# syntax=docker/dockerfile:1

# Debian build environment (latest stable, Debian 13 "trixie") producing a .deb
# alongside the binary. Separate from Dockerfile (Ubuntu 26.04) because the
# distro and its libc++/SDL3 versions differ, and a .deb's dependencies must be
# generated against the distro it targets.
#
# Toolchain: clang-19 + libc++-19 (for `import std;`). Debian 13 ships CMake
# 3.31, whose experimental `import std` gate value the project does not target,
# so an upstream CMake is installed from the Kitware tarball.

FROM debian:stable AS dev

ENV DEBIAN_FRONTEND=noninteractive

ARG APT_MIRROR=""
RUN if [ -n "$APT_MIRROR" ]; then \
        sed -i -e "s|http://deb.debian.org/debian|${APT_MIRROR}|g" \
               -e "s|http://security.debian.org/debian-security|${APT_MIRROR}|g" \
               /etc/apt/sources.list /etc/apt/sources.list.d/*.sources 2>/dev/null || true; \
    fi

RUN --mount=type=cache,target=/var/lib/apt,sharing=locked \
    --mount=type=cache,target=/var/cache/apt,sharing=locked \
    for attempt in 1 2 3 4 5; do \
        apt-get -o Acquire::Retries=5 update && break; \
        echo "apt-get update failed (attempt $attempt), retrying"; \
        sleep 5; \
    done \
    && apt-get -o Acquire::Retries=5 install -y --no-install-recommends \
        ca-certificates \
        clang-19 \
        clang-tools-19 \
        curl \
        dpkg-dev \
        file \
        libc++-19-dev \
        libc++abi-19-dev \
        libsdl3-dev \
        libunwind-19-dev \
        lld-19 \
        ninja-build \
        pkg-config \
        python3 \
    && rm -rf /var/lib/apt/lists/*

# Upstream CMake, because Debian 13's 3.31 experimental gate does not enable the
# `import std;` support the project relies on.
ARG CMAKE_VERSION=4.2.3
RUN mkdir -p /opt/cmake \
    && curl -fL "https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/cmake-${CMAKE_VERSION}-linux-x86_64.tar.gz" \
        | tar -xz -C /opt/cmake --strip-components=1
ENV PATH="/opt/cmake/bin:${PATH}"

ENV CC=clang-19
ENV CXX=clang++-19

WORKDIR /work
COPY . .

RUN cmake -S . -B build/debian -G Ninja \
        -DCMAKE_BUILD_TYPE=Release \
        -DCMAKE_CXX_STDLIB_MODULES_JSON=/usr/lib/llvm-19/lib/libc++.modules.json \
        -DOPENRA3_DISTRO_TAG=debian13 \
    && cmake --build build/debian -j \
    && ctest --test-dir build/debian --output-on-failure \
    && (cd build/debian && cpack -G DEB)

# deploy target: runtime dependencies + final binary, minimal and fast.
FROM debian:stable AS deploy

ENV DEBIAN_FRONTEND=noninteractive

RUN --mount=type=cache,target=/var/lib/apt,sharing=locked \
    --mount=type=cache,target=/var/cache/apt,sharing=locked \
    apt-get -o Acquire::Retries=5 update \
    &&     apt-get -o Acquire::Retries=5 install -y --no-install-recommends \
        libc++1-19 \
        libc++abi1-19 \
        libsdl3-0 \
        libvulkan1 \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /app
COPY --from=dev /work/build/debian/bin/openra3 /app/openra3

ENTRYPOINT ["/app/openra3"]