// Copyright (c) 2026 Storm Dragon
// Authors: Storm Dragon, Angus Kola
// SPDX-License-Identifier: GPL-3.0-or-later

package app

import (
	"git.stormux.org/storm/cthulhu/internal/atspi"
	"git.stormux.org/storm/cthulhu/internal/presentation"
)

// The event loop owns this history. Some toolkits repeat focus on the semantic
// combo when its internal selection changes; that is not entry into a control.
type comboPresentation struct {
	focus atspi.ObjectID
	value string
}

func (history *comboPresentation) observe(event atspi.Event) (text string, update, duplicate bool) {
	focusGain := isFocusGainEvent(event)
	if event.Source.Role != "combo box" {
		if focusGain {
			history.focus, history.value = event.Source.ID(), ""
		}
		return "", false, false
	}
	if !focusGain && !isValueChangeEvent(event.Type) &&
		event.Type != atspi.AccessibleNameEvent && !isManagedDescendantEvent(event.Type) {
		return "", false, false
	}
	text = presentation.ComboBoxSelectionText(event.Source)
	update = !focusGain || event.Source.ID() == history.focus
	duplicate = update && event.Source.ID() == history.focus && text == history.value
	history.value = text
	if focusGain {
		history.focus = event.Source.ID()
	}
	return text, update, duplicate
}