// Copyright IBM Corp. 2014,2018. All Rights Reserved.
// Node module: loopback
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT

'use strict';
const assert = require('assert');
const expect = require('./helpers/expect');
const loopback = require('../');
const path = require('path');
const request = require('supertest');

describe('loopback.rest', function() {
  this.timeout(10000);
  let app, MyModel;

  beforeEach(function() {
    // override the global app object provided by test/support.js
    // and create a local one that does not share state with other tests
    app = loopback({localRegistry: true, loadBuiltinModels: true});
    app.set('remoting', {errorHandler: {debug: true, log: false}});
    const db = app.dataSource('db', {connector: 'memory'});
    MyModel = app.registry.createModel('MyModel');
    MyModel.attachTo(db);
  });

  it('works out-of-the-box', function(done) {
    app.model(MyModel);
    app.use(loopback.rest());
    request(app).get('/mymodels')
      .expect(200)
      .end(done);
  });

  it('should report 200 for DELETE /:id found', function(done) {
    app.model(MyModel);
    app.use(loopback.rest());
    MyModel.create({name: 'm1'}, function(err, inst) {
      request(app)
        .del('/mymodels/' + inst.id)
        .expect(200, function(err, res) {
          expect(res.body.count).to.equal(1);

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

  it('should report 404 for GET /:id not found', function(done) {
    app.model(MyModel);
    app.use(loopback.rest());
    request(app).get('/mymodels/1')
      .expect(404)
      .end(function(err, res) {
        if (err) return done(err);

        const errorResponse = res.body.error;
        assert(errorResponse);
        assert.equal(errorResponse.code, 'MODEL_NOT_FOUND');

        done();
      });
  });

  it('should report 404 for HEAD /:id not found', function(done) {
    app.model(MyModel);
    app.use(loopback.rest());
    request(app).head('/mymodels/1')
      .expect(404)
      .end(done);
  });

  it('should report 200 for GET /:id/exists not found', function(done) {
    app.model(MyModel);
    app.use(loopback.rest());
    request(app).get('/mymodels/1/exists')
      .expect(200)
      .end(function(err, res) {
        if (err) return done(err);

        expect(res.body).to.eql({exists: false});

        done();
      });
  });

  it('should report 200 for GET /:id found', function(done) {
    app.model(MyModel);
    app.use(loopback.rest());
    MyModel.create({name: 'm1'}, function(err, inst) {
      request(app).get('/mymodels/' + inst.id)
        .expect(200)
        .end(done);
    });
  });

  it('should report 200 for HEAD /:id found', function(done) {
    app.model(MyModel);
    app.use(loopback.rest());
    MyModel.create({name: 'm2'}, function(err, inst) {
      request(app).head('/mymodels/' + inst.id)
        .expect(200)
        .end(done);
    });
  });

  it('should report 200 for GET /:id/exists found', function(done) {
    app.model(MyModel);
    app.use(loopback.rest());
    MyModel.create({name: 'm2'}, function(err, inst) {
      request(app).get('/mymodels/' + inst.id + '/exists')
        .expect(200)
        .end(function(err, res) {
          if (err) return done(err);

          expect(res.body).to.eql({exists: true});

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

  it('should honour `remoting.rest.supportedTypes`', function(done) {
    const app = loopback({localRegistry: true});

    // NOTE it is crucial to set `remoting` before creating any models
    const supportedTypes = ['json', 'application/javascript', 'text/javascript'];
    app.set('remoting', {rest: {supportedTypes: supportedTypes}});

    app.model(MyModel);
    app.use(loopback.rest());

    request(app).get('/mymodels')
      .set('Accept', 'text/html,application/xml;q= 0.9,*/*;q= 0.8')
      .expect('Content-Type', 'application/json; charset=utf-8')
      .expect(200, done);
  });

  it('allows models to provide a custom HTTP path', function(done) {
    const CustomModel = app.registry.createModel('CustomModel',
      {name: String},
      {http: {'path': 'domain1/CustomModelPath'}});

    app.model(CustomModel, {dataSource: 'db'});
    app.use(loopback.rest());

    request(app).get('/domain1/CustomModelPath').expect(200).end(done);
  });

  it('should report 200 for url-encoded HTTP path', function(done) {
    const CustomModel = app.registry.createModel('CustomModel',
      {name: String},
      {http: {path: 'domain%20one/CustomModelPath'}});

    app.model(CustomModel, {dataSource: 'db'});
    app.use(loopback.rest());

    request(app).get('/domain%20one/CustomModelPath').expect(200).end(done);
  });

  it('includes loopback.token when necessary', function(done) {
    givenUserModelWithAuth();
    app.enableAuth({dataSource: 'db'});
    app.use(loopback.rest());

    givenLoggedInUser(function(err, token) {
      if (err) return done(err);
      expect(token).instanceOf(app.models.AccessToken);
      request(app).get('/users/' + token.userId)
        .set('Authorization', token.id)
        .expect(200)
        .end(done);
    }, done);
  });

  it('does not include loopback.token when auth not enabled', function(done) {
    const User = givenUserModelWithAuth();
    User.getToken = function(req, cb) {
      cb(null, req.accessToken ? req.accessToken.id : null);
    };
    loopback.remoteMethod(User.getToken, {
      accepts: [{type: 'object', http: {source: 'req'}}],
      returns: [{type: 'object', name: 'id'}],
    });

    app.use(loopback.rest());
    givenLoggedInUser(function(err, token) {
      if (err) return done(err);

      request(app).get('/users/getToken')
        .set('Authorization', token.id)
        .expect(200)
        .end(function(err, res) {
          if (err) return done(err);

          expect(res.body.id).to.equal(null);

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

  it('rebuilds REST endpoints after a model was added', () => {
    app.use(loopback.rest());

    return request(app).get('/mymodels').expect(404).then(() => {
      app.model(MyModel);

      return request(app).get('/mymodels').expect(200);
    });
  });

  it('rebuilds REST endpoints after a model was deleted', () => {
    app.model(MyModel);
    app.use(loopback.rest());

    return request(app).get('/mymodels').expect(200)
      .then(() => {
        app.deleteModelByName('MyModel');

        return request(app).get('/mymodels').expect(404);
      });
  });

  it('rebuilds REST endpoints after a remoteMethod was added', () => {
    app.model(MyModel);
    app.use(loopback.rest());

    return request(app).get('/mymodels/customMethod').expect(404)
      .then(() => {
        MyModel.customMethod = function(req, cb) {
          cb(null, true);
        };
        MyModel.remoteMethod('customMethod', {
          http: {verb: 'get'},
          accepts: [{type: 'object', http: {source: 'req'}}],
          returns: [{type: 'boolean', name: 'success'}],
        });

        return request(app).get('/mymodels/customMethod').expect(200);
      });
  });

  it('rebuilds REST endpoints after a remoteMethod was disabled', () => {
    app.model(MyModel);
    app.use(loopback.rest());
    MyModel.customMethod = function(req, cb) {
      cb(null, true);
    };
    MyModel.remoteMethod('customMethod', {
      http: {verb: 'get'},
      accepts: [{type: 'object', http: {source: 'req'}}],
      returns: [{type: 'boolean', name: 'success'}],
    });
    return request(app).get('/mymodels/customMethod').expect(200)
      .then(() => {
        MyModel.disableRemoteMethodByName('customMethod');

        return request(app).get('/mymodels/customMethod').expect(404);
      });
  });

  function givenUserModelWithAuth() {
    const AccessToken = app.registry.getModel('AccessToken');
    app.model(AccessToken, {dataSource: 'db'});
    const User = app.registry.getModel('User');
    // Speed up the password hashing algorithm for tests
    User.settings.saltWorkFactor = 4;
    app.model(User, {dataSource: 'db'});

    // NOTE(bajtos) This is puzzling to me. The built-in User & AccessToken
    // models should come with both relations already set up, i.e. the
    // following two lines should not be neccessary.
    // And it does behave that way when only tests in this file are run.
    // However, when I run the full test suite (all files), the relations
    // get broken.
    AccessToken.belongsTo(User, {as: 'user', foreignKey: 'userId'});
    User.hasMany(AccessToken, {as: 'accessTokens', foreignKey: 'userId'});

    return User;
  }

  function givenLoggedInUser(cb, done) {
    const credentials = {email: 'user@example.com', password: 'pwd'};
    const User = app.models.User;
    User.create(credentials,
      function(err, user) {
        if (err) return done(err);

        User.login(credentials, cb);
      });
  }

  describe('shared methods', function() {
    function getFixturePath(dirName) {
      return path.join(__dirname, 'fixtures/shared-methods/' + dirName +
          '/server/server.js');
    }

    describe('with specific definitions in model-config.json', function() {
      it('should not be exposed when the definition value is false',
        function(done) {
          const app = require(getFixturePath('model-config-defined-false'));
          request(app)
            .get('/todos')
            .expect(404, done);
        });

      it('should be exposed when the definition value is true', function(done) {
        const app = require(getFixturePath('model-config-defined-true'));
        request(app)
          .get('/todos')
          .expect(200, done);
      });
    });

    describe('with default definitions in model-config.json', function() {
      it('should not be exposed when the definition value is false',
        function(done) {
          const app = require(getFixturePath('model-config-default-false'));
          request(app)
            .get('/todos')
            .expect(404, done);
        });

      it('should be exposed when the definition value is true', function(done) {
        const app = require(getFixturePath('model-config-default-true'));
        app.models.Todo.create([
          {content: 'a'},
          {content: 'b'},
          {content: 'c'},
        ], function() {
          request(app)
            .del('/todos')
            .expect(200)
            .end(function(err, res) {
              if (err) return done(err);

              expect(res.body.count).to.equal(3);

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

    describe('with specific definitions in config.json', function() {
      it('should not be exposed when the definition value is false',
        function(done) {
          const app = require(getFixturePath('config-defined-false'));
          request(app)
            .get('/todos')
            .expect(404, done);
        });

      it('should be exposed when the definition value is true',
        function(done) {
          const app = require(getFixturePath('config-defined-true'));
          request(app)
            .get('/todos')
            .expect(200, done);
        });
    });

    describe('with default definitions in config.json', function() {
      it('should not be exposed when the definition value is false',
        function(done) {
          const app = require(getFixturePath('config-default-false'));
          request(app)
            .get('/todos')
            .expect(404, done);
        });

      it('should be exposed when the definition value is true', function(done) {
        const app = require(getFixturePath('config-default-true'));
        app.models.Todo.create([
          {content: 'a'},
          {content: 'b'},
          {content: 'c'},
        ], function() {
          request(app)
            .del('/todos')
            .expect(200)
            .end(function(err, res) {
              if (err) return done(err);

              expect(res.body.count).to.equal(3);

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

    // The fixture in `shared-method/both-configs-set/config.json` has `*:false`
    // set which disables the REST endpoints for built-in models such as User as
    // a side effect since tests share the same loopback instance. As a
    // consequence, this causes the tests in user.integration to fail.
    describe.skip('with definitions in both config.json and model-config.json',
      function() {
        it('should prioritize the settings in model-config.json', function(done) {
          const app = require(getFixturePath('both-configs-set'));
          request(app)
            .del('/todos')
            .expect(404, done);
        });

        it('should fall back to config.json settings if setting is not found in' +
          'model-config.json', function(done) {
          const app = require(getFixturePath('both-configs-set'));
          request(app)
            .get('/todos')
            .expect(404, done);
        });
      });
  });
});