# Build stage
FROM python:3.12-slim as builder

WORKDIR /app

RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    libpq-dev \
    && rm -rf /var/lib/apt/lists/*

RUN groupadd -r appuser && useradd -r -g appuser -d /app -s /sbin/nologin appuser

COPY requirements.txt .
RUN pip install --no-cache-dir --user -r requirements.txt

# Application stage
FROM python:3.12-slim

WORKDIR /app

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

COPY --from=builder /root/.local /app/.local

ENV PATH=/app/.local/bin:$PATH

RUN groupadd -r appuser && useradd -r -g appuser -d /app -s /sbin/nologin appuser

RUN mkdir -p /app/data /app/uploads /app/logs /app/scripts && chown -R appuser:appuser /app

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

# Copy interaction pipeline scripts
COPY --chown=appuser:appuser scripts/ ./scripts/
RUN chmod +x /app/scripts/*.py

COPY --chown=appuser:appuser .env.example ./.env.example
COPY --chown=appuser:appuser pyproject.toml ./

ENV PYTHONPATH=/app
ENV PYTHONUNBUFFERED=1
ENV PYTHONDONTWRITEBYTECODE=1

HEALTHCHECK --interval=30s --timeout=20s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:8000/health || exit 1

USER appuser

EXPOSE 8000

CMD ["python", "-m", "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]
