events {
    worker_connections 1024;
}

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

    upstream backend_api {
        server backend:8000;
    }

    server {
        listen 80;

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

        # SPA fallback - try file first, then fallback to index.html
        location / {
            try_files $uri $uri/ /index.html;
        }

        location /api/ {
            proxy_pass http://backend_api/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_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_read_timeout 86400s;
        }

        location /wecom/ {
            proxy_pass http://backend_api/wecom/;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
        }

        # Cache static assets
        location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
            expires 1y;
            add_header Cache-Control "public, immutable";
        }
    }
}