import fs from "fs"
import matter from "gray-matter"
import path from "path"
import moment from "moment"
import {remark} from "remark";
import html from "remark-html"

import type {ArticleItem} from "@/types";

const articlesDirectory = path.join(process.cwd(), "articles");

export const getSortedArticles = (): ArticleItem[] => {
    const fileNames = fs.readdirSync(articlesDirectory);

    const allArticlesData = fileNames.map((fileName) => {
        const id = fileName.replace(/\.md$/, "");

        const fullPath = path.join(articlesDirectory, fileName);
        const fileContents = fs.readFileSync(fullPath, "utf8");

        const matterResult = matter(fileContents);

        return {
            id,
            title: matterResult.data.title,
            date: matterResult.data.date,
            category: matterResult.data.category,
        }
    })

    return allArticlesData.sort((a, b) => {
        const format = "DD-MM-YYYY";
        const dateOne = moment(a.date, format);
        const dateTwo = moment(b.date, format);

        return dateTwo.valueOf() - dateOne.valueOf();
    })
}

export const getCategorizedArticles = (): Record<string, ArticleItem[]> => {
    const sortedArticles = getSortedArticles();
    const categorisedArticles: Record<string, ArticleItem[]> = {}

    sortedArticles.forEach((article) => {
        if (!categorisedArticles[article.category]) {
            categorisedArticles[article.category] = []
        }
        categorisedArticles[article.category].push(article);
    })

    return categorisedArticles;
}

export const getArticleData = async (id: string) => {
    const fullPath = path.join(articlesDirectory, `${id}.md`);

    const fileContents = fs.readFileSync(fullPath, "utf8");

    const matterResult = matter(fileContents);

    const processedContent = await remark()
        .use(html)
        .process(matterResult.content)

    const contentHtml = processedContent.toString();

    return {
        id,
        contentHtml,
        title: matterResult.data.title,
        category: matterResult.data.category,
        date: moment(matterResult.data.date, "DD-MM-YYYY").format("MMMM Do YYYY")
    }
}