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

export interface ContentMetadata {
    title: string;
    description: string;
    date: string;
    author: string;
    category: string;
    tags: string[];
    draft?: boolean;
    featured?: boolean;
}

export interface ContentItem {
    slug: string;
    metadata: ContentMetadata;
    content: string;
}

const contentDirectory = path.join(process.cwd(), 'content');

export function getContentData(lang: string, slug: string): ContentItem {
    const fullPath = path.join(contentDirectory, lang, `${slug}.md`);

    if (!fs.existsSync(fullPath)) {
        throw new Error(`Content not found: ${fullPath}`);
    }

    const fileContents = fs.readFileSync(fullPath, 'utf8');
    const { data, content } = matter(fileContents);

    return {
        slug,
        metadata: data as ContentMetadata,
        content,
    };
}

export function getAllContent(lang: string): ContentItem[] {
    const langDirectory = path.join(contentDirectory, lang);

    if (!fs.existsSync(langDirectory)) {
        return [];
    }

    const files = fs.readdirSync(langDirectory);

    return files
        .filter((file) => file.endsWith('.md'))
        .map((file) => {
            const slug = file.replace('.md', '');
            return getContentData(lang, slug);
        })
        .filter((item) => !item.metadata.draft)
        .sort((a, b) => new Date(b.metadata.date).getTime() - new Date(a.metadata.date).getTime());
}

export function getContentByCategory(lang: string, category: string): ContentItem[] {
    const allContent = getAllContent(lang);
    return allContent.filter((item) => item.metadata.category === category);
}

export function getContentByTag(lang: string, tag: string): ContentItem[] {
    const allContent = getAllContent(lang);
    return allContent.filter((item) => item.metadata.tags && item.metadata.tags.includes(tag));
}

export function searchContent(lang: string, query: string): ContentItem[] {
    const allContent = getAllContent(lang);
    const searchQuery = query.toLowerCase();

    return allContent.filter((item) => {
        const searchText =
            `${item.metadata.title} ${item.metadata.description} ${item.content}`.toLowerCase();
        return searchText.includes(searchQuery);
    });
}

export function getAllCategories(lang: string): string[] {
    const allContent = getAllContent(lang);
    const categories = allContent.map((item) => item.metadata.category);
    return [...new Set(categories)].filter(Boolean);
}

export function getAllTags(lang: string): string[] {
    const allContent = getAllContent(lang);
    const tags = allContent.flatMap((item) => item.metadata.tags || []);
    return [...new Set(tags)].filter(Boolean);
}