import React, { useEffect } from 'react';

interface SEOProps {
    title: string;
    description: string;
    keywords?: string[];
    canonicalUrl?: string;
    schema?: object; // JSON-LD schema
}

const SEO: React.FC<SEOProps> = ({ title, description, keywords, canonicalUrl, schema }) => {
    useEffect(() => {
        // Update Title
        document.title = title;

        // Helper to set meta tag
        const setMetaTag = (name: string, content: string) => {
            let element = document.querySelector(`meta[name="${name}"]`);
            if (!element) {
                element = document.createElement('meta');
                element.setAttribute('name', name);
                document.head.appendChild(element);
            }
            element.setAttribute('content', content);
        };

        // Update Meta Description
        setMetaTag('description', description);

        // Update Keywords
        if (keywords && keywords.length > 0) {
            setMetaTag('keywords', keywords.join(', '));
        }

        // Update Canonical
        if (canonicalUrl) {
            let link = document.querySelector('link[rel="canonical"]');
            if (!link) {
                link = document.createElement('link');
                link.setAttribute('rel', 'canonical');
                document.head.appendChild(link);
            }
            link.setAttribute('href', canonicalUrl);
        }

        // Inject Schema
        if (schema) {
            const scriptId = 'seo-schema-script';
            let script = document.getElementById(scriptId);
            if (!script) {
                script = document.createElement('script');
                script.id = scriptId;
                script.setAttribute('type', 'application/ld+json');
                document.head.appendChild(script);
            }
            script.textContent = JSON.stringify(schema);
        }

        // Cleanup function not strictly necessary for single page app navigation 
        // unless we want to remove specific tags on unmount, but usually we just overwrite them.

    }, [title, description, keywords, canonicalUrl, schema]);

    return null;
};

export default SEO;