import { useState, useEffect } from "react";

export function useLocalStorage<T>(
  key: string,
  initialValue: T,
): [T, (value: T) => void] {
  // State to store our value
  const [storedValue, setStoredValue] = useState<T>(() => {
    if (typeof window === "undefined") {
      return initialValue;
    }

    try {
      // Get from local storage by key
      const item = window.localStorage.getItem(key);
      // Parse stored json or if none return initialValue
      return item ? JSON.parse(item) : initialValue;
    } catch (error) {
      // If error also return initialValue
      console.error("Error reading from localStorage:", error);
      return initialValue;
    }
  });

  // Return a wrapped version of useState's setter function that
  // persists the new value to localStorage.
  const setValue = (value: T) => {
    try {
      // Allow value to be a function so we have same API as useState
      const valueToStore =
        value instanceof Function ? value(storedValue) : value;
      // Save state
      setStoredValue(valueToStore);
      // Save to local storage
      if (typeof window !== "undefined") {
        window.localStorage.setItem(key, JSON.stringify(valueToStore));
      }
    } catch (error) {
      // A more advanced implementation would handle the error case
      console.error("Error writing to localStorage:", error);
    }
  };

  // Update local storage if key changes
  useEffect(() => {
    const item = window.localStorage.getItem(key);
    if (item) {
      try {
        const parsedItem = JSON.parse(item);
        if (JSON.stringify(parsedItem) !== JSON.stringify(storedValue)) {
          setStoredValue(parsedItem);
        }
      } catch (error) {
        console.error("Error parsing localStorage item:", error);
      }
    } else if (storedValue !== initialValue) {
      window.localStorage.setItem(key, JSON.stringify(storedValue));
    }
  }, [key, initialValue]);

  return [storedValue, setValue];
}
