server {
    listen 80;
    server_name localhost;

    root /usr/share/nginx/html;
    index index.html;

    # 增加上传文件大小限制（支持大文件上传）
    client_max_body_size 100M;

    # 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/json application/xml+rss;

    # API 反向代理（代理到后端服务）
    # 必须在静态资源规则之前，确保 API 请求优先匹配
    location /api/ {
        proxy_pass http://backend:8000/api/;
        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;

        # 增加上传文件大小限制
        client_max_body_size 100M;

        # WebSocket 支持
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";

        # 禁用缓存（API 请求不应该被缓存）
        proxy_buffering off;
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }

    # PDF.js worker 文件 - 必须返回正确的 MIME type
    location /pdf-worker/ {
        types {
            application/javascript mjs;
        }
        add_header Content-Type "application/javascript" always;
        add_header Cache-Control "public, max-age=31536000, immutable";
    }

    # 前端路由支持
    location / {
        try_files $uri $uri/ /index.html;
        add_header Cache-Control "no-cache, no-store, must-revalidate";
    }

    # 前端静态资源缓存（仅针对前端打包后的静态文件）
    location ~* ^/assets/.*\.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # 禁止访问隐藏文件
    location ~ /\. {
        deny all;
    }
}