# ===============================================
# Stage 1: Dependencies Installation
# ===============================================
FROM node:20-alpine AS dependencies

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

# Set working directory
WORKDIR /app

# Copy package files
COPY package*.json ./

# Install all dependencies (including dev for build)
RUN npm ci --legacy-peer-deps

# ===============================================
# Stage 2: Build Application
# ===============================================
FROM node:20-alpine AS builder

WORKDIR /app

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

# Copy source code
COPY . .

# Set build-time environment variables
ARG NEXT_PUBLIC_API_URL
ARG NEXT_PUBLIC_APP_URL
ARG NEXT_PUBLIC_SENTRY_DSN
ARG NEXT_PUBLIC_SENTRY_ENVIRONMENT
ARG NEXT_PUBLIC_GA_MEASUREMENT_ID

ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL \
    NEXT_PUBLIC_APP_URL=$NEXT_PUBLIC_APP_URL \
    NEXT_PUBLIC_SENTRY_DSN=$NEXT_PUBLIC_SENTRY_DSN \
    NEXT_PUBLIC_SENTRY_ENVIRONMENT=$NEXT_PUBLIC_SENTRY_ENVIRONMENT \
    NEXT_PUBLIC_GA_MEASUREMENT_ID=$NEXT_PUBLIC_GA_MEASUREMENT_ID \
    NEXT_TELEMETRY_DISABLED=1

# Build the Next.js application
RUN npm run build

# ===============================================
# Stage 3: Production Image
# ===============================================
FROM node:20-alpine AS production

# Install dumb-init for proper signal handling
RUN apk add --no-cache dumb-init curl

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

# Set working directory
WORKDIR /app

# Copy built application from builder
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

# Switch to non-root user
USER nextjs

# Expose port
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
  CMD curl -f http://localhost:3000/api/health || exit 1

# Set environment variables
ENV NODE_ENV=production \
    PORT=3000 \
    HOSTNAME="0.0.0.0"

# Use dumb-init to handle signals properly
ENTRYPOINT ["dumb-init", "--"]

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