# ==================================================
# MULTI-STAGE DOCKERFILE - FRONTEND (Next.js 14)
# Next.js App Router + TypeScript + TailwindCSS
# ==================================================

# --------------------------------------------------
# STAGE 1: Dependencies
# --------------------------------------------------
FROM node:20-alpine AS deps
WORKDIR /app

# Install build dependencies for native modules
RUN apk add --no-cache libc6-compat

# Copy package files
COPY frontend/package*.json ./

# Install dependencies
RUN npm ci && \
    npm cache clean --force

# --------------------------------------------------
# STAGE 2: Builder
# --------------------------------------------------
FROM node:20-alpine AS builder
WORKDIR /app

# Copy dependencies from deps stage
COPY --from=deps /app/node_modules ./node_modules
COPY frontend/package*.json ./

# Copy all source files
COPY frontend/ ./

# Set environment for build
ENV NEXT_TELEMETRY_DISABLED=1
ENV NODE_ENV=production

# Build Next.js application
RUN npm run build

# --------------------------------------------------
# STAGE 3: Production Runner (Standalone Mode)
# --------------------------------------------------
FROM node:20-alpine AS runner
WORKDIR /app

# Install runtime dependencies
RUN apk add --no-cache curl wget

# Create non-root user
RUN addgroup -g 1001 -S nodejs && \
    adduser -S nextjs -u 1001

# Set environment
ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1
ENV PORT=3000
ENV HOSTNAME="0.0.0.0"

# Copy necessary files from builder
COPY --from=builder /app/public ./public
COPY --from=builder /app/package*.json ./

# Copy standalone output
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

# Switch to non-root user
USER nextjs

# Expose port
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
    CMD wget --no-verbose --tries=1 --spider http://localhost:3000 || exit 1

# Start Next.js server
CMD ["node", "server.js"]

# --------------------------------------------------
# METADATA
# --------------------------------------------------
LABEL maintainer="math-platform-builders"
LABEL description="Math Platform Frontend (Next.js)"
LABEL version="1.0.0"