package rui

import (
	"fmt"
	"strconv"
	"strings"
)

// Frame - the location and size of a rectangle area
type Frame struct {
	// Left - the left border
	Left float64
	// Top - the top border
	Top float64
	// Width - the width of a rectangle area
	Width float64
	// Height - the height of a rectangle area
	Height float64
}

// Right returns the right border
func (frame Frame) Right() float64 {
	return frame.Left + frame.Width
}

// Bottom returns the bottom border
func (frame Frame) Bottom() float64 {
	return frame.Top + frame.Height
}

// View represents a base view interface
type View interface {
	ViewStyle
	fmt.Stringer

	// Session returns the current Session interface
	Session() Session

	// Parent returns the parent view
	Parent() View

	// Tag returns the tag of View interface
	Tag() string

	// ID returns the id of the view
	ID() string

	// Focusable returns true if the view receives the focus
	Focusable() bool

	// Frame returns the location and size of the view in pixels
	Frame() Frame

	// Scroll returns the location size of the scrollable view in pixels
	Scroll() Frame

	// SetParams sets properties with name "tag" of the "rootView" subview. Result:
	// * true - all properties were set successful,
	// * false - error (incompatible type or invalid format of a string value, see AppLog).
	SetParams(params Params) bool

	// SetAnimated sets the value (second argument) of the property with name defined by the first argument.
	// Return "true" if the value has been set, in the opposite case "false" are returned and
	// a description of the error is written to the log
	SetAnimated(tag PropertyName, value any, animation Animation) bool

	// SetChangeListener set the function to track the change of the View property
	SetChangeListener(tag PropertyName, listener func(View, PropertyName))

	// HasFocus returns 'true' if the view has focus
	HasFocus() bool

	init(session Session)
	handleCommand(self View, command PropertyName, data DataObject) bool
	htmlClass(disabled bool) string
	htmlTag() string
	closeHTMLTag() bool
	htmlID() string
	parentHTMLID() string
	setParentID(parentID string)
	htmlSubviews(self View, buffer *strings.Builder)
	htmlProperties(self View, buffer *strings.Builder)
	cssStyle(self View, builder cssBuilder)
	addToCSSStyle(addCSS map[string]string)
	exscludeTags() []PropertyName
	htmlDisabledProperty() bool

	onResize(self View, x, y, width, height float64)
	onItemResize(self View, index string, x, y, width, height float64)
	setNoResizeEvent()
	isNoResizeEvent() bool
	setScroll(x, y, width, height float64)
}

// viewData - base implementation of View interface
type viewData struct {
	viewStyle
	session          Session
	tag              string
	viewID           string
	_htmlID          string
	parentID         string
	systemClass      string
	changeListener   map[PropertyName]func(View, PropertyName)
	singleTransition map[PropertyName]Animation
	addCSS           map[string]string
	frame            Frame
	scroll           Frame
	noResizeEvent    bool
	created          bool
	hasFocus         bool
	hasHtmlDisabled  bool
	getFunc          func(view View, tag PropertyName) any
	set              func(view View, tag PropertyName, value any) []PropertyName
	remove           func(view View, tag PropertyName) []PropertyName
	changed          func(view View, tag PropertyName)
}

func newView(session Session) View {
	return new(viewData)
}

// NewView create new View object and return it
func NewView(session Session, params Params) View {
	view := new(viewData)
	view.init(session)
	setInitParams(view, params)
	return view
}

func setInitParams(view View, params Params) {
	if params != nil {
		session := view.Session()
		if !session.ignoreViewUpdates() {
			session.setIgnoreViewUpdates(true)
			defer session.setIgnoreViewUpdates(false)
		}
		for _, tag := range params.AllTags() {
			if value, ok := params[tag]; ok {
				view.Set(tag, value)
			}
		}
	}
}

func (view *viewData) init(session Session) {
	view.viewStyle.init()
	view.getFunc = viewGet
	view.set = viewSet
	view.normalize = normalizeViewTag
	view.changed = viewPropertyChanged
	view.tag = "View"
	view.session = session
	view.changeListener = map[PropertyName]func(View, PropertyName){}
	view.addCSS = map[string]string{}
	//view.animation = map[string]AnimationEndListener{}
	view.singleTransition = map[PropertyName]Animation{}
	view.noResizeEvent = false
	view.created = false
	view.hasHtmlDisabled = false
}

func (view *viewData) Session() Session {
	return view.session
}

func (view *viewData) Parent() View {
	return view.session.viewByHTMLID(view.parentID)
}

func (view *viewData) parentHTMLID() string {
	return view.parentID
}

func (view *viewData) setParentID(parentID string) {
	view.parentID = parentID
}

func (view *viewData) Tag() string {
	return view.tag
}

func (view *viewData) ID() string {
	return view.viewID
}

func (view *viewData) ViewByID(id string) View {
	if id == view.ID() {
		if v := view.session.viewByHTMLID(view.htmlID()); v != nil {
			return v
		}
		return view
	}
	return nil
}

func (view *viewData) Focusable() bool {
	if focus, ok := boolProperty(view, Focusable, view.session); ok {
		return focus
	}

	if style, ok := stringProperty(view, Style, view.session); ok {
		if style, ok := view.session.resolveConstants(style); ok {
			if value := view.session.styleProperty(style, Focusable); ok {
				if focus, ok := valueToBool(value, view.Session()); ok {
					return focus
				}
			}
		}
	}

	return false
}

func (view *viewData) Remove(tag PropertyName) {
	tag = view.normalize(tag)
	var changedTags []PropertyName = nil

	switch tag {
	case ID:
		if view.viewID != "" {
			view.viewID = ""
			changedTags = []PropertyName{ID}
		}

	case AnimationTag:
		if val := view.getRaw(AnimationTag); val != nil {
			if animations, ok := val.([]Animation); ok {
				for _, animation := range animations {
					animation.unused(view.session)
				}
			}

			view.setRaw(AnimationTag, nil)
			changedTags = []PropertyName{AnimationTag}
		}

	default:
		changedTags = view.remove(view, tag)
	}

	if view.created && len(changedTags) > 0 {
		for _, tag := range changedTags {
			view.changed(view, tag)
		}

		for _, tag := range changedTags {
			if listener, ok := view.changeListener[tag]; ok {
				listener(view, tag)
			}
		}
	}
}

func (view *viewData) Set(tag PropertyName, value any) bool {
	if value == nil {
		view.Remove(tag)
		return true
	}

	tag = view.normalize(tag)
	var changedTags []PropertyName = nil

	switch tag {
	case ID:
		text, ok := value.(string)
		if !ok {
			notCompatibleType(ID, value)
			return false
		}
		view.viewID = text
		changedTags = []PropertyName{ID}

	case AnimationTag:
		oldAnimations := []Animation{}
		if val := view.getRaw(AnimationTag); val != nil {
			if animation, ok := val.([]Animation); ok {
				oldAnimations = animation
			}
		}

		if !setAnimationProperty(view, tag, value) {
			return false
		}

		for _, animation := range oldAnimations {
			animation.unused(view.session)
		}
		changedTags = []PropertyName{AnimationTag}

	default:
		changedTags = viewSet(view, tag, value)
	}

	if view.created && len(changedTags) > 0 {
		for _, tag := range changedTags {
			view.changed(view, tag)
		}

		for _, tag := range changedTags {
			if listener, ok := view.changeListener[tag]; ok {
				listener(view, tag)
			}
		}
	}

	return changedTags != nil
}

func normalizeViewTag(tag PropertyName) PropertyName {
	tag = normalizeViewStyleTag(tag)
	switch tag {
	case "tab-index":
		return TabIndex
	}
	return tag
}

/*
func (view *viewData) propertyChangedEvent(tag PropertyName) {
	if listener, ok := view.changeListener[tag]; ok {
		listener(view, tag)
	}

	switch tag {
	case BorderLeft, BorderRight, BorderTop, BorderBottom,
		BorderStyle, BorderLeftStyle, BorderRightStyle, BorderTopStyle, BorderBottomStyle,
		BorderColor, BorderLeftColor, BorderRightColor, BorderTopColor, BorderBottomColor,
		BorderWidth, BorderLeftWidth, BorderRightWidth, BorderTopWidth, BorderBottomWidth:
		tag = Border

	case CellBorderStyle, CellBorderColor, CellBorderWidth,
		CellBorderLeft, CellBorderLeftStyle, CellBorderLeftColor, CellBorderLeftWidth,
		CellBorderRight, CellBorderRightStyle, CellBorderRightColor, CellBorderRightWidth,
		CellBorderTop, CellBorderTopStyle, CellBorderTopColor, CellBorderTopWidth,
		CellBorderBottom, CellBorderBottomStyle, CellBorderBottomColor, CellBorderBottomWidth:
		tag = CellBorder

	case OutlineColor, OutlineStyle, OutlineWidth:
		tag = Outline

	case RadiusX, RadiusY, RadiusTopLeft, RadiusTopLeftX, RadiusTopLeftY,
		RadiusTopRight, RadiusTopRightX, RadiusTopRightY,
		RadiusBottomLeft, RadiusBottomLeftX, RadiusBottomLeftY,
		RadiusBottomRight, RadiusBottomRightX, RadiusBottomRightY:
		tag = Radius

	case MarginTop, MarginRight, MarginBottom, MarginLeft,
		"top-margin", "right-margin", "bottom-margin", "left-margin":
		tag = Margin

	case PaddingTop, PaddingRight, PaddingBottom, PaddingLeft,
		"top-padding", "right-padding", "bottom-padding", "left-padding":
		tag = Padding

	case CellPaddingTop, CellPaddingRight, CellPaddingBottom, CellPaddingLeft:
		tag = CellPadding

	case ColumnSeparatorStyle, ColumnSeparatorWidth, ColumnSeparatorColor:
		tag = ColumnSeparator

	default:
		return
	}

	if listener, ok := view.changeListener[tag]; ok {
		listener(view, tag)
	}
}
*/

func viewRemove(properties Properties, tag PropertyName) []PropertyName {
	return viewStyleRemove(properties, tag)
}

func viewSet(view View, tag PropertyName, value any) []PropertyName {

	switch tag {

	case TabIndex, "tab-index":
		return setIntProperty(view, TabIndex, value)

	case UserData:
		view.setRaw(tag, value)
		return []PropertyName{UserData}

	case Style, StyleDisabled:
		if text, ok := value.(string); ok {
			view.setRaw(tag, text)
			return []PropertyName{tag}
		}
		notCompatibleType(ID, value)
		return nil

	case FocusEvent, LostFocusEvent:
		return setNoParamEventListener[View](view, tag, value)

	case KeyDownEvent, KeyUpEvent:
		return setViewEventListener[View, KeyEvent](view, tag, value)

	case ClickEvent, DoubleClickEvent, MouseDown, MouseUp, MouseMove, MouseOut, MouseOver, ContextMenuEvent:
		return setViewEventListener[View, MouseEvent](view, tag, value)

	case PointerDown, PointerUp, PointerMove, PointerOut, PointerOver, PointerCancel:
		return setViewEventListener[View, PointerEvent](view, tag, value)

	case TouchStart, TouchEnd, TouchMove, TouchCancel:
		return setViewEventListener[View, TouchEvent](view, tag, value)

	case TransitionRunEvent, TransitionStartEvent, TransitionEndEvent, TransitionCancelEvent,
		AnimationStartEvent, AnimationEndEvent, AnimationIterationEvent, AnimationCancelEvent:
		return setViewEventListener[View, string](view, tag, value)
		//return setTransitionListener(view, tag, value), tag
		//return setAnimationListener(view, tag, value), tag

	case ResizeEvent, ScrollEvent:
		return setViewEventListener[View, Frame](view, tag, value)
		//return setFrameListener(view, tag, value), tag
	}

	return viewStyleSet(view, tag, value)
}

func (view *viewData) SetParams(params Params) bool {
	if params == nil {
		errorLog("Argument of function SetParams is nil")
		return false
	}

	session := view.Session()
	session.startUpdateScript(view.htmlID())
	result := true
	for _, tag := range params.AllTags() {
		if value, ok := params[tag]; ok {
			result = view.Set(tag, value) && result
		}
	}
	session.finishUpdateScript(view.htmlID())
	return result
}

func viewPropertyChanged(view View, tag PropertyName) {
	/*
		if view.updateTransformProperty(tag) {
			return
		}
	*/

	htmlID := view.htmlID()
	session := view.Session()

	switch tag {
	case TabIndex:
		if value, ok := intProperty(view, TabIndex, view.Session(), 0); ok {
			session.updateProperty(view.htmlID(), "tabindex", strconv.Itoa(value))
		} else if view.Focusable() {
			session.updateProperty(view.htmlID(), "tabindex", "0")
		} else {
			session.updateProperty(view.htmlID(), "tabindex", "-1")
		}

	case Style, StyleDisabled:
		session.updateProperty(view.htmlID(), "class", view.htmlClass(IsDisabled(view)))

	case Disabled:
		tabIndex := GetTabIndex(view, htmlID)
		enabledClass := view.htmlClass(false)
		disabledClass := view.htmlClass(true)
		session.startUpdateScript(htmlID)
		if IsDisabled(view) {
			session.updateProperty(htmlID, "data-disabled", "1")
			if view.htmlDisabledProperty() {
				session.updateProperty(htmlID, "disabled", true)
			}
			if tabIndex >= 0 {
				session.updateProperty(htmlID, "tabindex", -1)
			}
			if enabledClass != disabledClass {
				session.updateProperty(htmlID, "class", disabledClass)
			}
		} else {
			session.updateProperty(htmlID, "data-disabled", "0")
			if view.htmlDisabledProperty() {
				session.removeProperty(htmlID, "disabled")
			}
			if tabIndex >= 0 {
				session.updateProperty(htmlID, "tabindex", tabIndex)
			}
			if enabledClass != disabledClass {
				session.updateProperty(htmlID, "class", enabledClass)
			}
		}
		session.finishUpdateScript(htmlID)
		updateInnerHTML(htmlID, session)

	case Visibility:
		switch GetVisibility(view) {
		case Invisible:
			session.updateCSSProperty(htmlID, string(Visibility), "hidden")
			session.updateCSSProperty(htmlID, "display", "")
			session.callFunc("hideTooltip")

		case Gone:
			session.updateCSSProperty(htmlID, string(Visibility), "hidden")
			session.updateCSSProperty(htmlID, "display", "none")
			session.callFunc("hideTooltip")

		default:
			session.updateCSSProperty(htmlID, string(Visibility), "visible")
			session.updateCSSProperty(htmlID, "display", "")
		}

	case Background:
		session.updateCSSProperty(htmlID, string(Background), backgroundCSS(view, session))

	case Border, BorderLeft, BorderRight, BorderTop, BorderBottom:
		cssWidth := ""
		cssColor := ""
		cssStyle := "none"

		if border := getBorderProperty(view, Border); border != nil {
			cssWidth = border.cssWidthValue(session)
			cssColor = border.cssColorValue(session)
			cssStyle = border.cssStyleValue(session)
		}

		session.updateCSSProperty(htmlID, string(BorderWidth), cssWidth)
		session.updateCSSProperty(htmlID, string(BorderColor), cssColor)
		session.updateCSSProperty(htmlID, string(BorderStyle), cssStyle)

	case BorderStyle, BorderLeftStyle, BorderRightStyle, BorderTopStyle, BorderBottomStyle:
		if border := getBorderProperty(view, Border); border != nil {
			session.updateCSSProperty(htmlID, string(BorderStyle), border.cssStyleValue(session))
		}

	case BorderColor, BorderLeftColor, BorderRightColor, BorderTopColor, BorderBottomColor:
		if border := getBorderProperty(view, Border); border != nil {
			session.updateCSSProperty(htmlID, string(BorderColor), border.cssColorValue(session))
		}

	case BorderWidth, BorderLeftWidth, BorderRightWidth, BorderTopWidth, BorderBottomWidth:
		if border := getBorderProperty(view, Border); border != nil {
			session.updateCSSProperty(htmlID, string(BorderWidth), border.cssWidthValue(session))
		}

	case Outline, OutlineColor, OutlineStyle, OutlineWidth:
		session.updateCSSProperty(htmlID, string(Outline), GetOutline(view).cssString(session))

	case Shadow:
		session.updateCSSProperty(htmlID, "box-shadow", shadowCSS(view, Shadow, session))

	case TextShadow:
		session.updateCSSProperty(htmlID, "text-shadow", shadowCSS(view, TextShadow, session))

	case Radius, RadiusX, RadiusY, RadiusTopLeft, RadiusTopLeftX, RadiusTopLeftY,
		RadiusTopRight, RadiusTopRightX, RadiusTopRightY,
		RadiusBottomLeft, RadiusBottomLeftX, RadiusBottomLeftY,
		RadiusBottomRight, RadiusBottomRightX, RadiusBottomRightY:
		radius := GetRadius(view)
		session.updateCSSProperty(htmlID, "border-radius", radius.cssString(session))

	case Margin, MarginTop, MarginRight, MarginBottom, MarginLeft,
		"top-margin", "right-margin", "bottom-margin", "left-margin":
		margin := GetMargin(view)
		session.updateCSSProperty(htmlID, string(Margin), margin.cssString(session))

	case Padding, PaddingTop, PaddingRight, PaddingBottom, PaddingLeft,
		"top-padding", "right-padding", "bottom-padding", "left-padding":
		padding := GetPadding(view)
		session.updateCSSProperty(htmlID, string(Padding), padding.cssString(session))

	case AvoidBreak:
		if avoid, ok := boolProperty(view, AvoidBreak, session); ok {
			if avoid {
				session.updateCSSProperty(htmlID, "break-inside", "avoid")
			} else {
				session.updateCSSProperty(htmlID, "break-inside", "auto")
			}
		}

	case Clip:
		if clip := getClipShape(view, Clip, session); clip != nil && clip.valid(session) {
			session.updateCSSProperty(htmlID, `clip-path`, clip.cssStyle(session))
		} else {
			session.updateCSSProperty(htmlID, `clip-path`, "none")
		}

	case ShapeOutside:
		if clip := getClipShape(view, ShapeOutside, session); clip != nil && clip.valid(session) {
			session.updateCSSProperty(htmlID, string(ShapeOutside), clip.cssStyle(session))
		} else {
			session.updateCSSProperty(htmlID, string(ShapeOutside), "none")
		}

	case Filter:
		text := ""
		if value := view.getRaw(Filter); value != nil {
			if filter, ok := value.(ViewFilter); ok {
				text = filter.cssStyle(session)
			}
		}
		session.updateCSSProperty(htmlID, string(Filter), text)

	case BackdropFilter:
		text := ""
		if value := view.getRaw(BackdropFilter); value != nil {
			if filter, ok := value.(ViewFilter); ok {
				text = filter.cssStyle(session)
			}
		}
		if session.startUpdateScript(htmlID) {
			defer session.finishUpdateScript(htmlID)
		}
		session.updateCSSProperty(htmlID, "-webkit-backdrop-filter", text)
		session.updateCSSProperty(htmlID, string(BackdropFilter), text)

	case FontName:
		if font, ok := stringProperty(view, FontName, session); ok {
			session.updateCSSProperty(htmlID, "font-family", font)
		} else {
			session.updateCSSProperty(htmlID, "font-family", "")
		}

	case Italic:
		if state, ok := boolProperty(view, tag, session); ok {
			if state {
				session.updateCSSProperty(htmlID, "font-style", "italic")
			} else {
				session.updateCSSProperty(htmlID, "font-style", "normal")
			}
		} else {
			session.updateCSSProperty(htmlID, "font-style", "")
		}

	case SmallCaps:
		if state, ok := boolProperty(view, tag, session); ok {
			if state {
				session.updateCSSProperty(htmlID, "font-variant", "small-caps")
			} else {
				session.updateCSSProperty(htmlID, "font-variant", "normal")
			}
		} else {
			session.updateCSSProperty(htmlID, "font-variant", "")
		}

	case Strikethrough, Overline, Underline:
		session.updateCSSProperty(htmlID, "text-decoration", textDecorationCSS(view, session))
		for _, tag2 := range []PropertyName{TextLineColor, TextLineStyle, TextLineThickness} {
			viewPropertyChanged(view, tag2)
		}

	case Transition:
		session.updateCSSProperty(htmlID, "transition", transitionCSS(view, session))

	case AnimationTag:
		session.updateCSSProperty(htmlID, "animation", animationCSS(view, session))

	case AnimationPaused:
		paused, ok := boolProperty(view, AnimationPaused, session)
		if !ok {
			session.updateCSSProperty(htmlID, `animation-play-state`, ``)
		} else if paused {
			session.updateCSSProperty(htmlID, `animation-play-state`, `paused`)
		} else {
			session.updateCSSProperty(htmlID, `animation-play-state`, `running`)
		}

	case ZIndex, Order, TabSize:
		if i, ok := intProperty(view, tag, session, 0); ok {
			session.updateCSSProperty(htmlID, string(tag), strconv.Itoa(i))
		} else {
			session.updateCSSProperty(htmlID, string(tag), "")
		}

	case Row, Column:
		if parentID := view.parentHTMLID(); parentID != "" {
			updateInnerHTML(parentID, session)
		}

	case UserSelect:
		if session.startUpdateScript(htmlID) {
			defer session.finishUpdateScript(htmlID)
		}
		if userSelect, ok := boolProperty(view, UserSelect, session); ok {
			if userSelect {
				session.updateCSSProperty(htmlID, "-webkit-user-select", "auto")
				session.updateCSSProperty(htmlID, "user-select", "auto")
			} else {
				session.updateCSSProperty(htmlID, "-webkit-user-select", "none")
				session.updateCSSProperty(htmlID, "user-select", "none")
			}
		} else {
			session.updateCSSProperty(htmlID, "-webkit-user-select", "")
			session.updateCSSProperty(htmlID, "user-select", "")
		}

	case ColumnSpanAll:
		if spanAll, ok := boolProperty(view, ColumnSpanAll, session); ok && spanAll {
			session.updateCSSProperty(htmlID, `column-span`, `all`)
		} else {
			session.updateCSSProperty(htmlID, `column-span`, `none`)
		}

	case Tooltip:
		if tooltip := GetTooltip(view); tooltip == "" {
			session.removeProperty(htmlID, "data-tooltip")
		} else {
			session.updateProperty(htmlID, "data-tooltip", tooltip)
			session.updateProperty(htmlID, "onmouseenter", "mouseEnterEvent(this, event)")
			session.updateProperty(htmlID, "onmouseleave", "mouseLeaveEvent(this, event)")
		}

	case PerspectiveOriginX, PerspectiveOriginY:
		if getTransform3D(view, session) {
			x, y := GetPerspectiveOrigin(view)
			value := ""
			if x.Type != Auto || y.Type != Auto {
				value = x.cssString("50%", session) + " " + y.cssString("50%", session)
			}
			session.updateCSSProperty(htmlID, "perspective-origin", value)
		}

	case BackfaceVisible:
		if getTransform3D(view, session) {
			if GetBackfaceVisible(view) {
				session.updateCSSProperty(htmlID, string(BackfaceVisible), "visible")
			} else {
				session.updateCSSProperty(htmlID, string(BackfaceVisible), "hidden")
			}
		}

	case OriginX, OriginY, OriginZ:
		x, y, z := getOrigin(view, session)
		value := ""

		if z.Type != Auto {
			value = x.cssString("50%", session) + " " + y.cssString("50%", session) + " " + z.cssString("50%", session)
		} else if x.Type != Auto || y.Type != Auto {
			value = x.cssString("50%", session) + " " + y.cssString("50%", session)
		}
		session.updateCSSProperty(htmlID, "transform-origin", value)

	case TransformTag, Perspective, SkewX, SkewY, TranslateX, TranslateY, TranslateZ,
		ScaleX, ScaleY, ScaleZ, Rotate, RotateX, RotateY, RotateZ:
		css := ""
		if transform := getTransformProperty(view); transform != nil {
			css = transform.transformCSS(session)
		}
		session.updateCSSProperty(htmlID, "transform", css)

	case FocusEvent, LostFocusEvent, ResizeEvent, ScrollEvent, KeyDownEvent, KeyUpEvent,
		ClickEvent, DoubleClickEvent, MouseDown, MouseUp, MouseMove, MouseOut, MouseOver, ContextMenuEvent,
		PointerDown, PointerUp, PointerMove, PointerOut, PointerOver, PointerCancel,
		TouchStart, TouchEnd, TouchMove, TouchCancel,
		TransitionRunEvent, TransitionStartEvent, TransitionEndEvent, TransitionCancelEvent,
		AnimationStartEvent, AnimationEndEvent, AnimationIterationEvent, AnimationCancelEvent:

		updateEventListenerHtml(view, tag)

	case DataList:
		updateInnerHTML(view.htmlID(), view.Session())

	default:
		if cssTag, ok := sizeProperties[tag]; ok {
			if size, ok := sizeProperty(view, tag, session); ok {
				session.updateCSSProperty(htmlID, cssTag, size.cssString("", session))
			} else {
				session.updateCSSProperty(htmlID, cssTag, "")
			}
			return
		}

		colorTags := map[PropertyName]string{
			BackgroundColor: string(BackgroundColor),
			TextColor:       "color",
			TextLineColor:   "text-decoration-color",
			CaretColor:      string(CaretColor),
			AccentColor:     string(AccentColor),
		}
		if cssTag, ok := colorTags[tag]; ok {
			if color, ok := colorProperty(view, tag, session); ok {
				session.updateCSSProperty(htmlID, cssTag, color.cssString())
			} else {
				session.updateCSSProperty(htmlID, cssTag, "")
			}
			return
		}

		if valuesData, ok := enumProperties[tag]; ok && valuesData.cssTag != "" {
			if n, ok := enumProperty(view, tag, session, 0); ok {
				session.updateCSSProperty(htmlID, valuesData.cssTag, valuesData.cssValues[n])
			} else {
				session.updateCSSProperty(htmlID, valuesData.cssTag, "")
			}
			return
		}

		if f, ok := floatTextProperty(view, Opacity, session, 0); ok {
			session.updateCSSProperty(htmlID, string(Opacity), f)
		} else {
			session.updateCSSProperty(htmlID, string(Opacity), "")
		}
	}
}

func viewGet(view View, tag PropertyName) any {
	if tag == ID {
		if id := view.ID(); id != "" {
			return id
		} else {
			return nil
		}
	}
	return viewStyleGet(view, tag)
}

func (view *viewData) htmlTag() string {
	if semantics := GetSemantics(view); semantics > DefaultSemantics {
		values := enumProperties[Semantics].cssValues
		if semantics < len(values) {
			return values[semantics]
		}
	}
	return "div"
}

func (view *viewData) closeHTMLTag() bool {
	return true
}

func (view *viewData) htmlID() string {
	if view._htmlID == "" {
		view._htmlID = view.session.nextViewID()
	}
	return view._htmlID
}

func (view *viewData) htmlSubviews(self View, buffer *strings.Builder) {
}

func (view *viewData) addToCSSStyle(addCSS map[string]string) {
	view.addCSS = addCSS
}

func (view *viewData) cssStyle(self View, builder cssBuilder) {
	view.viewStyle.cssViewStyle(builder, view.session)
	/*
		switch GetVisibility(view) {
		case Invisible:
			builder.add(`visibility`, `hidden`)

		case Gone:
			builder.add(`display`, `none`)
		}
	*/
	if view.addCSS != nil {
		for tag, value := range view.addCSS {
			builder.add(tag, value)
		}
	}
}

func (view *viewData) htmlDisabledProperty() bool {
	return view.hasHtmlDisabled
}

func (view *viewData) htmlProperties(self View, buffer *strings.Builder) {
	view.created = true

	if IsDisabled(self) {
		buffer.WriteString(` data-disabled="1"`)
		if view.hasHtmlDisabled {
			buffer.WriteString(`  disabled`)
		}
	} else {
		buffer.WriteString(` data-disabled="0"`)
	}

	if view.frame.Left != 0 || view.frame.Top != 0 || view.frame.Width != 0 || view.frame.Height != 0 {
		buffer.WriteString(fmt.Sprintf(` data-left="%g" data-top="%g" data-width="%g" data-height="%g"`,
			view.frame.Left, view.frame.Top, view.frame.Width, view.frame.Height))
	}
}

func viewHTML(view View, buffer *strings.Builder) {
	viewHTMLTag := view.htmlTag()
	buffer.WriteRune('<')
	buffer.WriteString(viewHTMLTag)
	buffer.WriteString(` id="`)
	buffer.WriteString(view.htmlID())
	buffer.WriteRune('"')

	disabled := IsDisabled(view)

	if cls := view.htmlClass(disabled); cls != "" {
		buffer.WriteString(` class="`)
		buffer.WriteString(cls)
		buffer.WriteRune('"')
	}

	cssBuilder := viewCSSBuilder{buffer: allocStringBuilder()}
	view.cssStyle(view, &cssBuilder)

	if style := cssBuilder.finish(); style != "" {
		buffer.WriteString(` style="`)
		buffer.WriteString(style)
		buffer.WriteRune('"')
	}

	buffer.WriteRune(' ')
	view.htmlProperties(view, buffer)

	if view.isNoResizeEvent() {
		buffer.WriteString(` data-noresize="1" `)
	} else {
		buffer.WriteRune(' ')
	}

	if !disabled {
		if tabIndex := GetTabIndex(view); tabIndex >= 0 {
			buffer.WriteString(`tabindex="`)
			buffer.WriteString(strconv.Itoa(tabIndex))
			buffer.WriteString(`" `)
		}
	}

	if tooltip := GetTooltip(view); tooltip != "" {
		buffer.WriteString(`data-tooltip=" `)
		buffer.WriteString(tooltip)
		buffer.WriteString(`" onmouseenter="mouseEnterEvent(this, event)" onmouseleave="mouseLeaveEvent(this, event)" `)
	}

	buffer.WriteString(`onscroll="scrollEvent(this, event)" `)

	focusEventsHtml(view, buffer)
	keyEventsHtml(view, buffer)

	viewEventsHtml[MouseEvent](view, []PropertyName{ClickEvent, DoubleClickEvent, MouseDown, MouseUp, MouseMove, MouseOut, MouseOver, ContextMenuEvent}, buffer)
	//mouseEventsHtml(view, buffer, hasTooltip)

	viewEventsHtml[PointerEvent](view, []PropertyName{PointerDown, PointerUp, PointerMove, PointerOut, PointerOver, PointerCancel}, buffer)
	//pointerEventsHtml(view, buffer)

	viewEventsHtml[TouchEvent](view, []PropertyName{TouchStart, TouchEnd, TouchMove, TouchCancel}, buffer)
	//touchEventsHtml(view, buffer)

	viewEventsHtml[string](view, []PropertyName{TransitionRunEvent, TransitionStartEvent, TransitionEndEvent, TransitionCancelEvent,
		AnimationStartEvent, AnimationEndEvent, AnimationIterationEvent, AnimationCancelEvent}, buffer)
	//transitionEventsHtml(view, buffer)
	//animationEventsHtml(view, buffer)

	buffer.WriteRune('>')
	view.htmlSubviews(view, buffer)
	if view.closeHTMLTag() {
		buffer.WriteString(`</`)
		buffer.WriteString(viewHTMLTag)
		buffer.WriteRune('>')
	}
}

func (view *viewData) htmlClass(disabled bool) string {
	cls := "ruiView"
	disabledStyle := false
	if disabled {
		if value, ok := stringProperty(view, StyleDisabled, view.Session()); ok && value != "" {
			cls += " " + value
			disabledStyle = true
		}
	}
	if !disabledStyle {
		if value, ok := stringProperty(view, Style, view.Session()); ok {
			cls += " " + value
		}
	}

	if view.systemClass != "" {
		cls = view.systemClass + " " + cls
	}

	return cls
}

func (view *viewData) handleCommand(self View, command PropertyName, data DataObject) bool {
	switch command {

	case KeyDownEvent, KeyUpEvent:
		if !IsDisabled(self) {
			handleKeyEvents(self, command, data)
		}

	case ClickEvent, DoubleClickEvent, MouseDown, MouseUp, MouseMove, MouseOut, MouseOver, ContextMenuEvent:
		handleMouseEvents(self, command, data)

	case PointerDown, PointerUp, PointerMove, PointerOut, PointerOver, PointerCancel:
		handlePointerEvents(self, command, data)

	case TouchStart, TouchEnd, TouchMove, TouchCancel:
		handleTouchEvents(self, command, data)

	case FocusEvent:
		view.hasFocus = true
		for _, listener := range getNoParamEventListeners[View](view, nil, command) {
			listener(self)
		}

	case LostFocusEvent:
		view.hasFocus = false
		for _, listener := range getNoParamEventListeners[View](view, nil, command) {
			listener(self)
		}

	case TransitionRunEvent, TransitionStartEvent, TransitionEndEvent, TransitionCancelEvent:
		view.handleTransitionEvents(command, data)

	case AnimationStartEvent, AnimationEndEvent, AnimationIterationEvent, AnimationCancelEvent:
		view.handleAnimationEvents(command, data)

	case "scroll":
		view.onScroll(view, dataFloatProperty(data, "x"), dataFloatProperty(data, "y"), dataFloatProperty(data, "width"), dataFloatProperty(data, "height"))

	case "widthChanged":
		if value, ok := data.PropertyValue("width"); ok {
			if width, ok := StringToSizeUnit(value); ok {
				self.setRaw(Width, width)
			}
		}

	case "heightChanged":
		if value, ok := data.PropertyValue("height"); ok {
			if height, ok := StringToSizeUnit(value); ok {
				self.setRaw(Height, height)
			}
		}

		/*
			case "resize":
				floatProperty := func(tag string) float64 {
					if value, ok := data.PropertyValue(tag); ok {
						if result, err := strconv.ParseFloat(value, 64); err == nil {
							return result
						}
					}
					return 0
				}

				self.onResize(self, floatProperty("x"), floatProperty("y"), floatProperty("width"), floatProperty("height"))
				return true
		*/
	default:
		return false
	}
	return true

}

func (view *viewData) SetChangeListener(tag PropertyName, listener func(View, PropertyName)) {
	if listener == nil {
		delete(view.changeListener, tag)
	} else {
		view.changeListener[tag] = listener
	}
}

func (view *viewData) HasFocus() bool {
	return view.hasFocus
}

func (view *viewData) String() string {
	buffer := allocStringBuilder()
	defer freeStringBuilder(buffer)
	writeViewStyle(view.tag, view, buffer, "", nil)
	return buffer.String()
}

func (view *viewData) exscludeTags() []PropertyName {
	return nil
}