user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log warn;
pid /var/run/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;

    # 基本设置
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    server_tokens off;

    # Gzip压缩
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/javascript
        application/xml+rss
        application/json;

    # 文件上传限制
    client_max_body_size 64G;
    client_body_timeout 60s;
    client_header_timeout 60s;

    # 缓存设置
    open_file_cache max=10000 inactive=5m;
    open_file_cache_valid 2m;
    open_file_cache_min_uses 1;
    open_file_cache_errors on;

    # 上游服务器
    upstream chuan_backend {
        server chuan:8080;
        keepalive 32;
    }

    # HTTP服务器（重定向到HTTPS）
    server {
        listen 80;
        server_name _;
        return 301 https://$server_name$request_uri;
    }

    # HTTPS服务器
    server {
        listen 443 ssl http2;
        server_name _;

        # SSL配置
        ssl_certificate /etc/nginx/ssl/cert.pem;
        ssl_certificate_key /etc/nginx/ssl/key.pem;
        ssl_session_timeout 1d;
        ssl_session_cache shared:SSL:50m;
        ssl_session_tickets off;

        # 现代SSL配置
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
        ssl_prefer_server_ciphers off;

        # 安全头
        add_header Strict-Transport-Security "max-age=63072000" always;
        add_header X-Frame-Options DENY;
        add_header X-Content-Type-Options nosniff;
        add_header X-XSS-Protection "1; mode=block";

        # 静态文件缓存
        location ~* \.(css|js|jpg|jpeg|png|gif|ico|svg|woff|woff2|ttf|eot)$ {
            expires 1y;
            add_header Cache-Control "public, immutable";
            add_header Vary Accept-Encoding;
            access_log off;
        }

        # 上传文件服务
        location /uploads/ {
            alias /var/www/uploads/;
            expires 24h;
            add_header Cache-Control "public";
            
            # 安全设置
            add_header X-Content-Type-Options nosniff;
            add_header Content-Security-Policy "default-src 'none'; style-src 'unsafe-inline';";
            
            # 限制访问
            valid_referers none blocked server_names;
            if ($invalid_referer) {
                return 403;
            }
        }

        # WebSocket代理
        location /ws/ {
            proxy_pass http://chuan_backend;
            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_read_timeout 86400;
        }

        # API代理
        location /api/ {
            proxy_pass http://chuan_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;
            
            # 超时设置
            proxy_connect_timeout 60s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;
        }

        # 主应用代理
        location / {
            proxy_pass http://chuan_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;
            
            # 缓存设置
            proxy_buffering on;
            proxy_buffer_size 4k;
            proxy_buffers 8 4k;
            
            # 超时设置
            proxy_connect_timeout 30s;
            proxy_send_timeout 30s;
            proxy_read_timeout 30s;
        }

        # 健康检查
        location /health {
            access_log off;
            return 200 "healthy\n";
            add_header Content-Type text/plain;
        }

        # 错误页面
        error_page 404 /404.html;
        error_page 500 502 503 504 /50x.html;
        
        location = /404.html {
            root /usr/share/nginx/html;
        }
        
        location = /50x.html {
            root /usr/share/nginx/html;
        }
    }
}