FROM node:20-slim

WORKDIR /app

COPY frontend/package*.json ./
RUN npm ci --ignore-scripts

COPY frontend/ .

# Build the SvelteKit app (stub for Gate B — will be updated when SvelteKit scaffolds)
# For now, copy a stub HTML page. Vite build runs in production mode later.
RUN mkdir -p build && \
    echo '<!DOCTYPE html><html><head><meta charset="utf-8"><title>SlabUploader</title></head><body><h1>SlabUploader — coming soon</h1><p>SvelteKit app stub. Update this Dockerfile when the SvelteKit app is scaffolded.</p></body></html>' > build/index.html

EXPOSE 80

CMD ["node", "-e", "const h=require('http'),fs=require('fs'),url=require('url');h.createServer((req,res)=>{const f='build/index.html';res.writeHead(200,{'Content-Type':'text/html'}).end(fs.readFileSync(f))}).listen(80);console.log('frontend on :80')"]