import { Events, type Message } from "discord.js";

import type { FeatureContext } from "@/features/context";
import type { FeatureDefinition } from "@/features/definition";

type Transform = {
	from: string;
	to: string;
};

function transform(content: string, transforms: Transform[]) {
	return transforms.reduce((acc, t) => acc.replaceAll(t.from, t.to), content);
}

async function react(ctx: FeatureContext, ev: Message) {
	const content = ev.cleanContent;

	ctx.cfg.react.reactions.forEach((r) => {
		const transformed = transform(content, r.transform);

		r.match.forEach((m) => {
			if (transformed.search(m.regex) !== -1) {
				ctx.logger.info(
					{
						feature: "react",
						message: ev.id,
						name: r.name,
					},
					"Reacted!",
				);

				ev.react(r.reactionId);
			}
		});
	});
}

/*
Responds with a given emoji, if a message matches some pattern.
*/
export const feature = {
	name: "react",
	events: {
		[Events.MessageCreate]: react,
	},
} satisfies FeatureDefinition;