# Multi-stage Dockerfile Template for FastAPI Services
# Based on BlackRoad OS best practices

# =============================================================================
# Stage 1: Build stage
# =============================================================================
FROM python:3.11-slim as builder

WORKDIR /build

# Install build dependencies
RUN apt-get update && apt-get install -y \
    gcc \
    postgresql-client \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements and install dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir --user -r requirements.txt

# =============================================================================
# Stage 2: Runtime stage
# =============================================================================
FROM python:3.11-slim

WORKDIR /app

# 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 for security
RUN useradd -m -u 1000 appuser && \
    chown -R appuser:appuser /app

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

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

# Make sure scripts in .local are usable
ENV PATH=/home/appuser/.local/bin:$PATH

# Switch to non-root user
USER appuser

# Health check
HEALTHCHECK --interval=30s --timeout=5s --start-period=60s --retries=3 \
    CMD curl -f http://localhost:${PORT:-8000}/health || exit 1

# Expose port (Railway will override with $PORT)
EXPOSE 8000

# Start command
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]