/**
  * Get process instance filter for given filter id
  * @param appName Name of the target app
  * @param id Id of the target process instance filter
  * @returns Details of process filter
  */
 getProcessFilterById(appName: string, id: string): ProcessFilterCloudModel {
     const user: IdentityUserModel = this.identityUserService.getCurrentUserInfo();
     const key = `process-filters-${appName}-${user.username}`;
     let filters = [];
     filters = JSON.parse(this.storage.getItem(key)) || [];
     return filters.filter((filterTmp: ProcessFilterCloudModel) => id === filterTmp.id)[0];
 }

    /**
     * Adds a new process instance filter
     * @param filter The new filter to add
     * @returns Details of process filter just added
     */
    addFilter(filter: ProcessFilterCloudModel) {
        const user: IdentityUserModel = this.identityUserService.getCurrentUserInfo();
        const key = `process-filters-${filter.appName}-${user.username}`;
        const storedFilters = JSON.parse(this.storage.getItem(key) || '[]');

        storedFilters.push(filter);
        this.storage.setItem(key, JSON.stringify(storedFilters));

        this.addFiltersToStream(storedFilters);
    }

 /**
  *  Update process instance filter
  * @param filter The new filter to update
  */
 updateFilter(filter: ProcessFilterCloudModel) {
     const user: IdentityUserModel = this.identityUserService.getCurrentUserInfo();
     const key = `process-filters-${filter.appName}-${user.username}`;
     if (key) {
         let filters = JSON.parse(this.storage.getItem(key) || '[]');
         let itemIndex = filters.findIndex((flt: ProcessFilterCloudModel) => flt.id === filter.id);
         filters[itemIndex] = filter;
         this.storage.setItem(key, JSON.stringify(filters));
         this.addFiltersToStream(filters);
     }
 }

    /**
     * Gets all process instance filters for a process app.
     * @param appName Name of the target app
     * @returns Observable of process filter details
     */
    getProcessFilters(appName: string): Observable<ProcessFilterCloudModel[]> {
        const user: IdentityUserModel = this.identityUserService.getCurrentUserInfo();
        const key = `process-filters-${appName}-${user.username}`;
        const filters = JSON.parse(this.storage.getItem(key) || '[]');

        if (filters.length === 0) {
            this.createDefaultFilters(appName);
        } else {
            this.addFiltersToStream(filters);
        }
        return this.filters$;
    }

 /**
  *  Delete process instance filter
  * @param filter The new filter to delete
  */
 deleteFilter(filter: ProcessFilterCloudModel) {
     const user: IdentityUserModel = this.identityUserService.getCurrentUserInfo();
     const key = `process-filters-${filter.appName}-${user.username}`;
     if (key) {
         let filters = JSON.parse(this.storage.getItem(key) || '[]');
         filters = filters.filter((item) => item.id !== filter.id);
         this.storage.setItem(key, JSON.stringify(filters));
         if (filters.length === 0) {
             this.createDefaultFilters(filter.appName);
         } else {
             this.addFiltersToStream(filters);
         }
     }
 }