# Multi-stage build for optimized production image
FROM python:3.11-slim as builder

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    PIP_DISABLE_PIP_VERSION_CHECK=1

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

# Create virtual environment
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

# Copy requirements and install Python dependencies
COPY requirements.txt /tmp/
RUN pip install --upgrade pip && \
    pip install -r /tmp/requirements.txt

# Production stage
FROM python:3.11-slim as production

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    FLASK_ENV=production \
    PATH="/opt/venv/bin:$PATH"

# Install runtime dependencies
RUN apt-get update && apt-get install -y \
    libpq5 \
    curl \
    && rm -rf /var/lib/apt/lists/* \
    && apt-get clean

# Create non-root user
RUN groupadd -r rateright && useradd -r -g rateright rateright

# Copy virtual environment from builder stage
COPY --from=builder /opt/venv /opt/venv

# Set work directory
WORKDIR /app

# Copy application code
COPY --chown=rateright:rateright . .

# Create necessary directories
RUN mkdir -p /app/logs /app/uploads /app/instance && \
    chown -R rateright:rateright /app

# Switch to non-root user
USER rateright

# Expose port
EXPOSE 8080

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
    CMD curl -f http://localhost:8080/api/health || exit 1

# Run gunicorn with optimized settings
CMD ["gunicorn", \
     "--bind", "0.0.0.0:8080", \
     "--workers", "4", \
     "--timeout", "120", \
     "--keep-alive", "2", \
     "--log-level", "info", \
     "--access-logfile", "-", \
     "--error-logfile", "-", \
     "--capture-output", \
     "run:app"]