import { MemoizedSelector } from '@ngrx/store';
import { coreSelector, CoreState } from '../core.reducers';
import { JsonPatchOperationsEntry, JsonPatchOperationsResourceEntry } from './json-patch-operations.reducer';
import { keySelector, subStateSelector } from '../../submission/selectors';

/**
 * Return MemoizedSelector to select all jsonPatchOperations for a specified resource type, stored in the state
 *
 * @param resourceType
 *    the resource type
 * @return MemoizedSelector<CoreState, JsonPatchOperationsResourceEntry>
 *     MemoizedSelector
 */
export function jsonPatchOperationsByResourceType(resourceType: string): MemoizedSelector<CoreState, JsonPatchOperationsResourceEntry> {
  return keySelector<CoreState, JsonPatchOperationsResourceEntry>(coreSelector,'json/patch', resourceType);
}

/**
 * Return MemoizedSelector to select all jsonPatchOperations for a specified resource id, stored in the state
 *
 * @param resourceType
 *    the resource type
 * @param resourceId
 *    the resourceId type
 * @return MemoizedSelector<CoreState, JsonPatchOperationsResourceEntry>
 *     MemoizedSelector
 */
export function jsonPatchOperationsByResourceId(resourceType: string, resourceId: string): MemoizedSelector<CoreState, JsonPatchOperationsEntry> {
  const resourceTypeSelector  = jsonPatchOperationsByResourceType(resourceType);
  return subStateSelector<CoreState, JsonPatchOperationsEntry>(resourceTypeSelector, resourceId);
}