/**
 * Copyright 2024-2026 Wingify Software Pvt. 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.
 */

import { Constants } from '../constants';
import { IWingifyOptions } from '../models/WingifyOptionsModel';

export interface ISDKMeta {
  sdkName: string;
  version: string;
}

/**
 * Singleton utility to manage SDK name and version.
 *
 * Usage:
 *   SDKMetaUtil.init(options); // typically during SDK init
 *   const sdkMetaUtil = SDKMetaUtil.getInstance();
 *   const name = sdkMetaUtil.getSdkName();
 *   const version = sdkMetaUtil.getVersion();
 */
export class SDKMetaUtil {
  private static instance: SDKMetaUtil | null = null;

  private sdkName: string;
  private version: string;

  constructor(options?: IWingifyOptions | null) {
    const sdkMeta = options?.sdkMeta;
    this.sdkName = sdkMeta?._wingify_sdkName ?? sdkMeta?._vwo_sdkName ?? Constants.SDK_NAME;
    this.version = sdkMeta?._wingify_sdkVersion ?? sdkMeta?._vwo_sdkVersion ?? Constants.SDK_VERSION;
    SDKMetaUtil.instance = this;
  }

  /**
   * Returns the singleton instance. If not initialized, it initializes it with default constants for sdkName and version.
   * @returns The singleton instance.
   */
  static getInstance(): SDKMetaUtil {
    if (!SDKMetaUtil.instance) {
      SDKMetaUtil.instance = new SDKMetaUtil(null);
    }
    return SDKMetaUtil.instance;
  }

  getSdkName(): string {
    return this.sdkName;
  }

  getVersion(): string {
    return this.version;
  }

  getMeta(): ISDKMeta {
    return {
      sdkName: this.sdkName,
      version: this.version,
    };
  }
}