user  root;
worker_processes  auto;

error_log  /var/log/nginx/error.log notice;
pid        /var/run/nginx.pid;

events {
    worker_connections  1024;
}

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

    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;
    sendfile        on;
    keepalive_timeout  65;

    server {
        listen 80;
        server_name localhost;

        # Frontend SPA static files
        root /usr/share/nginx/html;
        index index.html;

        # Gzip compression
        gzip on;
        gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

        # 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;

        # API proxy to backend
        location /api/ {
            proxy_pass http://publish-backend:8080;
            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_connect_timeout 60s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;
        }

        # Cover images and uploaded files - serve directly from volume mount
        location /uploads/ {
            alias /app/uploads/;
            expires 7d;
            add_header Cache-Control "public";
        }

        # Static assets caching
        location /assets/ {
            expires 1y;
            add_header Cache-Control "public, immutable";
        }

        # SPA fallback - all non-API requests return index.html
        location / {
            try_files $uri $uri/ /index.html;
        }

        # Error pages
        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
            root /usr/share/nginx/html;
        }
    }
}