frontend/src/context/CustomerContext.tsx

// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import {
  createContext,
  Dispatch,
  ReactNode,
  SetStateAction,
  useContext,
  useMemo,
  useState,
} from 'react';

type CustomerContextType = {
  customerId: string;
  setCustomerId: Dispatch<SetStateAction<string>>;
};

const CustomerContext = createContext<CustomerContextType>({
  customerId: '',
  setCustomerId: () => {
    // Initial
  },
});

type Props = {
  children: ReactNode;
};

export const CustomerProvider = ({ children }: Props) => {
  const [customerId, setCustomerId] = useState('');
  const value = useMemo(
    () => ({
      customerId,
      setCustomerId,
    }),
    [customerId],
  );

  return (
    <CustomerContext.Provider value={value}>
      {children}
    </CustomerContext.Provider>
  );
};

export const useCustomer = () => useContext(CustomerContext);