import type { Config } from '~~/locale/config.ts';

export interface PostMetadata {
    title: string;
    date: string;
    authors: string[];
    hero: { src: string; alt: string; class: string } | undefined;
}

export interface Post extends PostMetadata {
    slug: string;
}

export interface PostWithContent extends Post {
    content: string;
}

export const extractMetadata = (config: Config, content: string): PostMetadata | undefined => {
    const lines = content.split('\n').filter((l) => !!l);

    const title = lines[0]?.match(/^# (.*)$/)?.[1];

    const secondLineMatch = lines[1]?.match(/^<small>(\d\d\d\d-\d\d-\d\d) \| ([^|]*).*<\/small>$/);
    const date = secondLineMatch?.[1];
    const authors = secondLineMatch?.[2].split(',').map((a) => {
        a = a.trim();
        const teamName = config.contact.team?.route;
        if (teamName && a.startsWith(teamName)) {
            return teamName;
        }
        const m = a.match(/^\[([^\]]+)]/);
        if (m) {
            return m[1];
        }
        return a;
    }) ?? [];

    let hero = undefined;
    const classHeroImages = lines
        .map((x) => x.match(/<img src="([^"]+)" class="hero([^"]*)" alt="([^"]*)"/))
        .filter((x) => !!x);
    if (classHeroImages.length) {
        hero = {
            src: classHeroImages[0][1],
            alt: classHeroImages[0][3],
            class: classHeroImages[0][2].replace('d-none', ''),
        };
    } else {
        const images = lines.map((x) => x.match(/^!\[([^\]]*)]\(([^)]+)\)$/)).filter((x) => !!x);
        if (images.length) {
            hero = {
                src: images[0][2],
                alt: images[0][1],
                class: '',
            };
        }
    }

    if (title === undefined || date === undefined) {
        return undefined;
    }
    return { title, date, authors, hero };
};