# syntax=docker/dockerfile:1

################################################################################
# Create a stage for building the application.

ARG RUST_VERSION=1.71.1
ARG APP_NAME=timing-beachhead
ARG PACKAGE_NAME=beachhead
FROM rust:${RUST_VERSION}-slim-bullseye AS build
ARG APP_NAME
ARG PACKAGE_NAME
WORKDIR /app

RUN apt-get update && \
    apt-get install -y --no-install-recommends \
    build-essential \
    pkg-config \
    libssl-dev \
    && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

# Build the application.
# Leverage a cache mount to /usr/local/cargo/registry/
# for downloaded dependencies and a cache mount to /app/target/ for 
# compiled dependencies which will speed up subsequent builds.
# Leverage a bind mount to the src directory to avoid having to copy the
# source code into the container. Once built, copy the executable to an
# output directory before the cache mounted /app/target is unmounted.
RUN --mount=type=bind,source=src,target=src \
    --mount=type=bind,source=obsidian-portal,target=obsidian-portal \
    --mount=type=bind,source=toggl-portal,target=toggl-portal \
    --mount=type=bind,source=lectures-portal,target=lectures-portal \
    --mount=type=bind,source=Cargo.toml,target=Cargo.toml \
    --mount=type=bind,source=Cargo.lock,target=Cargo.lock \
    --mount=type=cache,target=/app/target/ \
    --mount=type=cache,target=/usr/local/cargo/registry/ \
    <<EOF
set -e
cargo build --locked --release --package $PACKAGE_NAME
cp ./target/release/$APP_NAME /bin/server
EOF

################################################################################
# Create a new stage for running the application that contains the minimal
# runtime dependencies for the application. This often uses a different base
# image from the build stage where the necessary files are copied from the build
# stage.
#
# The example below uses the debian bullseye image as the foundation for running the app.
# By specifying the "bullseye-slim" tag, it will also use whatever happens to be the
# most recent version of that tag when you build your Dockerfile. If
# reproducability is important, consider using a digest
# (e.g., debian@sha256:ac707220fbd7b67fc19b112cee8170b41a9e97f703f588b2cdbbcdcecdd8af57).
FROM debian:bullseye-slim AS final

# Install curl for health check, clean up apt
RUN apt-get update && \
    apt-get install -y --no-install-recommends ca-certificates curl && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/*

# Disabled to allow read access to the database file.
## Create a non-privileged user that the app will run under.
## See https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#user
#ARG UID=10001
#RUN adduser \
#    --disabled-password \
#    --gecos "" \
#    --home "/nonexistent" \
#    --shell "/sbin/nologin" \
#    --no-create-home \
#    --uid "${UID}" \
#    appuser
#USER appuser

# Copy the executable from the "build" stage.
COPY --from=build /bin/server /bin/

# Expose the port that the application listens on.
ENV ADDRESS=0.0.0.0:3000
EXPOSE 3000

HEALTHCHECK \
  CMD curl -f http://localhost:3000/health || exit 1

# What the container should run when it is started.
CMD ["/bin/server"]