events { worker_connections 1024; }

http {
    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api:10m rate=30r/s;

    # Redirect HTTP → HTTPS
    server {
        listen 80;
        server_name samosachaat.art www.samosachaat.art;
        return 301 https://$host$request_uri;
    }

    server {
        listen 443 ssl;
        server_name samosachaat.art www.samosachaat.art;

        ssl_certificate     /etc/letsencrypt/live/samosachaat.art/fullchain.pem;
        ssl_certificate_key /etc/letsencrypt/live/samosachaat.art/privkey.pem;
        ssl_protocols       TLSv1.2 TLSv1.3;
        ssl_ciphers         HIGH:!aNULL:!MD5;

        client_max_body_size 10M;

        # Auth service
        location /api/auth/ {
            limit_req zone=api burst=10 nodelay;
            proxy_pass http://auth:8001/auth/;
            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;
        }

        # Chat API — SSE streaming needs special handling
        location /api/ {
            limit_req zone=api burst=20 nodelay;
            proxy_pass http://chat-api:8002/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_set_header X-Forwarded-Proto $scheme;

            # SSE support
            proxy_buffering off;
            proxy_cache off;
            proxy_read_timeout 300s;
            proxy_set_header Connection '';
            chunked_transfer_encoding off;
        }

        # Frontend (Next.js)
        location / {
            proxy_pass http://frontend:3000;
            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 support (Next.js HMR in dev, general)
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
        }

        # Grafana (optional, if monitoring is running)
        location /grafana/ {
            proxy_pass http://grafana:3000/;
            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;
        }
    }
}