Add task related files

README.md

@@ -1,5 +1,18 @@
 # HierarchyTask
 
+Implement functions `findMeterWithId` and `getHierarchyWithoutMeter` in file `src/app/services/meter-hierarchy-helpers.ts`.
+Don't modify any other files.
+
+Functions are considered implemented when tests pass. Tests can be run with command `ng test`.
+Try to make solution clean and efficient.
+
+Required software:
+- nodejs v16 or newer
+- npm
+- angular CLI (can be installed with command `npm -g i @angular/cli`)
+
+-- TEXT BELOW IS AUTOMATICALLY GENERATED BY ANGULAR CLI
+
 This project was generated with [Angular CLI](https://github.com/angular/angular-cli) version 13.1.2.
 
 ## Development server

src/app/meter.ts

@@ -0,0 +1,6 @@
+export interface Meter {
+  id: number;
+  facilityId: number;
+  name: string;
+  subMeters?: Meter[];
+}

src/app/services/meter-hiearchy-helpers.spec.ts

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+import * as helpers from './meter-hiearchy-helpers';
+import { Meter } from '../meter';
+
+describe('MeterHierarchyHelpers', () => {
+  let hierarchy: Meter[];
+
+  beforeEach(() => {
+    hierarchy = helpers.getExampleHierarchy();
+  });
+
+  describe('#findMeterWithId', () => {
+    it('should find meter from top level', () => {
+      expect(helpers.findMeterWithId(hierarchy, 9)).toEqual({
+        id: 9, facilityId: 101, name: 'm 8'
+      });
+    });
+
+    it('should find meter recursively', () => {
+      expect(helpers.findMeterWithId(hierarchy, 46)).toEqual({
+        id: 46, name: 'meter46', facilityId: 88
+      });
+    });
+
+    it('should return null when meter is not found', () => {
+      expect(helpers.findMeterWithId(hierarchy, 987)).toBeNull();
+    });
+  });
+
+  describe('#getHierarchyWithoutMeter', () => {
+    it('should remove meter without submeters', () => {
+      const expectedHierarchy: Meter[] = [
+        {
+          id: 5,
+          facilityId: 4,
+          name: 'mittari 5',
+          subMeters: [
+            { id: 12, name: 'Meter 12', facilityId: 4 },
+            { id: 13, name: 'Meter 13', facilityId: 4 }
+          ]
+        },
+        {
+          id: 11,
+          facilityId: 88,
+          name: 'meter11',
+          subMeters: [
+            {
+              id: 33,
+              name: 'M33',
+              facilityId: 88,
+              subMeters: [
+                { id: 45, name: 'meter45', facilityId: 88 },
+                { id: 46, name: 'meter46', facilityId: 88 },
+                { id: 48, name: 'meter48', facilityId: 88 }
+              ]
+            }
+          ]
+        },
+        {
+          id: 55,
+          name: 'Mittari 55',
+          facilityId: 400
+        }
+      ];
+
+      expect(helpers.getHierarchyWithoutMeter(hierarchy, 9)).toEqual(expectedHierarchy);
+    });
+
+    it('should remove meter and its submeters', () => {
+      const expectedHierarchy: Meter[] = [
+        {
+          id: 5,
+          facilityId: 4,
+          name: 'mittari 5',
+          subMeters: [
+            { id: 12, name: 'Meter 12', facilityId: 4 },
+            { id: 13, name: 'Meter 13', facilityId: 4 }
+          ]
+        },
+        {
+          id: 9,
+          facilityId: 101,
+          name: 'm 8'
+        },
+        {
+          id: 55,
+          name: 'Mittari 55',
+          facilityId: 400
+        }
+      ];
+
+      expect(helpers.getHierarchyWithoutMeter(hierarchy, 11)).toEqual(expectedHierarchy);
+    });
+
+    it('should remove submeter only', () => {
+      const expectedHierarchy: Meter[] = [
+        {
+          id: 5,
+          facilityId: 4,
+          name: 'mittari 5',
+          subMeters: [
+            { id: 13, name: 'Meter 13', facilityId: 4 }
+          ]
+        },
+        {
+          id: 9,
+          facilityId: 101,
+          name: 'm 8'
+        },
+        {
+          id: 11,
+          facilityId: 88,
+          name: 'meter11',
+          subMeters: [
+            {
+              id: 33,
+              name: 'M33',
+              facilityId: 88,
+              subMeters: [
+                { id: 45, name: 'meter45', facilityId: 88 },
+                { id: 46, name: 'meter46', facilityId: 88 },
+                { id: 48, name: 'meter48', facilityId: 88 }
+              ]
+            }
+          ]
+        },
+        {
+          id: 55,
+          name: 'Mittari 55',
+          facilityId: 400
+        }
+      ];
+
+      expect(helpers.getHierarchyWithoutMeter(hierarchy, 12)).toEqual(expectedHierarchy);
+    });
+  });
+
+  afterEach(() => {
+    // Check that operations did not have side effects
+    expect(hierarchy).toEqual(helpers.getExampleHierarchy());
+  });
+});

src/app/services/meter-hiearchy-helpers.ts

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+import { Meter } from '../meter';
+
+/**
+ * Find meter with given id from hierarchy
+ *
+ * @returns meter object or null if meter with given id is not found
+ */
+export function findMeterWithId(hierarchy: Meter[], id: number): Meter | null {
+  throw Error('Implement this');
+}
+
+/**
+ * Get new hierarchy from which meter with given id (and possible submeters) is deleted
+ *
+ * @returns hierarchy without meter with given id
+ */
+export function getHierarchyWithoutMeter(hierarchy: Meter[], id: number): Meter[] {
+  throw Error('Implement this');
+}
+
+export function getExampleHierarchy(): Meter[] {
+  return [
+    {
+      id: 5,
+      facilityId: 4,
+      name: 'mittari 5',
+      subMeters: [
+        { id: 12, name: 'Meter 12', facilityId: 4 },
+        { id: 13, name: 'Meter 13', facilityId: 4 }
+      ]
+    },
+    {
+      id: 9,
+      facilityId: 101,
+      name: 'm 8'
+    },
+    {
+      id: 11,
+      facilityId: 88,
+      name: 'meter11',
+      subMeters: [
+        {
+          id: 33,
+          name: 'M33',
+          facilityId: 88,
+          subMeters: [
+            { id: 45, name: 'meter45', facilityId: 88 },
+            { id: 46, name: 'meter46', facilityId: 88 },
+            { id: 48, name: 'meter48', facilityId: 88 }
+          ]
+        }
+      ]
+    },
+    {
+      id: 55,
+      name: 'Mittari 55',
+      facilityId: 400
+    }
+  ];
+}