import type { Metadata } from 'next';
import { getSEOConfig } from '../../../../lib/seo-config';
import { Article } from '@/lib/types';
import NewsArticleServerComponent from '@/app/components/news/NewsArticleServerComponent';
import { notFound } from 'next/navigation';

// 服务端获取文章数据
async function getArticleData(slug: string, locale: string) {
    try {
        // 检查是否为静态导出模式
        const isStaticMode = process.env.BUILD_MODE === 'static';
        
        if (isStaticMode) {
            // 静态模式下直接从文件系统读取
            const { getStaticArticleBySlug, getStaticArticles } = await import('../../../../lib/static-data');
            const article = getStaticArticleBySlug(slug, locale as 'zh-CN' | 'zh-TW' | 'en');
            
            if (!article) {
                return null;
            }
            
            // 获取相关文章
            const allArticles = getStaticArticles(locale as 'zh-CN' | 'zh-TW' | 'en');
            const relatedArticles = allArticles
                .filter(a => a.slug !== slug && a.metadata.category === article.metadata.category)
                .slice(0, 3);
            
            return { article, relatedArticles };
        } else {
            // 开发模式下使用 API
            const baseUrl = process.env.NEXT_PUBLIC_BASE_URL || 'http://localhost:3000';
            const response = await fetch(`${baseUrl}/api/articles/${slug}?locale=${locale}`, {
                // 使用 ISR 缓存策略，1小时后重新验证
                next: { revalidate: 3600 }
            });
            
            if (!response.ok) {
                if (response.status === 404) {
                    return null;
                }
                throw new Error('Failed to fetch article');
            }
            
            const data = await response.json();
            return data;
        }
    } catch (error) {
        console.error('Error fetching article:', error);
        return null;
    }
}

// 生成静态参数
export async function generateStaticParams() {
    const { getStaticArticles } = await import('../../../../lib/static-data');
    const locales = ['zh-CN', 'zh-TW', 'en'];
    const params = [];

    for (const locale of locales) {
        const articles = getStaticArticles(locale as 'zh-CN' | 'zh-TW' | 'en');
        for (const article of articles) {
            // 为每个locale生成对应的路由参数
            if (locale === 'zh-CN') {
                // 为简体中文生成两个路由：zh 和 zh-CN
                params.push({
                    locale: 'zh',
                    id: article.slug,
                });
                params.push({
                    locale: 'zh-CN',
                    id: article.slug,
                });
            } else {
                params.push({
                    locale: locale,
                    id: article.slug,
                });
            }
        }
    }

    return params;
}

// 生成动态元数据
export async function generateMetadata({
    params: { locale, id },
}: {
    params: { locale: string; id: string };
}): Promise<Metadata> {
    const mappedLocale = locale === 'zh' ? 'zh-CN' : locale === 'zh-CN' ? 'zh-CN' : locale === 'zh-TW' ? 'zh-TW' : 'en';
    const data = await getArticleData(id, mappedLocale);
    
    if (!data?.article) {
        return {
            title: '文章未找到 - AwsLinker',
            description: '您访问的文章不存在或已被移除。',
        };
    }
    
    const article: Article = data.article;
    const language = mappedLocale;
    
    return {
        title: `${article.metadata.title} - AwsLinker`,
        description: article.metadata.description,
        keywords: article.metadata.tags,
        openGraph: {
            title: article.metadata.title,
            description: article.metadata.description,
            type: 'article',
            images: article.metadata.image ? [{ url: article.metadata.image }] : undefined,
            publishedTime: article.metadata.date,
            authors: article.metadata.author ? [article.metadata.author] : undefined,
        },
        twitter: {
            card: 'summary_large_image',
            title: article.metadata.title,
            description: article.metadata.description,
            images: article.metadata.image ? [article.metadata.image] : undefined,
        },
        alternates: {
            canonical: locale === 'zh' ? `/news/${id}` : `/${locale}/news/${id}`,
            languages: {
                'zh-CN': `/news/${id}`,
                'zh-TW': `/zh-TW/news/${id}`,
                en: `/en/news/${id}`,
            },
        },
    };
}

// 服务器组件 - 预渲染数据
export default async function NewsArticlePage({
    params: { locale, id },
}: {
    params: { locale: string; id: string };
}) {
    const mappedLocale = locale === 'zh' ? 'zh-CN' : locale === 'zh-CN' ? 'zh-CN' : locale === 'zh-TW' ? 'zh-TW' : 'en';
    const data = await getArticleData(id, mappedLocale);
    
    if (!data?.article) {
        notFound();
    }
    
    return (
        <NewsArticleServerComponent
            article={data.article}
            relatedArticles={data.relatedArticles || []}
            locale={mappedLocale}
        />
    );
}