# --- Use Python 3.10 as the base image for modern syntax compatibility ---
    FROM python:3.10-slim

    # Set the working directory inside the container
    WORKDIR /code
    
    # Set environment variables for cache directories
    ENV MPLCONFIGDIR=/tmp/matplotlib
    ENV HF_HOME=/tmp/huggingface
    ENV NUMBA_CACHE_DIR=/tmp/numba_cache
    ENV PYTHONUNBUFFERED=1
    ENV FONTCONFIG_PATH=/tmp/fonts
    ENV FONTCONFIG_CACHE=/tmp/fonts-cache
    ENV LHOTSE_CACHE=/tmp/.lhotse
    ENV XDG_CACHE_HOME=/tmp
    ENV HOME=/tmp
    ENV LHOTSE_TOOLS=/tmp/.lhotse
    
    # --- Install system dependencies ---
    RUN apt-get update && \
        apt-get install -y --no-install-recommends \
        libsndfile1 \
        ffmpeg \
        build-essential \
        git \
        fontconfig \
        && apt-get clean \
        && rm -rf /var/lib/apt/lists/*
    
    # Copy the requirements file
    COPY ./requirements.txt /code/requirements.txt
    
    # --- Install Python dependencies ---
    # Upgrade pip first
    RUN pip install --no-cache-dir --upgrade pip setuptools wheel
    
    # Install PyTorch with its specific index-url INSTALL FIRST BEFORE REQUIREMENTS.TXT
    RUN pip install --no-cache-dir \
        --index-url https://download.pytorch.org/whl/cpu \
        torch==2.1.0 \
        torchaudio==2.1.0
    
    # Install all other requirements from the file in a single step
    # Use --use-deprecated=legacy-resolver if dependency conflicts are complex
    RUN pip install --no-cache-dir -r /code/requirements.txt
    
    # Verify the installed versions (optional but good practice)
    RUN python -c "import torch; print(f'PyTorch: {torch.__version__}')"
    RUN python -c "import pytorch_lightning as pl; print(f'PyTorch Lightning: {pl.__version__}')"
    RUN python -c "import nemo; print(f'NeMo: {nemo.__version__}')"
    
    # Create cache directories with proper permissions
    RUN mkdir -p /tmp/matplotlib /tmp/huggingface /tmp/numba_cache /tmp/.lhotse /tmp/fonts /tmp/fonts-cache && \
        chmod -R 777 /tmp
    
    # Fix fontconfig cache directory
    RUN fc-cache -fv
    
    # Copy the rest of your application code
    COPY . /code/
    
    # Expose port
    EXPOSE 7860
    
    # Run the application
    CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]