events {
    worker_connections 1024;
}

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

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    gzip on;

    # Cache settings for HLS
    proxy_cache_path /var/cache/nginx levels=1:2 keys_zone=hls_cache:10m max_size=1g inactive=60m use_temp_path=off;

    server {
        listen 8880;
        server_name _;

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

        # Health check
        location /health {
            access_log off;
            return 200 "OK\n";
            add_header Content-Type text/plain;
        }

        # Main web interface
        location / {
            try_files $uri $uri/ /index.html;
            add_header Cache-Control "no-cache, no-store, must-revalidate";
        }

        # HLS streams proxy
        location /hls/ {
            proxy_pass http://[::1]:8888/;
            proxy_http_version 1.1;
            
            # CORS headers
            add_header Access-Control-Allow-Origin *;
            add_header Access-Control-Allow-Methods "GET, OPTIONS";
            add_header Access-Control-Allow-Headers "Range";
            
            # Cache HLS segments
            proxy_cache hls_cache;
            proxy_cache_valid 200 1m;
            proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
            
            proxy_buffering off;
            proxy_request_buffering off;
        }

        # WebRTC signaling (WHEP)
        location /webrtc/ {
            proxy_pass http://[::1]:8889/;
            proxy_http_version 1.1;
            
            # CORS headers for WebRTC
            add_header Access-Control-Allow-Origin * always;
            add_header Access-Control-Allow-Methods "GET, POST, OPTIONS, PATCH, DELETE" always;
            add_header Access-Control-Allow-Headers "Authorization, Content-Type, If-Match" always;
            add_header Access-Control-Expose-Headers "Link" always;
            
            # Handle OPTIONS preflight
            if ($request_method = OPTIONS) {
                return 204;
            }
            
            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_buffering off;
            proxy_request_buffering off;
            proxy_read_timeout 86400;
            proxy_send_timeout 86400;
        }

        # MediaMTX API
        location /api/mediamtx/ {
            proxy_pass http://[::1]:9997/;
            allow 127.0.0.1;
            allow 172.16.0.0/12;
            deny all;
        }

        # Recordings
        location /recordings/ {
            alias /recordings/;
            autoindex on;
            autoindex_exact_size off;
            autoindex_localtime on;
            add_header Accept-Ranges bytes;
            add_header Content-Disposition "inline";
        }

        # API endpoint for recordings list
        location /api/recordings {
            default_type application/json;
            return 200 '{"recordings": []}';
        }

        # Metrics
        location /metrics {
            proxy_pass http://localhost:9998/metrics;
            allow 127.0.0.1;
            allow 172.16.0.0/12;
            deny all;
        }
    }
}