# Stage 1: Build frontend
FROM node:22-alpine AS frontend
WORKDIR /app/frontend
COPY frontend/package.json frontend/package-lock.json* ./
RUN npm install
COPY frontend/ ./
RUN npm run build

# Stage 2: Build Go binary
FROM golang:1.24-alpine AS backend
WORKDIR /app
COPY go.mod go.sum ./
RUN go mod download
COPY . .
COPY --from=frontend /app/dist ./dist
RUN CGO_ENABLED=0 go build -o energy-frontend .

# Stage 3: Minimal runtime
FROM alpine:3.21
RUN apk add --no-cache ca-certificates tzdata
WORKDIR /app
COPY --from=backend /app/energy-frontend .
EXPOSE 8080
USER nobody:nobody
ENTRYPOINT ["./energy-frontend"]