import MessageBus from 'src/sdk/MessageBus';

export default abstract class AbstractService {

  protected static readonly messageBus: MessageBus = MessageBus.getInstance();

  private static readonly CACHE_TTL = 60 * 60 * 1000; // 60 minutes cache TTL

  protected constructor() { }

  protected static setItem(key: string, process: any): void {
    const list: any[] = JSON.parse(sessionStorage.getItem(key) || '[]');

    const index: number = list.findIndex((item: any) => item.process.processData.uid === process.processData.uid);
    if (index !== -1) {
      list[index] = {
        process: process,
        timestamp: Date.now()
      };
    } else {
      list.push({
        process: process,
        timestamp: Date.now()
      });
    }

    sessionStorage.setItem(key, JSON.stringify(list));
  }

  protected static getItem(key: string, uid: string): any {
    const list: any[] = JSON.parse(sessionStorage.getItem(key) || '[]');
    if (list.length === 0) {
      return null;
    }

    const item: any = list.find((item: any) => item.process.processData.uid === uid);
    if (!item) {
      return null;
    }

    const now: number = Date.now();
    if ((now - item.timestamp) < this.CACHE_TTL) {
      return item.process;
    }

    return null;
  }

  protected static getItems(key: string): any[] {
    const list: any[] = JSON.parse(sessionStorage.getItem(key) || '[]');
    const now: number = Date.now();

    const items: any[] = [];
    for (const item of list) {
      if (now - item.timestamp < this.CACHE_TTL) {
        items.push(item.process);
      }
    }

    return items;
  }

  protected static removeItem(key: string, uid: string): void {
    const list: any[] = JSON.parse(sessionStorage.getItem(key) || '[]');

    const index: number = list.findIndex((item: any) => item.process.processData.uid === uid);
    if (index !== -1) {
      list.splice(index, 1);
    }

    sessionStorage.setItem(key, JSON.stringify(list));
  }
}