import { format } from "date-fns";
import { marked } from "marked";

export type NewsArticle = {
    title: string;
    date: string;
    summary: string;
    image?: string;
    slug: string;
    body: string;
    html: string;
};

type Frontmatter = Partial<Pick<NewsArticle, "title" | "date" | "summary" | "image" | "slug">>;

const newsModules = import.meta.glob("/src/content/news/*.md", {
    eager: true,
    as: "raw",
});

const parseFrontmatter = (raw: string): { frontmatter: Frontmatter; body: string } => {
    const frontmatterMatch = raw.match(/^---\s*([\s\S]*?)\s*---\s*([\s\S]*)$/);
    if (!frontmatterMatch) {
        return { frontmatter: {}, body: raw.trim() };
    }

    const [, frontmatterBlock, body] = frontmatterMatch;
    const frontmatter: Frontmatter = {};

    frontmatterBlock.split("\n").forEach((line) => {
        const trimmed = line.trim();
        if (!trimmed || trimmed.startsWith("#")) return;
        const [key, ...rest] = trimmed.split(":");
        if (!key || rest.length === 0) return;
        const value = rest.join(":").trim().replace(/^["']|["']$/g, "");
        if (key in frontmatter) return;
        (frontmatter as Record<string, string>)[key.trim()] = value;
    });

    return { frontmatter, body: body.trim() };
};

export const newsArticles: NewsArticle[] = Object.entries(newsModules)
    .map(([path, raw]) => {
        const { frontmatter, body } = parseFrontmatter(raw);
        const slug =
            frontmatter.slug ||
            path.split("/").pop()?.replace(/\.md$/, "") ||
            "";

        return {
            title: frontmatter.title || slug,
            date: frontmatter.date || "",
            summary: frontmatter.summary || "",
            image: frontmatter.image,
            slug,
            body,
            html: marked.parse(body),
        };
    })
    .sort((a, b) => {
        const aDate = Date.parse(a.date);
        const bDate = Date.parse(b.date);
        if (Number.isNaN(aDate) || Number.isNaN(bDate)) {
            return b.title.localeCompare(a.title);
        }
        return bDate - aDate;
    });

export const getNewsArticle = (slug: string): NewsArticle | undefined =>
    newsArticles.find((article) => article.slug === slug);

export const formatNewsDate = (date: string): string => {
    const parsed = Date.parse(date);
    if (Number.isNaN(parsed)) return date;
    return format(new Date(parsed), "MMM yyyy");
};