import { ScrapeEngine, ScrapeResult, ScrapedPost } from "../ScrapeEngine";

export default class Fallback implements ScrapeEngine {
    name = "fallback";

    canImport(location: Location): boolean {
        return false;
    }

    scrapeDocument(document: Document): ScrapeResult {
        function getSize(el: HTMLImageElement) {
            return el.width * el.height;
        }

        // Get largest img element on this page
        const largestImgElement = Array.from(document.getElementsByTagName('img'))
            .reduce((a, b) => getSize(a) > getSize(b) ? a : b);

        let result = new ScrapeResult(this.name);

        if (largestImgElement) {
            let post = new ScrapedPost();
            post.source = document.location.href;
            post.imageUrl = largestImgElement.src;
            result.posts.push(post);
        }

        return result;
    }
}