/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

import {ɵMetadataOverrider as MetadataOverrider} from '@angular/core/testing';
import {expect} from '@angular/platform-browser/testing/src/matchers';

interface SomeMetadataType {
  plainProp?: string;
  getterProp?: string;
  arrayProp?: any[];
}

interface OtherMetadataType extends SomeMetadataType {
  otherPlainProp?: string;
}

class SomeMetadata implements SomeMetadataType {
  plainProp: string;
  private _getterProp: string;
  arrayProp: any[];

  constructor(options: SomeMetadataType) {
    this.plainProp = options.plainProp!;
    this._getterProp = options.getterProp!;
    this.arrayProp = options.arrayProp!;
    Object.defineProperty(this, 'getterProp', {
      enumerable: true, // getters are non-enumerable by default in es2015
      get: () => this._getterProp,
    });
  }
}

class OtherMetadata extends SomeMetadata implements OtherMetadataType {
  otherPlainProp: string;

  constructor(options: OtherMetadataType) {
    super({
      plainProp: options.plainProp,
      getterProp: options.getterProp,
      arrayProp: options.arrayProp,
    });

    this.otherPlainProp = options.otherPlainProp!;
  }
}

describe('metadata overrider', () => {
  let overrider: MetadataOverrider;

  beforeEach(() => {
    overrider = new MetadataOverrider();
  });

  it('should return a new instance with the same values', () => {
    const oldInstance = new SomeMetadata({plainProp: 'somePlainProp', getterProp: 'someInput'});
    const newInstance = overrider.overrideMetadata(SomeMetadata, oldInstance, {});
    expect(newInstance).not.toBe(oldInstance);
    expect(newInstance).toBeInstanceOf(SomeMetadata);
    expect(newInstance).toEqual(oldInstance);
  });

  it('should set individual properties and keep others', () => {
    const oldInstance = new SomeMetadata({
      plainProp: 'somePlainProp',
      getterProp: 'someGetterProp',
    });
    const newInstance = overrider.overrideMetadata(SomeMetadata, oldInstance, {
      set: {plainProp: 'newPlainProp'},
    });
    expect(newInstance).toEqual(
      new SomeMetadata({plainProp: 'newPlainProp', getterProp: 'someGetterProp'}),
    );
  });

  describe('add properties', () => {
    it('should replace non array values', () => {
      const oldInstance = new SomeMetadata({
        plainProp: 'somePlainProp',
        getterProp: 'someGetterProp',
      });
      const newInstance = overrider.overrideMetadata(SomeMetadata, oldInstance, {
        add: {plainProp: 'newPlainProp'},
      });
      expect(newInstance).toEqual(
        new SomeMetadata({plainProp: 'newPlainProp', getterProp: 'someGetterProp'}),
      );
    });

    it('should add to array values', () => {
      const oldInstance = new SomeMetadata({arrayProp: ['a']});
      const newInstance = overrider.overrideMetadata(SomeMetadata, oldInstance, {
        add: {arrayProp: ['b']},
      });
      expect(newInstance).toEqual(new SomeMetadata({arrayProp: ['a', 'b']}));
    });
  });

  describe('remove', () => {
    it('should set values to undefined if their value matches', () => {
      const oldInstance = new SomeMetadata({
        plainProp: 'somePlainProp',
        getterProp: 'someGetterProp',
      });
      const newInstance = overrider.overrideMetadata(SomeMetadata, oldInstance, {
        remove: {plainProp: 'somePlainProp'},
      });
      expect(newInstance).toEqual(
        new SomeMetadata({plainProp: undefined, getterProp: 'someGetterProp'}),
      );
    });

    it('should leave values if their value does not match', () => {
      const oldInstance = new SomeMetadata({
        plainProp: 'somePlainProp',
        getterProp: 'someGetterProp',
      });
      const newInstance = overrider.overrideMetadata(SomeMetadata, oldInstance, {
        remove: {plainProp: 'newPlainProp'},
      });
      expect(newInstance).toEqual(
        new SomeMetadata({plainProp: 'somePlainProp', getterProp: 'someGetterProp'}),
      );
    });

    it('should remove a value from an array', () => {
      const oldInstance = new SomeMetadata({
        arrayProp: ['a', 'b', 'c'],
        getterProp: 'someGetterProp',
      });
      const newInstance = overrider.overrideMetadata(SomeMetadata, oldInstance, {
        remove: {arrayProp: ['a', 'c']},
      });
      expect(newInstance).toEqual(
        new SomeMetadata({arrayProp: ['b'], getterProp: 'someGetterProp'}),
      );
    });

    it('should support types as values', () => {
      class Class1 {}
      class Class2 {}
      class Class3 {}

      const instance1 = new SomeMetadata({arrayProp: [Class1, Class2, Class3]});
      const instance2 = overrider.overrideMetadata(SomeMetadata, instance1, {
        remove: {arrayProp: [Class1]},
      });
      expect(instance2).toEqual(new SomeMetadata({arrayProp: [Class2, Class3]}));
      const instance3 = overrider.overrideMetadata(SomeMetadata, instance2, {
        remove: {arrayProp: [Class3]},
      });
      expect(instance3).toEqual(new SomeMetadata({arrayProp: [Class2]}));
    });
  });

  describe('subclasses', () => {
    it('should set individual properties and keep others', () => {
      const oldInstance = new OtherMetadata({
        plainProp: 'somePlainProp',
        getterProp: 'someGetterProp',
        otherPlainProp: 'newOtherProp',
      });
      const newInstance = overrider.overrideMetadata(OtherMetadata, oldInstance, {
        set: {plainProp: 'newPlainProp'},
      });
      expect(newInstance).toEqual(
        new OtherMetadata({
          plainProp: 'newPlainProp',
          getterProp: 'someGetterProp',
          otherPlainProp: 'newOtherProp',
        }),
      );
    });
  });
});