import fs from 'fs';
import path from 'path';
import matter from 'gray-matter';

const newsDirectory = path.join(process.cwd(), 'content/news');

export interface NewsItem {
    id: string;
    title: string;
    title_zh_CN: string;
    title_zh_TW: string;
    summary: string;
    summary_zh_CN: string;
    summary_zh_TW: string;
    category: string;
    date: string;
    readTime: string;
    tags: string[];
    tags_zh_CN: string[];
    tags_zh_TW: string[];
    author: string;
    author_zh_CN: string;
    author_zh_TW: string;
    image: string;
    content: string;
}

export function getAllNews(): NewsItem[] {
    const fileNames = fs.readdirSync(newsDirectory);
    const allNewsData = fileNames
        .filter((fileName) => fileName.endsWith('.md'))
        .map((fileName) => {
            const id = fileName.replace(/\.md$/, '');
            const fullPath = path.join(newsDirectory, fileName);
            const fileContents = fs.readFileSync(fullPath, 'utf8');
            const matterResult = matter(fileContents);

            return {
                id,
                content: matterResult.content,
                ...matterResult.data,
            } as NewsItem;
        });

    return allNewsData.sort((a, b) => {
        if (a.date < b.date) {
            return 1;
        } else {
            return -1;
        }
    });
}

export function getNewsById(id: string): NewsItem | undefined {
    const allNews = getAllNews();
    return allNews.find((news) => news.id === id);
}

// 简单的 markdown 解析器，用于提取特定语言的内容
export function parseMarkdownContent(content: string, language: string): string {
    const sections = content.split(/^## (en|zh-CN|zh-TW)$/m);

    // 如果没有语言分节，返回原内容
    if (sections.length === 1) {
        return content;
    }

    // 查找对应语言的内容
    for (let i = 1; i < sections.length; i += 2) {
        const sectionLang = sections[i];
        const sectionContent = sections[i + 1];

        if (sectionLang === language) {
            return sectionContent.trim();
        }
    }

    // 如果没找到对应语言，返回英文内容或第一个内容
    for (let i = 1; i < sections.length; i += 2) {
        const sectionLang = sections[i];
        const sectionContent = sections[i + 1];

        if (sectionLang === 'en') {
            return sectionContent.trim();
        }
    }

    // 如果都没有，返回第一个可用的内容
    return sections[2] ? sections[2].trim() : content;
}