# Base Python image
FROM python:3.10-slim

# Environment settings to avoid Python cache & force unbuffered output
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

# Set working directory
WORKDIR /app

# Install system dependencies (for building some Python packages)
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    gcc \
    g++ \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first (better Docker caching)
COPY requirements.txt requirements.txt

# Install Python dependencies
RUN pip install --no-cache-dir -r requirements.txt gunicorn

# Copy the entire project (including subfolders)
COPY . .

# Hugging Face Spaces default exposed port
EXPOSE 7860

# Run Flask with Gunicorn for parallel processing
# app:app means 'app.py' file and 'app' Flask instance inside it
CMD ["gunicorn", "--workers", "4", "--threads", "12", "--bind", "0.0.0.0:7860", "app:app"]