// 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

'use strict';

// This test written in mocha+should.js
/* global getSchema:false */
var should = require('./init.js');

var j = require('../'),
  Schema = j.Schema,
  AbstractClass = j.AbstractClass,
  Hookable = j.Hookable,

  db, User;

describe('hooks', function() {
  before(function(done) {
    db = getSchema();

    User = db.define('User', {
      email: {type: String, index: true},
      name: String,
      password: String,
      state: String,
    });

    db.automigrate('User', done);
  });

  describe('initialize', function() {
    afterEach(function() {
      User.afterInitialize = null;
    });

    it('should be triggered on new', function(done) {
      User.afterInitialize = function() {
        done();
      };
      new User;
    });

    it('should be triggered on create', function(done) {
      var user;
      User.afterInitialize = function() {
        if (this.name === 'Nickolay') {
          this.name += ' Rozental';
        }
      };
      User.create({name: 'Nickolay'}, function(err, u) {
        u.id.should.be.ok;
        u.name.should.equal('Nickolay Rozental');
        done();
      });
    });
  });

  describe('create', function() {
    afterEach(removeHooks('Create'));

    it('should be triggered on create', function(done) {
      addHooks('Create', done);
      User.create();
    });

    it('should not be triggered on new', function() {
      User.beforeCreate = function(next) {
        should.fail('This should not be called');
        next();
      };
      var u = new User;
    });

    it('should be triggered on new+save', function(done) {
      addHooks('Create', done);
      (new User).save();
    });

    it('afterCreate should not be triggered on failed create', function(done) {
      var old = User.dataSource.connector.create;
      User.dataSource.connector.create = function(modelName, id, cb) {
        cb(new Error('error'));
      };

      User.afterCreate = function() {
        throw new Error('shouldn\'t be called');
      };
      User.create(function(err, user) {
        User.dataSource.connector.create = old;
        done();
      });
    });

    it('afterCreate should not be triggered on failed beforeCreate', function(done) {
      User.beforeCreate = function(next, data) {
        // Skip next()
        next(new Error('fail in beforeCreate'));
      };

      var old = User.dataSource.connector.create;
      User.dataSource.connector.create = function(modelName, id, cb) {
        throw new Error('shouldn\'t be called');
      };

      User.afterCreate = function() {
        throw new Error('shouldn\'t be called');
      };
      User.create(function(err, user) {
        User.dataSource.connector.create = old;
        done();
      });
    });
  });

  describe('save', function() {
    afterEach(removeHooks('Save'));

    it('should be triggered on create', function(done) {
      addHooks('Save', done);
      User.create();
    });

    it('should be triggered on new+save', function(done) {
      addHooks('Save', done);
      (new User).save();
    });

    it('should be triggered on updateAttributes', function(done) {
      User.create(function(err, user) {
        addHooks('Save', done);
        user.updateAttributes({name: 'Anatoliy'});
      });
    });

    it('should be triggered on save', function(done) {
      User.create(function(err, user) {
        addHooks('Save', done);
        user.name = 'Hamburger';
        user.save();
      });
    });

    it('should save full object', function(done) {
      User.create(function(err, user) {
        User.beforeSave = function(next, data) {
          data.should.have.keys('id', 'name', 'email',
            'password', 'state');
          done();
        };
        user.save();
      });
    });

    it('should save actual modifications to database', function(done) {
      User.beforeSave = function(next, data) {
        data.password = 'hash';
        next();
      };
      User.destroyAll(function() {
        User.create({
          email: 'james.bond@example.com',
          password: '53cr3t',
        }, function() {
          User.findOne({
            where: {email: 'james.bond@example.com'},
          }, function(err, jb) {
            jb.password.should.equal('hash');
            done();
          });
        });
      });
    });

    it('should save actual modifications on updateAttributes', function(done) {
      User.beforeSave = function(next, data) {
        data.password = 'hash';
        next();
      };
      User.destroyAll(function() {
        User.create({
          email: 'james.bond@example.com',
        }, function(err, u) {
          u.updateAttribute('password', 'new password', function(e, u) {
            should.not.exist(e);
            should.exist(u);
            u.password.should.equal('hash');
            User.findOne({
              where: {email: 'james.bond@example.com'},
            }, function(err, jb) {
              jb.password.should.equal('hash');
              done();
            });
          });
        });
      });
    });

    it('beforeSave should be able to skip next', function(done) {
      User.create(function(err, user) {
        User.beforeSave = function(next, data) {
          next(null, 'XYZ');
        };
        user.save(function(err, result) {
          result.should.be.eql('XYZ');
          done();
        });
      });
    });
  });

  describe('update', function() {
    afterEach(removeHooks('Update'));

    it('should not be triggered on create', function() {
      User.beforeUpdate = function(next) {
        should.fail('This should not be called');
        next();
      };
      User.create();
    });

    it('should not be triggered on new+save', function() {
      User.beforeUpdate = function(next) {
        should.fail('This should not be called');
        next();
      };
      (new User).save();
    });

    it('should be triggered on updateAttributes', function(done) {
      User.create(function(err, user) {
        addHooks('Update', done);
        user.updateAttributes({name: 'Anatoliy'});
      });
    });

    it('should be triggered on save', function(done) {
      User.create(function(err, user) {
        addHooks('Update', done);
        user.name = 'Hamburger';
        user.save();
      });
    });

    it('should update limited set of fields', function(done) {
      User.create(function(err, user) {
        User.beforeUpdate = function(next, data) {
          data.should.have.keys('name', 'email');
          done();
        };
        user.updateAttributes({name: 1, email: 2});
      });
    });

    it('should not trigger after-hook on failed save', function(done) {
      User.afterUpdate = function() {
        should.fail('afterUpdate shouldn\'t be called');
      };
      User.create(function(err, user) {
        var save = User.dataSource.connector.save;
        User.dataSource.connector.save = function(modelName, id, cb) {
          User.dataSource.connector.save = save;
          cb(new Error('Error'));
        };

        user.save(function(err) {
          done();
        });
      });
    });
  });

  describe('destroy', function() {
    afterEach(removeHooks('Destroy'));

    it('should be triggered on destroy', function(done) {
      var hook = 'not called';
      User.beforeDestroy = function(next) {
        hook = 'called';
        next();
      };
      User.afterDestroy = function(next) {
        hook.should.eql('called');
        next();
      };
      User.create(function(err, user) {
        user.destroy(done);
      });
    });

    it('should not trigger after-hook on failed destroy', function(done) {
      var destroy = User.dataSource.connector.destroy;
      User.dataSource.connector.destroy = function(modelName, id, cb) {
        cb(new Error('error'));
      };
      User.afterDestroy = function() {
        should.fail('afterDestroy shouldn\'t be called');
      };
      User.create(function(err, user) {
        user.destroy(function(err) {
          User.dataSource.connector.destroy = destroy;
          done();
        });
      });
    });
  });

  describe('lifecycle', function() {
    var life = [], user;
    before(function(done) {
      User.beforeSave = function(d) {
        life.push('beforeSave');
        d();
      };
      User.beforeCreate = function(d) {
        life.push('beforeCreate');
        d();
      };
      User.beforeUpdate = function(d) {
        life.push('beforeUpdate');
        d();
      };
      User.beforeDestroy = function(d) {
        life.push('beforeDestroy');
        d();
      };
      User.beforeValidate = function(d) {
        life.push('beforeValidate');
        d();
      };
      User.afterInitialize = function() {
        life.push('afterInitialize');
      };
      User.afterSave = function(d) {
        life.push('afterSave');
        d();
      };
      User.afterCreate = function(d) {
        life.push('afterCreate');
        d();
      };
      User.afterUpdate = function(d) {
        life.push('afterUpdate');
        d();
      };
      User.afterDestroy = function(d) {
        life.push('afterDestroy');
        d();
      };
      User.afterValidate = function(d) {
        life.push('afterValidate');
        d();
      };
      User.create(function(e, u) {
        user = u;
        life = [];
        done();
      });
    });
    beforeEach(function() {
      life = [];
    });

    it('should describe create sequence', function(done) {
      User.create(function() {
        life.should.eql([
          'afterInitialize',
          'beforeValidate',
          'afterValidate',
          'beforeCreate',
          'beforeSave',
          'afterSave',
          'afterCreate',
        ]);
        done();
      });
    });

    it('should describe new+save sequence', function(done) {
      var u = new User;
      u.save(function() {
        life.should.eql([
          'afterInitialize',
          'beforeValidate',
          'afterValidate',
          'beforeCreate',
          'beforeSave',
          'afterSave',
          'afterCreate',
        ]);
        done();
      });
    });

    it('should describe updateAttributes sequence', function(done) {
      user.updateAttributes({name: 'Antony'}, function() {
        life.should.eql([
          'beforeValidate',
          'afterValidate',
          'beforeSave',
          'beforeUpdate',
          'afterUpdate',
          'afterSave',
        ]);
        done();
      });
    });

    it('should describe isValid sequence', function(done) {
      should.not.exist(
        user.constructor._validations,
        'Expected user to have no validations, but she have'
      );
      user.isValid(function(valid) {
        valid.should.be.true;
        life.should.eql([
          'beforeValidate',
          'afterValidate',
        ]);
        done();
      });
    });

    it('should describe destroy sequence', function(done) {
      user.destroy(function() {
        life.should.eql([
          'beforeDestroy',
          'afterDestroy',
        ]);
        done();
      });
    });
  });
});

function addHooks(name, done) {
  var called = false, random = String(Math.floor(Math.random() * 1000));
  User['before' + name] = function(next, data) {
    called = true;
    data.email = random;
    next();
  };
  User['after' + name] = function(next) {
    (new Boolean(called)).should.equal(true);
    this.should.have.property('email', random);
    done();
  };
}

function removeHooks(name) {
  return function() {
    User['after' + name] = null;
    User['before' + name] = null;
  };
}