# ============================================================
# LangChain SQL Agent Starter — Dockerfile
# Builds a container exposing the FastAPI service on port 8000.
# ============================================================

FROM python:3.11-slim

# --- System dependencies (SQLite included in Python slim image) ---
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    curl \
    && rm -rf /var/lib/apt/lists/*

# --- Create non-root user ------------------------------------
RUN useradd --create-home --shell /bin/bash appuser

WORKDIR /app

# --- Install Python dependencies first (cache layer) ---------
COPY requirements.txt .
RUN pip install --no-cache-dir --upgrade pip \
    && pip install --no-cache-dir -r requirements.txt

# --- Copy application code -----------------------------------
COPY config/ ./config/
COPY src/     ./src/
COPY api/     ./api/
COPY app/     ./app/
COPY scripts/ ./scripts/

# --- Create data directory -----------------------------------
RUN mkdir -p /app/data && chown appuser:appuser /app/data

# Switch to non-root user
USER appuser

# --- Health check --------------------------------------------
HEALTHCHECK --interval=30s --timeout=10s --start-period=15s --retries=3 \
    CMD curl -f http://localhost:8000/health || exit 1

# --- Environment defaults (override via .env or compose) -----
ENV PYTHONPATH=/app \
    PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    DATABASE_URL=sqlite:////app/data/demo.db \
    API_HOST=0.0.0.0 \
    API_PORT=8000

EXPOSE 8000

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