FROM python:3.9-slim

WORKDIR /app

# Install comprehensive system dependencies for pygrib and GRIB processing
RUN apt-get update && apt-get install -y \
    libeccodes-dev \
    libproj-dev \
    libgeos-dev \
    libjpeg-dev \
    libpng-dev \
    libopenjp2-7-dev \
    libaec-dev \
    libnetcdf-dev \
    libhdf5-dev \
    libhdf5-serial-dev \
    zlib1g-dev \
    cmake \
    pkg-config \
    gcc \
    g++ \
    gfortran \
    build-essential \
    python3-dev \
    cython3 \
    libssl-dev \
    libffi-dev \
    libbz2-dev \
    liblzma-dev \
    curl \
    wget \
    git \
    && rm -rf /var/lib/apt/lists/*

# Set critical environment variables for eccodes and pygrib
ENV ECCODES_DIR=/usr
ENV ECCODES_DEFINITION_PATH=/usr/share/eccodes/definitions

# Create non-root user for Hugging Face Spaces
RUN useradd -m -u 1000 user
USER user
ENV HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH

WORKDIR $HOME/app

# Copy requirements and install Python packages
COPY --chown=user requirements.txt .

# Install Python packages (pygrib is the key for real Arctic extraction)
RUN pip install --no-cache-dir --user -r requirements.txt

# Copy application files
COPY --chown=user . .

# Expose port 7860 for Hugging Face Spaces
EXPOSE 7860

# Set environment variables for the application
ENV PYTHONPATH="${PYTHONPATH}:${HOME}/app"
ENV GRADIO_SERVER_NAME="0.0.0.0"
ENV GRADIO_SERVER_PORT=7860

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