import expect from 'app/test/unexpected';
import sinon from 'sinon';

import AuthFlow from 'app/services/authFlow/AuthFlow';
import AbstractState from 'app/services/authFlow/AbstractState';
import localStorage from 'app/services/localStorage';

import OAuthState from 'app/services/authFlow/OAuthState';
import RegisterState from 'app/services/authFlow/RegisterState';
import RecoverPasswordState from 'app/services/authFlow/RecoverPasswordState';
import ForgotPasswordState from 'app/services/authFlow/ForgotPasswordState';
import ActivationState from 'app/services/authFlow/ActivationState';
import ResendActivationState from 'app/services/authFlow/ResendActivationState';
import LoginState from 'app/services/authFlow/LoginState';
import CompleteState from 'app/services/authFlow/CompleteState';
import ChooseAccountState from 'app/services/authFlow/ChooseAccountState';

describe('AuthFlow', () => {
  let flow;
  let actions;

  beforeEach(() => {
    actions = {
      test: sinon.stub().named('actions.test'),
    };
    actions.test.returns('passed');

    flow = new AuthFlow(actions);
  });

  it('throws when no actions provided', () => {
    expect(
      // @ts-ignore
      () => new AuthFlow(),
      'to throw',
      'AuthFlow requires an actions object',
    );
  });

  it('should not allow to mutate actions', () => {
    expect(
      () => (flow.actions.foo = 'bar'),
      'to throw',
      /readonly|not extensible/,
    );
    expect(() => (flow.actions.test = 'hacked'), 'to throw', /read ?only/);
  });

  describe('#setStore', () => {
    it('should create #navigate, #getState, #dispatch', () => {
      flow.setStore({
        getState() {},
        dispatch() {},
      });

      expect(flow.getState, 'to be defined');
      expect(flow.dispatch, 'to be defined');
      expect(flow.navigate, 'to be defined');
    });
  });

  describe('#restoreOAuthState', () => {
    let oauthData;

    beforeEach(() => {
      oauthData = { foo: 'bar' };
      localStorage.setItem(
        'oauthData',
        JSON.stringify({
          timestamp: Date.now() - 10,
          payload: oauthData,
        }),
      );

      sinon.stub(flow, 'run').named('flow.run');
      const promiseLike = { then: fn => fn() || promiseLike };
      flow.run.returns(promiseLike);
      sinon.stub(flow, 'setState').named('flow.setState');
    });

    afterEach(() => {
      localStorage.removeItem('oauthData');
    });

    it('should call to restoreOAuthState', () => {
      sinon.stub(flow, 'restoreOAuthState').named('flow.restoreOAuthState');

      flow.handleRequest({ path: '/' });

      expect(flow.restoreOAuthState, 'was called');
    });

    it('should restore oauth state from localStorage', () => {
      flow.handleRequest({ path: '/' });

      expect(flow.run, 'to have a call satisfying', [
        'oAuthValidate',
        oauthData,
      ]);
    });

    it('should transition to CompleteState', () => {
      flow.handleRequest({ path: '/' });

      expect(flow.setState, 'to have a call satisfying', [
        expect.it('to be a', CompleteState),
      ]);
    });

    it('should not handle current request', () => {
      flow.handleRequest({ path: '/' });

      expect(flow.setState, 'was called once');
    });

    it('should call onReady after state restoration', () => {
      const onReady = sinon.stub().named('onReady');

      flow.handleRequest({ path: '/login' }, null, onReady);

      expect(onReady, 'was called');
    });

    it('should not restore oauth state for /register route', () => {
      flow.handleRequest({ path: '/register' });

      expect(flow.run, 'was not called'); // this.run('oAuthValidate'...
    });

    it('should not restore outdated (>1h) oauth state', () => {
      localStorage.setItem(
        'oauthData',
        JSON.stringify({
          timestamp: Date.now() - 2 * 60 * 60 * 1000,
          payload: oauthData,
        }),
      );

      flow.handleRequest({ path: '/' });

      expect(flow.run, 'was not called');
    });
  });

  describe('#setState', () => {
    it('should change state', () => {
      const state = new AbstractState();
      flow.setState(state);

      expect(flow.state, 'to be', state);
    });

    it('should call #enter() on new state and pass reference to itself', () => {
      const state = new AbstractState();
      const spy = sinon.spy(state, 'enter').named('state.enter');

      flow.setState(state);

      expect(spy, 'was called once');
      expect(spy, 'to have a call satisfying', [flow]);
    });

    it('should call `leave` on previous state if any', () => {
      class State1 extends AbstractState {}
      class State2 extends AbstractState {}

      const state1 = new State1();
      const state2 = new State2();
      const spy1 = sinon.spy(state1, 'leave');
      const spy2 = sinon.spy(state2, 'leave');

      flow.setState(state1);
      flow.setState(state2);

      expect(spy1, 'was called once');
      expect(spy1, 'to have a call satisfying', [flow]);
      expect(spy2, 'was not called');
    });

    it('should return promise, if #enter returns it', () => {
      const state = new AbstractState();
      const expected = Promise.resolve();

      state.enter = () => expected;

      const actual = flow.setState(state);

      expect(actual, 'to be', expected);
    });

    it('should throw if no state', () => {
      expect(() => flow.setState(), 'to throw', 'State is required');
    });
  });

  describe('#run', () => {
    let store;

    beforeEach(() => {
      store = {
        getState() {},
        dispatch: sinon.stub().named('store.dispatch'),
      };

      flow.setStore(store);
    });

    it('should dispatch an action', () => {
      flow.run('test');

      expect(store.dispatch, 'was called once');
      expect(store.dispatch, 'to have a call satisfying', ['passed']);
    });

    it('should dispatch an action with payload given', () => {
      flow.run('test', 'arg');

      expect(actions.test, 'was called once');
      expect(actions.test, 'to have a call satisfying', ['arg']);
    });

    it('should resolve to action dispatch result', () => {
      const expected = 'dispatch called';
      store.dispatch.returns(expected);

      return expect(flow.run('test'), 'to be fulfilled with', expected);
    });

    it('throws when running unexisted action', () => {
      expect(() => flow.run('123'), 'to throw', 'Action 123 does not exists');
    });
  });

  describe('#goBack', () => {
    it('should call goBack on state passing itself as argument', () => {
      const state = new AbstractState();
      sinon.stub(state, 'goBack').named('state.goBack');
      flow.setState(state);

      flow.goBack();

      expect(state.goBack, 'was called once');
      expect(state.goBack, 'to have a call satisfying', [flow]);
    });
  });

  describe('#resolve', () => {
    it('should call resolve on state passing itself and payload as arguments', () => {
      const state = new AbstractState();
      sinon.stub(state, 'resolve').named('state.resolve');
      flow.setState(state);

      const expectedPayload = { foo: 'bar' };

      flow.resolve(expectedPayload);

      expect(state.resolve, 'was called once');
      expect(state.resolve, 'to have a call satisfying', [
        flow,
        expectedPayload,
      ]);
    });
  });

  describe('#reject', () => {
    it('should call reject on state passing itself and payload as arguments', () => {
      const state = new AbstractState();
      sinon.stub(state, 'reject').named('state.reject');
      flow.setState(state);

      const expectedPayload = { foo: 'bar' };

      flow.reject(expectedPayload);

      expect(state.reject, 'was called once');
      expect(state.reject, 'to have a call satisfying', [
        flow,
        expectedPayload,
      ]);
    });
  });

  describe('#handleRequest()', () => {
    beforeEach(() => {
      sinon.stub(flow, 'setState').named('flow.setState');
      sinon.stub(flow, 'run').named('flow.run');
    });

    Object.entries({
      '/': LoginState,
      '/login': LoginState,
      '/password': LoginState,
      '/accept-rules': LoginState,
      '/oauth/permissions': LoginState,
      '/oauth/choose-account': LoginState,
      '/oauth/finish': LoginState,
      '/oauth2/v1/foo': OAuthState,
      '/oauth2/v1': OAuthState,
      '/oauth2': OAuthState,
      '/register': RegisterState,
      '/choose-account': ChooseAccountState,
      '/recover-password': RecoverPasswordState,
      '/recover-password/key123': RecoverPasswordState,
      '/forgot-password': ForgotPasswordState,
      '/activation': ActivationState,
      '/resend-activation': ResendActivationState,
    }).forEach(([path, type]) => {
      it(`should transition to ${type.name} if ${path}`, () => {
        flow.handleRequest({ path });

        expect(flow.setState, 'was called once');
        expect(flow.setState, 'to have a call satisfying', [
          expect.it('to be a', type),
        ]);
      });
    });

    it('should call callback', () => {
      const callback = sinon.stub().named('callback');

      flow.handleRequest({ path: '/' }, () => {}, callback);

      expect(callback, 'was called once');
    });

    it('should not call callback till returned from #enter() promise will be resolved', () => {
      let resolve;
      const promise = {
        then: cb => {
          resolve = cb;
        },
      };
      const callback = sinon.stub().named('callback');

      const state = new AbstractState();
      state.enter = () => promise;

      flow.setState = AuthFlow.prototype.setState.bind(flow, state);

      flow.handleRequest({ path: '/' }, () => {}, callback);

      expect(resolve, 'to be', callback);

      expect(callback, 'was not called');
      resolve();
      expect(callback, 'was called once');
    });

    it('should not handle the same request twice', () => {
      const path = '/oauth2';
      const callback = sinon.stub();

      flow.handleRequest({ path }, () => {}, callback);
      flow.handleRequest({ path }, () => {}, callback);

      expect(flow.setState, 'was called once');
      expect(flow.setState, 'to have a call satisfying', [
        expect.it('to be a', OAuthState),
      ]);
      expect(callback, 'was called twice');
    });

    it('throws if unsupported request', () => {
      const replace = sinon.stub().named('replace');

      flow.handleRequest({ path: '/foo/bar' }, replace);

      expect(replace, 'to have a call satisfying', ['/404']);
    });
  });

  describe('#getRequest()', () => {
    beforeEach(() => {
      sinon.stub(flow, 'setState').named('flow.setState');
      sinon.stub(flow, 'run').named('flow.run');
    });

    it('should return request with path, query, params', () => {
      const request = { path: '/' };

      flow.handleRequest(request);

      expect(flow.getRequest(), 'to satisfy', {
        ...request,
        query: expect.it('to be an', URLSearchParams),
        params: {},
      });
    });

    it('should return a copy of current request', () => {
      const request = {
        path: '/',
        query: { foo: 'bar' },
        params: { baz: 'bud' },
      };

      flow.handleRequest(request);

      expect(flow.getRequest(), 'to equal', request);
      expect(flow.getRequest(), 'not to be', request);
    });
  });
});