# 优化版多阶段构建Dockerfile
# 这个版本针对生产环境进行了优化，镜像更小，安全性更高

# ================================
# 阶段1: 前端构建
# ================================
FROM node:18-alpine as frontend-builder

# 设置工作目录
WORKDIR /app

# 只复制package文件，利用Docker缓存
COPY client/package*.json ./

# 安装依赖
RUN npm ci --only=production && \
    npm cache clean --force

# 复制源代码
COPY client/ ./

# 构建前端
RUN npm run build

# ================================
# 阶段2: 后端构建
# ================================
FROM node:18-alpine as backend-builder

WORKDIR /app

# 复制package文件
COPY server/package*.json ./

# 安装依赖
RUN npm ci --only=production && \
    npm cache clean --force

# 复制源代码
COPY server/ ./

# ================================
# 阶段3: 最终生产镜像
# ================================
FROM node:18-alpine

# 安装运行时依赖
RUN apk add --no-cache \
    nginx \
    supervisor \
    wget \
    curl \
    dumb-init \
    && rm -rf /var/cache/apk/*

# 创建应用用户
RUN addgroup -g 1001 -S appuser && \
    adduser -S appuser -u 1001 -G appuser

# 创建必要的目录
RUN mkdir -p /app /var/log/nginx /var/log/supervisor /run/nginx && \
    chown -R appuser:appuser /app /var/log/nginx /var/log/supervisor /run/nginx

# 设置工作目录
WORKDIR /app

# 复制后端文件
COPY --from=backend-builder --chown=appuser:appuser /app ./

# 复制前端构建文件
COPY --from=frontend-builder --chown=appuser:appuser /app/dist ./public

# 创建nginx配置
COPY --chown=appuser:appuser <<EOF /etc/nginx/nginx.conf
user appuser;
worker_processes auto;
pid /run/nginx/nginx.pid;

events {
    worker_connections 1024;
    use epoll;
    multi_accept on;
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;
    
    # 日志格式
    log_format main '\$remote_addr - \$remote_user [\$time_local] "\$request" '
                    '\$status \$body_bytes_sent "\$http_referer" '
                    '"\$http_user_agent" "\$http_x_forwarded_for"';
    
    access_log /var/log/nginx/access.log main;
    error_log /var/log/nginx/error.log warn;
    
    # 性能优化
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    
    # Gzip压缩
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_comp_level 6;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
    
    server {
        listen 80;
        server_name localhost;
        root /app/public;
        index index.html;
        
        # 前端路由
        location / {
            try_files \$uri \$uri/ /index.html;
        }
        
        # API代理
        location /api/ {
            proxy_pass http://127.0.0.1:5000;
            proxy_http_version 1.1;
            proxy_set_header Upgrade \$http_upgrade;
            proxy_set_header Connection 'upgrade';
            proxy_set_header Host \$host;
            proxy_set_header X-Real-IP \$remote_addr;
            proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto \$scheme;
            proxy_cache_bypass \$http_upgrade;
        }
        
        # Socket.IO代理
        location /socket.io/ {
            proxy_pass http://127.0.0.1:5000;
            proxy_http_version 1.1;
            proxy_set_header Upgrade \$http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_set_header Host \$host;
            proxy_set_header X-Real-IP \$remote_addr;
            proxy_set_header X-Forwarded-For \$proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto \$scheme;
        }
        
        # 静态资源缓存
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)\$ {
            expires 1y;
            add_header Cache-Control "public, immutable";
        }
    }
}
EOF

# 创建supervisor配置
COPY --chown=appuser:appuser <<EOF /etc/supervisor/conf.d/supervisord.conf
[supervisord]
nodaemon=true
user=appuser
logfile=/var/log/supervisor/supervisord.log
pidfile=/run/supervisord.pid
childlogdir=/var/log/supervisor

[program:nginx]
command=nginx -g "daemon off;"
autostart=true
autorestart=true
stderr_logfile=/var/log/supervisor/nginx_error.log
stdout_logfile=/var/log/supervisor/nginx_access.log
user=appuser

[program:node]
command=node index.js
directory=/app
autostart=true
autorestart=true
stderr_logfile=/var/log/supervisor/node_error.log
stdout_logfile=/var/log/supervisor/node_access.log
user=appuser
environment=NODE_ENV=production,PORT=5000
EOF

# 设置权限
RUN chown -R appuser:appuser /etc/nginx /etc/supervisor

# 切换到应用用户
USER appuser

# 暴露端口
EXPOSE 80

# 环境变量
ENV NODE_ENV=production
ENV PORT=5000

# 健康检查
HEALTHCHECK --interval=30s --timeout=10s --start-period=60s --retries=3 \
    CMD wget --no-verbose --tries=1 --spider http://localhost:80/api/health || exit 1

# 使用dumb-init作为PID 1
ENTRYPOINT ["/usr/bin/dumb-init", "--"]

# 启动supervisor
CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]