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

import {
	create,
	clearField,
	type DescMessage,
	type MessageShape,
	type MessageInitShape,
} from "@bufbuild/protobuf";
import { TZDate, tz } from "@date-fns/tz";
import { DateSchema } from "@yamori/proto/yamori/type/v1/date_pb.js";
import { type DateArg, getYear, getMonth, getDate } from "date-fns";

export const TZ = "Asia/Tokyo";

export function jst(d: MessageInitShape<typeof DateSchema>) {
	if (typeof d.year !== "number") {
		throw new Error("Cannot convert year-less date to Date");
	}

	if (typeof d.month !== "number") {
		throw new Error("Cannot convert month-less date to Date");
	}

	if (typeof d.day !== "number") {
		throw new Error("Cannot convert day-less date to Date");
	}

	return new TZDate(d.year, d.month - 1, d.day, "Asia/Tokyo");
}

export function toProtoDate<DateType extends Date>(d: DateArg<DateType>) {
	return create(DateSchema, {
		year: getYear(d, { in: tz(TZ) }),
		month: getMonth(d, { in: tz(TZ) }) + 1,
		day: getDate(d, { in: tz(TZ) }),
	});
}

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 MessageInitShape<Message>,
>(
	schema: Message,
	mask: { fields: readonly number[] },
	message: Data,
): MessageShape<Message> {
	if (!mask.fields.length) {
		return create(schema, message);
	}

	const masked = create(schema, { ...message });

	for (const field of schema.fields) {
		if (!mask.fields.includes(field.number)) {
			// `create` されたオブジェクトの repeated フィールドを `undefined` にすると
			// ランタイムでエラーが発生するといった、 Buf が型に見た幻想のツケが回って
			// くるため `delete` 文や `undefined` 代入は使わずに API を使う。
			clearField(masked, field);
		}
	}

	return masked;
}

export function packDate({
	year,
	month,
	day,
}: MessageInitShape<typeof DateSchema>): number {
	return (
		((year ?? 0) << 9) |
		(Math.min(month ?? 0, 12) << 5) |
		(Math.min(day ?? 1, 31) & 0b11111)
	);
}

export function unpackDate(date: number): MessageInitShape<typeof DateSchema> {
	return {
		year: date >> 9,
		month: (date >> 5) & 0b1111,
		day: date & 0b11111,
	};
}

export function createRandomBytes(byteLength: number = 16): Uint8Array {
	const buffer = new Uint8Array(byteLength);
	self.crypto.getRandomValues(buffer);
	return buffer;
}