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

package atspi

/*
#include "adapter_native.h"
*/
import "C"

// addedSelectedBrowserTab handles providers which emit selection before the new
// tab enters their accessible child list. The later child-added event supplies
// the actual target; only a freshly selected browser chrome tab qualifies.
// The caller releases the retained target on the GLib owner.
func addedSelectedBrowserTab(event *C.AtspiEvent, eventType string) *C.AtspiAccessible {
	if eventType != ChildrenAddedEvent || C.atspi_accessible_get_role(event.source, nil) != C.ATSPI_ROLE_PAGE_TAB_LIST {
		return nil
	}
	child := C.cthulhu_event_active_descendant(event)
	if child == nil || C.atspi_accessible_get_role(child, nil) != C.ATSPI_ROLE_PAGE_TAB {
		return nil
	}
	parent := C.atspi_accessible_get_parent(child, nil)
	if parent == nil {
		return nil
	}
	matchesParent := nativeObjectID(parent) == nativeObjectID(event.source)
	C.g_object_unref(C.gpointer(parent))
	if !matchesParent {
		return nil
	}
	C.atspi_accessible_clear_cache_single(child)
	states := C.atspi_accessible_get_state_set(child)
	if states == nil {
		return nil
	}
	selected := C.atspi_state_set_contains(states, C.ATSPI_STATE_SELECTED) != 0 &&
		C.atspi_state_set_contains(states, C.ATSPI_STATE_DEFUNCT) == 0
	C.g_object_unref(C.gpointer(states))
	if !selected {
		return nil
	}
	toolkit := C.atspi_accessible_get_toolkit_name(child, nil)
	snapshot := Snapshot{Role: "page tab", ToolkitName: C.GoString(toolkit)}
	C.g_free(C.gpointer(toolkit))
	document := C.cthulhu_document_ancestor(child)
	if document != nil {
		C.g_object_unref(C.gpointer(document))
		return nil
	}
	if !isBrowserChromeTab(snapshot, false) {
		return nil
	}
	C.g_object_ref(C.gpointer(child))
	return child
}

// resolveNativeEventTarget runs on the GLib owner. The override target is
// borrowed from the callback; LibreOffice and selected descendants can return
// owned references. The caller releases an owned target after event capture.
func (adapter *Adapter) resolveNativeEventTarget(event *C.AtspiEvent, eventType string, overrideTarget *C.AtspiAccessible) (*C.AtspiAccessible, bool) {
	target := overrideTarget
	ownedTarget := false
	if target == nil {
		target = adapter.libreOfficeFocusTarget(event, eventType)
		ownedTarget = target != nil
	}
	if target == nil {
		target, ownedTarget = selectNativeEventTarget(event, eventType)
	}
	return target, ownedTarget
}

// Refresh only the established provider caches, in query order, before capture.
// Both accessibles are borrowed and stay on the GLib owner thread.
func refreshNativeEventTarget(event *C.AtspiEvent, target *C.AtspiAccessible, eventType string) {
	if (eventType == FocusEvent || eventType == FocusedStateEvent) &&
		C.atspi_accessible_get_role(target, nil) == C.ATSPI_ROLE_MENU_ITEM {
		// Qt menus can change their checked state without a state-change
		// event. Reopening the menu must capture the current provider state.
		C.atspi_accessible_clear_cache_single(target)
	}
	if (eventType == SelectedStateEvent || eventType == SelectionChangedEvent) &&
		C.atspi_accessible_get_role(target, nil) == C.ATSPI_ROLE_PAGE_TAB {
		// Firefox can emit selected-state events from the previous tab;
		// query the current state/name before using either event path.
		C.atspi_accessible_clear_cache_single(target)
	}
	if eventType == WindowDeactivatedEvent {
		// Match Python's key-grab churn check against fresh window state rather
		// than an AT-SPI cache entry from before the deactivation event.
		C.atspi_accessible_clear_cache_single(event.source)
	}
}

// captureNativeEventContent borrows event/target and owns all payload buffers.
// A completed atomic live region replaces the event payload before copying it.
// No native references escape this helper; all calls remain on the GLib owner.
func (adapter *Adapter) captureNativeEventContent(event *C.AtspiEvent, target *C.AtspiAccessible, eventType string, originID ObjectID, live nativeLiveProperties, completeLive bool) (Snapshot, ObjectID, string) {
	payload := C.cthulhu_event_payload(event)
	defer func() { C.g_free(C.gpointer(payload)) }()
	snapshot, popupFor := adapter.captureNativeEventSnapshot(event, target, eventType, originID, live)
	if completeLive {
		text := C.cthulhu_live_content(event.source)
		snapshot.Text = sanitizeSnapshotField(C.GoString(text))
		snapshot.LiveAtomic = true
		C.g_free(C.gpointer(payload))
		payload = text
	}
	return snapshot, popupFor, C.GoString(payload)
}

// normalizeNativeMenuFocus applies provider evidence to this event's snapshot.
// It borrows target and releases the temporary inline-menu reference locally.
func normalizeNativeMenuFocus(event *C.AtspiEvent, target *C.AtspiAccessible, eventType string, originID ObjectID, snapshot *Snapshot) (string, ObjectID) {
	// Shared Qt actions can report focus through their original, hidden menu
	// even while another menu emits focus-gained for that very accessible.
	// The explicit event establishes focus; the queried state may disagree.
	// Do not transfer this evidence to a redirected descendant or a dead item.
	if snapshot.ID() == originID && !snapshot.Defunct &&
		(eventType == FocusEvent || eventType == FocusedStateEvent && C.cthulhu_event_detail1(event) == 1) {
		switch snapshot.Role {
		case "menu item", "check menu item", "radio menu item":
			snapshot.Focused = true
		}
	}
	var inlineMenuID ObjectID
	if eventType == SelectedStateEvent && C.cthulhu_event_detail1(event) == 1 && !snapshot.Defunct &&
		(snapshot.Role == "button" || snapshot.Role == "push button" || snapshot.Role == "toggle button" ||
			snapshot.Role == "menu item" || snapshot.Role == "check menu item" || snapshot.Role == "radio menu item") {
		if menu := C.cthulhu_inline_menu_container(target); menu != nil {
			inlineMenuID = nativeObjectID(menu)
			C.g_object_unref(C.gpointer(menu))
			if inlineMenuID.Valid() && inlineMenuID.BusName == snapshot.BusName {
				// The event's detail is authoritative even when libatspi still
				// caches the previous SELECTED state on the first visit.
				eventType, snapshot.Selected = ActiveDescendantEvent, true
			}
		}
	}
	return eventType, inlineMenuID
}