# Build stage: only wheels, no compilers in the final image.
FROM python:3.12-slim AS builder

ENV PIP_NO_CACHE_DIR=1 \
    PIP_DISABLE_PIP_VERSION_CHECK=1

RUN apt-get update && apt-get install -y --no-install-recommends \
        build-essential \
        libxml2-dev \
        libxslt1-dev \
        zlib1g-dev \
    && rm -rf /var/lib/apt/lists/*

RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt


# Runtime stage.
FROM python:3.12-slim

ENV PATH="/opt/venv/bin:$PATH" \
    PYTHONUNBUFFERED=1 \
    PLAYWRIGHT_BROWSERS_PATH=/ms-playwright \
    STORAGE_DIR=/tmp/html-to-pdf

# WeasyPrint needs cairo, pango and harfbuzz. The font packages cover Czech
# diacritics, without them the output silently falls back to boxes.
RUN apt-get update && apt-get install -y --no-install-recommends \
        libcairo2 \
        libpango-1.0-0 \
        libpangocairo-1.0-0 \
        libpangoft2-1.0-0 \
        libgdk-pixbuf-2.0-0 \
        libharfbuzz0b \
        libffi8 \
        shared-mime-info \
        fonts-dejavu \
        fonts-liberation2 \
        fonts-noto-core \
        fonts-noto-color-emoji \
        qpdf \
        ca-certificates \
        curl \
    && rm -rf /var/lib/apt/lists/*

COPY --from=builder /opt/venv /opt/venv

# Chromium plus its own system dependencies for the second render engine.
RUN playwright install --with-deps chromium \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /app
COPY app ./app

EXPOSE 8000

HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
    CMD curl -fsS http://127.0.0.1:8000/health || exit 1

CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]