'use client';

import { useEffect } from 'react';

interface TDKProps {
    title: string;
    description: string;
    keywords: string;
    lang: string;
}

export default function TDK({ title, description, keywords, lang }: TDKProps) {
    useEffect(() => {
        // Update document title
        document.title = title;

        // Update meta description
        let metaDesc = document.querySelector('meta[name="description"]');
        if (!metaDesc) {
            metaDesc = document.createElement('meta');
            metaDesc.setAttribute('name', 'description');
            document.head.appendChild(metaDesc);
        }
        metaDesc.setAttribute('content', description);

        // Update meta keywords
        let metaKeywords = document.querySelector('meta[name="keywords"]');
        if (!metaKeywords) {
            metaKeywords = document.createElement('meta');
            metaKeywords.setAttribute('name', 'keywords');
            document.head.appendChild(metaKeywords);
        }
        metaKeywords.setAttribute('content', keywords);

        // Update language meta tag
        let metaLang = document.querySelector('meta[http-equiv="Content-Language"]');
        if (!metaLang) {
            metaLang = document.createElement('meta');
            metaLang.setAttribute('http-equiv', 'Content-Language');
            document.head.appendChild(metaLang);
        }
        metaLang.setAttribute('content', lang);

        // Add hreflang tags for language alternatives
        const supportedLangs = ['en', 'zh-CN', 'zh-TW', 'ko', 'ja'];

        // Remove existing hreflang tags
        document.querySelectorAll('link[rel="alternate"][hreflang]').forEach((el) => el.remove());

        // Add new hreflang tags
        const baseUrl = window.location.origin;
        supportedLangs.forEach((supportedLang) => {
            const hreflangLink = document.createElement('link');
            hreflangLink.setAttribute('rel', 'alternate');
            hreflangLink.setAttribute('hreflang', supportedLang);
            hreflangLink.setAttribute('href', `${baseUrl}/${supportedLang}`);
            document.head.appendChild(hreflangLink);
        });

        // Add x-default hreflang
        const xDefaultLink = document.createElement('link');
        xDefaultLink.setAttribute('rel', 'alternate');
        xDefaultLink.setAttribute('hreflang', 'x-default');
        xDefaultLink.setAttribute('href', `${baseUrl}/en`);
        document.head.appendChild(xDefaultLink);

        // Update canonical URL
        let canonicalLink = document.querySelector('link[rel="canonical"]');
        if (!canonicalLink) {
            canonicalLink = document.createElement('link');
            canonicalLink.setAttribute('rel', 'canonical');
            document.head.appendChild(canonicalLink);
        }
        canonicalLink.setAttribute('href', window.location.href.split('?')[0]);

        // Add Open Graph meta tags
        let ogTitle = document.querySelector('meta[property="og:title"]');
        if (!ogTitle) {
            ogTitle = document.createElement('meta');
            ogTitle.setAttribute('property', 'og:title');
            document.head.appendChild(ogTitle);
        }
        ogTitle.setAttribute('content', title);

        let ogDesc = document.querySelector('meta[property="og:description"]');
        if (!ogDesc) {
            ogDesc = document.createElement('meta');
            ogDesc.setAttribute('property', 'og:description');
            document.head.appendChild(ogDesc);
        }
        ogDesc.setAttribute('content', description);

        let ogUrl = document.querySelector('meta[property="og:url"]');
        if (!ogUrl) {
            ogUrl = document.createElement('meta');
            ogUrl.setAttribute('property', 'og:url');
            document.head.appendChild(ogUrl);
        }
        ogUrl.setAttribute('content', window.location.href);

        let ogType = document.querySelector('meta[property="og:type"]');
        if (!ogType) {
            ogType = document.createElement('meta');
            ogType.setAttribute('property', 'og:type');
            document.head.appendChild(ogType);
        }
        ogType.setAttribute('content', 'website');

        // Add Twitter Card meta tags
        let twitterCard = document.querySelector('meta[name="twitter:card"]');
        if (!twitterCard) {
            twitterCard = document.createElement('meta');
            twitterCard.setAttribute('name', 'twitter:card');
            document.head.appendChild(twitterCard);
        }
        twitterCard.setAttribute('content', 'summary_large_image');

        let twitterTitle = document.querySelector('meta[name="twitter:title"]');
        if (!twitterTitle) {
            twitterTitle = document.createElement('meta');
            twitterTitle.setAttribute('name', 'twitter:title');
            document.head.appendChild(twitterTitle);
        }
        twitterTitle.setAttribute('content', title);

        let twitterDesc = document.querySelector('meta[name="twitter:description"]');
        if (!twitterDesc) {
            twitterDesc = document.createElement('meta');
            twitterDesc.setAttribute('name', 'twitter:description');
            document.head.appendChild(twitterDesc);
        }
        twitterDesc.setAttribute('content', description);
    }, [title, description, keywords, lang]);

    // This component doesn't render anything visible
    return null;
}