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

package app

import (
	"strings"

	"git.stormux.org/storm/cthulhu/internal/atspi"
	"git.stormux.org/storm/cthulhu/internal/braille"
	"git.stormux.org/storm/cthulhu/internal/platform/xorg"
	"git.stormux.org/storm/cthulhu/internal/webscripts"
)

// acceptFocusOwnership keeps native window focus, XTerm handoff, and navigation
// echoes ahead of input intent and normal presentation.
func (handler *accessibilityEventHandler) acceptFocusOwnership(event atspi.Event, notification bool) bool {
	state := handler.state
	logger := handler.logger
	speech := handler.speech
	focusGate := handler.focusGate
	objectReview := handler.objectReview
	brailleOutput := handler.brailleOutput
	ownedAutocompletePopup := state.ownedAutocompletePopup
	if isFocusGainEvent(event) {
		if event.Type == atspi.WindowActivatedEvent {
			focusBeforeActivation := state.owner.window.Valid() && state.owner.window == eventWindow(event) &&
				state.owner.focus.Valid() && !state.owner.activated
			// Window ownership and object focus are independent. Providers can
			// repeat activation for the same top-level around an X11 key grab,
			// and the activation snapshot can be the frame while the focused
			// object is one of its descendants. Treating that source mismatch as
			// a new activation interrupts review speech and resets its cursor.
			if state.owner.activate(event) {
				logger.Debug("skipped duplicate accessible window activation", "application", event.Source.ApplicationName, "bus", state.owner.window.BusName, "window_path", state.owner.window.Path, "focus_path", event.Source.Path)
				return true
			}
			state.lastFileManagerStatus, state.lastFileManagerStatusWindow = "", atspi.ObjectID{}
			logger.Debug("activated accessible window", "application", event.Source.ApplicationName, "bus", state.owner.window.BusName, "window_path", state.owner.window.Path, "focus_path", event.Source.Path)
			if (event.Source.Role == "alert" || event.Source.Role == "frame") &&
				state.pendingPromptTextAnnounced && state.pendingPromptWindow.Valid() && event.Window == state.pendingPromptWindow {
				// The prompt's window:create already queued its title and
				// message. Activation must not cut that announcement short.
				return true
			}
			if focusBeforeActivation {
				text := strings.TrimSpace(event.WindowTitle)
				if (event.Source.Role == "button" || event.Source.Role == "tree table" || event.Source.Role == "table cell") && event.WindowMessage != "" {
					if text != "" {
						text += ", "
					}
					text += event.WindowMessage
				}
				if text != "" {
					speech.Interrupt()
					speech.Enqueue(speechRequest{Text: text, Role: "frame", Cause: event.Type,
						Window: eventWindow(event), IntroducesWindow: true,
						ExcludeFromHistory: state.historyWindow.Valid() && eventWindow(event) == state.historyWindow})
				}
				return true
			}
		} else if !ownedAutocompletePopup(event) && !state.owner.follow(event) {
			logger.Debug("skipped focus outside active window", "type", event.Type, "application", event.Source.ApplicationName, "bus", event.Window.BusName, "window_path", event.Window.Path, "focus_path", event.Source.Path)
			return true
		}
		if isXTermFocus(event) {
			state.brailleSnapshot = atspi.Snapshot{}
			if brailleOutput != nil {
				brailleOutput.EnqueueFrame(braille.Frame{Cursor: -1})
			}
			state.pending.clear()
			focusGate.SetSuspended(true)
			state.focusedID = event.Source.ID()
			state.current = event.Source
			if objectReview != nil {
				objectReview.SyncFocus(event.Source.ID())
			}
			logger.Info("suspended for XTerm focus handoff")
			return true
		}
		if !notification {
			focusGate.SetSuspended(false)
		}
	}
	if focusGate.Suspended() && !notification {
		logger.Debug("skipped event during XTerm focus handoff", "type", event.Type, "role", event.Source.Role)
		return true
	}
	if event.NavigationEcho {
		return true
	}
	// The native adapter already filters focused-state losses. Keep the
	// event loop defensive for alternate adapters and tests: Python does
	// not present or follow the object which just lost focus.
	if event.Type == atspi.FocusedStateEvent && event.Detail1 == 0 {
		return true
	}
	return false
}

func isXTermSnapshot(snapshot atspi.Snapshot) bool {
	return strings.EqualFold(snapshot.ApplicationName, "xterm")
}

func isXTermFocus(event atspi.Event) bool {
	if isXTermSnapshot(event.Source) {
		return true
	}
	return event.Source.Role == "terminal" && event.Source.ApplicationName == "" && xorg.ActiveWindowIsXTerm()
}

func eventBypassesXTermHandoff(event atspi.Event) bool {
	if webscripts.HandlesNotification(event.Source.ApplicationProcess, event.Type, event.Detail1, event.WebNotification) {
		return true
	}
	role := strings.ToLower(event.Source.Role)
	if role == "notification" || role == "alert" {
		return true
	}
	switch event.Type {
	case "window:create", "object:property-change:accessible-name", atspi.AccessibleValueEvent:
		switch strings.ToLower(event.Source.ApplicationName) {
		case "notification-daemon", "notify-osd", "xfce4-notifyd", "mate-notification-daemon":
			return true
		}
	}
	return false
}