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// ワーカーとメインスレッド間でやりとりするメッセージフォーマット。
// 及びそのヘルパ関数。
//
// SPDX-FileCopyrightText: 2024 Shota FUJI <pockawoooh@gmail.com>
// SPDX-License-Identifier: AGPL-3.0-only

import {
	create,
	toBinary,
	type DescMethod,
	type MessageInitShape,
} from "@bufbuild/protobuf";

export interface Message {
	service: string;
	method: string;
	data: Uint8Array;
}

export function isValidMessage(x: unknown): x is Message {
	if (typeof x !== "object" || !x) {
		return false;
	}

	if (!("service" in x && typeof x.service === "string" && x.service)) {
		return false;
	}

	if (!("method" in x && typeof x.method === "string" && x.method)) {
		return false;
	}

	if (!("data" in x && x.data instanceof Uint8Array)) {
		return false;
	}

	return true;
}

export function requestMessage<Method extends DescMethod>(
	method: Method,
	data: MessageInitShape<Method["input"]>,
): Message {
	const binary = toBinary(method.input, create(method.input, data));

	return {
		service: method.parent.typeName,
		method: method.name,
		data: binary,
	};
}

export function responseMessage<Method extends DescMethod>(
	method: Method,
	data: MessageInitShape<Method["output"]>,
): Message {
	const binary = toBinary(method.output, create(method.output, data));

	return {
		service: method.parent.typeName,
		method: method.name,
		data: binary,
	};
}