import { Auth } from "firebase-admin/auth";
import * as uca from "unicode-collation-algorithm2";

import * as fw from "./fw";
import * as types from "./types";
import * as crypto from "crypto";

export function eraseUndefined<T>(values: { [index: string]: any }) {
	Object.keys(values).forEach((key) => {
		if (values[key] === undefined) {
			delete values[key];
		}
	});
	return values as T;
}

export function verifyIdToken(idToken: string, auth: Auth) {
	try {
		return auth.verifyIdToken(idToken);
	} catch (error: any) {
		const errorCode = error.code as string | undefined;
		// see: https://firebase.google.com/docs/reference/js/firebase.auth.Error
		// see: https://firebase.google.com/docs/auth/admin/errors
		if (errorCode != null) {
			if (errorCode.endsWith("revoked") || errorCode.endsWith("expired")) {
				throw new types.IdTokenExpiredError();
			}
		}
		throw new fw.types.Unauthorized(error.message);
	}
}

export function getValidAnswerIndex(inputAnswer: string, answers: string[]) {
	return answers.findIndex((answer) => {
		return uca.compare(inputAnswer, answer) === 0;
	});
}

export function createRoomId(): string {
	const seed = "qwertyupasdfghjkxcvbnm1234567890";
	const roomIdLength = 8;
	const roomId = Array.from(crypto.randomBytes(roomIdLength))
		.map((n) => seed[n % seed.length])
		.join("");
	return roomId;
}

export function createPlayId(roomId: string): string {
	// 以前はここでsabi加工入っていたけどなくなった
	return roomId;
}