# Dockerfile for Dokku deployment
# Multi-stage build for Phoenix/Elixir app with monorepo layout

ARG ELIXIR_VERSION=1.18.3
ARG OTP_VERSION=27.2.4
ARG DEBIAN_VERSION=bookworm-20260316-slim

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

# =============================================================================
# Build stage
# =============================================================================
FROM ${BUILDER_IMAGE} AS builder

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

WORKDIR /build

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

ENV MIX_ENV="prod"

# Copy blogex dependency first (changes less often)
COPY blogex /build/blogex

# Copy app dependency files first for better layer caching
COPY app/mix.exs app/mix.lock /build/app/
WORKDIR /build/app

RUN mix deps.get --only $MIX_ENV
RUN mkdir config

# Copy compile-time config files
COPY app/config/config.exs app/config/${MIX_ENV}.exs config/
RUN mix deps.compile

# Copy application source and compile
COPY app/priv priv
COPY app/assets assets
COPY app/lib lib
COPY app/rel rel
COPY app/config/runtime.exs config/

RUN mix compile

# Build assets after compile (phoenix-colocated hooks need compiled app)
RUN mix assets.deploy

# Build the release
RUN mix release

# =============================================================================
# Runtime stage
# =============================================================================
FROM ${RUNNER_IMAGE}

RUN apt-get update -y && \
    apt-get install -y libstdc++6 openssl libncurses5 locales ca-certificates \
    && apt-get clean && rm -f /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
ENV MIX_ENV="prod"

# Copy the release from the build stage
COPY --from=builder --chown=nobody:root /build/app/_build/${MIX_ENV}/rel/firehose ./

USER nobody

# Dokku uses the EXPOSE port for routing
EXPOSE 5000

ENV PHX_SERVER=true

CMD ["/app/bin/server"]