# HTTPS反向代理配置
upstream ai-chat-backend {
    server ai-chat-web:80;
    keepalive 32;
}

# HTTP重定向到HTTPS
server {
    listen 80;
    server_name your-domain.com www.your-domain.com;
    
    # Let's Encrypt验证
    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }
    
    # 重定向到HTTPS
    location / {
        return 301 https://$server_name$request_uri;
    }
}

# HTTPS主服务器
server {
    listen 443 ssl http2;
    server_name your-domain.com www.your-domain.com;
    
    # SSL配置
    ssl_certificate /etc/nginx/ssl/fullchain.pem;
    ssl_certificate_key /etc/nginx/ssl/privkey.pem;
    
    # SSL安全配置
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA384;
    ssl_prefer_server_ciphers off;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;
    
    # HSTS
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    
    # 其他安全头
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    
    # 日志配置
    access_log /var/log/nginx/access.log combined;
    error_log /var/log/nginx/error.log warn;
    
    # 代理配置
    location / {
        proxy_pass http://ai-chat-backend;
        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;
        
        # WebSocket支持
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        
        # 超时设置
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
        
        # 缓冲设置
        proxy_buffering on;
        proxy_buffer_size 4k;
        proxy_buffers 8 4k;
        
        # 连接复用
        proxy_set_header Connection "";
    }
    
    # 健康检查
    location /health {
        access_log off;
        proxy_pass http://ai-chat-backend/health;
    }
}