import { marked } from 'marked';
import { ParsedAttributes, parse_attributes } from './attrs';
import { MarkdownOptions } from './render';

export interface SectionToken extends marked.Tokens.Generic {
	text: string;
	attrs: ParsedAttributes;
}

export function section_ext(renderer: marked.Renderer, opts: MarkdownOptions) : marked.TokenizerExtension & marked.RendererExtension {
	return {
		name: 'section',
		level: 'block',
		start: (src) => src.match(/^!!!/)?.index,
		tokenizer(src, tokens) {
			const rule = /^!!!(!*)([^\n]+)?(?:\n)((?:[^!]|!!?(?!!\1))+)!!!\1/;
			const match = rule.exec(src);

			if (match) {
				const token: SectionToken = {
					type: 'section',
					raw: match[0],
					text: match[3],
					attrs: parse_attributes(match[2] || ''),
					tokens: [ ],
				};

				this.lexer.blockTokens(match[3], token.tokens);
				return token;
			}
		},
		renderer(token: SectionToken) {
			return `<section ${token.attrs.html_attrs.join(' ')}>${this.parser.parse(token.tokens)}</section>`;
		}
	};
}