// 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';
  
  var should = require('./init.js');
  var utils = require('../lib/utils');
  var fieldsToArray = utils.fieldsToArray;
  var removeUndefined = utils.removeUndefined;
  var mergeSettings = utils.mergeSettings;
  var mergeIncludes = utils.mergeIncludes;
  var sortObjectsByIds = utils.sortObjectsByIds;
  var uniq = utils.uniq;
  
  describe('util.fieldsToArray', function() {
    function sample(fields, excludeUnknown) {
      var properties = ['foo', 'bar', 'bat', 'baz'];
      return {
        expect: function(arr) {
          should.deepEqual(fieldsToArray(fields, properties, excludeUnknown), arr);
        },
      };
    }
  
    it('Turn objects and strings into an array of fields' +
      ' to include when finding models', function() {
      sample(false).expect(undefined);
      sample(null).expect(undefined);
      sample({}).expect(undefined);
      sample('foo').expect(['foo']);
      sample(['foo']).expect(['foo']);
      sample({'foo': 1}).expect(['foo']);
      sample({'bat': true}).expect(['bat']);
      sample({'bat': 0}).expect(['foo', 'bar', 'baz']);
      sample({'bat': false}).expect(['foo', 'bar', 'baz']);
    });
  
    it('should exclude unknown properties', function() {
      sample(false, true).expect(undefined);
      sample(null, true).expect(undefined);
      sample({}, true).expect(undefined);
      sample('foo', true).expect(['foo']);
      sample(['foo', 'unknown'], true).expect(['foo']);
      sample({'foo': 1, unknown: 1}, true).expect(['foo']);
      sample({'bat': true, unknown: true}, true).expect(['bat']);
      sample({'bat': 0}, true).expect(['foo', 'bar', 'baz']);
      sample({'bat': false}, true).expect(['foo', 'bar', 'baz']);
    });
  });
  
  describe('util.removeUndefined', function() {
    it('Remove undefined values from the query object', function() {
      var q1 = {where: {x: 1, y: undefined}};
      should.deepEqual(removeUndefined(q1), {where: {x: 1}});
  
      var q2 = {where: {x: 1, y: 2}};
      should.deepEqual(removeUndefined(q2), {where: {x: 1, y: 2}});
  
      var q3 = {where: {x: 1, y: {in: [2, undefined]}}};
      should.deepEqual(removeUndefined(q3), {where: {x: 1, y: {in: [2]}}});
  
      should.equal(removeUndefined(null), null);
  
      should.equal(removeUndefined(undefined), undefined);
  
      should.equal(removeUndefined('x'), 'x');
  
      var date = new Date();
      var q4 = {where: {x: 1, y: date}};
      should.deepEqual(removeUndefined(q4), {where: {x: 1, y: date}});
  
      // test handling of undefined
      var q5 = {where: {x: 1, y: undefined}};
      should.deepEqual(removeUndefined(q5, 'nullify'), {where: {x: 1, y: null}});
  
      var q6 = {where: {x: 1, y: undefined}};
      (function() { removeUndefined(q6, 'throw'); }).should.throw(/`undefined` in query/);
    });
  });
  
  describe('util.parseSettings', function() {
    it('Parse a full url into a settings object', function() {
      var url = 'mongodb://x:y@localhost:27017/mydb?w=2';
      var settings = utils.parseSettings(url);
      should.equal(settings.hostname, 'localhost');
      should.equal(settings.port, 27017);
      should.equal(settings.host, 'localhost');
      should.equal(settings.user, 'x');
      should.equal(settings.password, 'y');
      should.equal(settings.database, 'mydb');
      should.equal(settings.connector, 'mongodb');
      should.equal(settings.w, '2');
      should.equal(settings.url, 'mongodb://x:y@localhost:27017/mydb?w=2');
    });
  
    it('Parse a url without auth into a settings object', function() {
      var url = 'mongodb://localhost:27017/mydb/abc?w=2';
      var settings = utils.parseSettings(url);
      should.equal(settings.hostname, 'localhost');
      should.equal(settings.port, 27017);
      should.equal(settings.host, 'localhost');
      should.equal(settings.user, undefined);
      should.equal(settings.password, undefined);
      should.equal(settings.database, 'mydb');
      should.equal(settings.connector, 'mongodb');
      should.equal(settings.w, '2');
      should.equal(settings.url, 'mongodb://localhost:27017/mydb/abc?w=2');
    });
  
    it('Parse a url with complex query into a settings object', function() {
      var url = 'mysql://127.0.0.1:3306/mydb?x[a]=1&x[b]=2&engine=InnoDB';
      var settings = utils.parseSettings(url);
      should.equal(settings.hostname, '127.0.0.1');
      should.equal(settings.port, 3306);
      should.equal(settings.host, '127.0.0.1');
      should.equal(settings.user, undefined);
      should.equal(settings.password, undefined);
      should.equal(settings.database, 'mydb');
      should.equal(settings.connector, 'mysql');
      should.equal(settings.x.a, '1');
      should.equal(settings.x.b, '2');
      should.equal(settings.engine, 'InnoDB');
      should.equal(settings.url, 'mysql://127.0.0.1:3306/mydb?x[a]=1&x[b]=2&engine=InnoDB');
    });
  
    it('Parse a url without auth into a settings object', function() {
      var url = 'memory://?x=1';
      var settings = utils.parseSettings(url);
      should.equal(settings.hostname, '');
      should.equal(settings.user, undefined);
      should.equal(settings.password, undefined);
      should.equal(settings.database, undefined);
      should.equal(settings.connector, 'memory');
      should.equal(settings.x, '1');
      should.equal(settings.url, 'memory://?x=1');
    });
  });
  
  describe('mergeSettings', function() {
    it('should merge settings correctly', function() {
      var src = {base: 'User',
        relations: {accessTokens: {model: 'accessToken', type: 'hasMany',
          foreignKey: 'userId'},
          account: {model: 'account', type: 'belongsTo'}},
        acls: [
          {accessType: '*',
            permission: 'DENY',
            principalType: 'ROLE',
            principalId: '$everyone'},
          {accessType: '*',
            permission: 'ALLOW',
            principalType: 'ROLE',
            property: 'login',
            principalId: '$everyone'},
          {permission: 'ALLOW',
            property: 'findById',
            principalType: 'ROLE',
            principalId: '$owner'},
        ]};
      var tgt = {strict: false,
        acls: [
          {principalType: 'ROLE',
            principalId: '$everyone',
            permission: 'ALLOW',
            property: 'create'},
          {principalType: 'ROLE',
            principalId: '$owner',
            permission: 'ALLOW',
            property: 'removeById'},
        ],
        maxTTL: 31556926,
        ttl: 1209600};
  
      var dst = mergeSettings(tgt, src);
  
      var expected = {strict: false,
        acls: [
          {principalType: 'ROLE',
            principalId: '$everyone',
            permission: 'ALLOW',
            property: 'create'},
          {principalType: 'ROLE',
            principalId: '$owner',
            permission: 'ALLOW',
            property: 'removeById'},
          {accessType: '*',
            permission: 'DENY',
            principalType: 'ROLE',
            principalId: '$everyone'},
          {accessType: '*',
            permission: 'ALLOW',
            principalType: 'ROLE',
            property: 'login',
            principalId: '$everyone'},
          {permission: 'ALLOW',
            property: 'findById',
            principalType: 'ROLE',
            principalId: '$owner'},
        ],
        maxTTL: 31556926,
        ttl: 1209600,
        base: 'User',
        relations: {accessTokens: {model: 'accessToken', type: 'hasMany',
          foreignKey: 'userId'},
          account: {model: 'account', type: 'belongsTo'}}};
  
      should.deepEqual(dst.acls, expected.acls, 'Merged settings should match the expectation');
    });
  });
  
  describe('sortObjectsByIds', function() {
    var items = [
      {id: 1, name: 'a'},
      {id: 2, name: 'b'},
      {id: 3, name: 'c'},
      {id: 4, name: 'd'},
      {id: 5, name: 'e'},
      {id: 6, name: 'f'},
    ];
  
    it('should sort', function() {
      var sorted = sortObjectsByIds('id', [6, 5, 4, 3, 2, 1], items);
      var names = sorted.map(function(u) { return u.name; });
      should.deepEqual(names, ['f', 'e', 'd', 'c', 'b', 'a']);
    });
  
    it('should sort - partial ids', function() {
      var sorted = sortObjectsByIds('id', [5, 3, 2], items);
      var names = sorted.map(function(u) { return u.name; });
      should.deepEqual(names, ['e', 'c', 'b', 'a', 'd', 'f']);
    });
  
    it('should sort - strict', function() {
      var sorted = sortObjectsByIds('id', [5, 3, 2], items, true);
      var names = sorted.map(function(u) { return u.name; });
      should.deepEqual(names, ['e', 'c', 'b']);
    });
  });
  
  describe('util.mergeIncludes', function() {
    function checkInputOutput(baseInclude, updateInclude, expectedInclude) {
      var mergedInclude = mergeIncludes(baseInclude, updateInclude);
      should.deepEqual(mergedInclude, expectedInclude,
        'Merged include should match the expectation');
    }
  
    it('Merge string values to object', function() {
      var baseInclude = 'relation1';
      var updateInclude = 'relation2';
      var expectedInclude = [
        {relation2: true},
        {relation1: true},
      ];
      checkInputOutput(baseInclude, updateInclude, expectedInclude);
    });
  
    it('Merge string & array values to object', function() {
      var baseInclude = 'relation1';
      var updateInclude = ['relation2'];
      var expectedInclude = [
        {relation2: true},
        {relation1: true},
      ];
      checkInputOutput(baseInclude, updateInclude, expectedInclude);
    });
  
    it('Merge string & object values to object', function() {
      var baseInclude = ['relation1'];
      var updateInclude = {relation2: 'relation2Include'};
      var expectedInclude = [
        {relation2: 'relation2Include'},
        {relation1: true},
      ];
      checkInputOutput(baseInclude, updateInclude, expectedInclude);
    });
  
    it('Merge array & array values to object', function() {
      var baseInclude = ['relation1'];
      var updateInclude = ['relation2'];
      var expectedInclude = [
        {relation2: true},
        {relation1: true},
      ];
      checkInputOutput(baseInclude, updateInclude, expectedInclude);
    });
  
    it('Merge array & object values to object', function() {
      var baseInclude = ['relation1'];
      var updateInclude = {relation2: 'relation2Include'};
      var expectedInclude = [
        {relation2: 'relation2Include'},
        {relation1: true},
      ];
      checkInputOutput(baseInclude, updateInclude, expectedInclude);
    });
  
    it('Merge object & object values to object', function() {
      var baseInclude = {relation1: 'relation1Include'};
      var updateInclude = {relation2: 'relation2Include'};
      var expectedInclude = [
        {relation2: 'relation2Include'},
        {relation1: 'relation1Include'},
      ];
      checkInputOutput(baseInclude, updateInclude, expectedInclude);
    });
  
    it('Override property collision with update value', function() {
      var baseInclude = {relation1: 'baseValue'};
      var updateInclude = {relation1: 'updateValue'};
      var expectedInclude = [
        {relation1: 'updateValue'},
      ];
      checkInputOutput(baseInclude, updateInclude, expectedInclude);
    });
  
    it('Merge string includes & include with relation syntax properly',
      function() {
        var baseInclude = 'relation1';
        var updateInclude = {relation: 'relation1'};
        var expectedInclude = [
          {relation: 'relation1'},
        ];
        checkInputOutput(baseInclude, updateInclude, expectedInclude);
      });
  
    it('Merge string includes & include with scope properly', function() {
      var baseInclude = 'relation1';
      var updateInclude = {
        relation: 'relation1',
        scope: {include: 'relation2'},
      };
      var expectedInclude = [
        {relation: 'relation1', scope: {include: 'relation2'}},
      ];
      checkInputOutput(baseInclude, updateInclude, expectedInclude);
    });
  
    it('Merge includes with and without relation syntax properly',
      function() {
        //w & w/o relation syntax - no collision
        var baseInclude = ['relation2'];
        var updateInclude = {
          relation: 'relation1',
          scope: {include: 'relation2'},
        };
        var expectedInclude = [{
          relation: 'relation1',
          scope: {include: 'relation2'},
        }, {relation2: true}];
        checkInputOutput(baseInclude, updateInclude, expectedInclude);
  
        //w & w/o relation syntax - collision
        baseInclude = ['relation1'];
        updateInclude = {relation: 'relation1', scope: {include: 'relation2'}};
        expectedInclude =
          [{relation: 'relation1', scope: {include: 'relation2'}}];
        checkInputOutput(baseInclude, updateInclude, expectedInclude);
  
        //w & w/o relation syntax - collision
        baseInclude = {relation: 'relation1', scope: {include: 'relation2'}};
        updateInclude = ['relation1'];
        expectedInclude = [{relation1: true}];
        checkInputOutput(baseInclude, updateInclude, expectedInclude);
      });
  
    it('Merge includes with mixture of strings, arrays & objects properly', function() {
      var baseInclude = ['relation1', {relation2: true},
        {relation: 'relation3', scope: {where: {id: 'some id'}}},
        {relation: 'relation5', scope: {where: {id: 'some id'}}},
      ];
      var updateInclude = ['relation4', {relation3: true},
        {relation: 'relation2', scope: {where: {id: 'some id'}}}];
      var expectedInclude = [{relation4: true}, {relation3: true},
        {relation: 'relation2', scope: {where: {id: 'some id'}}},
        {relation1: true},
        {relation: 'relation5', scope: {where: {id: 'some id'}}}];
      checkInputOutput(baseInclude, updateInclude, expectedInclude);
    });
  });
  
  describe('util.uniq', function() {
    it('should dedupe an array with duplicate number entries', function() {
      var a = [1, 2, 1, 3];
      var b = uniq(a);
      b.should.eql([1, 2, 3]);
    });
  
    it('should dedupe an array with duplicate string entries', function() {
      var a = ['a', 'a', 'b', 'a'];
      var b = uniq(a);
      b.should.eql(['a', 'b']);
    });
  
    it('should dedupe an array without duplicate number entries', function() {
      var a = [1, 3, 2];
      var b = uniq(a);
      b.should.eql([1, 3, 2]);
    });
  
    it('should dedupe an array without duplicate string entries', function() {
      var a = ['a', 'c', 'b'];
      var b = uniq(a);
      b.should.eql(['a', 'c', 'b']);
    });
  
    it('should allow null/undefined array', function() {
      var a = null;
      var b = uniq(a);
      b.should.eql([]);
    });
  
    it('should report error for non-array arg', function() {
      var a = '1';
      try {
        var b = uniq(a);
        throw new Error('The test should have thrown an error');
      } catch (err) {
        err.should.be.instanceof(Error);
      }
    });
  });
  
  describe('util.toRegExp', function() {
    var invalidDataTypes;
    var validDataTypes;
  
    before(function() {
      invalidDataTypes = [0, true, {}, [], Function, null];
      validDataTypes = ['string', /^regex/, new RegExp(/^regex/)];
    });
  
    it('should not accept invalid data types', function() {
      invalidDataTypes.forEach(function(invalid) {
        utils.toRegExp(invalid).should.be.an.Error;
      });
    });
  
    it('should accept valid data types', function() {
      validDataTypes.forEach(function(valid) {
        utils.toRegExp(valid).should.not.be.an.Error;
      });
    });
  
    context('with a regex string', function() {
      it('should return a RegExp object when no regex flags are provided',
          function() {
            utils.toRegExp('^regex$').should.be.an.instanceOf(RegExp);
          });
  
      it('should throw an error when invalid regex flags are provided',
          function() {
            utils.toRegExp('^regex$/abc').should.be.an.Error;
          });
  
      it('should return a RegExp object when valid flags are provided',
          function() {
            utils.toRegExp('regex/igm').should.be.an.instanceOf(RegExp);
          });
    });
  
    context('with a regex literal', function() {
      it('should return a RegExp object', function() {
        utils.toRegExp(/^regex$/igm).should.be.an.instanceOf(RegExp);
      });
    });
  
    context('with a regex object', function() {
      it('should return a RegExp object', function() {
        utils.toRegExp(new RegExp('^regex$', 'igm')).should.be.an.instanceOf(RegExp);
      });
    });
  });
  
  describe('util.hasRegExpFlags', function() {
    context('with a regex string', function() {
      it('should be true when the regex has invalid flags', function() {
        utils.hasRegExpFlags('^regex$/abc').should.be.ok;
      });
  
      it('should be true when the regex has valid flags', function() {
        utils.hasRegExpFlags('^regex$/igm').should.be.ok;
      });
  
      it('should be false when the regex has no flags', function() {
        utils.hasRegExpFlags('^regex$').should.not.be.ok;
        utils.hasRegExpFlags('^regex$/').should.not.be.ok;
      });
    });
  
    context('with a regex literal', function() {
      it('should be true when the regex has valid flags', function() {
        utils.hasRegExpFlags(/^regex$/igm).should.be.ok;
      });
  
      it('should be false when the regex has no flags', function() {
        utils.hasRegExpFlags(/^regex$/).should.not.be.ok;
      });
    });
  
    context('with a regex object', function() {
      it('should be true when the regex has valid flags', function() {
        utils.hasRegExpFlags(new RegExp(/^regex$/igm)).should.be.ok;
      });
  
      it('should be false when the regex has no flags', function() {
        utils.hasRegExpFlags(new RegExp(/^regex$/)).should.not.be.ok;
      });
    });
  });