXT="selfhosted"

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

# NEVER do this if you're running in an environment where you don't trust the user
# (ie: most environments). This is only acceptable in a self-hosted environment.
# The user could just run the whole container as root and bypass this anyway so
# it's not a huge deal.
# This removes the root password to allow users to assume root if needed. This is
# preferrable to running the whole container as root so that the files/directories
# created by the app aren't owned by root and are therefore easier for other users
# and processes to interact with. If you want to just run the whole container as
# root, use --user 0:0 or something.
RUN passwd -d root

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", "--"]

# Start the app
CMD ["/app/bin/docker_start"]