// Copyright IBM Corp. 2013,2016. All Rights Reserved.
// Node module: loopback
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT

var loopback = require('../');
var lt = require('./helpers/loopback-testing-helper');
var path = require('path');
var SIMPLE_APP = path.join(__dirname, 'fixtures', 'simple-integration-app');
var app = require(path.join(SIMPLE_APP, 'server/server.js'));
var assert = require('assert');
var expect = require('chai').expect;
var debug = require('debug')('loopback:test:relations.integration');
var async = require('async');

describe('relations - integration', function() {
  lt.beforeEach.withApp(app);

  lt.beforeEach.givenModel('store');
  beforeEach(function(done) {
    this.widgetName = 'foo';
    this.store.widgets.create({
      name: this.widgetName,
    }, function() {
      done();
    });
  });
  afterEach(function(done) {
    this.app.models.widget.destroyAll(done);
  });

  describe('polymorphicHasMany', function() {
    before(function defineProductAndCategoryModels() {
      var Team = app.registry.createModel('Team', { name: 'string' });
      var Reader = app.registry.createModel('Reader', { name: 'string' });
      var Picture = app.registry.createModel('Picture',
        { name: 'string', imageableId: 'number', imageableType: 'string' });

      app.model(Team, { dataSource: 'db' });
      app.model(Reader, { dataSource: 'db' });
      app.model(Picture, { dataSource: 'db' });

      Reader.hasMany(Picture, { polymorphic: { // alternative syntax
        as: 'imageable', // if not set, default to: reference
        foreignKey: 'imageableId', // defaults to 'as + Id'
        discriminator: 'imageableType', // defaults to 'as + Type'
      }});

      Picture.belongsTo('imageable', { polymorphic: {
        foreignKey: 'imageableId',
        discriminator: 'imageableType',
      }});

      Reader.belongsTo(Team);
    });

    before(function createEvent(done) {
      var test = this;
      app.models.Team.create({ name: 'Team 1' },
        function(err, team) {
          if (err) return done(err);

          test.team = team;
          app.models.Reader.create({ name: 'Reader 1' },
          function(err, reader) {
            if (err) return done(err);

            test.reader = reader;
            reader.pictures.create({ name: 'Picture 1' });
            reader.pictures.create({ name: 'Picture 2' });
            reader.team(test.team);
            reader.save(done);
          });
        }
      );
    });

    after(function(done) {
      this.app.models.Reader.destroyAll(done);
    });

    it('includes the related child model', function(done) {
      var url = '/api/readers/' + this.reader.id;
      this.get(url)
        .query({ 'filter': { 'include': 'pictures' }})
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body.name).to.be.equal('Reader 1');
          expect(res.body.pictures).to.be.eql([
            { name: 'Picture 1', id: 1, imageableId: 1, imageableType: 'Reader' },
            { name: 'Picture 2', id: 2, imageableId: 1, imageableType: 'Reader' },
          ]);

          done();
        });
    });

    it('includes the related parent model', function(done) {
      var url = '/api/pictures';
      this.get(url)
        .query({ 'filter': { 'include': 'imageable' }})
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body[0].name).to.be.equal('Picture 1');
          expect(res.body[1].name).to.be.equal('Picture 2');
          expect(res.body[0].imageable).to.be.eql({ name: 'Reader 1', id: 1, teamId: 1 });

          done();
        });
    });

    it('includes related models scoped to the related parent model', function(done) {
      var url = '/api/pictures';
      this.get(url)
        .query({ 'filter': { 'include': {
          'relation': 'imageable',
          'scope': { 'include': 'team' },
        }}})
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body[0].name).to.be.equal('Picture 1');
          expect(res.body[1].name).to.be.equal('Picture 2');
          expect(res.body[0].imageable.name).to.be.eql('Reader 1');
          expect(res.body[0].imageable.team).to.be.eql({ name: 'Team 1', id: 1 });

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

  describe('/store/superStores', function() {
    it('should invoke scoped methods remotely', function(done) {
      this.get('/api/stores/superStores')
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.array;

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

  describe('/store/:id/widgets', function() {
    beforeEach(function() {
      this.url = '/api/stores/' + this.store.id + '/widgets';
    });
    lt.describe.whenCalledRemotely('GET', '/api/stores/:id/widgets', function() {
      it('should succeed with statusCode 200', function() {
        assert.equal(this.res.statusCode, 200);
      });
      describe('widgets (response.body)', function() {
        beforeEach(function() {
          debug('GET /api/stores/:id/widgets response: %s' +
              '\nheaders: %j\nbody string: %s',
            this.res.statusCode,
            this.res.headers,
            this.res.text);
          this.widgets = this.res.body;
          this.widget = this.res.body && this.res.body[0];
        });
        it('should be an array', function() {
          assert(Array.isArray(this.widgets));
        });
        it('should include a single widget', function() {
          assert(this.widgets.length === 1);
          assert(this.widget);
        });
        it('should be a valid widget', function() {
          assert(this.widget.id);
          assert.equal(this.widget.storeId, this.store.id);
          assert.equal(this.widget.name, this.widgetName);
        });
      });
    });
    describe('POST /api/store/:id/widgets', function() {
      beforeEach(function() {
        this.newWidgetName = 'baz';
        this.newWidget = {
          name: this.newWidgetName,
        };
      });
      beforeEach(function(done) {
        this.http = this.post(this.url, this.newWidget);
        this.http.send(this.newWidget);
        this.http.end(function(err) {
          if (err) return done(err);

          this.req = this.http.req;
          this.res = this.http.res;

          done();
        }.bind(this));
      });
      it('should succeed with statusCode 200', function() {
        assert.equal(this.res.statusCode, 200);
      });
      describe('widget (response.body)', function() {
        beforeEach(function() {
          this.widget = this.res.body;
        });
        it('should be an object', function() {
          assert(typeof this.widget === 'object');
          assert(!Array.isArray(this.widget));
        });
        it('should be a valid widget', function() {
          assert(this.widget.id);
          assert.equal(this.widget.storeId, this.store.id);
          assert.equal(this.widget.name, this.newWidgetName);
        });
      });
      it('should have a single widget with storeId', function(done) {
        this.app.models.widget.count({
          storeId: this.store.id,
        }, function(err, count) {
          if (err) return done(err);

          assert.equal(count, 2);

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

    describe('PUT /api/store/:id/widgets/:fk', function() {
      beforeEach(function(done) {
        var self = this;
        this.store.widgets.create({
          name: this.widgetName,
        }, function(err, widget) {
          self.widget = widget;
          self.url = '/api/stores/' + self.store.id + '/widgets/' + widget.id;
          done();
        });
      });
      it('does not add default properties to request body', function(done) {
        var self = this;
        self.request.put(self.url)
          .send({ active: true })
          .end(function(err) {
            if (err) return done(err);
            app.models.Widget.findById(self.widget.id, function(err, w) {
              if (err) return done(err);
              expect(w.name).to.equal(self.widgetName);
              done();
            });
          });
      });
    });
  });

  describe('/stores/:id/widgets/:fk - 200', function() {
    beforeEach(function(done) {
      var self = this;
      this.store.widgets.create({
        name: this.widgetName,
      }, function(err, widget) {
        self.widget = widget;
        self.url = '/api/stores/' + self.store.id + '/widgets/' + widget.id;

        done();
      });
    });
    lt.describe.whenCalledRemotely('GET', '/stores/:id/widgets/:fk', function() {
      it('should succeed with statusCode 200', function() {
        assert.equal(this.res.statusCode, 200);
        assert.equal(this.res.body.id, this.widget.id);
      });
    });
  });

  describe('/stores/:id/widgets/:fk - 404', function() {
    beforeEach(function() {
      this.url = '/api/stores/' + this.store.id + '/widgets/123456';
    });
    lt.describe.whenCalledRemotely('GET', '/stores/:id/widgets/:fk', function() {
      it('should fail with statusCode 404', function() {
        assert.equal(this.res.statusCode, 404);
        assert.equal(this.res.body.error.statusCode, 404);
      });
    });
  });

  describe('/store/:id/widgets/count', function() {
    beforeEach(function() {
      this.url = '/api/stores/' + this.store.id + '/widgets/count';
    });
    lt.describe.whenCalledRemotely('GET', '/api/stores/:id/widgets/count', function() {
      it('should succeed with statusCode 200', function() {
        assert.equal(this.res.statusCode, 200);
      });
      it('should return the count', function() {
        assert.equal(this.res.body.count, 1);
      });
    });
  });

  describe('/store/:id/widgets/count - filtered (matches)', function() {
    beforeEach(function() {
      this.url = '/api/stores/' + this.store.id + '/widgets/count?where[name]=foo';
    });
    lt.describe.whenCalledRemotely('GET', '/api/stores/:id/widgets/count?where[name]=foo', function() {
      it('should succeed with statusCode 200', function() {
        assert.equal(this.res.statusCode, 200);
      });
      it('should return the count', function() {
        assert.equal(this.res.body.count, 1);
      });
    });
  });

  describe('/store/:id/widgets/count - filtered (no matches)', function() {
    beforeEach(function() {
      this.url = '/api/stores/' + this.store.id + '/widgets/count?where[name]=bar';
    });
    lt.describe.whenCalledRemotely('GET', '/api/stores/:id/widgets/count?where[name]=bar', function() {
      it('should succeed with statusCode 200', function() {
        assert.equal(this.res.statusCode, 200);
      });
      it('should return the count', function() {
        assert.equal(this.res.body.count, 0);
      });
    });
  });

  describe('/widgets/:id/store', function() {
    beforeEach(function(done) {
      var self = this;
      this.store.widgets.create({
        name: this.widgetName,
      }, function(err, widget) {
        self.widget = widget;
        self.url = '/api/widgets/' + self.widget.id + '/store';

        done();
      });
    });
    lt.describe.whenCalledRemotely('GET', '/api/widgets/:id/store', function() {
      it('should succeed with statusCode 200', function() {
        assert.equal(this.res.statusCode, 200);
        assert.equal(this.res.body.id, this.store.id);
      });
    });
  });

  describe('hasMany through', function() {
    function setup(connecting, cb) {
      var root = {};

      async.series([
        // Clean up models
        function(done) {
          app.models.physician.destroyAll(function(err) {
            app.models.patient.destroyAll(function(err) {
              app.models.appointment.destroyAll(function(err) {
                done();
              });
            });
          });
        },

        // Create a physician
        function(done) {
          app.models.physician.create({
            name: 'ph1',
          }, function(err, physician) {
            root.physician = physician;

            done();
          });
        },

        // Create a patient
        connecting ? function(done) {
          root.physician.patients.create({
            name: 'pa1',
          }, function(err, patient) {
            root.patient = patient;
            root.relUrl = '/api/physicians/' + root.physician.id +
              '/patients/rel/' + root.patient.id;

            done();
          });
        } : function(done) {
          app.models.patient.create({
            name: 'pa1',
          }, function(err, patient) {
            root.patient = patient;
            root.relUrl = '/api/physicians/' + root.physician.id +
              '/patients/rel/' + root.patient.id;

            done();
          });
        }], function(err, done) {
        cb(err, root);
      });
    }

    describe('PUT /physicians/:id/patients/rel/:fk', function() {
      before(function(done) {
        var self = this;
        setup(false, function(err, root) {
          self.url = root.relUrl;
          self.patient = root.patient;
          self.physician = root.physician;

          done(err);
        });
      });

      lt.describe.whenCalledRemotely('PUT', '/api/physicians/:id/patients/rel/:fk', function() {
        it('should succeed with statusCode 200', function() {
          assert.equal(this.res.statusCode, 200);
          assert.equal(this.res.body.patientId, this.patient.id);
          assert.equal(this.res.body.physicianId, this.physician.id);
        });

        it('should create a record in appointment', function(done) {
          var self = this;
          app.models.appointment.find(function(err, apps) {
            assert.equal(apps.length, 1);
            assert.equal(apps[0].patientId, self.patient.id);

            done();
          });
        });

        it('should connect physician to patient', function(done) {
          var self = this;
          self.physician.patients(function(err, patients) {
            assert.equal(patients.length, 1);
            assert.equal(patients[0].id, self.patient.id);

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

    describe('PUT /physicians/:id/patients/rel/:fk with data', function() {
      before(function(done) {
        var self = this;
        setup(false, function(err, root) {
          self.url = root.relUrl;
          self.patient = root.patient;
          self.physician = root.physician;

          done(err);
        });
      });

      var NOW = Date.now();
      var data = { date: new Date(NOW) };

      lt.describe.whenCalledRemotely('PUT', '/api/physicians/:id/patients/rel/:fk', data, function() {
        it('should succeed with statusCode 200', function() {
          assert.equal(this.res.statusCode, 200);
          assert.equal(this.res.body.patientId, this.patient.id);
          assert.equal(this.res.body.physicianId, this.physician.id);
          assert.equal(new Date(this.res.body.date).getTime(), NOW);
        });

        it('should create a record in appointment', function(done) {
          var self = this;
          app.models.appointment.find(function(err, apps) {
            assert.equal(apps.length, 1);
            assert.equal(apps[0].patientId, self.patient.id);
            assert.equal(apps[0].physicianId, self.physician.id);
            assert.equal(apps[0].date.getTime(), NOW);

            done();
          });
        });

        it('should connect physician to patient', function(done) {
          var self = this;
          self.physician.patients(function(err, patients) {
            assert.equal(patients.length, 1);
            assert.equal(patients[0].id, self.patient.id);

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

    describe('HEAD /physicians/:id/patients/rel/:fk', function() {
      before(function(done) {
        var self = this;
        setup(true, function(err, root) {
          self.url = root.relUrl;
          self.patient = root.patient;
          self.physician = root.physician;

          done(err);
        });
      });

      lt.describe.whenCalledRemotely('HEAD', '/api/physicians/:id/patients/rel/:fk', function() {
        it('should succeed with statusCode 200', function() {
          assert.equal(this.res.statusCode, 200);
        });
      });
    });

    describe('HEAD /physicians/:id/patients/rel/:fk that does not exist', function() {
      before(function(done) {
        var self = this;
        setup(true, function(err, root) {
          self.url = '/api/physicians/' + root.physician.id +
            '/patients/rel/' + '999';
          self.patient = root.patient;
          self.physician = root.physician;

          done(err);
        });
      });

      lt.describe.whenCalledRemotely('HEAD', '/api/physicians/:id/patients/rel/:fk', function() {
        it('should succeed with statusCode 404', function() {
          assert.equal(this.res.statusCode, 404);
        });
      });
    });

    describe('DELETE /physicians/:id/patients/rel/:fk', function() {
      before(function(done) {
        var self = this;
        setup(true, function(err, root) {
          self.url = root.relUrl;
          self.patient = root.patient;
          self.physician = root.physician;

          done(err);
        });
      });

      it('should create a record in appointment', function(done) {
        var self = this;
        app.models.appointment.find(function(err, apps) {
          assert.equal(apps.length, 1);
          assert.equal(apps[0].patientId, self.patient.id);

          done();
        });
      });

      it('should connect physician to patient', function(done) {
        var self = this;
        self.physician.patients(function(err, patients) {
          assert.equal(patients.length, 1);
          assert.equal(patients[0].id, self.patient.id);

          done();
        });
      });

      lt.describe.whenCalledRemotely('DELETE', '/api/physicians/:id/patients/rel/:fk', function() {
        it('should succeed with statusCode 204', function() {
          assert.equal(this.res.statusCode, 204);
        });

        it('should remove the record in appointment', function(done) {
          var self = this;
          app.models.appointment.find(function(err, apps) {
            assert.equal(apps.length, 0);

            done();
          });
        });

        it('should remove the connection between physician and patient', function(done) {
          var self = this;
          // Need to refresh the cache
          self.physician.patients(true, function(err, patients) {
            assert.equal(patients.length, 0);

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

    describe('GET /physicians/:id/patients/:fk', function() {
      before(function(done) {
        var self = this;
        setup(true, function(err, root) {
          self.url = '/api/physicians/' + root.physician.id +
            '/patients/' + root.patient.id;
          self.patient = root.patient;
          self.physician = root.physician;

          done(err);
        });
      });

      lt.describe.whenCalledRemotely('GET', '/api/physicians/:id/patients/:fk', function() {
        it('should succeed with statusCode 200', function() {
          assert.equal(this.res.statusCode, 200);
          assert.equal(this.res.body.id, this.physician.id);
        });
      });
    });

    describe('DELETE /physicians/:id/patients/:fk', function() {
      before(function(done) {
        var self = this;
        setup(true, function(err, root) {
          self.url = '/api/physicians/' + root.physician.id +
            '/patients/' + root.patient.id;
          self.patient = root.patient;
          self.physician = root.physician;

          done(err);
        });
      });

      lt.describe.whenCalledRemotely('DELETE', '/api/physicians/:id/patients/:fk', function() {
        it('should succeed with statusCode 204', function() {
          assert.equal(this.res.statusCode, 204);
        });

        it('should remove the record in appointment', function(done) {
          var self = this;
          app.models.appointment.find(function(err, apps) {
            assert.equal(apps.length, 0);

            done();
          });
        });

        it('should remove the connection between physician and patient', function(done) {
          var self = this;
          // Need to refresh the cache
          self.physician.patients(true, function(err, patients) {
            assert.equal(patients.length, 0);

            done();
          });
        });

        it('should remove the record in patient', function(done) {
          var self = this;
          app.models.patient.find(function(err, patients) {
            assert.equal(patients.length, 0);

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

  describe('hasAndBelongsToMany', function() {
    beforeEach(function defineProductAndCategoryModels() {
      var product = app.registry.createModel(
         'product',
         { id: 'string', name: 'string' }
      );
      var category = app.registry.createModel(
        'category',
        { id: 'string', name: 'string' }
      );
      app.model(product, { dataSource: 'db' });
      app.model(category, { dataSource: 'db' });

      product.hasAndBelongsToMany(category);
      category.hasAndBelongsToMany(product);
    });

    lt.beforeEach.givenModel('category');

    beforeEach(function createProductsInCategory(done) {
      var test = this;
      this.category.products.create({
        name: 'a-product',
      }, function(err, product) {
        if (err) return done(err);

        test.product = product;

        done();
      });
    });

    beforeEach(function createAnotherCategoryAndProduct(done) {
      app.models.category.create({ name: 'another-category' },
        function(err, cat) {
          if (err) return done(err);

          cat.products.create({ name: 'another-product' }, done);
        });
    });

    afterEach(function(done) {
      this.app.models.product.destroyAll(done);
    });

    it.skip('allows to find related objects via where filter', function(done) {
      //TODO https://github.com/strongloop/loopback-datasource-juggler/issues/94
      var expectedProduct = this.product;
      this.get('/api/products?filter[where][categoryId]=' + this.category.id)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.eql([
            {
              id: expectedProduct.id,
              name: expectedProduct.name,
            },
          ]);

          done();
        });
    });

    it('allows to find related object via URL scope', function(done) {
      var expectedProduct = this.product;
      this.get('/api/categories/' + this.category.id + '/products')
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.eql([
            {
              id: expectedProduct.id,
              name: expectedProduct.name,
            },
          ]);

          done();
        });
    });

    it('includes requested related models in `find`', function(done) {
      var expectedProduct = this.product;
      var url = '/api/categories/findOne?filter[where][id]=' +
        this.category.id + '&filter[include]=products';

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.have.property('products');
          expect(res.body.products).to.eql([
            {
              id: expectedProduct.id,
              name: expectedProduct.name,
            },
          ]);

          done();
        });
    });

    it.skip('includes requested related models in `findById`', function(done) {
      //TODO https://github.com/strongloop/loopback-datasource-juggler/issues/93
      var expectedProduct = this.product;
      // Note: the URL format is not final
      var url = '/api/categories/' + this.category.id + '?include=products';

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.have.property('products');
          expect(res.body.products).to.eql([
            {
              id: expectedProduct.id,
              name: expectedProduct.name,
            },
          ]);

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

  describe('embedsOne', function() {
    before(function defineGroupAndPosterModels() {
      var group = app.registry.createModel('group',
        { name: 'string' },
        { plural: 'groups' }
      );
      app.model(group, { dataSource: 'db' });

      var poster = app.registry.createModel(
        'poster',
        { url: 'string' }
      );
      app.model(poster, { dataSource: 'db' });

      group.embedsOne(poster, { as: 'cover' });
    });

    before(function createImage(done) {
      var test = this;
      app.models.group.create({ name: 'Group 1' },
        function(err, group) {
          if (err) return done(err);

          test.group = group;

          done();
        });
    });

    after(function(done) {
      this.app.models.group.destroyAll(done);
    });

    it('creates an embedded model', function(done) {
      var url = '/api/groups/' + this.group.id + '/cover';

      this.post(url)
        .send({ url: 'http://image.url' })
        .expect(200, function(err, res) {
          expect(res.body).to.be.eql(
            { url: 'http://image.url' }
          );

          done();
        });
    });

    it('includes the embedded models', function(done) {
      var url = '/api/groups/' + this.group.id;

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body.name).to.be.equal('Group 1');
          expect(res.body.poster).to.be.eql(
            { url: 'http://image.url' }
          );

          done();
        });
    });

    it('returns the embedded model', function(done) {
      var url = '/api/groups/' + this.group.id + '/cover';

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql(
            { url: 'http://image.url' }
          );

          done();
        });
    });

    it('updates an embedded model', function(done) {
      var url = '/api/groups/' + this.group.id + '/cover';

      this.put(url)
        .send({ url: 'http://changed.url' })
        .expect(200, function(err, res) {
          expect(res.body.url).to.be.equal('http://changed.url');

          done();
        });
    });

    it('returns the updated embedded model', function(done) {
      var url = '/api/groups/' + this.group.id + '/cover';

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql(
            { url: 'http://changed.url' }
          );

          done();
        });
    });

    it('deletes an embedded model', function(done) {
      var url = '/api/groups/' + this.group.id + '/cover';
      this.del(url).expect(204, done);
    });

    it('deleted the embedded model', function(done) {
      var url = '/api/groups/' + this.group.id + '/cover';
      this.get(url).expect(404, done);
    });
  });

  describe('embedsMany', function() {
    before(function defineProductAndCategoryModels() {
      var todoList = app.registry.createModel(
        'todoList',
        { name: 'string' },
        { plural: 'todo-lists' }
      );
      app.model(todoList, { dataSource: 'db' });

      var todoItem = app.registry.createModel(
        'todoItem',
        { content: 'string' }, { forceId: false }
      );
      app.model(todoItem, { dataSource: 'db' });

      todoList.embedsMany(todoItem, { as: 'items' });
    });

    before(function createTodoList(done) {
      var test = this;
      app.models.todoList.create({ name: 'List A' },
        function(err, list) {
          if (err) return done(err);

          test.todoList = list;
          list.items.build({ content: 'Todo 1' });
          list.items.build({ content: 'Todo 2' });
          list.save(done);
        });
    });

    after(function(done) {
      this.app.models.todoList.destroyAll(done);
    });

    it('includes the embedded models', function(done) {
      var url = '/api/todo-lists/' + this.todoList.id;

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body.name).to.be.equal('List A');
          expect(res.body.todoItems).to.be.eql([
            { content: 'Todo 1', id: 1 },
            { content: 'Todo 2', id: 2 },
          ]);

          done();
        });
    });

    it('returns the embedded models', function(done) {
      var url = '/api/todo-lists/' + this.todoList.id + '/items';

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql([
            { content: 'Todo 1', id: 1 },
            { content: 'Todo 2', id: 2 },
          ]);

          done();
        });
    });

    it('filters the embedded models', function(done) {
      var url = '/api/todo-lists/' + this.todoList.id + '/items';
      url += '?filter[where][id]=2';

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql([
            { content: 'Todo 2', id: 2 },
          ]);

          done();
        });
    });

    it('creates embedded models', function(done) {
      var url = '/api/todo-lists/' + this.todoList.id + '/items';

      var expected = { content: 'Todo 3', id: 3 };

      this.post(url)
        .send({ content: 'Todo 3' })
        .expect(200, function(err, res) {
          expect(res.body).to.be.eql(expected);

          done();
        });
    });

    it('returns the embedded models', function(done) {
      var url = '/api/todo-lists/' + this.todoList.id + '/items';

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql([
            { content: 'Todo 1', id: 1 },
            { content: 'Todo 2', id: 2 },
            { content: 'Todo 3', id: 3 },
          ]);

          done();
        });
    });

    it('returns an embedded model by (internal) id', function(done) {
      var url = '/api/todo-lists/' + this.todoList.id + '/items/3';

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql(
            { content: 'Todo 3', id: 3 }
          );

          done();
        });
    });

    it('removes an embedded model', function(done) {
      var expectedProduct = this.product;
      var url = '/api/todo-lists/' + this.todoList.id + '/items/2';

      this.del(url)
        .expect(200, function(err, res) {
          done();
        });
    });

    it('returns the embedded models - verify', function(done) {
      var url = '/api/todo-lists/' + this.todoList.id + '/items';

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql([
            { content: 'Todo 1', id: 1 },
            { content: 'Todo 3', id: 3 },
          ]);

          done();
        });
    });

    it('returns a 404 response when embedded model is not found', function(done) {
      var url = '/api/todo-lists/' + this.todoList.id + '/items/2';
      this.get(url).expect(404, function(err, res) {
        if (err) return done(err);

        expect(res.body.error.status).to.be.equal(404);
        expect(res.body.error.message).to.be.equal('Unknown "todoItem" id "2".');
        expect(res.body.error.code).to.be.equal('MODEL_NOT_FOUND');

        done();
      });
    });

    it.skip('checks if an embedded model exists - ok', function(done) {
      var url = '/api/todo-lists/' + this.todoList.id + '/items/3';

      this.head(url)
        .expect(200, function(err, res) {
          done();
        });
    });

    it.skip('checks if an embedded model exists - fail', function(done) {
      var url = '/api/todo-lists/' + this.todoList.id + '/items/2';

      this.head(url)
        .expect(404, function(err, res) {
          done();
        });
    });
  });

  describe('referencesMany', function() {
    before(function defineProductAndCategoryModels() {
      var recipe = app.registry.createModel(
        'recipe',
        { name: 'string' }
      );
      app.model(recipe, { dataSource: 'db' });

      var ingredient = app.registry.createModel(
        'ingredient',
       { name: 'string' }
      );
      app.model(ingredient, { dataSource: 'db' });

      var photo = app.registry.createModel(
        'photo',
        { name: 'string' }
      );
      app.model(photo, { dataSource: 'db' });

      recipe.referencesMany(ingredient);
      // contrived example for test:
      recipe.hasOne(photo, { as: 'picture', options: {
        http: { path: 'image' },
      }});
    });

    before(function createRecipe(done) {
      var test = this;
      app.models.recipe.create({ name: 'Recipe' },
        function(err, recipe) {
          if (err) return done(err);

          test.recipe = recipe;
          recipe.ingredients.create({
            name: 'Chocolate' },
          function(err, ing) {
            test.ingredient1 = ing.id;
            recipe.picture.create({ name: 'Photo 1' }, done);
          });
        });
    });

    before(function createIngredient(done) {
      var test = this;
      app.models.ingredient.create({ name: 'Sugar' }, function(err, ing) {
        test.ingredient2 = ing.id;

        done();
      });
    });

    after(function(done) {
      var app = this.app;
      app.models.recipe.destroyAll(function() {
        app.models.ingredient.destroyAll(function() {
          app.models.photo.destroyAll(done);
        });
      });
    });

    it('keeps an array of ids', function(done) {
      var url = '/api/recipes/' + this.recipe.id;
      var test = this;

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body.ingredientIds).to.eql([test.ingredient1]);
          expect(res.body).to.not.have.property('ingredients');

          done();
        });
    });

    it('creates referenced models', function(done) {
      var url = '/api/recipes/' + this.recipe.id + '/ingredients';
      var test = this;

      this.post(url)
        .send({ name: 'Butter' })
        .expect(200, function(err, res) {
          expect(res.body.name).to.be.eql('Butter');
          test.ingredient3 = res.body.id;

          done();
        });
    });

    it('has created models', function(done) {
      var url = '/api/ingredients';
      var test = this;

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql([
            { name: 'Chocolate', id: test.ingredient1 },
            { name: 'Sugar', id: test.ingredient2 },
            { name: 'Butter', id: test.ingredient3 },
          ]);

          done();
        });
    });

    it('returns the referenced models', function(done) {
      var url = '/api/recipes/' + this.recipe.id + '/ingredients';
      var test = this;

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql([
            { name: 'Chocolate', id: test.ingredient1 },
            { name: 'Butter', id: test.ingredient3 },
          ]);

          done();
        });
    });

    it('filters the referenced models', function(done) {
      var url = '/api/recipes/' + this.recipe.id + '/ingredients';
      url += '?filter[where][name]=Butter';
      var test = this;

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql([
            { name: 'Butter', id: test.ingredient3 },
          ]);

          done();
        });
    });

    it('includes the referenced models', function(done) {
      var url = '/api/recipes/findOne?filter[where][id]=' + this.recipe.id;
      url += '&filter[include]=ingredients';
      var test = this;

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body.ingredientIds).to.eql([
            test.ingredient1, test.ingredient3,
          ]);
          expect(res.body.ingredients).to.eql([
            { name: 'Chocolate', id: test.ingredient1 },
            { name: 'Butter', id: test.ingredient3 },
          ]);

          done();
        });
    });

    it('returns a referenced model by id', function(done) {
      var url = '/api/recipes/' + this.recipe.id + '/ingredients/';
      url += this.ingredient3;
      var test = this;

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql(
            { name: 'Butter', id: test.ingredient3 }
          );

          done();
        });
    });

    it('keeps an array of ids - verify', function(done) {
      var url = '/api/recipes/' + this.recipe.id;
      var test = this;

      var expected = [test.ingredient1, test.ingredient3];

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body.ingredientIds).to.eql(expected);
          expect(res.body).to.not.have.property('ingredients');

          done();
        });
    });

    it('destroys a referenced model', function(done) {
      var expectedProduct = this.product;
      var url = '/api/recipes/' + this.recipe.id + '/ingredients/';
      url += this.ingredient3;

      this.del(url)
        .expect(200, function(err, res) {
          done();
        });
    });

    it('has destroyed a referenced model', function(done) {
      var url = '/api/ingredients';
      var test = this;

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql([
            { name: 'Chocolate', id: test.ingredient1 },
            { name: 'Sugar', id: test.ingredient2 },
          ]);

          done();
        });
    });

    it('returns the referenced models - verify', function(done) {
      var url = '/api/recipes/' + this.recipe.id + '/ingredients';
      var test = this;

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql([
            { name: 'Chocolate', id: test.ingredient1 },
          ]);

          done();
        });
    });

    it('creates/links a reference by id', function(done) {
      var url = '/api/recipes/' + this.recipe.id + '/ingredients';
      url += '/rel/' + this.ingredient2;
      var test = this;

      this.put(url)
        .expect(200, function(err, res) {
          expect(res.body).to.be.eql(
            { name: 'Sugar', id: test.ingredient2 }
          );

          done();
        });
    });

    it('returns the referenced models - verify', function(done) {
      var url = '/api/recipes/' + this.recipe.id + '/ingredients';
      var test = this;

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql([
            { name: 'Chocolate', id: test.ingredient1 },
            { name: 'Sugar', id: test.ingredient2 },
          ]);

          done();
        });
    });

    it('removes/unlinks a reference by id', function(done) {
      var url = '/api/recipes/' + this.recipe.id + '/ingredients';
      url += '/rel/' + this.ingredient1;
      var test = this;

      this.del(url)
        .expect(200, function(err, res) {
          done();
        });
    });

    it('returns the referenced models - verify', function(done) {
      var url = '/api/recipes/' + this.recipe.id + '/ingredients';
      var test = this;

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql([
            { name: 'Sugar', id: test.ingredient2 },
          ]);

          done();
        });
    });

    it('has not destroyed an unlinked model', function(done) {
      var url = '/api/ingredients';
      var test = this;

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.eql([
            { name: 'Chocolate', id: test.ingredient1 },
            { name: 'Sugar', id: test.ingredient2 },
          ]);

          done();
        });
    });

    it('uses a custom relation path', function(done) {
      var url = '/api/recipes/' + this.recipe.id + '/image';

      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(err).to.not.exist;
          expect(res.body.name).to.equal('Photo 1');

          done();
        });
    });

    it.skip('checks if a referenced model exists - ok', function(done) {
      var url = '/api/recipes/' + this.recipe.id + '/ingredients/';
      url += this.ingredient1;

      this.head(url)
        .expect(200, function(err, res) {
          done();
        });
    });

    it.skip('checks if an referenced model exists - fail', function(done) {
      var url = '/api/recipes/' + this.recipe.id + '/ingredients/';
      url += this.ingredient3;

      this.head(url)
        .expect(404, function(err, res) {
          done();
        });
    });
  });

  describe('nested relations', function() {
    before(function defineModels() {
      var Book = app.registry.createModel(
        'Book',
        { name: 'string' },
        { plural: 'books' }
      );
      app.model(Book, { dataSource: 'db' });

      var Page = app.registry.createModel(
        'Page',
        { name: 'string' },
        { plural: 'pages' }
      );
      app.model(Page, { dataSource: 'db' });

      var Image = app.registry.createModel(
        'Image',
        { name: 'string' },
        { plural: 'images' }
      );
      app.model(Image, { dataSource: 'db' });

      var Note = app.registry.createModel(
        'Note',
        { text: 'string' },
        { plural: 'notes' }
      );
      app.model(Note, { dataSource: 'db' });

      var Chapter = app.registry.createModel(
        'Chapter',
        { name: 'string' },
        { plural: 'chapters' }
      );
      app.model(Chapter, { dataSource: 'db' });

      Book.hasMany(Page);
      Book.hasMany(Chapter);
      Page.hasMany(Note);
      Chapter.hasMany(Note);
      Image.belongsTo(Book);

      // fake a remote method that match the filter in Model.nestRemoting()
      Page.prototype['__throw__errors'] = function() {
        throw new Error('This should not crash the app');
      };

      Page.remoteMethod('__throw__errors', { isStatic: false, http: { path: '/throws', verb: 'get' }});

      Book.nestRemoting('pages');
      Book.nestRemoting('chapters');
      Image.nestRemoting('book');

      expect(Book.prototype['__findById__pages__notes']).to.be.a.function;
      expect(Image.prototype['__findById__book__pages']).to.be.a.function;

      Page.beforeRemote('prototype.__findById__notes', function(ctx, result, next) {
        ctx.res.set('x-before', 'before');

        next();
      });

      Page.afterRemote('prototype.__findById__notes', function(ctx, result, next) {
        ctx.res.set('x-after', 'after');

        next();
      });
    });

    before(function createBook(done) {
      var test = this;
      app.models.Book.create({ name: 'Book 1' },
        function(err, book) {
          if (err) return done(err);

          test.book = book;
          book.pages.create({ name: 'Page 1' },
          function(err, page) {
            if (err) return done(err);

            test.page = page;
            page.notes.create({ text: 'Page Note 1' },
            function(err, note) {
              test.note = note;

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

    before(function createChapters(done) {
      var test = this;
      test.book.chapters.create({ name: 'Chapter 1' },
        function(err, chapter) {
          if (err) return done(err);

          test.chapter = chapter;
          chapter.notes.create({ text: 'Chapter Note 1' }, function(err, note) {
            test.cnote = note;

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

    before(function createCover(done) {
      var test = this;
      app.models.Image.create({ name: 'Cover 1', book: test.book },
        function(err, image) {
          if (err) return done(err);

          test.image = image;

          done();
        });
    });

    it('has regular relationship routes - pages', function(done) {
      var test = this;
      this.get('/api/books/' + test.book.id + '/pages')
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.an.array;
          expect(res.body).to.have.length(1);
          expect(res.body[0].name).to.equal('Page 1');

          done();
        });
    });

    it('has regular relationship routes - notes', function(done) {
      var test = this;
      this.get('/api/pages/' + test.page.id + '/notes/' + test.note.id)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.headers['x-before']).to.equal('before');
          expect(res.headers['x-after']).to.equal('after');
          expect(res.body).to.be.an.object;
          expect(res.body.text).to.equal('Page Note 1');

          done();
        });
    });

    it('has a basic error handler', function(done) {
      var test = this;
      this.get('/api/books/unknown/pages/' + test.page.id + '/notes')
        .expect(404, function(err, res) {
          if (err) return done(err);

          expect(res.body.error).to.be.an.object;
          var expected = 'could not find a model with id unknown';
          expect(res.body.error.message).to.equal(expected);
          expect(res.body.error.code).to.be.equal('MODEL_NOT_FOUND');

          done();
        });
    });

    it('enables nested relationship routes - belongsTo find', function(done) {
      var test = this;
      this.get('/api/images/' + test.image.id + '/book/pages')
        .end(function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.an.array;
          expect(res.body).to.have.length(1);
          expect(res.body[0].name).to.equal('Page 1');

          done();
        });
    });

    it('enables nested relationship routes - belongsTo findById', function(done) {
      var test = this;
      this.get('/api/images/' + test.image.id + '/book/pages/' + test.page.id)
        .end(function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.an.object;
          expect(res.body.name).to.equal('Page 1');

          done();
        });
    });

    it('enables nested relationship routes - hasMany find', function(done) {
      var test = this;
      this.get('/api/books/' + test.book.id + '/pages/' + test.page.id + '/notes')
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.an.array;
          expect(res.body).to.have.length(1);
          expect(res.body[0].text).to.equal('Page Note 1');

          done();
        });
    });

    it('enables nested relationship routes - hasMany findById', function(done) {
      var test = this;
      this.get('/api/books/' + test.book.id + '/pages/' + test.page.id + '/notes/' + test.note.id)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.headers['x-before']).to.equal('before');
          expect(res.headers['x-after']).to.equal('after');
          expect(res.body).to.be.an.object;
          expect(res.body.text).to.equal('Page Note 1');

          done();
        });
    });

    it('should nest remote hooks of ModelTo - hasMany findById', function(done) {
      var test = this;
      this.get('/api/books/' + test.book.id + '/chapters/' + test.chapter.id + '/notes/' + test.cnote.id)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.headers['x-before']).to.empty;
          expect(res.headers['x-after']).to.empty;

          done();
        });
    });

    it('should have proper http.path for remoting', function() {
      [app.models.Book, app.models.Image].forEach(function(Model) {
        Model.sharedClass.methods().forEach(function(method) {
          var http = Array.isArray(method.http) ? method.http : [method.http];
          http.forEach(function(opt) {
            // destroyAll has been shared but missing http property
            if (opt.path === undefined) return;

            expect(opt.path, method.stringName).to.match(/^\/.*/);
          });
        });
      });
    });

    it('should catch error if nested function throws', function(done) {
      var test = this;
      this.get('/api/books/' + test.book.id + '/pages/' + this.page.id + '/throws')
        .end(function(err, res) {
          if (err) return done(err);

          expect(res.body).to.be.an('object');
          expect(res.body.error).to.be.an('object');
          expect(res.body.error.name).to.equal('Error');
          expect(res.body.error.statusCode).to.equal(500);
          expect(res.body.error.message).to.equal('This should not crash the app');

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

  describe('hasOne', function() {
    var cust;

    before(function createCustomer(done) {
      var test = this;
      app.models.customer.create({ name: 'John' }, function(err, c) {
        if (err) return done(err);

        cust = c;

        done();
      });
    });

    after(function(done) {
      var self = this;
      this.app.models.customer.destroyAll(function(err) {
        if (err) return done(err);

        self.app.models.profile.destroyAll(done);
      });
    });

    it('should create the referenced model', function(done) {
      var url = '/api/customers/' + cust.id + '/profile';

      this.post(url)
        .send({ points: 10 })
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body.points).to.be.eql(10);
          expect(res.body.customerId).to.be.eql(cust.id);

          done();
        });
    });

    it('should find the referenced model', function(done) {
      var url = '/api/customers/' + cust.id + '/profile';
      this.get(url)
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body.points).to.be.eql(10);
          expect(res.body.customerId).to.be.eql(cust.id);

          done();
        });
    });

    it('should not create the referenced model twice', function(done) {
      var url = '/api/customers/' + cust.id + '/profile';
      this.post(url)
        .send({ points: 20 })
        .expect(500, function(err, res) {
          done(err);
        });
    });

    it('should update the referenced model', function(done) {
      var url = '/api/customers/' + cust.id + '/profile';
      this.put(url)
        .send({ points: 100 })
        .expect(200, function(err, res) {
          if (err) return done(err);

          expect(res.body.points).to.be.eql(100);
          expect(res.body.customerId).to.be.eql(cust.id);

          done();
        });
    });

    it('should delete the referenced model', function(done) {
      var url = '/api/customers/' + cust.id + '/profile';
      this.del(url)
        .expect(204, function(err, res) {
          done(err);
        });
    });

    it('should not find the referenced model', function(done) {
      var url = '/api/customers/' + cust.id + '/profile';
      this.get(url)
        .expect(404, function(err, res) {
          done(err);
        });
    });
  });
});