// Cthulhu screen reader.
// Copyright (c) 2026 Storm Dragon
// Authors: Storm Dragon, Angus Kola
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.

// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.

// You should have received a copy of the GNU General Public License along with
// this program. If not, see <https://www.gnu.org/licenses/gpl-3.0.html>.

package app

import (
	"slices"
	"strings"
	"unicode/utf8"

	"git.stormux.org/storm/cthulhu/internal/config"
	"git.stormux.org/storm/cthulhu/internal/remote"
	"git.stormux.org/storm/cthulhu/internal/wine"
	"github.com/godbus/dbus/v5"
)

type remoteSpeech struct {
	speech  speechEnqueuer
	braille interface {
		EnqueueMessage(string) bool
	}
	wine            *wineEventPresenter
	wineReview      *wine.ReviewRegistry
	showPreferences func()
	quit            func()
	runtimeSnapshot func() string
	live            *liveSettings
	preferences     *preferencesWorker
}

func (presenter remoteSpeech) RegisterProvider(sender string, path dbus.ObjectPath, version uint32) bool {
	return presenter.wineReview != nil && presenter.wineReview.RegisterProvider(sender, path, version)
}
func (presenter remoteSpeech) PresentFocus(sender string, notice wine.ReviewFocusNotice) bool {
	return presenter.wineReview != nil && presenter.wineReview.PresentFocus(sender, notice)
}
func (presenter remoteSpeech) BindWineReviewConnection(connection *dbus.Conn) {
	if presenter.wineReview != nil {
		presenter.wineReview.BindWineReviewConnection(connection)
	}
}

func (presenter remoteSpeech) ShowPreferences() bool {
	if presenter.showPreferences == nil {
		return false
	}
	presenter.showPreferences()
	return true
}

func (presenter remoteSpeech) Quit() bool {
	if presenter.quit == nil {
		return false
	}
	presenter.quit()
	return true
}

func (presenter remoteSpeech) RuntimeStateSnapshot() string {
	if presenter.runtimeSnapshot == nil {
		return ""
	}
	return presenter.runtimeSnapshot()
}

func (presenter remoteSpeech) PresentAccessibleEvent(event remote.AccessibleEvent) bool {
	return presenter.wine != nil && presenter.wine.present_event(event, presenter.presentWineEditor)
}

func (presenter remoteSpeech) PresentMessage(message string) bool {
	return presenter.presentMessage(message, "remote-present-message")
}

func (presenter remoteSpeech) presentMessage(message, cause string) bool {
	return presenter.presentRequest(speechRequest{
		Text: message, Role: "system", Cause: cause, Append: true,
	})
}

func (presenter remoteSpeech) presentWineEditor(event remote.AccessibleEvent) bool {
	// These action kinds are part of the helper editor protocol. Keep
	// character identity for navigation and Backspace as well as typing.
	kinds := strings.Fields(event.States)
	inserted := slices.Contains(kinds, "kind=8")
	settings := config.DefaultSettings()
	if presenter.live != nil {
		settings = presenter.live.Load()
	}
	if inserted && !wineTypingEchoEnabled(event.Name, settings) {
		return false
	}
	character := inserted || utf8.RuneCountInString(event.Name) == 1
	custom := false
	if character && presenter.live != nil && (inserted || slices.Contains(kinds, "kind=7")) {
		custom = customEcho(settings, "character")
	}
	return presenter.presentRequest(speechRequest{
		Text: event.Name, Role: "system", Cause: "wine-accessible-event", Append: true,
		Character: character, CustomEcho: custom,
	})
}

func (presenter remoteSpeech) presentRequest(request speechRequest) bool {
	if request.Text == "" {
		return false
	}
	accepted := false
	if presenter.speech != nil {
		presenter.speech.Enqueue(request)
		accepted = true
	}
	if presenter.braille != nil && presenter.braille.EnqueueMessage(request.Text) {
		accepted = true
	}
	return accepted
}

func (presenter remoteSpeech) SpeakText(text string, interrupt bool) bool {
	if presenter.speech == nil || text == "" {
		return false
	}
	if interrupt {
		presenter.speech.Interrupt()
	}
	presenter.speech.Enqueue(speechRequest{
		Text:   text,
		Role:   "system",
		Cause:  "remote-speak-text",
		Append: true,
	})
	return true
}

func (presenter remoteSpeech) BrailleMessage(text string) bool {
	if presenter.braille == nil || text == "" {
		return false
	}
	return presenter.braille.EnqueueMessage(text)
}

func (presenter remoteSpeech) CancelSpeech() bool {
	if presenter.speech == nil {
		return false
	}
	presenter.speech.Interrupt()
	return true
}