import { run } from '@ember/runloop';
import { module, test } from 'qunit';
import { setupRenderingTest } from 'ember-qunit';
import { find, click, render, settled } from '@ember/test-helpers';
import hbs from 'htmlbars-inline-precompile';
import { componentA11yAudit } from 'nomad-ui/tests/helpers/a11y-audit';
import Pretender from 'pretender';
import { logEncode } from '../../../mirage/data/logs';

const HOST = '1.1.1.1:1111';
const allowedConnectionTime = 100;
const commonProps = {
  interval: 200,
  allocation: {
    id: 'alloc-1',
    node: {
      httpAddr: HOST,
    },
  },
  taskState: 'task-name',
  clientTimeout: allowedConnectionTime,
  serverTimeout: allowedConnectionTime,
};

const logHead = [logEncode(['HEAD'], 0)];
const logTail = [logEncode(['TAIL'], 0)];
const streamFrames = ['one\n', 'two\n', 'three\n', 'four\n', 'five\n'];
let streamPointer = 0;
let logMode = null;

module('Integration | Component | task log', function(hooks) {
  setupRenderingTest(hooks);

  hooks.beforeEach(function() {
    const handler = ({ queryParams }) => {
      let frames;
      let data;

      if (logMode === 'head') {
        frames = logHead;
      } else if (logMode === 'tail') {
        frames = logTail;
      } else {
        frames = streamFrames;
      }

      if (frames === streamFrames) {
        data = queryParams.plain ? frames[streamPointer] : logEncode(frames, streamPointer);
        streamPointer++;
      } else {
        data = queryParams.plain ? frames.join('') : logEncode(frames, frames.length - 1);
      }

      return [200, {}, data];
    };

    this.server = new Pretender(function() {
      this.get(`http://${HOST}/v1/client/fs/logs/:allocation_id`, handler);
      this.get('/v1/client/fs/logs/:allocation_id', handler);
      this.get('/v1/regions', () => [200, {}, '[]']);
    });
  });

  hooks.afterEach(function() {
    window.localStorage.clear();
    this.server.shutdown();
    streamPointer = 0;
    logMode = null;
  });

  test('Basic appearance', async function(assert) {
    run.later(run, run.cancelTimers, commonProps.interval);

    this.setProperties(commonProps);
    await render(hbs`<TaskLog @allocation={{allocation}} @task={{taskState}} />`);

    assert.ok(find('[data-test-log-action="stdout"]'), 'Stdout button');
    assert.ok(find('[data-test-log-action="stderr"]'), 'Stderr button');
    assert.ok(find('[data-test-log-action="head"]'), 'Head button');
    assert.ok(find('[data-test-log-action="tail"]'), 'Tail button');
    assert.ok(find('[data-test-log-action="toggle-stream"]'), 'Stream toggle button');

    assert.ok(find('[data-test-log-box].is-full-bleed.is-dark'), 'Body is full-bleed and dark');

    assert.ok(
      find('pre.cli-window'),
      'Cli is preformatted and using the cli-window component class'
    );

    await componentA11yAudit(this.element, assert);
  });

  test('Streaming starts on creation', async function(assert) {
    run.later(run, run.cancelTimers, commonProps.interval);

    this.setProperties(commonProps);
    await render(hbs`<TaskLog @allocation={{allocation}} @task={{taskState}} />`);

    const logUrlRegex = new RegExp(`${HOST}/v1/client/fs/logs/${commonProps.allocation.id}`);
    assert.ok(
      this.server.handledRequests.filter(req => logUrlRegex.test(req.url)).length,
      'Log requests were made'
    );

    await settled();
    assert.equal(
      find('[data-test-log-cli]').textContent,
      streamFrames[0],
      'First chunk of streaming log is shown'
    );

    await componentA11yAudit(this.element, assert);
  });

  test('Clicking Head loads the log head', async function(assert) {
    logMode = 'head';
    run.later(run, run.cancelTimers, commonProps.interval);

    this.setProperties(commonProps);
    await render(hbs`<TaskLog @allocation={{allocation}} @task={{taskState}} />`);

    click('[data-test-log-action="head"]');

    await settled();
    assert.ok(
      this.server.handledRequests.find(
        ({ queryParams: qp }) => qp.origin === 'start' && qp.offset === '0'
      ),
      'Log head request was made'
    );
    assert.equal(find('[data-test-log-cli]').textContent, logHead[0], 'Head of the log is shown');
  });

  test('Clicking Tail loads the log tail', async function(assert) {
    logMode = 'tail';
    run.later(run, run.cancelTimers, commonProps.interval);

    this.setProperties(commonProps);
    await render(hbs`<TaskLog @allocation={{allocation}} @task={{taskState}} />`);

    click('[data-test-log-action="tail"]');

    await settled();
    assert.ok(
      this.server.handledRequests.find(({ queryParams: qp }) => qp.origin === 'end'),
      'Log tail request was made'
    );
    assert.equal(find('[data-test-log-cli]').textContent, logTail[0], 'Tail of the log is shown');
  });

  test('Clicking toggleStream starts and stops the log stream', async function(assert) {
    run.later(run, run.cancelTimers, commonProps.interval);

    const { interval } = commonProps;
    this.setProperties(commonProps);
    await render(
      hbs`<TaskLog @allocation={{allocation}} @task={{taskState}} @interval={{interval}} />`
    );

    run.later(() => {
      click('[data-test-log-action="toggle-stream"]');
    }, interval);

    await settled();
    assert.equal(find('[data-test-log-cli]').textContent, streamFrames[0], 'First frame loaded');

    run.later(() => {
      assert.equal(
        find('[data-test-log-cli]').textContent,
        streamFrames[0],
        'Still only first frame'
      );
      click('[data-test-log-action="toggle-stream"]');
      run.later(run, run.cancelTimers, interval * 2);
    }, interval * 2);

    await settled();
    assert.equal(
      find('[data-test-log-cli]').textContent,
      streamFrames[0] + streamFrames[0] + streamFrames[1],
      'Now includes second frame'
    );
  });

  test('Clicking stderr switches the log to standard error', async function(assert) {
    run.later(run, run.cancelTimers, commonProps.interval);

    this.setProperties(commonProps);
    await render(hbs`<TaskLog @allocation={{allocation}} @task={{taskState}} />`);

    click('[data-test-log-action="stderr"]');
    run.later(run, run.cancelTimers, commonProps.interval);

    await settled();
    assert.ok(
      this.server.handledRequests.filter(req => req.queryParams.type === 'stderr').length,
      'stderr log requests were made'
    );
  });

  test('Clicking stderr/stdout mode buttons does nothing when the mode remains the same', async function(assert) {
    const { interval } = commonProps;

    run.later(() => {
      click('[data-test-log-action="stdout"]');
      run.later(run, run.cancelTimers, interval * 6);
    }, interval * 2);

    this.setProperties(commonProps);
    await render(hbs`<TaskLog @allocation={{allocation}} @task={{taskState}} />`);

    await settled();
    assert.equal(
      find('[data-test-log-cli]').textContent,
      streamFrames[0] + streamFrames[0] + streamFrames[1],
      'Now includes second frame'
    );
  });

  test('When the client is inaccessible, task-log falls back to requesting logs through the server', async function(assert) {
    run.later(run, run.cancelTimers, allowedConnectionTime * 2);

    // override client response to timeout
    this.server.get(
      `http://${HOST}/v1/client/fs/logs/:allocation_id`,
      () => [400, {}, ''],
      allowedConnectionTime * 2
    );

    this.setProperties(commonProps);
    await render(hbs`<TaskLog
      @allocation={{allocation}}
      @task={{taskState}}
      @clientTimeout={{clientTimeout}}
      @serverTimeout={{serverTimeout}} />`);

    const clientUrlRegex = new RegExp(`${HOST}/v1/client/fs/logs/${commonProps.allocation.id}`);
    assert.ok(
      this.server.handledRequests.filter(req => clientUrlRegex.test(req.url)).length,
      'Log request was initially made directly to the client'
    );

    await settled();
    const serverUrl = `/v1/client/fs/logs/${commonProps.allocation.id}`;
    assert.ok(
      this.server.handledRequests.filter(req => req.url.startsWith(serverUrl)).length,
      'Log request was later made to the server'
    );

    assert.ok(
      this.server.handledRequests.filter(req => clientUrlRegex.test(req.url))[0].aborted,
      'Client log request was aborted'
    );
  });

  test('When both the client and the server are inaccessible, an error message is shown', async function(assert) {
    run.later(run, run.cancelTimers, allowedConnectionTime * 5);

    // override client and server responses to timeout
    this.server.get(
      `http://${HOST}/v1/client/fs/logs/:allocation_id`,
      () => [400, {}, ''],
      allowedConnectionTime * 2
    );
    this.server.get(
      '/v1/client/fs/logs/:allocation_id',
      () => [400, {}, ''],
      allowedConnectionTime * 2
    );

    this.setProperties(commonProps);
    await render(hbs`<TaskLog
      @allocation={{allocation}}
      @task={{taskState}}
      @clientTimeout={{clientTimeout}}
      @serverTimeout={{serverTimeout}} />`);

    await settled();
    const clientUrlRegex = new RegExp(`${HOST}/v1/client/fs/logs/${commonProps.allocation.id}`);
    assert.ok(
      this.server.handledRequests.filter(req => clientUrlRegex.test(req.url)).length,
      'Log request was initially made directly to the client'
    );
    const serverUrl = `/v1/client/fs/logs/${commonProps.allocation.id}`;
    assert.ok(
      this.server.handledRequests.filter(req => req.url.startsWith(serverUrl)).length,
      'Log request was later made to the server'
    );
    assert.ok(find('[data-test-connection-error]'), 'An error message is shown');

    await click('[data-test-connection-error-dismiss]');
    assert.notOk(find('[data-test-connection-error]'), 'The error message is dismissable');

    await componentA11yAudit(this.element, assert);
  });

  test('When the client is inaccessible, the server is accessible, and stderr is pressed before the client timeout occurs, the no connection error is not shown', async function(assert) {
    // override client response to timeout
    this.server.get(
      `http://${HOST}/v1/client/fs/logs/:allocation_id`,
      () => [400, {}, ''],
      allowedConnectionTime * 2
    );

    // Click stderr before the client request responds
    run.later(() => {
      click('[data-test-log-action="stderr"]');
      run.later(run, run.cancelTimers, commonProps.interval * 5);
    }, allowedConnectionTime / 2);

    this.setProperties(commonProps);
    await render(hbs`<TaskLog
      @allocation={{allocation}}
      @task={{taskState}}
      @clientTimeout={{clientTimeout}}
      @serverTimeout={{serverTimeout}} />`);

    await settled();

    const clientUrlRegex = new RegExp(`${HOST}/v1/client/fs/logs/${commonProps.allocation.id}`);
    const clientRequests = this.server.handledRequests.filter(req => clientUrlRegex.test(req.url));
    assert.ok(
      clientRequests.find(req => req.queryParams.type === 'stdout'),
      'Client request for stdout'
    );
    assert.ok(
      clientRequests.find(req => req.queryParams.type === 'stderr'),
      'Client request for stderr'
    );

    const serverUrl = `/v1/client/fs/logs/${commonProps.allocation.id}`;
    assert.ok(
      this.server.handledRequests
        .filter(req => req.url.startsWith(serverUrl))
        .find(req => req.queryParams.type === 'stderr'),
      'Server request for stderr'
    );

    assert.notOk(find('[data-test-connection-error]'), 'An error message is not shown');
  });

  test('The log streaming mode is persisted in localStorage', async function(assert) {
    window.localStorage.nomadLogMode = JSON.stringify('stderr');

    run.later(run, run.cancelTimers, commonProps.interval);

    this.setProperties(commonProps);
    await render(hbs`<TaskLog @allocation={{allocation}} @task={{taskState}} />`);

    await settled();
    assert.ok(this.server.handledRequests.filter(req => req.queryParams.type === 'stderr').length);
    assert.notOk(
      this.server.handledRequests.filter(req => req.queryParams.type === 'stdout').length
    );

    click('[data-test-log-action="stdout"]');
    run.later(run, run.cancelTimers, commonProps.interval);

    await settled();
    assert.ok(this.server.handledRequests.filter(req => req.queryParams.type === 'stdout').length);
    assert.equal(window.localStorage.nomadLogMode, JSON.stringify('stdout'));
  });
});