# Multi-stage build for optimized production image
FROM node:20 AS base

# Install dependencies only when needed
FROM base AS deps
RUN apt-get update && apt-get install -y --no-install-recommends curl && rm -rf /var/lib/apt/lists/*
WORKDIR /app

# Copy package files first for better caching
COPY package.json package-lock.json* ./
RUN npm ci --only=production && npm cache clean --force

# Rebuild the source code only when needed
FROM base AS builder
WORKDIR /app

# Copy package files first for better caching
COPY package.json package-lock.json* ./

# Install all dependencies (including dev dependencies for build)
# Use npm ci with cache mount for faster builds
RUN --mount=type=cache,target=/root/.npm \
    npm ci

# Copy Prisma schema first (for better caching)
COPY prisma ./prisma

# Generate Prisma client (cached if schema unchanged)
RUN npx prisma generate

# Copy source code (this invalidates cache when code changes)
COPY . .

# Build the application
ENV NEXT_TELEMETRY_DISABLED=1
ENV NODE_ENV=production
RUN npm run build

# Verify standalone output was created and show structure for debugging
RUN if [ ! -d .next/standalone ]; then \
      echo "ERROR: .next/standalone directory not found!"; \
      echo "Contents of .next directory:"; \
      ls -la .next/ || true; \
      echo "Checking if standalone exists in different location:"; \
      find .next -name "standalone" -type d || true; \
      exit 1; \
    fi && \
    echo "✅ Standalone output found" && \
    ls -la .next/standalone/ && \
    echo "Standalone structure:" && \
    find .next/standalone -type f -name "server.js" || echo "server.js not found in standalone"

# Production image, copy all the files and run next
FROM base AS runner
WORKDIR /app

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1

# Install curl for health checks
RUN apt-get update && apt-get install -y --no-install-recommends curl && rm -rf /var/lib/apt/lists/*

# Create a non-root user
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

# Copy the built application
COPY --from=builder /app/public ./public

# Set the correct permission for prerender cache
RUN mkdir .next
RUN chown nextjs:nodejs .next

# Automatically leverage output traces to reduce image size
# https://nextjs.org/docs/advanced-features/output-file-tracing
# Copy standalone output (contains server.js and all dependencies)
# The standalone output structure is: .next/standalone/ (not .next/standalone/app/)
# Next.js creates: .next/standalone/server.js, .next/standalone/.next/, .next/standalone/node_modules/
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

# Copy Prisma files
COPY --from=builder /app/prisma ./prisma
COPY --from=builder /app/node_modules/.prisma ./node_modules/.prisma
COPY --from=builder /app/node_modules/prisma ./node_modules/prisma
COPY --from=builder /app/node_modules/@prisma ./node_modules/@prisma

# Create scripts directory and copy start script AFTER standalone to ensure it's not overwritten
RUN mkdir -p scripts && chown nextjs:nodejs scripts
COPY --from=builder --chown=nextjs:nodejs /app/scripts/start-with-migrate.js ./scripts/start-with-migrate.js

# Note: Environment variables should be passed via docker-compose or runtime environment
# DO NOT copy .env files into the image for security reasons

USER nextjs

EXPOSE 3000

ENV PORT=3000
ENV HOSTNAME="0.0.0.0"

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD curl -f http://localhost:3000/api/health || exit 1

CMD ["node", "scripts/start-with-migrate.js"]