FROM python:3.11-slim

# ── System packages ──────────────────────────────────────────────────────────
# espeak-ng + libsndfile1: required by piper-tts at runtime
# build-essential + cmake + git: required to compile llama-cpp-python from source
RUN apt-get update && apt-get install -y --no-install-recommends \
    espeak-ng \
    libsndfile1 \
    ffmpeg \
    build-essential \
    cmake \
    git \
    pkg-config \
    && rm -rf /var/lib/apt/lists/*

# ── HF Spaces requirement: non-root user uid 1000 ────────────────────────────
RUN useradd -m -u 1000 user
USER user
ENV HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH \
    PYTHONUNBUFFERED=1

WORKDIR /home/user/app

# ── Python dependencies ───────────────────────────────────────────────────────
# CMAKE_BUILD_PARALLEL_LEVEL=1 limits llama-cpp-python C++ compilation to a
# single parallel job, reducing peak RAM from ~12 GB (all CPUs) to ~3 GB.
# Without this the build container is OOMKilled before compilation finishes.
COPY --chown=user requirements.txt .
ENV CMAKE_BUILD_PARALLEL_LEVEL=1
RUN pip install --no-cache-dir -r requirements.txt

# ── Application ───────────────────────────────────────────────────────────────
COPY --chown=user . .

EXPOSE 7860
CMD ["python", "app.py"]