# ── Stage 1: Build FFmpeg with DeckLink + NVENC (HEVC/H264) support ─────────
# All-Intra HEVC NVENC is the master codec for growing-file ingest (see
# docs/design/2026-05-29-all-intra-hevc-ingest.md).  This stage gets the
# nv-codec-headers (header-only, no driver / no full CUDA toolkit needed)
# so ffmpeg's configure can light up hevc_nvenc / h264_nvenc / cuvid.
# At runtime, /dev/nvidia* + the host driver libs (via the NVIDIA Container
# Toolkit) supply the actual encoder.
FROM debian:bookworm AS ffmpeg-builder

RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential nasm yasm pkg-config git ca-certificates python3 \
    libssl-dev libx264-dev libx265-dev libvpx-dev libopus-dev \
    libmp3lame-dev libsrt-openssl-dev \
    libzmq3-dev zlib1g-dev libstdc++-12-dev \
  && rm -rf /var/lib/apt/lists/*

# Copy in BMD DeckLink SDK headers and patch script
COPY sdk/ /decklink-sdk/
COPY patch_decklink.py /patch_decklink.py
COPY decklink-sdk16.patch /decklink-sdk16.patch

# nv-codec-headers — just the ffnvcodec public headers + a pkg-config file.
# Pin to a tag known to work with FFmpeg 7.1 (n12.x series).
RUN git clone --depth=1 --branch n12.1.14.0 https://github.com/FFmpeg/nv-codec-headers.git /nv-codec-headers \
  && make -C /nv-codec-headers PREFIX=/usr/local install

# Pull FFmpeg 7.1 source
RUN git clone --depth=1 --branch release/7.1 https://git.ffmpeg.org/ffmpeg.git /ffmpeg

# Patch FFmpeg DeckLink code for SDK 16.x API changes
RUN python3 /patch_decklink.py

WORKDIR /ffmpeg
# NVENC adds: --enable-nvenc (encoder), --enable-cuvid (decoder), --enable-ffnvcodec.
# We deliberately do NOT enable --enable-cuda-nvcc / --enable-libnpp here — those
# require the full ~3GB CUDA toolkit and are only needed for GPU filters like
# yadif_cuda / scale_cuda.  If §5's GPU deinterlace stretch goal goes ahead,
# rebuild this image off nvidia/cuda:12.x-devel and flip those flags on.
RUN ./configure \
      --prefix=/usr/local \
      --pkg-config-flags="--static" \
      --extra-cflags="-I/decklink-sdk -I/usr/local/include" \
      --extra-ldflags="-L/usr/local/lib" \
      --enable-gpl \
      --enable-nonfree \
      --enable-libx264 \
      --enable-libx265 \
      --enable-libvpx \
      --enable-libopus \
      --enable-libmp3lame \
      --enable-libsrt \
      --enable-libzmq \
      --enable-decklink \
      --enable-ffnvcodec \
      --enable-nvenc \
      --enable-cuvid \
      --disable-doc \
      --disable-debug \
      --disable-ffplay \
  && make -j$(nproc) \
  && make install

# Sanity-check: hevc_nvenc and h264_nvenc must be present in the encoder list,
# otherwise the resulting image is useless for the All-Intra HEVC pipeline.
RUN /usr/local/bin/ffmpeg -hide_banner -encoders 2>&1 | grep -E 'nvenc' \
  || (echo 'FATAL: nvenc encoders missing from ffmpeg build' && exit 1)

# ── Stage 2: Runtime image ───────────────────────────────────────────────────
FROM node:20-bookworm

# Runtime deps for compiled ffmpeg libs
RUN apt-get update && apt-get install -y --no-install-recommends \
    libx264-164 libx265-199 libvpx7 libopus0 libmp3lame0 \
    libsrt1.5-openssl libzmq5 libstdc++6 libc++1 libc++abi1 \
  && rm -rf /var/lib/apt/lists/*

# Copy compiled ffmpeg/ffprobe
COPY --from=ffmpeg-builder /usr/local/bin/ffmpeg  /usr/local/bin/ffmpeg
COPY --from=ffmpeg-builder /usr/local/bin/ffprobe /usr/local/bin/ffprobe
COPY --from=ffmpeg-builder /usr/local/lib/        /usr/local/lib/

# DeckLink runtime .so
COPY lib/libDeckLinkAPI.so        /usr/lib/libDeckLinkAPI.so
COPY lib/libDeckLinkPreviewAPI.so /usr/lib/libDeckLinkPreviewAPI.so
RUN ldconfig

# Mount points the recorder lifecycle expects to exist.
# /live      — HLS preview output (bound from host LIVE_DIR by node-agent)
# /growing   — growing-file master output (bound from host /mnt/NVME/MAM/growing)
RUN mkdir -p /live /growing

WORKDIR /app
COPY package*.json ./
RUN npm install --omit=dev
COPY . .

EXPOSE 3001
CMD ["node", "src/index.js"]