import { NostrEvent } from "@lume/types";

export function dedupEvents(nostrEvents: NostrEvent[], nsfw: boolean = false) {
	const seens = new Set<string>();
	const events = nostrEvents.filter((event) => {
		const eTags = event.tags.filter((el) => el[0] === "e");
		const ids = eTags.map((item) => item[1]);
		const isDup = ids.some((id) => seens.has(id));

		// Add found ids to seen list
		for (const id of ids) {
			seens.add(id);
		}

		// Filter NSFW event
		if (nsfw) {
			const wTags = event.tags.filter((t) => t[0] === "content-warning");
			const isLewd = wTags.length > 0;

			return !isDup && !isLewd;
		}

		// Filter duplicate event
		return !isDup;
	});

	return events;
}