# Multi-stage build for production - optimized for size
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 build dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    g++ \
    libpq-dev \
    && rm -rf /var/lib/apt/lists/*

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

# Production stage - minimal image
FROM python:3.11-slim AS production

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PATH=/home/appuser/.local/bin:$PATH

# Install only runtime dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    libpq5 \
    curl \
    && rm -rf /var/lib/apt/lists/* \
    && apt-get clean

# Create non-root user
RUN groupadd -g 1001 appuser && \
    useradd -u 1001 -g appuser -m appuser

# Copy Python packages from builder stage
COPY --from=builder /root/.local /home/appuser/.local

# Set working directory
WORKDIR /app

# Copy only necessary application files (be selective)
COPY --chown=appuser:appuser app/ ./app/
COPY --chown=appuser:appuser alembic/ ./alembic/
COPY --chown=appuser:appuser alembic.ini ./
COPY --chown=appuser:appuser *.py ./
COPY --chown=appuser:appuser requirements.txt ./

# Create logs directory
RUN mkdir -p /app/logs && chown -R appuser:appuser /app

# Switch to non-root user
USER appuser

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
    CMD curl -f http://localhost:8000/health || exit 1

# Expose port
EXPOSE 8000

# Production command
CMD ["uvicorn", "app.main:app", \
    "--host", "0.0.0.0", \
    "--port", "8000", \
    "--workers", "4", \
    "--access-log", \
    "--log-level", "info"]