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

// This test written in mocha+should.js
var should = require('./init.js');
var async = require('async');
var db, User;

describe('basic-querying', function() {

  before(function(done) {
    db = getSchema();
    User = db.define('User', {
      seq: { type: Number, index: true },
      name: { type: String, index: true, sort: true },
      email: { type: String, index: true },
      birthday: { type: Date, index: true },
      role: { type: String, index: true },
      order: { type: Number, index: true, sort: true },
      vip: { type: Boolean },
    });

    db.automigrate(done);

  });

  describe('ping', function() {
    it('should be able to test connections', function(done) {
      db.ping(function(err) {
        should.not.exist(err);
        done();
      });
    });
  });

  describe('findById', function() {

    before(function(done) {
      User.destroyAll(done);
    });

    it('should query by id: not found', function(done) {
      User.findById(1, function(err, u) {
        should.not.exist(u);
        should.not.exist(err);
        done();
      });
    });

    it('should query by id: found', function(done) {
      User.create(function(err, u) {
        should.not.exist(err);
        should.exist(u.id);
        User.findById(u.id, function(err, u) {
          should.exist(u);
          should.not.exist(err);
          u.should.be.an.instanceOf(User);
          done();
        });
      });
    });

  });

  describe('findByIds', function() {
    var createdUsers;
    before(function(done) {
      var people = [
        { name: 'a', vip: true },
        { name: 'b' },
        { name: 'c' },
        { name: 'd', vip: true },
        { name: 'e' },
        { name: 'f' },
      ];
      db.automigrate(['User'], function(err) {
        User.create(people, function(err, users) {
          should.not.exist(err);
          // Users might be created in parallel and the generated ids can be
          // out of sequence
          createdUsers = users;
          done();
        });
      });
    });

    it('should query by ids', function(done) {
      User.findByIds(
        [createdUsers[2].id, createdUsers[1].id, createdUsers[0].id],
        function(err, users) {
          should.exist(users);
          should.not.exist(err);
          var names = users.map(function(u) {
            return u.name;
          });
          names.should.eql(
            [createdUsers[2].name, createdUsers[1].name, createdUsers[0].name]);
          done();
        });
    });

    it('should query by ids and condition', function(done) {
      User.findByIds([
        createdUsers[0].id,
        createdUsers[1].id,
        createdUsers[2].id,
        createdUsers[3].id],
        { where: { vip: true }}, function(err, users) {
          should.exist(users);
          should.not.exist(err);
          var names = users.map(function(u) {
            return u.name;
          });
          names.should.eql(createdUsers.slice(0, 4).
            filter(function(u) {
              return u.vip;
            }).map(function(u) {
              return u.name;
            }));
          done();
        });
    });

  });

  describe('find', function() {

    before(seed);

    before(function setupDelayingLoadedHook() {
      User.observe('loaded', nextAfterDelay);
    });

    after(function removeDelayingLoadHook() {
      User.removeObserver('loaded', nextAfterDelay);
    });

    it('should query collection', function(done) {
      User.find(function(err, users) {
        should.exists(users);
        should.not.exists(err);
        users.should.have.lengthOf(6);
        done();
      });
    });

    it('should query limited collection', function(done) {
      User.find({ limit: 3 }, function(err, users) {
        should.exists(users);
        should.not.exists(err);
        users.should.have.lengthOf(3);
        done();
      });
    });

    it('should query collection with skip & limit', function(done) {
      User.find({ skip: 1, limit: 4, order: 'seq' }, function(err, users) {
        should.exists(users);
        should.not.exists(err);
        users[0].seq.should.be.eql(1);
        users.should.have.lengthOf(4);
        done();
      });
    });

    it('should query collection with offset & limit', function(done) {
      User.find({ offset: 2, limit: 3, order: 'seq' }, function(err, users) {
        should.exists(users);
        should.not.exists(err);
        users[0].seq.should.be.eql(2);
        users.should.have.lengthOf(3);
        done();
      });
    });

    it('should query filtered collection', function(done) {
      User.find({ where: { role: 'lead' }}, function(err, users) {
        should.exists(users);
        should.not.exists(err);
        users.should.have.lengthOf(2);
        done();
      });
    });

    it('should query collection sorted by numeric field', function(done) {
      User.find({ order: 'order' }, function(err, users) {
        should.exists(users);
        should.not.exists(err);
        users.forEach(function(u, i) {
          u.order.should.eql(i + 1);
        });
        done();
      });
    });

    it('should query collection desc sorted by numeric field', function(done) {
      User.find({ order: 'order DESC' }, function(err, users) {
        should.exists(users);
        should.not.exists(err);
        users.forEach(function(u, i) {
          u.order.should.eql(users.length - i);
        });
        done();
      });
    });

    it('should query collection sorted by string field', function(done) {
      User.find({ order: 'name' }, function(err, users) {
        should.exists(users);
        should.not.exists(err);
        users.shift().name.should.equal('George Harrison');
        users.shift().name.should.equal('John Lennon');
        users.pop().name.should.equal('Stuart Sutcliffe');
        done();
      });
    });

    it('should query collection desc sorted by string field', function(done) {
      User.find({ order: 'name DESC' }, function(err, users) {
        should.exists(users);
        should.not.exists(err);
        users.pop().name.should.equal('George Harrison');
        users.pop().name.should.equal('John Lennon');
        users.shift().name.should.equal('Stuart Sutcliffe');
        done();
      });
    });

    it('should query sorted desc by order integer field even though there' +
        'is an async model loaded hook', function(done) {
      User.find({ order: 'order DESC' }, function(err, users) {
        if (err) return done(err);

        should.exists(users);
        var order = users.map(function(u) { return u.order; });
        order.should.eql([6, 5, 4, 3, 2, 1]);
        done();
      });
    });

    it('should support "and" operator that is satisfied', function(done) {
      User.find({ where: { and: [
        { name: 'John Lennon' },
        { role: 'lead' },
      ] }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 1);
        done();
      });
    });

    it('should support "and" operator that is not satisfied', function(done) {
      User.find({ where: { and: [
        { name: 'John Lennon' },
        { role: 'member' },
      ] }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 0);
        done();
      });
    });

    it('should support "or" that is satisfied', function(done) {
      User.find({ where: { or: [
        { name: 'John Lennon' },
        { role: 'lead' },
      ] }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 2);
        done();
      });
    });

    it('should support "or" operator that is not satisfied', function(done) {
      User.find({ where: { or: [
        { name: 'XYZ' },
        { role: 'Hello1' },
      ] }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 0);
        done();
      });
    });

    it('should support date "gte" that is satisfied', function(done) {
      User.find({ order: 'seq', where: { birthday: { 'gte': new Date('1980-12-08') },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 1);
        users[0].name.should.equal('John Lennon');
        done();
      });
    });

    it('should support date "gt" that is not satisfied', function(done) {
      User.find({ order: 'seq', where: { birthday: { 'gt': new Date('1980-12-08') },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 0);
        done();
      });
    });

    it('should support date "gt" that is satisfied', function(done) {
      User.find({ order: 'seq', where: { birthday: { 'gt': new Date('1980-12-07') },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 1);
        users[0].name.should.equal('John Lennon');
        done();
      });
    });

    it('should support date "lt" that is satisfied', function(done) {
      User.find({ order: 'seq', where: { birthday: { 'lt': new Date('1980-12-07') },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 1);
        users[0].name.should.equal('Paul McCartney');
        done();
      });
    });

    it('should support number "gte" that is satisfied', function(done) {
      User.find({ order: 'seq', where: { order: { 'gte': 3 },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 4);
        users[0].name.should.equal('George Harrison');
        done();
      });
    });

    it('should support number "gt" that is not satisfied', function(done) {
      User.find({ order: 'seq', where: { order: { 'gt': 6 },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 0);
        done();
      });
    });

    it('should support number "gt" that is satisfied', function(done) {
      User.find({ order: 'seq', where: { order: { 'gt': 5 },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 1);
        users[0].name.should.equal('Ringo Starr');
        done();
      });
    });

    it('should support number "lt" that is satisfied', function(done) {
      User.find({ order: 'seq', where: { order: { 'lt': 2 },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 1);
        users[0].name.should.equal('Paul McCartney');
        done();
      });
    });

    it('should support number "gt" that is satisfied by null value', function(done) {
      User.find({ order: 'seq', where: { order: { 'gt': null },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 0);
        done();
      });
    });

    it('should support number "lt" that is not satisfied by null value', function(done) {
      User.find({ order: 'seq', where: { order: { 'lt': null },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 0);
        done();
      });
    });

    it('should support string "gte" that is satisfied by null value', function(done) {
      User.find({ order: 'seq', where: { name: { 'gte': null },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 0);
        done();
      });
    });

    it('should support string "gte" that is satisfied', function(done) {
      User.find({ order: 'seq', where: { name: { 'gte': 'Paul McCartney' },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 4);
        users[0].name.should.equal('Paul McCartney');
        done();
      });
    });

    it('should support string "gt" that is not satisfied', function(done) {
      User.find({ order: 'seq', where: { name: { 'gt': 'xyz' },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 0);
        done();
      });
    });

    it('should support string "gt" that is satisfied', function(done) {
      User.find({ order: 'seq', where: { name: { 'gt': 'Paul McCartney' },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 3);
        users[0].name.should.equal('Ringo Starr');
        done();
      });
    });

    it('should support string "lt" that is satisfied', function(done) {
      User.find({ order: 'seq', where: { name: { 'lt': 'Paul McCartney' },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 2);
        users[0].name.should.equal('John Lennon');
        done();
      });
    });

    it('should support boolean "gte" that is satisfied', function(done) {
      User.find({ order: 'seq', where: { vip: { 'gte': true },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 3);
        users[0].name.should.equal('John Lennon');
        done();
      });
    });

    it('should support boolean "gt" that is not satisfied', function(done) {
      User.find({ order: 'seq', where: { vip: { 'gt': true },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 0);
        done();
      });
    });

    it('should support boolean "gt" that is satisfied', function(done) {
      User.find({ order: 'seq', where: { vip: { 'gt': false },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 3);
        users[0].name.should.equal('John Lennon');
        done();
      });
    });

    it('should support boolean "lt" that is satisfied', function(done) {
      User.find({ order: 'seq', where: { vip: { 'lt': true },
      }}, function(err, users) {
        should.not.exist(err);
        users.should.have.property('length', 2);
        users[0].name.should.equal('George Harrison');
        done();
      });
    });

    it('should only include fields as specified', function(done) {
      var remaining = 0;

      function sample(fields) {

        return {
          expect: function(arr) {
            remaining++;
            User.find({ fields: fields }, function(err, users) {

              remaining--;
              if (err) return done(err);

              should.exists(users);

              if (remaining === 0) {
                done();
              }

              users.forEach(function(user) {
                var obj = user.toObject();

                Object.keys(obj)
                  .forEach(function(key) {
                    // if the obj has an unexpected value
                    if (obj[key] !== undefined && arr.indexOf(key) === -1) {
                      console.log('Given fields:', fields);
                      console.log('Got:', key, obj[key]);
                      console.log('Expected:', arr);
                      throw new Error('should not include data for key: ' + key);
                    }
                  });
              });
            });
          },
        };
      }

      sample({ name: true }).expect(['name']);
      sample({ name: false }).expect(['id', 'seq', 'email', 'role', 'order', 'birthday', 'vip']);
      sample({ name: false, id: true }).expect(['id']);
      sample({ id: true }).expect(['id']);
      sample('id').expect(['id']);
      sample(['id']).expect(['id']);
      sample(['email']).expect(['email']);
    });

  });

  describe('count', function() {

    before(seed);

    it('should query total count', function(done) {
      User.count(function(err, n) {
        should.not.exist(err);
        should.exist(n);
        n.should.equal(6);
        done();
      });
    });

    it('should query filtered count', function(done) {
      User.count({ role: 'lead' }, function(err, n) {
        should.not.exist(err);
        should.exist(n);
        n.should.equal(2);
        done();
      });
    });
  });

  describe('findOne', function() {

    before(seed);

    it('should find first record (default sort by id)', function(done) {
      User.all({ order: 'id' }, function(err, users) {
        User.findOne(function(e, u) {
          should.not.exist(e);
          should.exist(u);
          u.id.toString().should.equal(users[0].id.toString());
          done();
        });
      });
    });

    it('should find first record', function(done) {
      User.findOne({ order: 'order' }, function(e, u) {
        should.not.exist(e);
        should.exist(u);
        u.order.should.equal(1);
        u.name.should.equal('Paul McCartney');
        done();
      });
    });

    it('should find last record', function(done) {
      User.findOne({ order: 'order DESC' }, function(e, u) {
        should.not.exist(e);
        should.exist(u);
        u.order.should.equal(6);
        u.name.should.equal('Ringo Starr');
        done();
      });
    });

    it('should find last record in filtered set', function(done) {
      User.findOne({
        where: { role: 'lead' },
        order: 'order DESC',
      }, function(e, u) {
        should.not.exist(e);
        should.exist(u);
        u.order.should.equal(2);
        u.name.should.equal('John Lennon');
        done();
      });
    });

    it('should work even when find by id', function(done) {
      User.findOne(function(e, u) {
        User.findOne({ where: { id: u.id }}, function(err, user) {
          should.not.exist(err);
          should.exist(user);
          done();
        });
      });
    });

  });

  describe('exists', function() {

    before(seed);

    it('should check whether record exist', function(done) {
      User.findOne(function(e, u) {
        User.exists(u.id, function(err, exists) {
          should.not.exist(err);
          should.exist(exists);
          exists.should.be.ok;
          done();
        });
      });
    });

    it('should check whether record not exist', function(done) {
      User.destroyAll(function() {
        User.exists(42, function(err, exists) {
          should.not.exist(err);
          exists.should.not.be.ok;
          done();
        });
      });
    });
  });

  context('regexp operator', function() {
    var invalidDataTypes = [0, true, {}, [], Function, null];

    before(seed);

    it('should return an error for invalid data types', function(done) {
      // `undefined` is not tested because the `removeUndefined` function
      // in `lib/dao.js` removes it before coercion
      invalidDataTypes.forEach(function(invalidDataType) {
        User.find({ where: { name: { regexp: invalidDataType }}}, function(err,
            users) {
          should.exist(err);
        });
      });
      done();
    });
  });
});

describe.skip('queries', function() {
  var Todo;

  before(function prepDb(done) {
    var db = getSchema();
    Todo = db.define('Todo', {
      id: false,
      content: { type: 'string' },
    }, {
      idInjection: false,
    });
    db.automigrate(['Todo'], done);
  });
  beforeEach(function resetFixtures(done) {
    Todo.destroyAll(function() {
      Todo.create([
        { content: 'Buy eggs' },
        { content: 'Buy milk' },
        { content: 'Buy sausages' },
      ], done);
    });
  });

  context('that do not require an id', function() {
    it('should work for create', function(done) {
      Todo.create({ content: 'Buy ham' }, function(err) {
        should.not.exist(err);
        done();
      });
    });

    it('should work for updateOrCreate/upsert', function(done) {
      var aliases = ['updateOrCreate', 'upsert'];
      async.each(aliases, function(alias, cb) {
        Todo[alias]({ content: 'Buy ham' }, function(err) {
          should.not.exist(err);
          cb();
        });
      }, done);
    });

    it('should work for findOrCreate', function(done) {
      Todo.findOrCreate({ content: 'Buy ham' }, function(err) {
        should.not.exist(err);
        done();
      });
    });

    it('should work for exists', function(done) {
      Todo.exists({ content: 'Buy ham' }, function(err) {
        should.not.exist(err);
        done();
      });
    });

    it('should work for find', function(done) {
      Todo.find(function(err) {
        should.not.exist(err);
        done();
      });
    });

    it('should work for findOne', function(done) {
      Todo.findOne(function(err) {
        should.not.exist(err);
        done();
      });
    });

    it('should work for deleteAll/destroyAll/remove', function(done) {
      // FIXME: We should add a DAO.delete static method alias for consistency
      // (DAO.prototype.delete instance method already exists)
      var aliases = ['deleteAll', 'destroyAll', 'remove'];
      async.each(aliases, function(alias, cb) {
        Todo[alias](function(err) {
          should.not.exist(err);
          cb();
        });
      }, done);
    });

    it('should work for update/updateAll', function(done) {
      Todo.update({ content: 'Buy ham' }, function(err) {
        should.not.exist(err);
        done();
      });
    });

    it('should work for count', function(done) {
      Todo.count({ content: 'Buy eggs' }, function(err) {
        should.not.exist(err);
        done();
      });
    });
  });

  context('that require an id', function() {
    var expectedErrMsg = 'Primary key is missing for the Todo model';

    it('should return an error for findById', function(done) {
      Todo.findById(1, function(err) {
        should.exist(err);
        err.message.should.equal(expectedErrMsg);
        done();
      });
    });

    it('should return an error for findByIds', function(done) {
      Todo.findByIds([1, 2], function(err) {
        should.exist(err);
        err.message.should.equal(expectedErrMsg);
        done();
      });
    });

    it('should return an error for deleteById/destroyById/removeById',
    function(done) {
      var aliases = ['deleteById', 'destroyById', 'removeById'];
      async.each(aliases, function(alias, cb) {
        Todo[alias](1, function(err) {
          should.exist(err);
          err.message.should.equal(expectedErrMsg);
          cb();
        });
      }, done);
    });

    it('should return an error for instance.save', function(done) {
      var todo = new Todo();
      todo.content = 'Buy ham';
      todo.save(function(err) {
        should.exist(err);
        err.message.should.equal(expectedErrMsg);
        done();
      });
    });

    it('should return an error for instance.delete', function(done) {
      Todo.findOne(function(err, todo) {
        todo.delete(function(err) {
          should.exist(err);
          err.message.should.equal(expectedErrMsg);
          done();
        });
      });
    });

    it('should return an error for instance.updateAttribute', function(done) {
      Todo.findOne(function(err, todo) {
        todo.updateAttribute('content', 'Buy ham', function(err) {
          should.exist(err);
          err.message.should.equal(expectedErrMsg);
          done();
        });
      });
    });

    it('should return an error for instance.updateAttributes', function(done) {
      Todo.findOne(function(err, todo) {
        todo.updateAttributes({ content: 'Buy ham' }, function(err) {
          should.exist(err);
          err.message.should.equal(expectedErrMsg);
          done();
        });
      });
    });
  });
});

function seed(done) {
  var beatles = [
    {
      seq: 0,
      name: 'John Lennon',
      email: 'john@b3atl3s.co.uk',
      role: 'lead',
      birthday: new Date('1980-12-08'),
      order: 2,
      vip: true,
    },
    {
      seq: 1,
      name: 'Paul McCartney',
      email: 'paul@b3atl3s.co.uk',
      role: 'lead',
      birthday: new Date('1942-06-18'),
      order: 1,
      vip: true,
    },
    { seq: 2, name: 'George Harrison', order: 5, vip: false },
    { seq: 3, name: 'Ringo Starr', order: 6, vip: false },
    { seq: 4, name: 'Pete Best', order: 4 },
    { seq: 5, name: 'Stuart Sutcliffe', order: 3, vip: true },
  ];

  async.series([
    User.destroyAll.bind(User),
    function(cb) {
      async.each(beatles, User.create.bind(User), cb);
    },
  ], done);
}

function nextAfterDelay(ctx, next) {
  var randomTimeoutTrigger = Math.floor(Math.random() * 100);
  setTimeout(function() { process.nextTick(next); }, randomTimeoutTrigger);
}