# syntax=docker/dockerfile:1.4

# --- Stage 1: Build Dependencies ---
# Using a specific, stable Python version on Alpine for a small final image.
FROM python:3.10-alpine3.18 AS builder

WORKDIR /app

# Install build dependencies for Python packages.
RUN apk add --no-cache --virtual .build-deps \
    build-base \
    gcc \
    musl-dev \
    python3-dev \
    linux-headers

# Copy only the requirements file first to leverage Docker's build cache.
COPY requirements.txt .

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

# Remove build dependencies to keep the final image lean.
RUN apk del .build-deps

# --- Stage 2: Runtime Environment ---
# Start fresh with a lean Alpine Python image.
FROM python:3.10-alpine3.18

WORKDIR /app

# Copy installed Python packages from the builder stage.
COPY --from=builder /usr/local/lib/python3.10/site-packages /usr/local/lib/python3.10/site-packages
COPY --from=builder /usr/local/bin /usr/local/bin

# Set environment variables for Python.
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1

# Copy the configuration directory first.
# If only code changes, this layer remains cached.
COPY config ./config
COPY llm ./llm
COPY app ./app


# Copy your application source code.
COPY main.py .
COPY config.py .
COPY shared_store.py .

# Expose the port your application listens on.
EXPOSE 8000

# Define the command to run your application.
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]