# Multi-stage build for Python API

# Stage 1: Builder
FROM python:3.10-slim as builder

# Set working directory
WORKDIR /build

# Install system dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    g++ \
    make \
    libpq-dev \
    libssl-dev \
    libffi-dev \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements
COPY requirements.txt .

# Create virtual environment and install dependencies
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"
RUN pip install --no-cache-dir --upgrade pip setuptools wheel && \
    pip install --no-cache-dir -r requirements.txt

# Stage 2: Runtime
FROM python:3.10-slim

# Set working directory
WORKDIR /app

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

# Copy virtual environment from builder
COPY --from=builder /opt/venv /opt/venv

# Set environment variables
ENV PATH="/opt/venv/bin:$PATH" \
    PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    FLASK_APP=run.py

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

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

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 5000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
    CMD curl -f http://localhost:5000/health || exit 1

# Default command
CMD ["gunicorn", "--bind", "0.0.0.0:5000", "--workers", "4", "--threads", "2", "--timeout", "120", "--worker-class", "gevent", "--access-logfile", "-", "--error-logfile", "-", "run:app"]