# =============================================================================
# Multi-stage Dockerfile for Streaming ASR Client with Triton
# 
# Stage 1: Build React frontend
# Stage 2: Python runtime with static files
#
# Required environment variables:
#   - NGC_API_KEY: NVIDIA NGC API key for authentication
#   - FUNCTION_ID: NVCF function ID
#   - VERSION_ID: (optional) NVCF function version ID
# =============================================================================

# -----------------------------------------------------------------------------
# Stage 1: Build the React frontend
# -----------------------------------------------------------------------------
FROM node:20-alpine AS frontend-builder

WORKDIR /app/web

# Install dependencies first (better caching)
COPY web/package.json ./
RUN npm install

# Copy source and build
COPY web/ ./
RUN npm run build

# Output will be in /app/web/dist/

# -----------------------------------------------------------------------------
# Stage 2: Python runtime
# -----------------------------------------------------------------------------
FROM python:3.11-slim

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE=1 \
    PYTHONUNBUFFERED=1 \
    PYTHONPATH=/app

WORKDIR /app

# Install system dependencies (ffmpeg and libsndfile for audio processing)
RUN apt-get update && apt-get install -y --no-install-recommends \
    ffmpeg \
    libsndfile1 \
    && rm -rf /var/lib/apt/lists/*

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

# Copy Python application
COPY bridge/ ./bridge/

# Copy built frontend from stage 1
COPY --from=frontend-builder /app/web/dist ./static/

# Create non-root user for security
RUN useradd --create-home --shell /bin/bash appuser && \
    chown -R appuser:appuser /app
USER appuser

# Expose the application port
EXPOSE 8080

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8080/health')" || exit 1

# Run the application
CMD ["python", "-m", "bridge.main"]