package org.vaadin.firitin.util;

import com.vaadin.flow.component.UI;

/**
 * Wrapper for similarly named Browser API. WebStorage may be
 * handy to save some data that you want to be stored on the
 * client side, instead of e.g. database on the server. An
 * example could be certain UI settings that the same users
 * might want to have set differently based on their device.
 *
 * @deprecated Available as pretty much such in Vaadin core.
 */
@Deprecated(forRemoval = true)
public class WebStorage {

    public enum Storage {
        /**
         * Web storage saved in the browser "permanently".
         */
        localStorage,
        /**
         * Web storage saved in the browser until the browser is closed
         */
        sessionStorage
    }

    public interface Callback {
        void onValueDetected(String value);
    }

    /**
     * Sets given key-value pair to Storage.localStorage
     *
     * @param key   the key
     * @param value the value
     */
    @Deprecated(forRemoval = true)
    public static void setItem(String key, String value) {
        setItem(Storage.localStorage, key, value);
    }

    /**
     * Sets given key-value pair to give storage type
     *
     * @param storage the storage type
     * @param key     the key
     * @param value   the value
     */
    @Deprecated(forRemoval = true)
    public static void setItem(Storage storage, String key, String value) {
        setItem(UI.getCurrent(), storage, key, value);
    }

    /**
     * Sets given key-value pair to give storage type
     *
     * @param ui      the UI for which the storage is related to
     * @param storage the storage type
     * @param key     the key
     * @param value   the value
     */
    @Deprecated(forRemoval = true)
    public static void setItem(UI ui, Storage storage, String key, String value) {
        ui.getPage().executeJs("window[$0].setItem($1,$2)", storage.toString(), key, value);
    }

    /**
     * Removes the value associated by the given key from the Storage.localStorage
     *
     * @param key the key to be deleted
     */
    @Deprecated(forRemoval = true)
    public static void removeItem(String key) {
        removeItem(Storage.localStorage, key);
    }

    /**
     * Removes the value associated by the given key from the Storage.localStorage
     *
     * @param storage the storage type from which the value will be removed
     * @param key     the key to be deleted
     */
    @Deprecated(forRemoval = true)
    public static void removeItem(Storage storage, String key) {
        removeItem(UI.getCurrent(), storage, key);
    }

    /**
     * Removes the value associated by the given key from the Storage.localStorage
     *
     * @param ui      the UI for which the storage is related to
     * @param storage the storage type from which the value will be removed
     * @param key     the key to be deleted
     */
    @Deprecated(forRemoval = true)
    public static void removeItem(UI ui, Storage storage, String key) {
        ui.getPage().executeJs("window[$0].removeItem($1)", storage.toString(), key);
    }

    /**
     * Clears all values from the Storage.localStorage
     */
    @Deprecated(forRemoval = true)
    public static void clear() {
        clear(Storage.localStorage);
    }

    /**
     * Clears the given storage.
     *
     * @param storage the storage
     */
    public static void clear(Storage storage) {
        clear(UI.getCurrent(), storage);
    }

    /**
     * Clears the given storage.
     *
     * @param ui      the UI for which the storage is related to
     * @param storage the storage
     */
    @Deprecated(forRemoval = true)
    public static void clear(UI ui, Storage storage) {
        ui.getPage().executeJs("window[$0].clear()", storage.toString());
    }

    /**
     * Asynchronously gets an item from the Storage.localStorage
     *
     * @param key      the key for which the value will be fetched
     * @param callback the callback that gets the value once transferred from the client side
     */
    @Deprecated(forRemoval = true)
    public static void getItem(String key, Callback callback) {
        getItem(Storage.localStorage, key, callback);
    }

    /**
     * Asynchronously gets an item from the given storage
     *
     * @param storage the storage
     * @param key      the key for which the value will be fetched
     * @param callback the callback that gets the value once transferred from the client side
     */
    @Deprecated(forRemoval = true)
    public static void getItem(Storage storage, String key, Callback callback) {
        getItem(UI.getCurrent(), storage, key, callback);
    }

    /**
     * Asynchronously gets an item from the given storage
     *
     * @param ui      the UI for which the storage is related to
     * @param storage the storage
     * @param key      the key for which the value will be fetched
     * @param callback the callback that gets the value once transferred from the client side
     */
    @Deprecated(forRemoval = true)
    public static void getItem(UI ui, Storage storage, String key, Callback callback) {
        ui.getPage()
                .executeJs("return window[$0].getItem($1);", storage.toString(), key)
                .then(String.class, callback::onValueDetected, s -> {
                    // for error (most likely non-existing mapping), return null
                    callback.onValueDetected(null);
                })
        ;
    }

}