Dockerfile

# Dockerfile for Hugging Face Spaces (Next.js + FastAPI)

# -----------------------------------------------------------------------------
# Stage 1: Build Frontend (Node.js)
# -----------------------------------------------------------------------------
FROM node:20-alpine AS builder
WORKDIR /app

# Install dependencies
COPY package.json package-lock.json* ./
RUN npm ci

# Copy source code
COPY . .

# Build Next.js (Standalone output configured in next.config.js)
ENV NEXT_TELEMETRY_DISABLED 1
RUN npm run build

# -----------------------------------------------------------------------------
# Stage 2: Runtime (Python + Node.js)
# -----------------------------------------------------------------------------
FROM python:3.11-slim AS runner

# Install System Dependencies
# - ffmpeg: For audio processing
# - curl, gnupg: For installing Node.js
RUN apt-get update && apt-get install -y \
    ffmpeg \
    libsndfile1 \
    curl \
    gnupg \
    && rm -rf /var/lib/apt/lists/*

# Install Node.js 20 (LTS)
RUN mkdir -p /etc/apt/keyrings
RUN curl -fsSL https://deb.nodesource.com/gpgkey/nodesource-repo.gpg.key | gpg --dearmor -o /etc/apt/keyrings/nodesource.gpg
ENV NODE_MAJOR=20
RUN echo "deb [signed-by=/etc/apt/keyrings/nodesource.gpg] https://deb.nodesource.com/node_$NODE_MAJOR.x nodistro main" | tee /etc/apt/sources.list.d/nodesource.list
RUN apt-get update && apt-get install -y nodejs

# Set up Python Environment
WORKDIR /app
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1

# Install Python Dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# Copy Backend Source
COPY backend/ backend/

# Copy Frontend Build Artifacts from Builder
# We copy the standalone server and the static assets
COPY --from=builder /app/.next/standalone ./
COPY --from=builder /app/.next/static ./.next/static
COPY --from=builder /app/public ./public

# Copy Entry Point
COPY app.py .

# Create necessary temp directories for the application if needed
RUN mkdir -p /tmp/daw_audio_processing

# Create a non-root user for security (Optional but recommended for HF Spaces)
RUN useradd -m -u 1000 user
RUN chown -R user:user /app
USER user

# Expose the port HF Spaces expects
EXPOSE 7860

# Run the application manager
CMD ["python", "app.py"]