import type { Log, Cache } from "../index.js"

export class LogStore implements Cache.LogCache {
	#logs: Map<string, Log> = new Map
	#users: Set<string> = new Set

	has(handle: string): ReturnType<Cache.LogCache['has']> {
		return this.#logs.has(handle)
	}

	update(logs: Set<Log>): ReturnType<Cache.LogCache['update']> {
		const future = new Map<string, Log>
		const users = new Set<string>
		const result = {
			updated: new Set<Log>,
			deleted: new Set<string>
		}

		for (const log of logs) {
			future.set(log.user.handle, log)
			users.add(log.user.handle)

			if (this.#logs.get(log.user.handle)?.timestamp.getTime() !== log.timestamp.getTime())
				result.updated.add(log)
		}

		result.deleted = this.#users.difference(users)
		this.#users = users
		this.#logs = future

		return result
	}
}