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// SPDX-FileCopyrightText: 2024 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

import { type DescMessage, type MessageInitShape } from "@bufbuild/protobuf";

export function isSameBytes(a: Uint8Array, b: Uint8Array): boolean {
	if (a.byteLength !== b.byteLength) {
		return false;
	}

	for (let i = a.length; i >= 0; i--) {
		if (a[i] !== b[i]) {
			return false;
		}
	}

	return true;
}

export function maskMessage<
	Message extends DescMessage,
	Data extends Readonly<MessageInitShape<Message>>,
>(schema: Message, mask: { fields: readonly number[] }, message: Data): Data {
	const init: Data = { ...message };

	for (const field of schema.fields) {
		if (!mask.fields.includes(field.number)) {
			delete init[field.localName as keyof Data];
		}
	}

	return init;
}