server {
    listen 80;
    server_name _;

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

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;
    add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' http://www.gstatic.com https://www.gstatic.com; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: http: https:; media-src 'self' blob: http: https:; connect-src 'self' http: https: ws: wss:; font-src 'self' data:;" always;

    # Hide nginx version
    server_tokens off;

    # SSE activity stream (must be before general /api/ to match first)
    location /api/public/activity/stream {
        proxy_pass http://api:3001;
        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;
        proxy_set_header Connection '';
        proxy_buffering off;
        proxy_cache off;
        proxy_read_timeout 86400s;
        chunked_transfer_encoding off;
    }

    # SSE reactions stream (regex to match /api/reactions/ID/stream)
    location ~ ^/api/reactions/\d+/stream$ {
        proxy_pass http://api:3001;
        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;
        proxy_set_header Connection '';
        proxy_buffering off;
        proxy_cache off;
        proxy_read_timeout 86400s;
        chunked_transfer_encoding off;
    }

    # WebSocket signaling for watch party (regex to match /api/watch-party/ID/signal)
    location ~ ^/api/watch-party/\d+/signal$ {
        proxy_pass http://api:3001;
        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;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_read_timeout 86400s;
        proxy_send_timeout 86400s;
        proxy_buffering off;
    }

    # SSE watch party stream (regex to match /api/watch-party/ID/stream)
    location ~ ^/api/watch-party/\d+/stream$ {
        proxy_pass http://api:3001;
        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;
        proxy_set_header Connection '';
        proxy_buffering off;
        proxy_cache off;
        proxy_read_timeout 86400s;
        chunked_transfer_encoding off;
    }

    # API proxy (preserve /api/ prefix)
    location /api/ {
        proxy_pass http://api:3001;
        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;
        client_max_body_size 50m;
    }

    # Proxy thumbnail requests to nginx video server (^~ takes precedence over regex)
    location ^~ /thumbnails/ {
        proxy_pass http://nginx:80/thumbnails/;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
        expires 7d;
        add_header Cache-Control "public, max-age=604800";
    }

    # Proxy video requests to nginx video server (^~ takes precedence over regex)
    location ^~ /videos/ {
        proxy_pass http://nginx:80/videos/;
        proxy_http_version 1.1;
        proxy_set_header Host $host;
    }

    # SPA routing - serve index.html for all non-file routes
    location / {
        try_files $uri $uri/ /index.html;
    }

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