# =============================================================================
# Multi-stage Dockerfile for the Client CRM + KB API
# =============================================================================

# ---------------------------------------------------------------------------
# Stage 1: Builder – install Python dependencies into a virtual environment
# ---------------------------------------------------------------------------
FROM python:3.11-slim AS builder

WORKDIR /build

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

# Create a virtual environment so we can copy it cleanly to the runtime image
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"

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

# ---------------------------------------------------------------------------
# Stage 2: Runtime – lean image with only what is needed to run the API
# ---------------------------------------------------------------------------
FROM python:3.11-slim AS runtime

WORKDIR /app

# Runtime system libraries (asyncpg / psycopg need libpq)
RUN apt-get update && \
    apt-get install -y --no-install-recommends libpq5 curl && \
    rm -rf /var/lib/apt/lists/*

# Copy the virtual environment from the builder stage
COPY --from=builder /opt/venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH" \
    PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1

# Copy application source code
COPY . .

# Expose the default uvicorn port
EXPOSE 8000

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

# Run the application with uvicorn
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "4"]