/*
 * Copyright (C) 2018, 2019 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
import {TestBed} from '@angular/core/testing';
import {Client} from '@openstapps/api/lib/client';
import {SCDish, SCMessage, SCSaveableThing, SCSearchQuery,
  SCSearchResponse, SCSearchValueFilter, SCThing, SCThingOriginType, SCThings, SCThingType} from '@openstapps/core';
import {sampleThingsMap} from '../../_helpers/data/sampleThings';
import {StorageProvider} from '../storage/storage.provider';
import {DataModule} from './data.module';
import {DataProvider, DataScope} from './data.provider';
import {StAppsWebHttpClient} from './stapps-web-http-client.provider';

describe('DataProvider', () => {
  let dataProvider: DataProvider;
  let storageProvider: StorageProvider;
  const sampleThing: SCMessage = sampleThingsMap.message[0] as SCMessage;
  const sampleResponse: SCSearchResponse = {
    data: sampleThingsMap.dish as SCDish[],
    facets: [
      {
        buckets: [],
        field: 'foo',
      },
    ],
    pagination: {
      count: 0,
      offset: 0,
      total: 0,
    },
    stats: {
      time: 123,
    },
  };
  const sampleFilter: SCSearchValueFilter = {
    arguments: {
      field: 'type',
      value: 'dish',
    },
    type: 'value',
  };
  const sampleQuery: SCSearchQuery = {
    filter: sampleFilter,
  };

  const sampleSavable: SCSaveableThing<SCThings> = {
    data: sampleThing,
    name: sampleThing.name,
    origin: {
      created: new Date().toISOString(),
      type: SCThingOriginType.User,
    },
    type: SCThingType.Message,
    uid: sampleThing.uid,
  };
  const otherSampleThing: SCMessage = {...sampleThing, uid: 'message-456', name: 'bar'};

  beforeEach(async () => {
    TestBed.configureTestingModule({
      imports: [DataModule],
      providers: [
        DataProvider,
        StAppsWebHttpClient,
      ],
    });
    storageProvider = TestBed.get(StorageProvider);
    dataProvider = TestBed.get(DataProvider);
    await storageProvider.deleteAll();
  });

  it('should generate data key', async () => {
    dataProvider.storagePrefix = 'foo.data';
    expect(dataProvider.getDataKey('123')).toBe('foo.data.123');
  });

  it('should provide backend data items using search query', async () => {
    spyOn(Client.prototype, 'search').and.callFake(() => {
      return {
        then: (callback: any) => {
          return callback(sampleResponse);
        },
      };
    });
    const response = await dataProvider.search(sampleQuery);
    expect(response).toEqual(sampleResponse);
  });

  it('should put an data item into the local database (storage)', async () => {
    let providedThing: SCSaveableThing<SCThing>;
    spyOn(storageProvider, 'put').and.callFake((_id: any, thing: any) => {
      providedThing = thing;
      providedThing.origin.created = sampleSavable.origin.created;
    });
    expect(storageProvider.put).not.toHaveBeenCalled();
    expect(providedThing!).not.toBeDefined();
    await dataProvider.put(sampleThing);
    expect(providedThing!).toBeDefined();
    expect(providedThing!).toEqual(sampleSavable);
  });

  it('should correctly set and get single data item from the local database (storage)', async () => {
    await dataProvider.put(sampleThing);
    spyOn(storageProvider, 'get').and.callThrough();
    expect(storageProvider.get).not.toHaveBeenCalled();
    const providedThing = await dataProvider.get(sampleThing.uid, DataScope.Local);
    providedThing.origin.created = sampleSavable.origin.created;
    expect(storageProvider.get).toHaveBeenCalledWith(dataProvider.getDataKey(sampleThing.uid));
    expect(providedThing).toEqual(sampleSavable);
  });

  it('should provide all data items from the local database (storage)', async () => {
    await dataProvider.put(sampleThing);
    await dataProvider.put(otherSampleThing);
    const result = await dataProvider.getAll();
    expect(Array.from(result.keys()).sort()).toEqual([
      dataProvider.getDataKey(sampleThing.uid), dataProvider.getDataKey(otherSampleThing.uid),
    ]);
    expect(result.get(dataProvider.getDataKey(sampleThing.uid))!.data).toEqual(sampleThing);
    expect(result.get(dataProvider.getDataKey(otherSampleThing.uid))!.data).toEqual(otherSampleThing);
  });

  it('should provide single data from the backend', async () => {
    spyOn(Client.prototype, 'getThing').and.callFake(() => {
      return {
        then: (callback: any) => {
          return callback(sampleThing);
        },
      };
    });
    expect(Client.prototype.getThing).not.toHaveBeenCalled();
    const providedThing = await dataProvider.get(sampleThing.uid, DataScope.Remote);
    expect(Client.prototype.getThing).toHaveBeenCalledWith(sampleThing.uid);
    expect(providedThing).toBe(sampleThing);
  });

  it('should get an item from both local and remote database', async () => {
    spyOn(Client.prototype, 'getThing').and.callFake(() => {
      return {
        then: (callback: any) => {
          return callback(sampleThing);
        },
      };
    });
    spyOn(storageProvider, 'get').and.callFake(() => {
      return {
        then: (callback: any) => {
          return callback(sampleSavable);
        },
      };
    });
    const result = await dataProvider.get(sampleThing.uid);
    expect(result.get(DataScope.Local)).toEqual(sampleSavable);
    expect(result.get(DataScope.Remote)).toEqual(sampleThing);
  });

  it('should properly delete a data item from the local database (storage)', async () => {
    spyOn(storageProvider, 'delete').and.callThrough();
    await dataProvider.put(sampleThing);
    expect(await storageProvider.length()).toBe(1);
    await dataProvider.delete(sampleThing.uid);
    expect(storageProvider.delete).toHaveBeenCalledWith(dataProvider.getDataKey(sampleThing.uid));
    expect(await storageProvider.length()).toBe(0);
  });

  it('should properly delete all the data items from the local database (storage)', async () => {
    spyOn(storageProvider, 'delete').and.callThrough();
    await dataProvider.put(sampleThing);
    await dataProvider.put(otherSampleThing);
    await storageProvider.put('some-uid', {some: 'thing'});
    expect(await storageProvider.length()).toBe(3);
    await dataProvider.deleteAll();
    expect(storageProvider.delete).toHaveBeenCalledWith(
      dataProvider.getDataKey(sampleThing.uid),
      dataProvider.getDataKey(otherSampleThing.uid),
    );
    const result = await storageProvider.getAll();
    expect(Array.from(result.keys())).toEqual(['some-uid']);
  });

  it('should properly check if a data item has already been saved', async () => {
    expect(await dataProvider.isSaved(sampleThing.uid)).toBeFalsy();
    await dataProvider.put(sampleThing);
    expect(await dataProvider.isSaved(sampleThing.uid)).toBeTruthy();
  });
});