FROM python:3.11-slim

WORKDIR /app

# Copy requirements first for better caching
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy all application files
COPY . .

# Ensure proper permissions
RUN chmod +x app.py

EXPOSE 5000

# Use python module syntax for better reliability
CMD ["python", "-u", "app.py"]