FROM python:3.10-slim

# Set working directory
WORKDIR /app

# Install dependencies (including PostgreSQL client for pg_isready)
RUN apt-get update && apt-get install -y \
    gcc \
    libpq-dev \
    postgresql-client \
    --no-install-recommends && \
    rm -rf /var/lib/apt/lists/*

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

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

# Copy the full application code
COPY . .

# Default command (or override via docker-compose)
CMD ["sh", "-c", "until pg_isready -h db -p 5432; do echo '[web] waiting for db…'; sleep 1; done && python app.py"]