# Build stage
FROM debian:13@sha256:9c6e381421d0f48d1b8133e573f33c185ee16cbf505eda9c4a8a4791b25ea8a6 AS builder

RUN apt-get update && apt-get install -y \
    build-essential \
    cmake \
    git \
    libcurl4-gnutls-dev \
    liblzma-dev \
    liblzo2-dev \
    libpng-dev \
    libzstd-dev \
    zlib1g-dev \
    pkg-config \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /src
COPY OpenTTD-patches /src/OpenTTD-patches

WORKDIR /src/OpenTTD-patches/build
RUN cmake .. \
    -DCMAKE_BUILD_TYPE=Release \
    -DOPTION_DEDICATED=ON \
    -DOPTION_INSTALL_HTML_DOCS=OFF \
    -DOPTION_USE_ASSERTS=OFF \
    && make -j$(nproc) install

# Runtime stage
# Must track the builder's Debian release: the builder (debian:13/trixie) links
# against glibc 2.38+, so an older runtime (e.g. bookworm, glibc 2.36) cannot run
# the resulting binary. Package names use the trixie t64 spelling.
FROM debian:trixie-slim@sha256:f6b08b09a05725f9431502d3b5714f5c4576e82c1a84fa1debe0c24a7e0c3ec4

RUN apt-get update && apt-get install -y \
    libcurl3t64-gnutls \
    liblzma5 \
    liblzo2-2 \
    libpng16-16t64 \
    libzstd1 \
    zlib1g \
    ca-certificates \
    openttd-opengfx \
    && rm -rf /var/lib/apt/lists/*

# Copy binaries from builder
COPY --from=builder /usr/local/games/openttd /usr/local/bin/openttd
COPY --from=builder /usr/local/share/games/openttd /usr/local/share/games/openttd

# Ensure base graphics are in a path openttd searches
RUN mkdir -p /usr/local/share/games/openttd/baseset && \
    cp -r /usr/share/games/openttd/baseset/* /usr/local/share/games/openttd/baseset/

# Create openttd user
RUN useradd -m -u 1000 openttd
USER openttd
WORKDIR /home/openttd

# Create config directory
RUN mkdir -p /home/openttd/.local/share/openttd/save

EXPOSE 3979/tcp 3979/udp 3977/tcp

CMD ["openttd", "-D"]