import { type PersistStorage, type StorageValue } from "zustand/middleware";

/** Per-call localStorage so persist still works after SSR, where the store
    module evaluates before a Storage exists. */
export function browserStorage<T>(): PersistStorage<T> {
  return {
    getItem: (name) => {
      const raw = read(name);
      if (raw === null) return null;
      try {
        return JSON.parse(raw) as StorageValue<T>;
      } catch {
        return null;
      }
    },
    setItem: (name, value) => {
      write(name, JSON.stringify(value));
    },
    removeItem: (name) => {
      write(name, null);
    },
  };
}

function read(name: string): string | null {
  try {
    if (typeof localStorage === "undefined") return null;
    return localStorage.getItem(name);
  } catch {
    return null;
  }
}

function write(name: string, value: string | null): void {
  try {
    if (typeof localStorage === "undefined") return;
    if (value === null) localStorage.removeItem(name);
    else localStorage.setItem(name, value);
  } catch {
    /* quota, private mode, or a denied store */
  }
}