# Use an official Elixir runtime as a parent image
FROM elixir:1.15.6-slim AS build

# Set the environment to production
ENV MIX_ENV=prod

# Install system dependencies
RUN apt-get update && \
    apt-get install -y build-essential sqlite3 libsqlite3-dev && \
    apt-get clean

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

# Create the application build directory
WORKDIR /app

# Copy our mix files and fetch our dependencies
COPY mix.exs mix.lock ./
COPY config config
RUN mix do deps.get, deps.compile

# Set Node.js environment to production
ENV NODE_ENV=production

# Use Node.js to install assets
FROM node:14 AS node-build
WORKDIR /app/assets
COPY assets/package.json assets/package-lock.json ./
RUN npm install
COPY assets/ ./
RUN npm run deploy

# Switch back to our Elixir image to continue building
FROM build AS app-build
WORKDIR /app
COPY --from=node-build /app/assets/build ./priv/static
RUN mix phx.digest

# Copy our application source code
COPY lib lib
COPY priv priv

# Compile and build the application
RUN mix do compile, phx.digest

# Create the release
RUN mix release

# ---- Application Stage ----
FROM debian:buster-slim AS app

# Install runtime dependencies
RUN apt-get update && apt-get install -y openssl libsqlite3-0 && apt-get clean

# Create and switch to the app user
RUN useradd --create-home app
USER app
WORKDIR /home/app

# Copy over the build artifact from the previous step and create a symlink
COPY --from=build --chown=app:app /app/_build/prod/rel/ezcontainer_railway ./
RUN ln -s /home/app/ezcontainer_railway/bin/my_app /home/app/bin

# Specify the entry point
ENTRYPOINT ["bin/my_app", "start"]