package propertystreams

import (
	"fmt"
	vocab "github.com/go-fed/activity/streams/vocab"
	"net/url"
)

// StreamsPropertyIterator is an iterator for a property. It is permitted to be
// one of multiple value types. At most, one type of value can be present, or
// none at all. Setting a value will clear the other types of values so that
// only one of the 'Is' methods will return true. It is possible to clear all
// values, so that this property is empty.
type StreamsPropertyIterator struct {
	OrderedCollectionMember     vocab.OrderedCollectionInterface
	CollectionMember            vocab.CollectionInterface
	CollectionPageMember        vocab.CollectionPageInterface
	OrderedCollectionPageMember vocab.OrderedCollectionPageInterface
	unknown                     interface{}
	iri                         *url.URL
	alias                       string
	myIdx                       int
	parent                      vocab.StreamsPropertyInterface
}

// NewStreamsPropertyIterator creates a new streams property.
func NewStreamsPropertyIterator() *StreamsPropertyIterator {
	return &StreamsPropertyIterator{alias: ""}
}

// deserializeStreamsPropertyIterator creates an iterator from an element that has
// been unmarshalled from a text or binary format.
func deserializeStreamsPropertyIterator(i interface{}, aliasMap map[string]string) (*StreamsPropertyIterator, error) {
	alias := ""
	if a, ok := aliasMap["https://www.w3.org/TR/activitystreams-vocabulary"]; ok {
		alias = a
	}
	if s, ok := i.(string); ok {
		u, err := url.Parse(s)
		// If error exists, don't error out -- skip this and treat as unknown string ([]byte) at worst
		// Also, if no scheme exists, don't treat it as a URL -- net/url is greedy
		if err == nil && len(u.Scheme) > 0 {
			this := &StreamsPropertyIterator{
				alias: alias,
				iri:   u,
			}
			return this, nil
		}
	}
	if m, ok := i.(map[string]interface{}); ok {
		if v, err := mgr.DeserializeOrderedCollectionActivityStreams()(m, aliasMap); err == nil {
			this := &StreamsPropertyIterator{
				OrderedCollectionMember: v,
				alias:                   alias,
			}
			return this, nil
		} else if v, err := mgr.DeserializeCollectionActivityStreams()(m, aliasMap); err == nil {
			this := &StreamsPropertyIterator{
				CollectionMember: v,
				alias:            alias,
			}
			return this, nil
		} else if v, err := mgr.DeserializeCollectionPageActivityStreams()(m, aliasMap); err == nil {
			this := &StreamsPropertyIterator{
				CollectionPageMember: v,
				alias:                alias,
			}
			return this, nil
		} else if v, err := mgr.DeserializeOrderedCollectionPageActivityStreams()(m, aliasMap); err == nil {
			this := &StreamsPropertyIterator{
				OrderedCollectionPageMember: v,
				alias:                       alias,
			}
			return this, nil
		}
	}
	this := &StreamsPropertyIterator{
		alias:   alias,
		unknown: i,
	}
	return this, nil
}

// GetCollection returns the value of this property. When IsCollection returns
// false, GetCollection will return an arbitrary value.
func (this StreamsPropertyIterator) GetCollection() vocab.CollectionInterface {
	return this.CollectionMember
}

// GetCollectionPage returns the value of this property. When IsCollectionPage
// returns false, GetCollectionPage will return an arbitrary value.
func (this StreamsPropertyIterator) GetCollectionPage() vocab.CollectionPageInterface {
	return this.CollectionPageMember
}

// GetIRI returns the IRI of this property. When IsIRI returns false, GetIRI will
// return an arbitrary value.
func (this StreamsPropertyIterator) GetIRI() *url.URL {
	return this.iri
}

// GetOrderedCollection returns the value of this property. When
// IsOrderedCollection returns false, GetOrderedCollection will return an
// arbitrary value.
func (this StreamsPropertyIterator) GetOrderedCollection() vocab.OrderedCollectionInterface {
	return this.OrderedCollectionMember
}

// GetOrderedCollectionPage returns the value of this property. When
// IsOrderedCollectionPage returns false, GetOrderedCollectionPage will return
// an arbitrary value.
func (this StreamsPropertyIterator) GetOrderedCollectionPage() vocab.OrderedCollectionPageInterface {
	return this.OrderedCollectionPageMember
}

// HasAny returns true if any of the different values is set.
func (this StreamsPropertyIterator) HasAny() bool {
	return this.IsOrderedCollection() ||
		this.IsCollection() ||
		this.IsCollectionPage() ||
		this.IsOrderedCollectionPage() ||
		this.iri != nil
}

// IsCollection returns true if this property has a type of "Collection". When
// true, use the GetCollection and SetCollection methods to access and set
// this property.
func (this StreamsPropertyIterator) IsCollection() bool {
	return this.CollectionMember != nil
}

// IsCollectionPage returns true if this property has a type of "CollectionPage".
// When true, use the GetCollectionPage and SetCollectionPage methods to
// access and set this property.
func (this StreamsPropertyIterator) IsCollectionPage() bool {
	return this.CollectionPageMember != nil
}

// IsIRI returns true if this property is an IRI. When true, use GetIRI and SetIRI
// to access and set this property
func (this StreamsPropertyIterator) IsIRI() bool {
	return this.iri != nil
}

// IsOrderedCollection returns true if this property has a type of
// "OrderedCollection". When true, use the GetOrderedCollection and
// SetOrderedCollection methods to access and set this property.
func (this StreamsPropertyIterator) IsOrderedCollection() bool {
	return this.OrderedCollectionMember != nil
}

// IsOrderedCollectionPage returns true if this property has a type of
// "OrderedCollectionPage". When true, use the GetOrderedCollectionPage and
// SetOrderedCollectionPage methods to access and set this property.
func (this StreamsPropertyIterator) IsOrderedCollectionPage() bool {
	return this.OrderedCollectionPageMember != nil
}

// JSONLDContext returns the JSONLD URIs required in the context string for this
// property and the specific values that are set. The value in the map is the
// alias used to import the property's value or values.
func (this StreamsPropertyIterator) JSONLDContext() map[string]string {
	m := map[string]string{"https://www.w3.org/TR/activitystreams-vocabulary": this.alias}
	var child map[string]string
	if this.IsOrderedCollection() {
		child = this.GetOrderedCollection().JSONLDContext()
	} else if this.IsCollection() {
		child = this.GetCollection().JSONLDContext()
	} else if this.IsCollectionPage() {
		child = this.GetCollectionPage().JSONLDContext()
	} else if this.IsOrderedCollectionPage() {
		child = this.GetOrderedCollectionPage().JSONLDContext()
	}
	/*
	   Since the literal maps in this function are determined at
	   code-generation time, this loop should not overwrite an existing key with a
	   new value.
	*/
	for k, v := range child {
		m[k] = v
	}
	return m
}

// KindIndex computes an arbitrary value for indexing this kind of value. This is
// a leaky API detail only for folks looking to replace the go-fed
// implementation. Applications should not use this method.
func (this StreamsPropertyIterator) KindIndex() int {
	if this.IsOrderedCollection() {
		return 0
	}
	if this.IsCollection() {
		return 1
	}
	if this.IsCollectionPage() {
		return 2
	}
	if this.IsOrderedCollectionPage() {
		return 3
	}
	if this.IsIRI() {
		return -2
	}
	return -1
}

// LessThan compares two instances of this property with an arbitrary but stable
// comparison. Applications should not use this because it is only meant to
// help alternative implementations to go-fed to be able to normalize
// nonfunctional properties.
func (this StreamsPropertyIterator) LessThan(o vocab.StreamsPropertyIteratorInterface) bool {
	idx1 := this.KindIndex()
	idx2 := o.KindIndex()
	if idx1 < idx2 {
		return true
	} else if idx1 > idx2 {
		return false
	} else if this.IsOrderedCollection() {
		return this.GetOrderedCollection().LessThan(o.GetOrderedCollection())
	} else if this.IsCollection() {
		return this.GetCollection().LessThan(o.GetCollection())
	} else if this.IsCollectionPage() {
		return this.GetCollectionPage().LessThan(o.GetCollectionPage())
	} else if this.IsOrderedCollectionPage() {
		return this.GetOrderedCollectionPage().LessThan(o.GetOrderedCollectionPage())
	} else if this.IsIRI() {
		return this.iri.String() < o.GetIRI().String()
	}
	return false
}

// Name returns the name of this property: "streams".
func (this StreamsPropertyIterator) Name() string {
	return "streams"
}

// Next returns the next iterator, or nil if there is no next iterator.
func (this StreamsPropertyIterator) Next() vocab.StreamsPropertyIteratorInterface {
	if this.myIdx+1 >= this.parent.Len() {
		return nil
	} else {
		return this.parent.At(this.myIdx + 1)
	}
}

// Prev returns the previous iterator, or nil if there is no previous iterator.
func (this StreamsPropertyIterator) Prev() vocab.StreamsPropertyIteratorInterface {
	if this.myIdx-1 < 0 {
		return nil
	} else {
		return this.parent.At(this.myIdx - 1)
	}
}

// SetCollection sets the value of this property. Calling IsCollection afterwards
// returns true.
func (this *StreamsPropertyIterator) SetCollection(v vocab.CollectionInterface) {
	this.clear()
	this.CollectionMember = v
}

// SetCollectionPage sets the value of this property. Calling IsCollectionPage
// afterwards returns true.
func (this *StreamsPropertyIterator) SetCollectionPage(v vocab.CollectionPageInterface) {
	this.clear()
	this.CollectionPageMember = v
}

// SetIRI sets the value of this property. Calling IsIRI afterwards returns true.
func (this *StreamsPropertyIterator) SetIRI(v *url.URL) {
	this.clear()
	this.iri = v
}

// SetOrderedCollection sets the value of this property. Calling
// IsOrderedCollection afterwards returns true.
func (this *StreamsPropertyIterator) SetOrderedCollection(v vocab.OrderedCollectionInterface) {
	this.clear()
	this.OrderedCollectionMember = v
}

// SetOrderedCollectionPage sets the value of this property. Calling
// IsOrderedCollectionPage afterwards returns true.
func (this *StreamsPropertyIterator) SetOrderedCollectionPage(v vocab.OrderedCollectionPageInterface) {
	this.clear()
	this.OrderedCollectionPageMember = v
}

// clear ensures no value of this property is set. Calling HasAny or any of the
// 'Is' methods afterwards will return false.
func (this *StreamsPropertyIterator) clear() {
	this.OrderedCollectionMember = nil
	this.CollectionMember = nil
	this.CollectionPageMember = nil
	this.OrderedCollectionPageMember = nil
	this.unknown = nil
	this.iri = nil
}

// serialize converts this into an interface representation suitable for
// marshalling into a text or binary format. Applications should not need this
// function as most typical use cases serialize types instead of individual
// properties. It is exposed for alternatives to go-fed implementations to use.
func (this StreamsPropertyIterator) serialize() (interface{}, error) {
	if this.IsOrderedCollection() {
		return this.GetOrderedCollection().Serialize()
	} else if this.IsCollection() {
		return this.GetCollection().Serialize()
	} else if this.IsCollectionPage() {
		return this.GetCollectionPage().Serialize()
	} else if this.IsOrderedCollectionPage() {
		return this.GetOrderedCollectionPage().Serialize()
	} else if this.IsIRI() {
		return this.iri.String(), nil
	}
	return this.unknown, nil
}

// StreamsProperty is the non-functional property "streams". It is permitted to
// have one or more values, and of different value types.
type StreamsProperty struct {
	properties []*StreamsPropertyIterator
	alias      string
}

// DeserializeStreamsProperty creates a "streams" property from an interface
// representation that has been unmarshalled from a text or binary format.
func DeserializeStreamsProperty(m map[string]interface{}, aliasMap map[string]string) (vocab.StreamsPropertyInterface, error) {
	alias := ""
	if a, ok := aliasMap["https://www.w3.org/TR/activitystreams-vocabulary"]; ok {
		alias = a
	}
	propName := "streams"
	if len(alias) > 0 {
		propName = fmt.Sprintf("%s:%s", alias, "streams")
	}
	i, ok := m[propName]

	if ok {
		this := &StreamsProperty{
			alias:      alias,
			properties: []*StreamsPropertyIterator{},
		}
		if list, ok := i.([]interface{}); ok {
			for _, iterator := range list {
				if p, err := deserializeStreamsPropertyIterator(iterator, aliasMap); err != nil {
					return this, err
				} else if p != nil {
					this.properties = append(this.properties, p)
				}
			}
		} else {
			if p, err := deserializeStreamsPropertyIterator(i, aliasMap); err != nil {
				return this, err
			} else if p != nil {
				this.properties = append(this.properties, p)
			}
		}
		// Set up the properties for iteration.
		for idx, ele := range this.properties {
			ele.parent = this
			ele.myIdx = idx
		}
		return this, nil
	}
	return nil, nil
}

// NewStreamsProperty creates a new streams property.
func NewStreamsProperty() *StreamsProperty {
	return &StreamsProperty{alias: ""}
}

// AppendCollection appends a Collection value to the back of a list of the
// property "streams". Invalidates iterators that are traversing using Prev.
func (this *StreamsProperty) AppendCollection(v vocab.CollectionInterface) {
	this.properties = append(this.properties, &StreamsPropertyIterator{
		CollectionMember: v,
		alias:            this.alias,
		myIdx:            this.Len(),
		parent:           this,
	})
}

// AppendCollectionPage appends a CollectionPage value to the back of a list of
// the property "streams". Invalidates iterators that are traversing using
// Prev.
func (this *StreamsProperty) AppendCollectionPage(v vocab.CollectionPageInterface) {
	this.properties = append(this.properties, &StreamsPropertyIterator{
		CollectionPageMember: v,
		alias:                this.alias,
		myIdx:                this.Len(),
		parent:               this,
	})
}

// AppendIRI appends an IRI value to the back of a list of the property "streams"
func (this *StreamsProperty) AppendIRI(v *url.URL) {
	this.properties = append(this.properties, &StreamsPropertyIterator{
		alias:  this.alias,
		iri:    v,
		myIdx:  this.Len(),
		parent: this,
	})
}

// AppendOrderedCollection appends a OrderedCollection value to the back of a list
// of the property "streams". Invalidates iterators that are traversing using
// Prev.
func (this *StreamsProperty) AppendOrderedCollection(v vocab.OrderedCollectionInterface) {
	this.properties = append(this.properties, &StreamsPropertyIterator{
		OrderedCollectionMember: v,
		alias:                   this.alias,
		myIdx:                   this.Len(),
		parent:                  this,
	})
}

// AppendOrderedCollectionPage appends a OrderedCollectionPage value to the back
// of a list of the property "streams". Invalidates iterators that are
// traversing using Prev.
func (this *StreamsProperty) AppendOrderedCollectionPage(v vocab.OrderedCollectionPageInterface) {
	this.properties = append(this.properties, &StreamsPropertyIterator{
		OrderedCollectionPageMember: v,
		alias:                       this.alias,
		myIdx:                       this.Len(),
		parent:                      this,
	})
}

// At returns the property value for the specified index. Panics if the index is
// out of bounds.
func (this StreamsProperty) At(index int) vocab.StreamsPropertyIteratorInterface {
	return this.properties[index]
}

// Begin returns the first iterator, or nil if empty. Can be used with the
// iterator's Next method and this property's End method to iterate from front
// to back through all values.
func (this StreamsProperty) Begin() vocab.StreamsPropertyIteratorInterface {
	if this.Empty() {
		return nil
	} else {
		return this.properties[0]
	}
}

// Empty returns returns true if there are no elements.
func (this StreamsProperty) Empty() bool {
	return this.Len() == 0
}

// End returns beyond-the-last iterator, which is nil. Can be used with the
// iterator's Next method and this property's Begin method to iterate from
// front to back through all values.
func (this StreamsProperty) End() vocab.StreamsPropertyIteratorInterface {
	return nil
}

// JSONLDContext returns the JSONLD URIs required in the context string for this
// property and the specific values that are set. The value in the map is the
// alias used to import the property's value or values.
func (this StreamsProperty) JSONLDContext() map[string]string {
	m := map[string]string{"https://www.w3.org/TR/activitystreams-vocabulary": this.alias}
	for _, elem := range this.properties {
		child := elem.JSONLDContext()
		/*
		   Since the literal maps in this function are determined at
		   code-generation time, this loop should not overwrite an existing key with a
		   new value.
		*/
		for k, v := range child {
			m[k] = v
		}
	}
	return m
}

// KindIndex computes an arbitrary value for indexing this kind of value. This is
// a leaky API method specifically needed only for alternate implementations
// for go-fed. Applications should not use this method. Panics if the index is
// out of bounds.
func (this StreamsProperty) KindIndex(idx int) int {
	return this.properties[idx].KindIndex()
}

// Len returns the number of values that exist for the "streams" property.
func (this StreamsProperty) Len() (length int) {
	return len(this.properties)
}

// Less computes whether another property is less than this one. Mixing types
// results in a consistent but arbitrary ordering
func (this StreamsProperty) Less(i, j int) bool {
	idx1 := this.KindIndex(i)
	idx2 := this.KindIndex(j)
	if idx1 < idx2 {
		return true
	} else if idx1 == idx2 {
		if idx1 == 0 {
			lhs := this.properties[i].GetOrderedCollection()
			rhs := this.properties[j].GetOrderedCollection()
			return lhs.LessThan(rhs)
		} else if idx1 == 1 {
			lhs := this.properties[i].GetCollection()
			rhs := this.properties[j].GetCollection()
			return lhs.LessThan(rhs)
		} else if idx1 == 2 {
			lhs := this.properties[i].GetCollectionPage()
			rhs := this.properties[j].GetCollectionPage()
			return lhs.LessThan(rhs)
		} else if idx1 == 3 {
			lhs := this.properties[i].GetOrderedCollectionPage()
			rhs := this.properties[j].GetOrderedCollectionPage()
			return lhs.LessThan(rhs)
		} else if idx1 == -2 {
			lhs := this.properties[i].GetIRI()
			rhs := this.properties[j].GetIRI()
			return lhs.String() < rhs.String()
		}
	}
	return false
}

// LessThan compares two instances of this property with an arbitrary but stable
// comparison. Applications should not use this because it is only meant to
// help alternative implementations to go-fed to be able to normalize
// nonfunctional properties.
func (this StreamsProperty) LessThan(o vocab.StreamsPropertyInterface) bool {
	l1 := this.Len()
	l2 := o.Len()
	l := l1
	if l2 < l1 {
		l = l2
	}
	for i := 0; i < l; i++ {
		if this.properties[i].LessThan(o.At(i)) {
			return true
		} else if o.At(i).LessThan(this.properties[i]) {
			return false
		}
	}
	return l1 < l2
}

// Name returns the name of this property: "streams".
func (this StreamsProperty) Name() string {
	return "streams"
}

// PrependCollection prepends a Collection value to the front of a list of the
// property "streams". Invalidates all iterators.
func (this *StreamsProperty) PrependCollection(v vocab.CollectionInterface) {
	this.properties = append([]*StreamsPropertyIterator{{
		CollectionMember: v,
		alias:            this.alias,
		myIdx:            0,
		parent:           this,
	}}, this.properties...)
	for i := 1; i < this.Len(); i++ {
		(this.properties)[i].myIdx = i
	}
}

// PrependCollectionPage prepends a CollectionPage value to the front of a list of
// the property "streams". Invalidates all iterators.
func (this *StreamsProperty) PrependCollectionPage(v vocab.CollectionPageInterface) {
	this.properties = append([]*StreamsPropertyIterator{{
		CollectionPageMember: v,
		alias:                this.alias,
		myIdx:                0,
		parent:               this,
	}}, this.properties...)
	for i := 1; i < this.Len(); i++ {
		(this.properties)[i].myIdx = i
	}
}

// PrependIRI prepends an IRI value to the front of a list of the property
// "streams".
func (this *StreamsProperty) PrependIRI(v *url.URL) {
	this.properties = append([]*StreamsPropertyIterator{{
		alias:  this.alias,
		iri:    v,
		myIdx:  0,
		parent: this,
	}}, this.properties...)
	for i := 1; i < this.Len(); i++ {
		(this.properties)[i].myIdx = i
	}
}

// PrependOrderedCollection prepends a OrderedCollection value to the front of a
// list of the property "streams". Invalidates all iterators.
func (this *StreamsProperty) PrependOrderedCollection(v vocab.OrderedCollectionInterface) {
	this.properties = append([]*StreamsPropertyIterator{{
		OrderedCollectionMember: v,
		alias:                   this.alias,
		myIdx:                   0,
		parent:                  this,
	}}, this.properties...)
	for i := 1; i < this.Len(); i++ {
		(this.properties)[i].myIdx = i
	}
}

// PrependOrderedCollectionPage prepends a OrderedCollectionPage value to the
// front of a list of the property "streams". Invalidates all iterators.
func (this *StreamsProperty) PrependOrderedCollectionPage(v vocab.OrderedCollectionPageInterface) {
	this.properties = append([]*StreamsPropertyIterator{{
		OrderedCollectionPageMember: v,
		alias:                       this.alias,
		myIdx:                       0,
		parent:                      this,
	}}, this.properties...)
	for i := 1; i < this.Len(); i++ {
		(this.properties)[i].myIdx = i
	}
}

// Remove deletes an element at the specified index from a list of the property
// "streams", regardless of its type. Panics if the index is out of bounds.
// Invalidates all iterators.
func (this *StreamsProperty) Remove(idx int) {
	(this.properties)[idx].parent = nil
	copy((this.properties)[idx:], (this.properties)[idx+1:])
	(this.properties)[len(this.properties)-1] = &StreamsPropertyIterator{}
	this.properties = (this.properties)[:len(this.properties)-1]
	for i := idx; i < this.Len(); i++ {
		(this.properties)[i].myIdx = i
	}
}

// Serialize converts this into an interface representation suitable for
// marshalling into a text or binary format. Applications should not need this
// function as most typical use cases serialize types instead of individual
// properties. It is exposed for alternatives to go-fed implementations to use.
func (this StreamsProperty) Serialize() (interface{}, error) {
	s := make([]interface{}, 0, len(this.properties))
	for _, iterator := range this.properties {
		if b, err := iterator.serialize(); err != nil {
			return s, err
		} else {
			s = append(s, b)
		}
	}
	// Shortcut: if serializing one value, don't return an array -- pretty sure other Fediverse software would choke on a "type" value with array, for example.
	if len(s) == 1 {
		return s[0], nil
	}
	return s, nil
}

// SetCollection sets a Collection value to be at the specified index for the
// property "streams". Panics if the index is out of bounds. Invalidates all
// iterators.
func (this *StreamsProperty) SetCollection(idx int, v vocab.CollectionInterface) {
	(this.properties)[idx].parent = nil
	(this.properties)[idx] = &StreamsPropertyIterator{
		CollectionMember: v,
		alias:            this.alias,
		myIdx:            idx,
		parent:           this,
	}
}

// SetCollectionPage sets a CollectionPage value to be at the specified index for
// the property "streams". Panics if the index is out of bounds. Invalidates
// all iterators.
func (this *StreamsProperty) SetCollectionPage(idx int, v vocab.CollectionPageInterface) {
	(this.properties)[idx].parent = nil
	(this.properties)[idx] = &StreamsPropertyIterator{
		CollectionPageMember: v,
		alias:                this.alias,
		myIdx:                idx,
		parent:               this,
	}
}

// SetIRI sets an IRI value to be at the specified index for the property
// "streams". Panics if the index is out of bounds.
func (this *StreamsProperty) SetIRI(idx int, v *url.URL) {
	(this.properties)[idx].parent = nil
	(this.properties)[idx] = &StreamsPropertyIterator{
		alias:  this.alias,
		iri:    v,
		myIdx:  idx,
		parent: this,
	}
}

// SetOrderedCollection sets a OrderedCollection value to be at the specified
// index for the property "streams". Panics if the index is out of bounds.
// Invalidates all iterators.
func (this *StreamsProperty) SetOrderedCollection(idx int, v vocab.OrderedCollectionInterface) {
	(this.properties)[idx].parent = nil
	(this.properties)[idx] = &StreamsPropertyIterator{
		OrderedCollectionMember: v,
		alias:                   this.alias,
		myIdx:                   idx,
		parent:                  this,
	}
}

// SetOrderedCollectionPage sets a OrderedCollectionPage value to be at the
// specified index for the property "streams". Panics if the index is out of
// bounds. Invalidates all iterators.
func (this *StreamsProperty) SetOrderedCollectionPage(idx int, v vocab.OrderedCollectionPageInterface) {
	(this.properties)[idx].parent = nil
	(this.properties)[idx] = &StreamsPropertyIterator{
		OrderedCollectionPageMember: v,
		alias:                       this.alias,
		myIdx:                       idx,
		parent:                      this,
	}
}

// Swap swaps the location of values at two indices for the "streams" property.
func (this StreamsProperty) Swap(i, j int) {
	this.properties[i], this.properties[j] = this.properties[j], this.properties[i]
}