/**
 * Dummy implementation of Storage interface with empty methods.
 */
class DummyLocalStorage {
    /**
     * Empty function
     */
    getItem() { }

    /**
     * Empty function
     */
    setItem() { }

    /**
     * Empty function
     */
    removeItem() { }
}

/**
 * Wrapper class for browser's local storage object.
 */
class JitsiLocalStorage extends DummyLocalStorage {
    /**
     * @constructor
     * @param {Storage} storage browser's local storage object.
     */
    constructor(storage) {
        super();
        this.storage = storage || new DummyLocalStorage();
    }

    /**
     * Returns that passed key's value.
     * @param {string} keyName the name of the key you want to retrieve
     * the value of.
     * @returns {String|null} the value of the key. If the key does not exist,
     * null is returned.
     */
    getItem(keyName) {
        return this.storage.getItem(keyName);
    }

    /**
     * Adds a key to the storage, or update key's value if it already exists.
     * @param {string} keyName the name of the key you want to create/update.
     * @param {string} keyValue the value you want to give the key you are
     * creating/updating.
     */
    setItem(keyName, keyValue) {
        return this.storage.setItem(keyName, keyValue);
    }

    /**
     * Remove a key from the storage.
     * @param {string} keyName the name of the key you want to remove.
     */
    removeItem(keyName) {
        return this.storage.removeItem(keyName);
    }
}

export default new JitsiLocalStorage(window.localStorage);