/*
* Copyright (c) 2021 Huawei Device Co., Ltd.
* 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.
*/

/**
 * @file
 * @kit ArkData
 */

import { AsyncCallback, Callback } from './@ohos.base';

/**
 * Provides interfaces to obtain and modify storage data.
 *
 * @name storage
 * @since 6
 * @deprecated since 9
 * @useinstead ohos.preferences.preferences
 * @syscap SystemCapability.DistributedDataManager.Preferences.Core
 *
 */


declare namespace storage {
  /**
   * Obtains a {@link Storage} instance matching a specified storage file name.
   *
   * <p>The {@link references} instance loads all data of the storage file and
   * resides in the memory. You can use removeStorageFromCache to remove the instance from the memory.
   *
   * @param path Indicates the path of storage file stored.
   * @returns Returns the {@link Storage} instance matching the specified storage file name.
   * @throws BusinessError if invoked failed
   * @since 6
   * @deprecated since 9
   * @useinstead ohos.preferences.preferences.getPreferences
   */

  function getStorageSync(path: string): Storage;
  function getStorage(path: string, callback: AsyncCallback<Storage>): void;
  function getStorage(path: string): Promise<Storage>;

  /**
   * Deletes a {@link Storage} instance matching a specified storage file name
   * from the cache which is performed by removeStorageFromCache and deletes the
   * storage file.
   *
   * <p>When deleting the {@link Storage} instance, you must release all references
   * of the instance. In addition, do not use the instance to perform data operations. Otherwise, inconsistent data
   * will occur.
   *
   * @param path Indicates the path of storage file
   * @throws BusinessError if invoked failed
   * @since 6
   * @deprecated since 9
   * @useinstead ohos.preferences.preferences.deletePreferences
   */
  function deleteStorageSync(path: string): void;
  function deleteStorage(path: string, callback: AsyncCallback<void>): void;
  function deleteStorage(path: string): Promise<void>;

  /**
   * Deletes a {@link Storage} instance matching a specified storage file name
   * from the cache.
   *
   * <p>When deleting the {@link Storage} instance, you must release all references
   * of the instance. In addition, do not use the instance to perform data operations. Otherwise, inconsistent data
   * will occur.
   *
   * @param path Indicates the path of storage file.
   * @throws BusinessError if invoked failed
   * @since 6
   * @deprecated since 9
   * @useinstead ohos.preferences.preferences.removePreferencesFromCache
   */
  function removeStorageFromCacheSync(path: string): void;
  function removeStorageFromCache(path: string, callback: AsyncCallback<void>): void;
  function removeStorageFromCache(path: string): Promise<void>;

  /**
   * Provides interfaces to obtain and modify storage data.
   *
   * <p>The storage data is stored in a file, which matches only one {@link Storage} instance in the memory.
   * You can use getStorage to obtain the {@link Storage} instance matching
   * the file that stores storage data, and use removeStorageFromCache
   * to remove the {@link Storage} instance from the memory.
   *
   * @syscap SystemCapability.DistributedDataManager.Preferences.Core
   *
   * @since 6
   * @deprecated since 9
   * @useinstead ohos.preferences.preferences
   */
  interface Storage {
    /**
    * Obtains the value of a storage in the int format.
    *
    * <p>If the value is {@code null} or not in the int format, the default value is returned.
    *
    * @param key Indicates the key of the storage. It cannot be {@code null} or empty.
    * @param defValue Indicates the default value to return.
    * @returns Returns the value matching the specified key if it is found; returns the default value otherwise.
    * @throws BusinessError if invoked failed
    * @since 6
    * @deprecated since 9
    * @useinstead ohos.preferences.preferences.get
    */
    getSync(key: string, defValue: ValueType): ValueType;
    get(key: string, defValue: ValueType, callback: AsyncCallback<ValueType>): void;
    get(key: string, defValue: ValueType): Promise<ValueType>;

    /**
     * Checks whether the {@link Storage} object contains a storage matching a specified key.
     *
     * @param key Indicates the key of the storage to check for.
     * @returns Returns {@code true} if the {@link Storage} object contains a storage with the specified key;
     * returns {@code false} otherwise.
     * @throws BusinessError if invoked failed
     * @since 6
     * @deprecated since 9
     * @useinstead ohos.preferences.preferences.has
     */
    hasSync(key: string): boolean;
    has(key: string, callback: AsyncCallback<boolean>): boolean;
    has(key: string): Promise<boolean>;

    /**
     * Sets an int value for the key in the {@link Storage} object.
     *
     * <p>You can call the {@link #flush} or {@link #flushSync} method to save the {@link Storage} object to the
     * file.
     *
     * @param key Indicates the key of the storage to modify. It cannot be {@code null} or empty.
     * @param value Indicates the value of the storage.
     * <tt>MAX_KEY_LENGTH</tt>.
     * @throws BusinessError if invoked failed
     * @since 6
     * @deprecated since 9
     * @useinstead ohos.preferences.preferences.put
     */
    putSync(key: string, value: ValueType): void;
    put(key: string, value: ValueType, callback: AsyncCallback<void>): void;
    put(key: string, value: ValueType): Promise<void>;

    /**
     * Deletes the storage with a specified key from the {@link Storage} object.
     *
     * <p>You can call the {@link #flush} method to save the {@link Storage} object to the
     * file.
     *
     * @param key Indicates the key of the storage to delete. It cannot be {@code null} or empty.
     * <tt>MAX_KEY_LENGTH</tt>.
     * @throws BusinessError if invoked failed
     * @since 6
     * @deprecated since 9
     * @useinstead ohos.preferences.preferences.delete
     */
    deleteSync(key: string): void;
    delete(key: string, callback: AsyncCallback<void>): void;
    delete(key: string): Promise<void>;

    /**
     * Clears all storage from the {@link Storage} object.
     *
     * <p>You can call the {@link #flush} method to save the {@link Storage} object to the
     * file.
     *
     * @throws BusinessError if invoked failed
     * @since 6
     * @deprecated since 9
     * @useinstead ohos.preferences.preferences.clear
     */
    clearSync(): void;
    clear(callback: AsyncCallback<void>): void;
    clear(): Promise<void>;

    /**
     * Asynchronously saves the {@link Storage} object to the file.
     *
     * @throws BusinessError if invoked failed
     * @since 6
     * @deprecated since 9
     * @useinstead ohos.preferences.preferences.flush
     */
    flushSync(): void;
    flush(callback: AsyncCallback<void>): void;
    flush(): Promise<void>;

    /**
     * Registers an observer to listen for the change of a {@link Storage} object.
     *
     * @param callback Indicates the callback when storage changes.
     * @throws BusinessError if invoked failed
     * @since 6
     * @deprecated since 9
     * @useinstead ohos.preferences.preferences.on
     */
    on(type: 'change', callback: Callback<StorageObserver>): void;

    /**
     * Unregister an existing observer.
     *
     * @param callback Indicates the registered callback.
     * @throws BusinessError if invoked failed
     * @since 6
     * @deprecated since 9
     * @useinstead ohos.preferences.preferences.off
     */
    off(type: 'change', callback: Callback<StorageObserver>): void;
  }

  /**
   * Indicates possible value types
   */
  type ValueType = number | string | boolean;

  /**
   * Define the change data information object.
   *
   * @syscap SystemCapability.DistributedDataManager.Preferences.Core
   *
   * @since 6
   * @deprecated since 9
   */
  interface StorageObserver {
    /**
     * Indicates which key changes
     */
    key: string;
  }

  /**
   * Indicates the maximum length of a key (80 characters).
   */
  const MAX_KEY_LENGTH: 80;

  /**
   * Indicates the maximum length of a string (8192 characters).
   */
  const MAX_VALUE_LENGTH: 8192;
}

export default storage;