/* eslint-disable no-console */
import path from 'path';
import tape from 'tape-catch';
import sinon from 'sinon';
import fetchMock from '../testUtils/nodeFetchMock';
import { url } from '../testUtils';
import { SplitFactory } from '../../';
import { settingsFactory } from '../../settings';

const settings = settingsFactory({ core: { key: 'facundo@split.io' } });

const spySplitChanges = sinon.spy();
const spySegmentChanges = sinon.spy();
const spyMemberships = sinon.spy();
const spyEventsBulk = sinon.spy();
const spyTestImpressionsBulk = sinon.spy();
const spyTestImpressionsCount = sinon.spy();
const spyMetricsTimes = sinon.spy();
const spyMetricsCounters = sinon.spy();
const spyAny = sinon.spy();

// helper function that should call the spy function and return a 200 to keep
// going the fetch request flow
const replySpy = spy => {
  spy();
  return 200;
};

const configMocks = () => {
  fetchMock.mock(new RegExp(`${url(settings, '/splitChanges/')}.*`), () => replySpy(spySplitChanges));
  fetchMock.mock(new RegExp(`${url(settings, '/segmentChanges/')}.*`), () => replySpy(spySegmentChanges));
  fetchMock.mock(new RegExp(`${url(settings, '/memberships/')}.*`), () => replySpy(spyMemberships));
  fetchMock.mock(url(settings, '/events/bulk'), () => replySpy(spyEventsBulk));
  fetchMock.mock(url(settings, '/testImpressions/bulk'), () => replySpy(spyTestImpressionsBulk));
  fetchMock.mock(url(settings, '/testImpressions/count'), () => replySpy(spyTestImpressionsCount));
  fetchMock.mock('*', () => replySpy(spyAny));
};

const settingsGenerator = mockFileName => {
  return {
    core: {
      authorizationKey: 'localhost'
    },
    scheduler: {
      impressionsRefreshRate: 0.01,
      eventsPushRate: 0.01,
      offlineRefreshRate: 0.3
    },
    startup: {
      readyTimeout: 3,
      retriesOnFailureBeforeReady: 0
    },
    features: path.join(__dirname, mockFileName)
  };
};


tape('Node.js Offline Mode', function (t) {

  t.test('Old format evaluations - .split', DotSplitTests);
  t.test('New format evaluations - .yaml extension', DotYAMLTests.bind(null, 'split', 'yaml'));
  t.test('New format evaluations - .yml extension', DotYAMLTests.bind(null, 'split2', 'yml'));

  t.test('Old format manager - .split extension', ManagerDotSplitTests);
  t.test('New format manager - .yaml extension', ManagerDotYamlTests.bind(null, 'split.yaml'));
  t.test('New format manager - .yml extension', ManagerDotYamlTests.bind(null, 'split2.yml'));

  t.test('Evaluations and manager with multiple SDK instances', MultipleInstancesTests);

  t.test('Trying to specify an invalid extension it will timeout', assert => {
    const config = settingsGenerator('.forbidden');

    sinon.stub(console, 'error');
    sinon.stub(console, 'warn');
    sinon.stub(console, 'info');
    sinon.stub(console, 'debug');

    const factory = SplitFactory({
      ...config,
      core: {
        ...config.core,
        key: 'ignored' // just set to log a warning
      },
      debug: 'INFO', // enable logs to check the message.
      logger: console // use console as custom logger.
    });
    const client = factory.client();

    client.on(client.Event.SDK_READY, () => {
      assert.fail('If tried to load a file with invalid extension, we should not get SDK_READY.');

      client.destroy();
      assert.end();
    });
    client.on(client.Event.SDK_READY_TIMED_OUT, () => {
      assert.pass('If tried to load a file with invalid extension, we should emit SDK_READY_TIMED_OUT.');

      assert.ok(console.error.calledWithMatch(`splitio => sync:offline: There was an issue loading the mock feature flags data. No changes will be applied to the current cache. Error: Invalid extension specified for feature flags mock file. Accepted extensions are ".yml" and ".yaml". Your specified file is ${config.features}`));
      assert.ok(console.warn.calledWithMatch('splitio => Provided `key` is ignored in server-side SDK.'));
      assert.ok(console.info.called, 'info should be called');
      assert.notOk(console.debug.called, 'debug should not be called');

      console.error.restore();
      console.warn.restore();
      console.info.restore();
      console.debug.restore();
      client.destroy();
      assert.end();
    });
  });
});

function networkAssertions(client, assert) {
  return client.destroy().then(() => {
    // We test the breakdown instead of just the misc because it's faster to spot where the issue is
    assert.notOk(spySplitChanges.called, 'On offline mode we should not call the splitChanges endpoint.');
    assert.notOk(spySegmentChanges.called, 'On offline mode we should not call the segmentChanges endpoint.');
    assert.notOk(spyMemberships.called, 'On offline mode we should not call the memberships endpoint.');
    assert.notOk(spyEventsBulk.called, 'On offline mode we should not call the events endpoint.');
    assert.notOk(spyTestImpressionsBulk.called, 'On offline mode we should not call the impressions endpoint.');
    assert.notOk(spyTestImpressionsCount.called, 'On offline mode we should not call the impressions count endpoint.');
    assert.notOk(spyMetricsTimes.called, 'On offline mode we should not call the metric times endpoint.');
    assert.notOk(spyMetricsCounters.called, 'On offline mode we should not call the metric counters endpoint.');
    assert.notOk(spyAny.called, 'On offline mode we should NOT call to ANY endpoint, we are completely isolated from BE.');
  });
}

function DotSplitTests(assert) {
  configMocks();
  const config = settingsGenerator('.split');
  const factory = SplitFactory(config);
  const client = factory.client();
  // Tracking some events to test they are not flushed.
  client.track('a_key', 'a_tt', 'an_ev_id');
  client.track('another_key', 'another_tt', 'another_ev_id', 25);

  client.on(client.Event.SDK_READY, function () {
    assert.equal(client.getTreatment('qa-user', 'testing_split'), 'on');
    assert.equal(client.getTreatment('qa-user', 'testing_split_2'), 'control');
    assert.deepEqual(client.getTreatmentWithConfig('qa-user', 'testing_split'), { treatment: 'on', config: null });
    assert.deepEqual(client.getTreatmentWithConfig('qa-user', 'testing_split_2'), { treatment: 'control', config: null });

    assert.deepEqual(client.getTreatments('qa-user', [
      'testing_split',
      'testing_split2',
      'testing_split3',
      'testing_not_exist'
    ]), {
      testing_split: 'on',
      testing_split2: 'off',
      testing_split3: 'custom_treatment',
      testing_not_exist: 'control'
    });
    assert.deepEqual(client.getTreatmentsWithConfig('qa-user', [
      'testing_split',
      'testing_split2',
      'testing_split3',
      'testing_not_exist'
    ]), {
      testing_split: { treatment: 'on', config: null },
      testing_split2: { treatment: 'off', config: null },
      testing_split3: { treatment: 'custom_treatment', config: null },
      testing_not_exist: { treatment: 'control', config: null }
    });

    setTimeout(() => { factory.settings.features = path.join(__dirname, '.split'); }, 290);
    setTimeout(() => { factory.settings.features = path.join(__dirname, '.split'); }, 590);
    setTimeout(() => { factory.settings.features = path.join(__dirname, '.split'); }, 890);
    setTimeout(() => { factory.settings.features = path.join(__dirname, 'update.split'); }, 1000);

    client.once(client.Event.SDK_UPDATE, () => {
      assert.equal(client.getTreatment('qa-user', 'testing_split4'), 'updated_treatment');

      networkAssertions(client, assert).then(() => {
        client.destroy().then(assert.end);
      });
    });
  });
}

function DotYAMLTests(mockFileName, mockFileExt, assert) {
  configMocks();
  const config = settingsGenerator(`${mockFileName}.${mockFileExt}`);
  const factory = SplitFactory(config);
  const client = factory.client();
  // Tracking some events to test they are not flushed.
  assert.true(client.track('a_key', 'a_tt', 'an_ev_id'));
  assert.true(client.track('another_key', 'another_tt', 'another_ev_id', 25));
  assert.false(client.track('wasa', {}, [], 'invalid_stuff'));

  client.on(client.Event.SDK_READY, function () {
    assert.equal(client.getTreatment('qa-user', 'testing_split_on'), 'on');
    assert.equal(client.getTreatment('qa-user', 'testing_split_only_wl'), 'control');
    assert.equal(client.getTreatment('key_for_wl', 'testing_split_only_wl'), 'whitelisted');
    assert.equal(client.getTreatment('qa-user', 'testing_split_with_wl'), 'not_in_whitelist');
    assert.equal(client.getTreatment('key_for_wl', 'testing_split_with_wl'), 'one_key_wl');
    assert.equal(client.getTreatment('key_for_wl_1', 'testing_split_with_wl'), 'multi_key_wl');
    assert.equal(client.getTreatment('key_for_wl_2', 'testing_split_with_wl'), 'multi_key_wl');
    assert.equal(client.getTreatment('qa-user', 'testing_split_off_with_config'), 'off');
    assert.equal(client.getTreatment('qa-user', 'not_existent'), 'control');

    assert.deepEqual(client.getTreatmentWithConfig('qa-user', 'testing_split_on'), { treatment: 'on', config: null });
    assert.deepEqual(client.getTreatmentWithConfig('qa-user', 'testing_split_only_wl'), { treatment: 'control', config: null });
    assert.deepEqual(client.getTreatmentWithConfig('key_for_wl', 'testing_split_only_wl'), { treatment: 'whitelisted', config: null });
    assert.deepEqual(client.getTreatmentWithConfig('qa-user', 'testing_split_with_wl'), { treatment: 'not_in_whitelist', config: '{"color": "green"}' });
    assert.deepEqual(client.getTreatmentWithConfig('key_for_wl', 'testing_split_with_wl'), { treatment: 'one_key_wl', config: null });
    assert.deepEqual(client.getTreatmentWithConfig('key_for_wl_1', 'testing_split_with_wl'), { treatment: 'multi_key_wl', config: '{"color": "brown"}' });
    assert.deepEqual(client.getTreatmentWithConfig('key_for_wl_2', 'testing_split_with_wl'), { treatment: 'multi_key_wl', config: '{"color": "brown"}' });
    assert.deepEqual(client.getTreatmentWithConfig('qa-user', 'testing_split_off_with_config'), { treatment: 'off', config: '{"color": "green"}' });
    assert.deepEqual(client.getTreatmentWithConfig('qa-user', 'not_existent'), { treatment: 'control', config: null });

    assert.deepEqual(client.getTreatments('qa-user', [
      'testing_split_on',
      'testing_split_only_wl',
      'testing_split_with_wl',
      'testing_split_off_with_config',
      'testing_not_exist'
    ]), {
      testing_split_on: 'on',
      testing_split_only_wl: 'control',
      testing_split_with_wl: 'not_in_whitelist',
      testing_split_off_with_config: 'off',
      testing_not_exist: 'control'
    });
    assert.deepEqual(client.getTreatmentsWithConfig('key_for_wl', [
      'testing_split_on',
      'testing_split_only_wl',
      'testing_split_with_wl',
      'testing_split_off_with_config',
      'testing_not_exist'
    ]), {
      testing_split_on: { treatment: 'on', config: null },
      testing_split_only_wl: { treatment: 'whitelisted', config: null },
      testing_split_with_wl: { treatment: 'one_key_wl', config: null },
      testing_split_off_with_config: { treatment: 'off', config: '{"color": "green"}' },
      testing_not_exist: { treatment: 'control', config: null }
    });

    let readyTimestamp = Date.now();

    setTimeout(() => { factory.settings.features = path.join(__dirname, `${mockFileName}.${mockFileExt}`); }, 290);
    setTimeout(() => { factory.settings.features = path.join(__dirname, `${mockFileName}.${mockFileExt}`); }, 590);
    setTimeout(() => { factory.settings.features = path.join(__dirname, `${mockFileName}.${mockFileExt}`); }, 890);
    setTimeout(() => { factory.settings.features = path.join(__dirname, `update.${mockFileName}.${mockFileExt}`); }, 1000);

    client.once(client.Event.SDK_UPDATE, () => {
      assert.equal(client.getTreatment('qa-user', 'testing_split_update'), 'updated_treatment', 'the update should be properly processed');
      assert.true((Date.now() - readyTimestamp) > 1000);

      networkAssertions(client, assert).then(() => {
        client.destroy().then(assert.end);
      });
    });
  });
}

function ManagerDotSplitTests(assert) {
  configMocks();
  const config = settingsGenerator('.split');
  const factory = SplitFactory(config);
  const client = factory.client();
  const manager = factory.manager();

  manager.on(manager.Event.SDK_READY, function () {
    assert.deepEqual(manager.names(), ['testing_split', 'testing_split2', 'testing_split3']);

    const expectedView1 = {
      name: 'testing_split', changeNumber: 0, killed: false, trafficType: 'localhost',
      treatments: ['on'], configs: {}, defaultTreatment: 'control',
      sets: [], impressionsDisabled: false, prerequisites: []
    };
    const expectedView2 = {
      name: 'testing_split2', changeNumber: 0, killed: false, trafficType: 'localhost',
      treatments: ['off'], configs: {}, defaultTreatment: 'control',
      sets: [], impressionsDisabled: false, prerequisites: []
    };
    const expectedView3 = {
      name: 'testing_split3', changeNumber: 0, killed: false, trafficType: 'localhost',
      treatments: ['custom_treatment'], configs: {}, defaultTreatment: 'control',
      sets: [], impressionsDisabled: false, prerequisites: []
    };

    assert.deepEqual(manager.split('testing_split'), expectedView1);
    assert.deepEqual(manager.split('testing_split2'), expectedView2);
    assert.deepEqual(manager.split('testing_split3'), expectedView3);
    assert.equal(manager.split('split_not_existent'), null);

    assert.deepEqual(manager.splits(), [expectedView1, expectedView2, expectedView3]);

    networkAssertions(client, assert).then(() => {
      client.destroy().then(assert.end);
    });
  });
}

function ManagerDotYamlTests(mockFileName, assert) {
  configMocks();
  const config = settingsGenerator(mockFileName);
  const factory = SplitFactory(config);
  const client = factory.client();
  const manager = factory.manager();

  manager.on(manager.Event.SDK_READY, function () {
    assert.deepEqual(manager.names(), ['testing_split_on', 'testing_split_only_wl', 'testing_split_with_wl', 'testing_split_off_with_config']);

    const expectedView1 = {
      name: 'testing_split_on',
      changeNumber: 0,
      killed: false,
      trafficType: 'localhost',
      treatments: ['on'],
      configs: {},
      sets: [],
      defaultTreatment: 'control',
      impressionsDisabled: false,
      prerequisites: []
    };
    const expectedView2 = {
      name: 'testing_split_only_wl',
      changeNumber: 0,
      killed: false,
      trafficType: 'localhost',
      treatments: ['whitelisted'],
      configs: {},
      sets: [],
      defaultTreatment: 'control',
      impressionsDisabled: false,
      prerequisites: []
    };
    const expectedView3 = {
      name: 'testing_split_with_wl',
      changeNumber: 0,
      killed: false,
      trafficType: 'localhost',
      treatments: ['not_in_whitelist', 'one_key_wl', 'multi_key_wl'],
      configs: {
        not_in_whitelist: '{"color": "green"}',
        multi_key_wl: '{"color": "brown"}'
      },
      sets: [],
      defaultTreatment: 'control',
      impressionsDisabled: false,
      prerequisites: []
    };
    const expectedView4 = {
      name: 'testing_split_off_with_config',
      changeNumber: 0,
      killed: false,
      trafficType: 'localhost',
      treatments: ['off'],
      configs: {
        off: '{"color": "green"}'
      },
      sets: [],
      defaultTreatment: 'control',
      impressionsDisabled: false,
      prerequisites: []
    };

    assert.deepEqual(manager.split('testing_split_on'), expectedView1);
    assert.deepEqual(manager.split('testing_split_only_wl'), expectedView2);
    assert.deepEqual(manager.split('testing_split_with_wl'), expectedView3);
    assert.deepEqual(manager.split('testing_split_off_with_config'), expectedView4);
    assert.equal(manager.split('not_existent'), null);

    assert.deepEqual(manager.splits(), [expectedView1, expectedView2, expectedView3, expectedView4]);

    networkAssertions(client, assert).then(() => {
      client.destroy().then(assert.end);
    });
  });
}


function MultipleInstancesTests(assert) {
  configMocks();
  const config = settingsGenerator('.split');

  // Creates multiple factories with the same mock file
  const factories = [SplitFactory(config), SplitFactory(config), SplitFactory({ ...config })];

  // Creates another factory with a different mock file
  const factoryWithYaml = SplitFactory(settingsGenerator('split.yaml'));
  const clientWithYaml = factoryWithYaml.client();
  let readyCount = 0, updateCount = 0;
  clientWithYaml.on(clientWithYaml.Event.SDK_READY, () => { readyCount++; });
  clientWithYaml.on(clientWithYaml.Event.SDK_UPDATE, () => { updateCount++; });

  for (let i = 0; i < factories.length; i++) {
    let factory = factories[i], client = factories[i].client(), manager = factories[i].manager();

    /* Asserts on SDK client */

    // Tracking some events to test they are not flushed.
    client.track('a_key', 'a_tt', 'an_ev_id');
    client.track('another_key', 'another_tt', 'another_ev_id', 25);

    client.on(client.Event.SDK_READY, function () {
      assert.equal(client.getTreatment('qa-user', 'testing_split'), 'on');
      assert.equal(client.getTreatment('qa-user', 'testing_split_2'), 'control');
      assert.deepEqual(client.getTreatmentWithConfig('qa-user', 'testing_split'), { treatment: 'on', config: null });
      assert.deepEqual(client.getTreatmentWithConfig('qa-user', 'testing_split_2'), { treatment: 'control', config: null });

      assert.deepEqual(client.getTreatments('qa-user', [
        'testing_split',
        'testing_split2',
        'testing_split3',
        'testing_not_exist'
      ]), {
        testing_split: 'on',
        testing_split2: 'off',
        testing_split3: 'custom_treatment',
        testing_not_exist: 'control'
      });
      assert.deepEqual(client.getTreatmentsWithConfig('qa-user', [
        'testing_split',
        'testing_split2',
        'testing_split3',
        'testing_not_exist'
      ]), {
        testing_split: { treatment: 'on', config: null },
        testing_split2: { treatment: 'off', config: null },
        testing_split3: { treatment: 'custom_treatment', config: null },
        testing_not_exist: { treatment: 'control', config: null }
      });

      setTimeout(() => { factory.settings.features = path.join(__dirname, '.split'); }, 290);
      setTimeout(() => { factory.settings.features = path.join(__dirname, '.split'); }, 590);
      setTimeout(() => { factory.settings.features = path.join(__dirname, '.split'); }, 890);
      setTimeout(() => { factory.settings.features = path.join(__dirname, 'update.split'); }, 1000);

      /* Asserts on SDK managers */
      manager.on(manager.Event.SDK_READY, function () {
        assert.deepEqual(manager.names(), ['testing_split', 'testing_split2', 'testing_split3']);

        const expectedView1 = {
          name: 'testing_split', changeNumber: 0, killed: false, trafficType: 'localhost',
          treatments: ['on'], configs: {}, sets: [], impressionsDisabled: false, prerequisites: []
        };
        const expectedView2 = {
          name: 'testing_split2', changeNumber: 0, killed: false, trafficType: 'localhost',
          treatments: ['off'], configs: {}, sets: [], impressionsDisabled: false, prerequisites: []
        };
        const expectedView3 = {
          name: 'testing_split3', changeNumber: 0, killed: false, trafficType: 'localhost',
          treatments: ['custom_treatment'], configs: {}, sets: [], impressionsDisabled: false, prerequisites: []
        };

        assert.deepEqual(manager.split('testing_split'), expectedView1);
        assert.deepEqual(manager.split('testing_split2'), expectedView2);
        assert.deepEqual(manager.split('testing_split3'), expectedView3);
        assert.equal(manager.split('split_not_existent'), null);

        assert.deepEqual(manager.splits(), [expectedView1, expectedView2, expectedView3]);

      });

      client.once(client.Event.SDK_UPDATE, () => {
        assert.equal(client.getTreatment('qa-user', 'testing_split4'), 'updated_treatment');

        client.once(client.Event.SDK_UPDATE, function () { assert.fail('Should not emit a second SDK_UPDATE event'); });

        setTimeout(() => {
          networkAssertions(client, assert).then(() => {
            client.destroy().then(() => {
              // End test on the last factory
              if (i === factories.length - 1) {
                clientWithYaml.destroy();
                assert.equal(readyCount, 1, 'The factory with a different mock file should have emitted SDK_READY');
                assert.equal(updateCount, 0, 'The factory with a different mock file should not have emitted SDK_UPDATE');

                assert.end();
              }
            });
          });
        });
      });
    });
  }
}
