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

    client_max_body_size 105m;

    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml image/svg+xml;
    gzip_min_length 1024;

    location = /index.html {
        add_header Cache-Control "no-store";
    }

    location = /simulator {
        return 301 /simulator/;
    }

    location ^~ /simulator/ {
        proxy_pass http://emp-ws:3000/simulator/;
        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_read_timeout 300s;
    }

    location ^~ /api/simulator/ {
        proxy_pass http://emp-ws:3000/api/simulator/;
        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_read_timeout 300s;
    }

    location /api/ {
        proxy_pass http://emp-gateway:9000/api/;
        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_read_timeout 300s;
    }

    location /socket.io/ {
        proxy_pass http://emp-ws:3000/socket.io/;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_read_timeout 300s;
    }

    # Grafana 监控：经本入口以 /grafana/ 子路径反代到监控栈(emp-mon 项目)的 grafana 容器。
    # 用 resolver + 变量 proxy_pass，grafana 未启动时仅此路径 502，不影响 nginx 启动与其他功能。
    # 需 grafana 容器(emp-mon-grafana)与本容器同网(emp-mon compose 已用 external 网络接入)。
    location ^~ /grafana/ {
        resolver 127.0.0.11 valid=10s ipv6=off;
        set $grafana_upstream emp-mon-grafana:3000;
        proxy_pass http://$grafana_upstream;
        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_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_read_timeout 300s;
    }

    location / {
        add_header Cache-Control "no-store";
        try_files $uri $uri/ /index.html;
    }

    location ~* \.(js|css)$ {
        expires -1;
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        try_files $uri =404;
    }

    location ~* \.(png|jpg|jpeg|gif|ico|svg|woff2?|ttf|glb)$ {
        expires 30d;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }
}