import { ifInline, matches } from '../modules/utils'

function inlineEmbed(_){
	let regexInline = _.options.link ? new RegExp(`([^>]*${_.regex.source})<\/a>`, 'gm') : new RegExp(`([^\\s]*${_.regex.source})`, 'gm');
	_.output     = _.output.replace(regexInline, function(match) {
		let url = _.options.link ? match.slice(0, -4) : match;
		if (_.options.served.indexOf(url) === -1) {
			_.options.served.push(url);
			if (_.options.link) {
				return !_.options.inlineText ? _.template(match.slice(0, -4)) + '</a>' : match + _.template(match.slice(0, -4))
			} else {
				return !_.options.inlineText ? _.template(match) : match + _.template(match)
			}
		} else {
			return match; //TODO : check whether this should be `match`
		}
	});
	return [_.output, _.embeds];
}

function normalEmbed(_){
	let match;
	while ((match = matches(_.regex, _.input)) !== null) {
		let url = match[0];
		if (!(_.options.served.indexOf(url) === -1) || (_.options.served.length && _.options.singleEmbed)) continue;
		_.options.served.push(url);
		let text = _.template(url);
		_.embeds.push({
			text : text,
			index: match.index
		})
	}
	return [_.output, _.embeds];
}

export default function embed(_){
	return (ifInline(_.options, _.service)) ? inlineEmbed(_) : normalEmbed(_)
}