shellphone.app/app/phone-calls/pages/keypad.tsx

import { Fragment, useRef, useState } from "react";
import type { BlitzPage } from "blitz";
import { Routes, useRouter } from "blitz";
import { atom, useAtom } from "jotai";
import { usePress } from "@react-aria/interactions";
import { Transition } from "@headlessui/react";
import { IoBackspace, IoCall } from "react-icons/io5";

import { Direction } from "db";
import AppLayout from "app/core/layouts/layout";
import Keypad from "../components/keypad";
import usePhoneCalls from "../hooks/use-phone-calls";
import useKeyPress from "../hooks/use-key-press";
import useCurrentUser from "app/core/hooks/use-current-user";
import KeypadErrorModal from "../components/keypad-error-modal";

const KeypadPage: BlitzPage = () => {
	const { hasFilledTwilioCredentials, hasPhoneNumber, hasOngoingSubscription } = useCurrentUser();
	const router = useRouter();
	const [isKeypadErrorModalOpen, setIsKeypadErrorModalOpen] = useState(false);
	const [phoneCalls] = usePhoneCalls();
	const [phoneNumber, setPhoneNumber] = useAtom(phoneNumberAtom);
	const removeDigit = useAtom(pressBackspaceAtom)[1];
	const timeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
	const intervalRef = useRef<ReturnType<typeof setInterval> | null>(null);
	const pressDigit = useAtom(pressDigitAtom)[1];
	useKeyPress((key) => {
		if (key === "Backspace") {
			return removeDigit();
		}

		pressDigit(key);
	});
	const longPressDigit = useAtom(longPressDigitAtom)[1];
	const onZeroPressProps = {
		onPressStart() {
			pressDigit("0");
			timeoutRef.current = setTimeout(() => {
				longPressDigit("+");
			}, 750);
		},
		onPressEnd() {
			if (timeoutRef.current) {
				clearTimeout(timeoutRef.current);
				timeoutRef.current = null;
			}
		},
	};
	const onDigitPressProps = (digit: string) => ({
		onPress() {
			// navigator.vibrate(1); // removed in webkit
			pressDigit(digit);
		},
	});
	const { pressProps: onBackspacePress } = usePress({
		onPressStart() {
			timeoutRef.current = setTimeout(() => {
				removeDigit();
				intervalRef.current = setInterval(removeDigit, 75);
			}, 325);
		},
		onPressEnd() {
			if (timeoutRef.current) {
				clearTimeout(timeoutRef.current);
				timeoutRef.current = null;
			}

			if (intervalRef.current) {
				clearInterval(intervalRef.current);
				intervalRef.current = null;
				return;
			}

			removeDigit();
		},
	});

	return (
		<>
			<div className="w-96 h-full flex flex-col justify-around py-5 mx-auto text-center text-black">
				<div className="h-16 text-3xl text-gray-700">
					<span>{phoneNumber}</span>
				</div>

				<Keypad onDigitPressProps={onDigitPressProps} onZeroPressProps={onZeroPressProps}>
					<button
						onClick={async () => {
							if (!hasFilledTwilioCredentials || !hasPhoneNumber) {
								setIsKeypadErrorModalOpen(true);
								return;
							}

							if (!hasOngoingSubscription) {
								// TODO
								setIsKeypadErrorModalOpen(true);
								return;
							}

							if (phoneNumber === "") {
								const lastCall = phoneCalls?.[0];
								if (lastCall) {
									const lastCallRecipient =
										lastCall.direction === Direction.Inbound ? lastCall.from : lastCall.to;
									setPhoneNumber(lastCallRecipient);
								}

								return;
							}

							await router.push(Routes.OutgoingCall({ recipient: encodeURI(phoneNumber) }));
							setPhoneNumber("");
						}}
						className="cursor-pointer select-none col-start-2 h-12 w-12 flex justify-center items-center mx-auto bg-green-800 rounded-full"
					>
						<IoCall className="w-6 h-6 text-white" />
					</button>

					<Transition
						as={Fragment}
						show={phoneNumber.length > 0}
						enter="transition duration-300 ease-in-out"
						enterFrom="transform scale-95 opacity-0"
						enterTo="transform scale-100 opacity-100"
						leave="transition duration-100 ease-out"
						leaveFrom="transform scale-100 opacity-100"
						leaveTo="transform scale-95 opacity-0"
					>
						<div {...onBackspacePress} className="cursor-pointer select-none m-auto">
							<IoBackspace className="w-6 h-6" />
						</div>
					</Transition>
				</Keypad>
			</div>
			<KeypadErrorModal closeModal={() => setIsKeypadErrorModalOpen(false)} isOpen={isKeypadErrorModalOpen} />
		</>
	);
};

const phoneNumberAtom = atom("");
const pressDigitAtom = atom(null, (get, set, digit: string) => {
	if (get(phoneNumberAtom).length > 17) {
		return;
	}

	if ("0123456789+#*".indexOf(digit) === -1) {
		return;
	}

	set(phoneNumberAtom, (prevState) => prevState + digit);
});
const longPressDigitAtom = atom(null, (get, set, replaceWith: string) => {
	if (get(phoneNumberAtom).length > 17) {
		return;
	}

	set(phoneNumberAtom, (prevState) => prevState.slice(0, -1) + replaceWith);
});
const pressBackspaceAtom = atom(null, (get, set) => {
	if (get(phoneNumberAtom).length === 0) {
		return;
	}

	set(phoneNumberAtom, (prevState) => prevState.slice(0, -1));
});

KeypadPage.getLayout = (page) => <AppLayout title="Keypad">{page}</AppLayout>;

KeypadPage.authenticate = { redirectTo: Routes.SignIn() };

export default KeypadPage;