server {
    listen 80;
    server_name localhost;
    root /usr/share/nginx/html;
    index index.html;

    # Gzip Compression
    gzip on;
    gzip_vary on;
    gzip_min_length 10240;
    gzip_proxied expired no-cache no-store private auth;
    gzip_types text/plain text/css text/xml text/javascript application/x-javascript application/xml;
    gzip_disable "MSIE [1-6]\.";

    # 增加上传文件大小限制
    client_max_body_size 500M;

    location / {
        try_files $uri $uri/ /index.html;
    }

    # 后端API代理
    location /api/ {
        proxy_pass http://backend:8000;
        proxy_http_version 1.1;
        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;
        
        # 增加API超时时间
        proxy_read_timeout 300s;
        proxy_send_timeout 300s;
    }

    # MCP Streamable HTTP 代理
    # 对外以 /mcp 作为标准入口，避免 MCP Client 处理尾斜杠重定向。
    location = /mcp {
        proxy_pass http://backend:8000;
        proxy_http_version 1.1;
        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_set_header Connection "";

        proxy_buffering off;
        proxy_request_buffering off;
        proxy_read_timeout 3600s;
        proxy_send_timeout 3600s;
        chunked_transfer_encoding on;
    }

    location = /mcp/ {
        return 308 /mcp;
    }

    location = /docs {
        proxy_pass http://backend:8000/docs;
        proxy_http_version 1.1;
        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;
    }

    location = /redoc {
        proxy_pass http://backend:8000/redoc;
        proxy_http_version 1.1;
        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;
    }

    location = /openapi.json {
        proxy_pass http://backend:8000/openapi.json;
        proxy_http_version 1.1;
        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;
    }

    location = /docs/oauth2-redirect {
        proxy_pass http://backend:8000/docs/oauth2-redirect;
        proxy_http_version 1.1;
        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;
    }

    # 上传文件代理 (使用 ^~ 提高优先级，避免被静态文件正则匹配拦截)
    location ^~ /uploads/ {
        proxy_pass http://backend:8000;
        proxy_http_version 1.1;
        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;
        
        # 静态资源缓存配置
        expires 30d;
        add_header Cache-Control "public, no-transform";
    }

    # Cache static assets
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg)$ {
        expires 30d;
        add_header Cache-Control "public, no-transform";
    }

    error_page 500 502 503 504 /50x.html;
    location = /50x.html {
        root /usr/share/nginx/html;
    }
}