/* eslint-env mocha */
import { expect } from '@open-wc/testing';
import sinon from 'sinon';

import { AjaxClass } from '../src/AjaxClass.js';

describe('AjaxClass interceptors', () => {
  let server;

  beforeEach(() => {
    server = sinon.fakeServer.create({ autoRespond: true });
  });

  afterEach(() => {
    server.restore();
  });

  describe('use cases', () => {
    it('can be added on a class for all instances', () => {
      ['requestInterceptors', 'responseInterceptors'].forEach(type => {
        const myInterceptor = () => {};
        class MyApi extends AjaxClass {
          constructor() {
            super();
            this[type] = [...this[type], myInterceptor];
          }
        }
        const ajaxWithout = AjaxClass.getNewInstance();
        const ajaxWith = MyApi.getNewInstance();
        expect(ajaxWithout[type]).to.not.include(myInterceptor);
        expect(ajaxWith[type]).to.include(myInterceptor);
      });
    });

    it('can be added per instance without changing the class', () => {
      ['requestInterceptors', 'responseInterceptors'].forEach(type => {
        const myInterceptor = () => {};
        const ajaxWithout = AjaxClass.getNewInstance();
        const ajaxWith = AjaxClass.getNewInstance();
        ajaxWith[type].push(myInterceptor);
        expect(ajaxWithout[type]).to.not.include(myInterceptor);
        expect(ajaxWith[type]).to.include(myInterceptor);
      });
    });

    it('can be removed after request', async () => {
      await Promise.all(
        ['requestInterceptors', 'responseInterceptors'].map(async type => {
          server.respondWith('GET', 'data.json', [
            200,
            { 'Content-Type': 'application/json' },
            '{}',
          ]);

          const myInterceptor = sinon.spy(foo => foo);

          const ajax = AjaxClass.getNewInstance();

          ajax[type].push(myInterceptor);
          await ajax.get('data.json');

          ajax[type] = ajax[type].filter(item => item !== myInterceptor);
          await ajax.get('data.json');

          expect(myInterceptor.callCount).to.eql(1);
        }),
      );
    });

    it('has access to provided instance config(options) on requestInterceptors', async () => {
      server.respondWith('GET', 'data.json', [200, { 'Content-Type': 'application/json' }, '{}']);
      const ajax = AjaxClass.getNewInstance();
      ajax.options.myCustomValue = 'foo';
      let customValueAccess = false;
      const myInterceptor = config => {
        customValueAccess = config.myCustomValue === 'foo';
        return config;
      };
      ajax.requestInterceptors.push(myInterceptor);
      await ajax.get('data.json');
      expect(customValueAccess).to.eql(true);
    });
  });

  describe('requestInterceptors', () => {
    it('allow to intercept request to change config', async () => {
      server.respondWith('POST', 'data.json', [
        200,
        { 'Content-Type': 'application/json' },
        '{ "method": "post" }',
      ]);
      server.respondWith('PUT', 'data.json', [
        200,
        { 'Content-Type': 'application/json' },
        '{ "method": "put" }',
      ]);
      const enforcePutInterceptor = config => ({ ...config, method: 'PUT' });
      const myAjax = AjaxClass.getNewInstance();
      myAjax.requestInterceptors.push(enforcePutInterceptor);
      const response = await myAjax.post('data.json');
      expect(response.data).to.deep.equal({ method: 'put' });
    });
  });

  describe('responseInterceptors', () => {
    it('allow to intercept response to change data', async () => {
      server.respondWith('GET', 'data.json', [
        200,
        { 'Content-Type': 'application/json' },
        '{ "method": "get" }',
      ]);
      const addDataInterceptor = response => ({
        ...response,
        data: { ...response.data, foo: 'bar' },
      });
      const myAjax = AjaxClass.getNewInstance();
      myAjax.responseInterceptors.push(addDataInterceptor);
      const response = await myAjax.get('data.json');
      expect(response.data).to.deep.equal({ method: 'get', foo: 'bar' });
    });
  });
});