# Dockerfile for Hugging Face Spaces (All-in-One Free Hosting)
FROM python:3.10-slim

# Install system dependencies including Node.js (for React compilation), ffmpeg (for video/audio processing), and build-essential
RUN apt-get update && apt-get install -y --no-install-recommends \
    curl \
    gnupg \
    build-essential \
    ffmpeg \
    libgl1 \
    libglib2.0-0 \
    && rm -rf /var/lib/apt/lists/*

# Install Node.js (v18) to build React frontend
RUN curl -fsSL https://deb.nodesource.com/setup_18.x | bash - \
    && apt-get install -y nodejs \
    && rm -rf /var/lib/apt/lists/*

# Set up working directory
WORKDIR /workspace

# Set up Hugging Face user (HF spaces run as user ID 1000)
RUN useradd -m -u 1000 user
ENV HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH

# Install PyTorch CPU-only first (saves ~2GB of space and speeds up Hugging Face build)
RUN pip install --no-cache-dir torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cpu

# Pre-install retinaface-pytorch with --no-deps to bypass its strict, outdated torchvision==0.10.0 constraint
RUN pip install --no-cache-dir retinaface-pytorch==0.0.8 --no-deps

# Copy requirements and install python dependencies
# We filter out torch, torchvision, torchaudio, and retinaface-pytorch to avoid version-resolution conflicts
COPY requirements.txt .
RUN sed -i -E '/^(torch|torchvision|torchaudio|retinaface-pytorch)(>=|==)/d' requirements.txt && \
    pip install --no-cache-dir -r requirements.txt

# Force reinstall matching CPU versions of PyTorch to resolve any ABI mismatches introduced by requirements
RUN pip uninstall -y torch torchvision torchaudio && \
    pip install --no-cache-dir torch torchvision torchaudio --index-url https://download.pytorch.org/whl/cpu

# Purge duplicate legacy files and force reinstall typing-extensions and pydantic to avoid Sentinel ImportError
RUN pip uninstall -y typing-extensions pydantic pydantic-core && \
    rm -f /usr/local/lib/python3.10/site-packages/typing_extensions.py* && \
    pip install --no-cache-dir -U typing-extensions pydantic pydantic-core

# Copy source code and app
COPY src ./src
COPY app/backend ./app/backend
COPY app/frontend ./app/frontend

# Build the React frontend
WORKDIR /workspace/app/frontend
RUN npm install
RUN npm run build

# Change working directory back to root
WORKDIR /workspace

# Set permissions for the Hugging Face user
RUN chown -R user:user /workspace
USER user

# Set environment variables
ENV PYTHONPATH=/workspace/src:/workspace/app/backend

# Expose port 7860 (Hugging Face Spaces default port)
EXPOSE 7860

# Run FastAPI backend using uvicorn on port 7860
CMD ["uvicorn", "app.backend.main:app", "--host", "0.0.0.0", "--port", "7860"]