// Copyright IBM Corp. 2013,2019. All Rights Reserved.
// Node module: loopback-component-explorer
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT

'use strict';

// NOTE(bajtos) It's important to run this check before we load the Explorer
// because require() may fail (e.g. with MODULE_NOT_FOUND error) and make
// it difficult to identify the actual problem
const uiVersion = require('../package.json').dependencies['swagger-ui'];
if (!uiVersion.startsWith('^2')) {
  console.error(`
Upgrading from swagger-ui@2 to a newer major version (${uiVersion}) is difficult,
see https://github.com/strongloop/loopback-component-explorer/issues/254
If you are confident about this change and have manually verified API Explorer
functionality in the browser, including access-token based authentication,
then you can delete this check.
`);
  process.exit(2);
}

const loopback = require('loopback');
const explorer = require('../');
const request = require('supertest');
const assert = require('assert');
const path = require('path');
const expect = require('chai').expect;
const urlJoin = require('../lib/url-join');
const os = require('os');

describe('explorer', function() {
  describe('with default config', function() {
    beforeEach(givenLoopBackAppWithExplorer());

    it('should register "loopback-component-explorer" to the app', function() {
      expect(this.app.get('loopback-component-explorer'))
        .to.have.property('mountPath', '/explorer');
    });

    it('should redirect to /explorer/', function(done) {
      request(this.app)
        .get('/explorer')
        .expect(301)
        .end(done);
    });

    it('should serve the explorer at /explorer/', function(done) {
      request(this.app)
        .get('/explorer/')
        .expect('Content-Type', /html/)
        .expect(200)
        .end(function(err, res) {
          if (err) return done(err);

          assert(!!~res.text.indexOf('<title>LoopBack API Explorer</title>'),
            'text does not contain expected string');

          done();
        });
    });

    it('should serve correct swagger-ui config', function(done) {
      request(this.app)
        .get('/explorer/config.json')
        .expect('Content-Type', /json/)
        .expect(200)
        .end(function(err, res) {
          if (err) return done(err);

          expect(res.body).to
            .have.property('url', '/explorer/swagger.json');

          done();
        });
    });
  });

  describe('when filename is included in url', function() {
    beforeEach(givenLoopBackAppWithExplorer());

    it('should serve the explorer at /explorer/index.html', function(done) {
      request(this.app)
        .get('/explorer/index.html')
        .expect('Content-Type', /html/)
        .expect(200)
        .end(function(err, res) {
          if (err) throw err;

          assert(!!~res.text.indexOf('<title>LoopBack API Explorer</title>'),
            'text does not contain expected string');

          done();
        });
    });

    it('should serve correct swagger-ui config', function(done) {
      request(this.app)
        .get('/explorer/config.json')
        .set('Referer', 'http://example.com/explorer/index.html')
        .expect('Content-Type', /json/)
        .expect(200)
        .end(function(err, res) {
          if (err) return done(err);

          expect(res.body).to
            .have.property('url', '/explorer/swagger.json');

          done();
        });
    });
  });

  describe('with custom explorer base', function() {
    beforeEach(givenLoopBackAppWithExplorer('/swagger'));

    it('should register "loopback-component-explorer" to the app', function() {
      expect(this.app.get('loopback-component-explorer'))
        .to.have.property('mountPath', '/swagger');
    });

    it('should serve correct swagger-ui config', function(done) {
      request(this.app)
        .get('/swagger/config.json')
        .expect('Content-Type', /json/)
        .expect(200)
        .end(function(err, res) {
          if (err) return done(err);

          expect(res.body).to
            .have.property('url', '/swagger/swagger.json');

          done();
        });
    });
  });

  describe('with custom app.restApiRoot', function() {
    it('should serve correct swagger-ui config', function(done) {
      const app = loopback();
      app.set('restApiRoot', '/rest-api-root');
      app.set('remoting', {cors: false});
      configureRestApiAndExplorer(app);

      request(app)
        .get('/explorer/config.json')
        .expect(200)
        .end(function(err, res) {
          if (err) return done(err);

          expect(res.body).to
            .have.property('url', '/explorer/swagger.json');

          done();
        });
    });

    it('removes trailing slash from baseUrl', function(done) {
      // SwaggerUI builds resource URL by concatenating basePath + resourcePath
      // Since the resource paths are always startign with a slash,
      // if the basePath ends with a slash too, an incorrect URL is produced
      const app = loopback();
      app.set('restApiRoot', '/apis/');
      app.set('remoting', {cors: false});
      configureRestApiAndExplorer(app);

      request(app)
        .get('/explorer/swagger.json')
        .expect(200)
        .end(function(err, res) {
          if (err) return done(err);

          const baseUrl = res.body.basePath;
          const apiPath = Object.keys(res.body.paths)[0];
          expect(baseUrl + apiPath).to.equal('/apis/products');

          done();
        });
    });
  });

  describe('with custom front-end files', function() {
    let app;
    beforeEach(function setupExplorerWithUiDirs() {
      app = loopback();
      app.set('remoting', {cors: false});
      explorer(app, {
        uiDirs: [path.resolve(__dirname, 'fixtures', 'dummy-swagger-ui')],
      });
    });

    it('overrides swagger-ui files', function(done) {
      request(app).get('/explorer/swagger-ui.js')
        .expect(200)
        .end(function(err, res) {
          if (err) return done(err);

          // expect the content of `dummy-swagger-ui/swagger-ui.js`
          expect(res.text).to.contain('/* custom swagger-ui file */');

          done();
        });
    });

    it('overrides strongloop overrides', function(done) {
      request(app).get('/explorer/')
        .expect(200)
        .end(function(err, res) {
          if (err) return done(err);
          // expect the content of `dummy-swagger-ui/index.html`
          expect(res.text).to.contain('custom index.html');
          done();
        });
    });
  });

  describe('with swaggerUI option', function() {
    let app;
    beforeEach(function setupExplorerWithoutUI() {
      app = loopback();
      app.set('remoting', {cors: false});
      explorer(app, {
        swaggerUI: false,
      });
    });

    it('overrides swagger-ui files', function(done) {
      request(app).get('/explorer/swagger-ui.js')
        .expect(404, done);
    });

    it('should serve config.json', function(done) {
      request(app)
        .get('/explorer/config.json')
        .expect(200)
        .end(function(err, res) {
          if (err) return done(err);

          expect(res.body).to
            .have.property('url', '/explorer/swagger.json');

          done();
        });
    });

    it('should serve swagger.json', function(done) {
      request(app)
        .get('/explorer/swagger.json')
        .expect(200, done);
    });
  });

  describe('explorer.routes API', function() {
    let app;
    beforeEach(function() {
      app = loopback();
      app.set('remoting', {cors: false});
      const Product = loopback.PersistedModel.extend('product');
      Product.attachTo(loopback.memory());
      app.model(Product);
    });

    it('creates explorer routes', function(done) {
      app.use('/explorer', explorer.routes(app));
      app.use(app.get('restApiRoot') || '/', loopback.rest());

      request(app)
        .get('/explorer/config.json')
        .expect('Content-Type', /json/)
        .expect(200)
        .end(done);
    });
  });

  describe('when specifying custom static file root directories', function() {
    let app;
    beforeEach(function() {
      app = loopback();
      app.set('remoting', {cors: false});
    });

    it('should allow `uiDirs` to be defined as an Array', function(done) {
      explorer(app, {
        uiDirs: [path.resolve(__dirname, 'fixtures', 'dummy-swagger-ui')],
      });

      request(app).get('/explorer/')
        .expect(200)
        .end(function(err, res) {
          if (err) return done(err);
          // expect the content of `dummy-swagger-ui/index.html`
          expect(res.text).to.contain('custom index.html');
          done();
        });
    });

    it('should allow `uiDirs` to be defined as an String', function(done) {
      explorer(app, {
        uiDirs: path.resolve(__dirname, 'fixtures', 'dummy-swagger-ui'),
      });

      request(app).get('/explorer/')
        .expect(200)
        .end(function(err, res) {
          if (err) return done(err);
          // expect the content of `dummy-swagger-ui/index.html`
          expect(res.text).to.contain('custom index.html');
          done();
        });
    });
  });

  it('updates swagger object when a new model is added', function(done) {
    const app = loopback();
    app.set('remoting', {cors: false});
    configureRestApiAndExplorer(app, '/explorer');

    // Ensure the swagger object was built
    request(app)
      .get('/explorer/swagger.json')
      .expect(200)
      .end(function(err) {
        if (err) return done(err);

        // Create a new model
        const Model = loopback.PersistedModel.extend('Customer');
        Model.attachTo(loopback.memory());
        app.model(Model);

        // Request swagger.json again
        request(app)
          .get('/explorer/swagger.json')
          .expect(200)
          .end(function(err, res) {
            if (err) return done(err);

            const modelNames = Object.keys(res.body.definitions);
            expect(modelNames).to.contain('Customer');
            const paths = Object.keys(res.body.paths);
            expect(paths).to.have.contain('/Customers');

            done();
          });
      });
  });

  it('updates swagger object when a model is removed', function(done) {
    const app = loopback();
    app.set('remoting', {cors: false});
    configureRestApiAndExplorer(app, '/explorer');

    const Model = loopback.PersistedModel.extend('Customer');
    Model.attachTo(loopback.memory());
    app.model(Model);

    // Ensure the swagger object was built
    request(app)
      .get('/explorer/swagger.json')
      .expect(200)
      .end(function(err) {
        if (err) return done(err);

        app.deleteModelByName('Customer');

        // Request swagger.json again
        request(app)
          .get('/explorer/swagger.json')
          .expect(200)
          .end(function(err, res) {
            if (err) return done(err);

            const modelNames = Object.keys(res.body.definitions);
            expect(modelNames).to.not.contain('Customer');
            const paths = Object.keys(res.body.paths);
            expect(paths).to.not.contain('/Customers');

            done();
          });
      });
  });

  it('updates swagger object when a remote method is disabled', function(done) {
    const app = loopback();
    app.set('remoting', {cors: false});
    configureRestApiAndExplorer(app, '/explorer');

    // Ensure the swagger object was built
    request(app)
      .get('/explorer/swagger.json')
      .expect(200)
      .end(function(err, res) {
        if (err) return done(err);

        // Check the method that will be disabled
        const paths = Object.keys(res.body.paths);
        expect(paths).to.contain('/products/findOne');

        const Product = app.models.Product;
        Product.disableRemoteMethodByName('findOne');

        // Request swagger.json again
        request(app)
          .get('/explorer/swagger.json')
          .expect(200)
          .end(function(err, res) {
            if (err) return done(err);

            const paths = Object.keys(res.body.paths);
            expect(paths).to.not.contain('/products/findOne');

            done();
          });
      });
  });

  it('updates swagger object when a remote method is added', function(done) {
    const app = loopback();
    app.set('remoting', {cors: false});
    configureRestApiAndExplorer(app, '/explorer');

    // Ensure the swagger object was built
    request(app)
      .get('/explorer/swagger.json')
      .expect(200)
      .end(function(err, res) {
        if (err) return done(err);

        // Check the method that will be disabled
        const paths = Object.keys(res.body.paths);
        expect(paths).to.contain('/products/findOne');

        const Product = app.models.Product;
        Product.findOne2 = function(cb) { cb(null, 1); };
        Product.remoteMethod('findOne2', {});

        // Request swagger.json again
        request(app)
          .get('/explorer/swagger.json')
          .expect(200)
          .end(function(err, res) {
            if (err) return done(err);

            const paths = Object.keys(res.body.paths);
            expect(paths).to.contain('/products/findOne2');

            done();
          });
      });
  });

  function givenLoopBackAppWithExplorer(explorerBase) {
    return function(done) {
      const app = this.app = loopback();
      app.set('remoting', {cors: false});
      configureRestApiAndExplorer(app, explorerBase);

      done();
    };
  }

  function configureRestApiAndExplorer(app, explorerBase) {
    const Product = loopback.PersistedModel.extend('product');
    Product.attachTo(loopback.memory());
    app.model(Product);

    explorer(app, {mountPath: explorerBase});
    app.set('legacyExplorer', false);
    app.use(app.get('restApiRoot') || '/', loopback.rest());
  }
});