# Multi-stage Dockerfile for WealthWise Backend
# Stage 1: Builder - Install dependencies and export requirements
# Stage 2: Runtime - Slim production image

# ==========================================
# STAGE 1: Builder
# ==========================================
FROM python:3.11-slim as builder

WORKDIR /build

# Install system dependencies for building Python packages
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    libpq-dev \
    && rm -rf /var/lib/apt/lists/*

# Install Poetry
RUN pip install --no-cache-dir poetry==1.7.1

# Copy Poetry configuration
COPY pyproject.toml ./

# Configure Poetry to not create a virtual environment
# and export dependencies to requirements.txt
RUN poetry config virtualenvs.create false && \
    poetry export -f requirements.txt --output requirements.txt --without-hashes --only main

# ==========================================
# STAGE 2: Runtime
# ==========================================
FROM python:3.11-slim as runtime

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

WORKDIR /app

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

# Create non-root user for security
RUN useradd --create-home --shell /bin/bash app && \
    chown -R app:app /app
USER app

# Copy requirements from builder stage
COPY --from=builder /build/requirements.txt .

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

# Copy application code
COPY --chown=app:app app/ ./app/

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=30s --start-period=5s --retries=3 \
    CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8000/api/v1/health')" || exit 1

# Run the application with uvicorn
# Using multiple workers for production (adjust based on CPU cores)
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "4"]