# Use lightweight Python image
FROM python:3.11-slim

# Set working directory
WORKDIR /app

# Install system dependencies (optional but safe for pandas)
RUN apt-get update && apt-get install -y \
    gcc \
    && rm -rf /var/lib/apt/lists/*

# Copy only requirements first (better layer caching)
COPY requirements.txt .

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

# Copy application files
COPY . .

# Expose ports
EXPOSE 4840
EXPOSE 7860

# Run the app
CMD ["python", "csv_opcua_server.py"]