# ============================================
# Chat Switchboard - Unified Dockerfile
# ============================================
# Stage 1: Build Go backend
# Stage 2: Build standalone frontend
# Stage 3: Production image (nginx + backend)
#
# nginx serves frontend on :80, proxies /api/ to Go on :8080
# ============================================

# ── 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: Frontend build ──────────────────
FROM alpine:3.19 AS frontend

WORKDIR /app
RUN apk add --no-cache bash coreutils

COPY build.sh ./
COPY src ./src

RUN chmod +x build.sh && ./build.sh

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

RUN apk add --no-cache bash

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

# Copy built frontend
COPY --from=frontend /app/standalone /usr/share/nginx/html

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

# Startup script: launches Go backend before nginx starts
COPY scripts/docker-entrypoint.sh /docker-entrypoint.d/90-start-backend.sh
RUN chmod +x /docker-entrypoint.d/90-start-backend.sh

EXPOSE 80