# =============================================================================
# GoHorse Jobs Frontend - Ultra-Optimized Dockerfile with pnpm
# Target: < 150MB final image, minimal disk usage during build
# =============================================================================
# syntax=docker/dockerfile:1

# -----------------------------------------------------------------------------
# Stage 1: Base with pnpm
# -----------------------------------------------------------------------------
FROM mirror.gcr.io/library/node:20-alpine AS base

# Enable corepack and activate pnpm (latest)
RUN corepack enable && corepack prepare pnpm@latest --activate

# Set pnpm store for caching
ENV PNPM_HOME="/pnpm"
ENV PATH="$PNPM_HOME:$PATH"

# -----------------------------------------------------------------------------
# Stage 2: Dependencies
# -----------------------------------------------------------------------------
FROM base AS deps

WORKDIR /app

# Copy package files (pnpm will use package-lock.json if no pnpm-lock.yaml)
COPY package.json package-lock.json* pnpm-lock.yaml* ./

# Install deps with cache mount - dramatically reduces disk usage on rebuilds
RUN --mount=type=cache,id=pnpm,target=/pnpm/store \
    pnpm import 2>/dev/null || true && \
    pnpm install --frozen-lockfile || pnpm install

# -----------------------------------------------------------------------------
# Stage 3: Builder (memory-optimized)
# -----------------------------------------------------------------------------
FROM base AS builder

# Reduce memory usage during build
ENV NODE_OPTIONS="--max-old-space-size=512"

WORKDIR /app

# Copy deps from previous stage
COPY --from=deps /app/node_modules ./node_modules

# Copy source files (respects .dockerignore)
COPY package.json next.config.* tsconfig.json ./
COPY public ./public
COPY src ./src

# Build arguments
ARG NEXT_PUBLIC_API_URL=http://localhost:8080
ARG NEXT_PUBLIC_BACKOFFICE_URL=http://localhost:3001
ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL
ENV NEXT_PUBLIC_BACKOFFICE_URL=$NEXT_PUBLIC_BACKOFFICE_URL
ENV NEXT_TELEMETRY_DISABLED=1

# Build and cleanup in same layer
RUN pnpm build && \
    rm -rf node_modules/.cache .next/cache

# -----------------------------------------------------------------------------
# Stage 4: Production Runner (minimal)
# -----------------------------------------------------------------------------
FROM mirror.gcr.io/library/node:20-alpine AS runner

WORKDIR /app

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

ENV NODE_ENV=production \
    NEXT_TELEMETRY_DISABLED=1 \
    PORT=3000

# Copy ONLY standalone output (smallest possible)
COPY --from=builder --chown=nextjs:nodejs /app/public ./public
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

USER nextjs

EXPOSE 3000

CMD ["node", "server.js"]