# Production Dockerfile for Frontend Web App
# Optimized for smaller size, security, and performance

# Build stage
FROM node:20-alpine AS builder

WORKDIR /app

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

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

# Install dependencies (this layer will be cached if package*.json don't change)
RUN npm ci --only=production=false && \
    npm cache clean --force

# Copy source code
COPY . .

# Build arguments for environment variables
ARG VITE_API_URL
ARG VITE_WS_URL
ARG VITE_STREAM_URL
ARG VITE_APP_ENV=production

# Set build-time environment variables
ENV VITE_API_URL=${VITE_API_URL}
ENV VITE_WS_URL=${VITE_WS_URL}
ENV VITE_STREAM_URL=${VITE_STREAM_URL}
ENV VITE_APP_ENV=${VITE_APP_ENV}
ENV NODE_ENV=production

# Build the application with optimizations
RUN npm run build && \
    # Verify build output exists
    test -f dist/index.html || { echo "ERROR: dist/index.html not found after build!"; exit 1; } && \
    # Remove source maps in production (optional, for smaller size)
    find dist -name "*.map" -delete && \
    # Show build summary
    echo "✅ Build successful - dist/ contains $(find dist -type f | wc -l) files" && \
    du -sh dist/

# Production stage - nginx alpine
FROM nginx:1.27-alpine

# Install minimal dependencies for healthcheck
RUN apk add --no-cache wget && \
    rm -rf /var/cache/apk/*

# Remove default nginx config
RUN rm -rf /etc/nginx/conf.d/default.conf

# Copy custom nginx configuration optimized for production
COPY nginx.production.conf /etc/nginx/conf.d/default.conf

# Copy built assets from builder
COPY --from=builder /app/dist /usr/share/nginx/html

# Create health check endpoint
RUN echo '#!/bin/sh' > /usr/share/nginx/html/health && \
    echo 'exit 0' >> /usr/share/nginx/html/health && \
    chmod +x /usr/share/nginx/html/health

# Set proper permissions
RUN chown -R nginx:nginx /usr/share/nginx/html && \
    chmod -R 755 /usr/share/nginx/html

# Nginx alpine image already runs as non-root user (nginx)

# Expose port
EXPOSE 80

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

# Run nginx
CMD ["nginx", "-g", "daemon off;"]