# Use Python 3.8 slim image
FROM python:3.8-slim

# Set working directory
WORKDIR /app

# Install system dependencies required for ML libraries
RUN apt-get update && apt-get install -y \
    gcc \
    g++ \
    wget \
    && rm -rf /var/lib/apt/lists/*

# Upgrade pip to version 25 (latest available)
RUN pip install --upgrade pip

# Copy requirements first for better caching
COPY requirements_docker.txt .

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

# Download NLTK data
RUN python -c "import nltk; nltk.download('punkt'); nltk.download('stopwords')"

# Copy application code
COPY . .

# Create necessary directories for file uploads and static files
RUN mkdir -p static/files

# Set environment variables
ENV FLASK_APP=app.py
ENV FLASK_ENV=production
ENV PYTHONUNBUFFERED=1

# Expose port
EXPOSE 8080

# Create non-root user for security
RUN useradd --create-home --shell /bin/bash app \
    && chown -R app:app /app
USER app

# Command to run the application
CMD ["python", "-m", "gunicorn", "--bind", "0.0.0.0:8080", "--workers", "1", "--timeout", "120", "app:app"]