# Production Dockerfile Template
# Customize for your application

# ==============================================================================
# Build Stage
# ==============================================================================
FROM python:3.11-slim AS builder

WORKDIR /app

# Install build dependencies (if needed)
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

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

# Install Python dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir --upgrade pip \
    && pip install --no-cache-dir -r requirements.txt

# ==============================================================================
# Production Stage
# ==============================================================================
FROM python:3.11-slim

WORKDIR /app

# Install runtime dependencies only
RUN apt-get update && apt-get install -y --no-install-recommends \
    # Add runtime dependencies here (e.g., libpq5 for postgres)
    curl \
    && rm -rf /var/lib/apt/lists/*

# Copy virtual environment from builder
COPY --from=builder /opt/venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

# Create non-root user
RUN groupadd --gid 1000 appgroup \
    && useradd --uid 1000 --gid appgroup --shell /bin/bash --create-home appuser

# Set ownership
RUN chown -R appuser:appgroup /app

# Switch to non-root user
USER appuser

# Copy application code
COPY --chown=appuser:appgroup src/ ./src/

# Environment variables
ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PORT=8000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
    CMD curl -f http://localhost:${PORT}/health || exit 1

# Expose port
EXPOSE ${PORT}

# Run application
CMD ["python", "-m", "uvicorn", "src.main:app", "--host", "0.0.0.0", "--port", "8000"]