# Backend Dockerfile for Paper Dynasty Game Engine
# Multi-stage build for optimized production image

FROM python:3.13-slim as base

# Set environment variables
ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    UV_LINK_MODE=copy \
    UV_COMPILE_BYTECODE=1 \
    UV_PYTHON_DOWNLOADS=never

# Install system dependencies and UV
RUN apt-get update && apt-get install -y \
    curl \
    postgresql-client \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Install UV
COPY --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/uv

# Create app directory
WORKDIR /app

# Development stage
FROM base as development

# Copy dependency files (including README.md referenced in pyproject.toml)
COPY pyproject.toml uv.lock README.md ./

# Install all dependencies (including dev)
RUN uv sync --frozen

# Copy application code
COPY . .

# Expose port
EXPOSE 8000

# Run with uvicorn reload for development
CMD ["uv", "run", "python", "-m", "uvicorn", "app.main:socket_app", "--host", "0.0.0.0", "--port", "8000", "--reload"]

# Production stage
FROM base as production

# Copy dependency files (including README.md referenced in pyproject.toml)
COPY pyproject.toml uv.lock README.md ./

# Install production dependencies only
RUN uv sync --frozen --no-dev

# Create non-root user
RUN useradd -m -u 1000 appuser && \
    chown -R appuser:appuser /app

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

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:8000/api/health || exit 1

# Run with production server
# NOTE: Using single worker because in-memory state_manager cannot be shared across workers.
# Multiple workers would require Redis or another shared state store.
CMD ["uv", "run", "python", "-m", "uvicorn", "app.main:socket_app", "--host", "0.0.0.0", "--port", "8000", "--workers", "1"]