limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
limit_req_zone $binary_remote_addr zone=auth:10m rate=5r/m;
limit_req_zone $binary_remote_addr zone=uploads:10m rate=2r/s;

server {
    listen 80;
    server_name localhost;
    server_tokens off;

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

    add_header X-Content-Type-Options nosniff always;
    add_header X-Frame-Options DENY always;
    add_header X-XSS-Protection "0" always;
    add_header Referrer-Policy strict-origin-when-cross-origin always;
    add_header Permissions-Policy "camera=(), microphone=(), geolocation=()" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' blob: data:; font-src 'self' https://fonts.googleapis.com https://fonts.gstatic.com; connect-src 'self'" always;

    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml;
    gzip_min_length 256;

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

    location /api/auth/ {
        limit_req zone=auth burst=5 nodelay;
        proxy_pass http://backend:8000;
        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_connect_timeout 5s;
        proxy_read_timeout 30s;
        proxy_send_timeout 30s;
    }

    location /api/ {
        limit_req zone=api burst=20 nodelay;
        proxy_pass http://backend:8000;
        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;
        client_max_body_size 12M;
        proxy_connect_timeout 5s;
        proxy_read_timeout 30s;
        proxy_send_timeout 30s;
    }

    location /uploads/ {
        limit_req zone=uploads burst=10 nodelay;
        proxy_pass http://backend:8000;
        proxy_set_header Host $host;
        proxy_connect_timeout 5s;
        proxy_read_timeout 30s;
    }
}