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

events {
    worker_connections 1024;
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent"';

    access_log /var/log/nginx/access.log main;
    sendfile on;
    keepalive_timeout 65;
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml;

    upstream api_server {
        server server:3000;
    }

    # HTTP -> HTTPS redirect
    server {
        listen 80;
        server_name _;
        return 301 https://$host$request_uri;
    }

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

        ssl_certificate /etc/nginx/ssl/fullchain.pem;
        ssl_certificate_key /etc/nginx/ssl/privkey.pem;
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers HIGH:!aNULL:!MD5;

        # Mobile client (default)
        location / {
            root /usr/share/nginx/html/mobile;
            index index.html;
            try_files $uri $uri/ /index.html;
        }

        # Screen client
        location /screen {
            alias /usr/share/nginx/html/screen;
            index index.html;
            try_files $uri $uri/ /screen/index.html;
        }

        # API proxy
        location /api {
            proxy_pass http://api_server;
            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;
        }

        # WebSocket proxy
        location /socket.io {
            proxy_pass http://api_server;
            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_read_timeout 86400;
        }
    }
}