# ============================================
# Chat Switchboard v0.5 - Unified Dockerfile
# ============================================
# Stage 1: Build Go backend
# Stage 2: Download JS vendor libs (marked, DOMPurify)
# Stage 3: Production image (nginx + backend)
#
# Vendor libs are baked in during build so the
# app works in disconnected environments
# with no CDN access.
# ============================================

# ── Stage 1: Go backend build ────────────────
FROM golang:1.22-bookworm AS backend

WORKDIR /app
COPY server/go.mod server/go.sum* ./
COPY server/ .
RUN go mod download && go mod tidy && go mod verify
RUN CGO_ENABLED=0 go build -ldflags="-s -w" -o /bin/switchboard .

# ── Stage 2: Vendor JS libs ─────────────────
FROM node:20-alpine AS vendor

WORKDIR /vendor
RUN npm pack marked@16.3.0 && \
    tar xzf marked-16.3.0.tgz && \
    cp package/lib/marked.umd.js marked.min.js && \
    rm -rf package marked-16.3.0.tgz

RUN npm pack dompurify@3.2.4 && \
    tar xzf dompurify-3.2.4.tgz && \
    cp package/dist/purify.min.js purify.min.js && \
    rm -rf package dompurify-3.2.4.tgz

# ── Stage 3: Production ─────────────────────
FROM nginx:1-alpine

RUN apk add --no-cache bash

# Go backend binary
COPY --from=backend /bin/switchboard /usr/local/bin/switchboard

# Frontend static files
COPY src/ /usr/share/nginx/html/

# Vendor libs (overwrite any existing copies in src/vendor/)
COPY --from=vendor /vendor/marked.min.js /usr/share/nginx/html/vendor/marked.min.js
COPY --from=vendor /vendor/purify.min.js /usr/share/nginx/html/vendor/purify.min.js

# nginx config
COPY nginx.conf /etc/nginx/conf.d/default.conf

# Entrypoint: start Go backend, then nginx
COPY docker-entrypoint.sh /docker-entrypoint.d/90-start-backend.sh
RUN chmod +x /docker-entrypoint.d/90-start-backend.sh

EXPOSE 80