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

WORKDIR /app/frontend
COPY frontend/package*.json ./
RUN npm install
COPY frontend/ .
RUN npm run build

# ── Stage 2: Python runtime + nginx + supervisord ─────────────────────────────
FROM python:3.11-slim

# Install nginx, supervisor, and build tools
RUN apt-get update && apt-get install -y --no-install-recommends \
    nginx \
    supervisor \
    build-essential \
    curl \
    && rm -rf /var/lib/apt/lists/*

# Install uv
RUN pip install --no-cache-dir uv

# Copy backend dependency spec (layer cache)
WORKDIR /app/backend
COPY backend/pyproject.toml .

# Install CPU-only torch first (reduces resolver backtracking)
RUN uv pip install --system --no-cache \
    torch --index-url https://download.pytorch.org/whl/cpu

# Install all remaining backend dependencies
RUN uv pip install --system --no-cache -e .

# Copy full backend source
COPY backend/ /app/backend/

# Bake ML models at build time → zero cold-start wait for embedder + reranker
RUN python -c "\
from sentence_transformers import SentenceTransformer, CrossEncoder; \
SentenceTransformer('sentence-transformers/all-MiniLM-L6-v2'); \
CrossEncoder('cross-encoder/ms-marco-MiniLM-L-6-v2'); \
print('Models baked into image.')"

# Copy React build output from stage 1
COPY --from=frontend-builder /app/frontend/dist /usr/share/nginx/html

# nginx + supervisord config
COPY nginx.hf.conf /etc/nginx/conf.d/default.conf
COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf

# HF Spaces runs as non-root (UID 1000); nginx needs writable pid + temp paths
RUN sed -i 's|pid /var/run/nginx.pid;|pid /tmp/nginx.pid;|' /etc/nginx/nginx.conf && \
    sed -i '/http {/a\    client_body_temp_path /tmp/client_body;\n    proxy_temp_path /tmp/proxy;\n    fastcgi_temp_path /tmp/fastcgi;' /etc/nginx/nginx.conf && \
    mkdir -p /tmp/client_body /tmp/proxy /tmp/fastcgi && \
    chown -R 1000:1000 /tmp/client_body /tmp/proxy /tmp/fastcgi /usr/share/nginx/html && \
    chown -R 1000:1000 /var/log/nginx /var/lib/nginx || true

# Entrypoint script
COPY entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh

# HF Spaces requires port 7860
EXPOSE 7860

CMD ["/entrypoint.sh"]