# Use an official Python runtime as a base
FROM python:3.11-slim-buster

# Set working directory
WORKDIR /app

# Install system dependencies
RUN apt-get update && apt-get install -y \
    build-essential \
    libpq-dev \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first to leverage Docker cache
COPY requirements.txt .

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

# Copy application code
COPY . .

# Environment variables
ENV FLASK_APP=app.py
ENV FLASK_ENV=production
ENV ENVIRONMENT=production

EXPOSE 5001

# Use Gunicorn as production server
CMD ["gunicorn", "--bind", "0.0.0.0:5001", "--workers", "4", "--timeout", "120", "app:app"]