/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 <http://www.gnu.org/licenses/>.
 *
 */


#include "common/text-to-speech.h"
#include "common/system.h"
namespace Common {

TTSVoice::TTSVoice()
	: _gender(UNKNOWN_GENDER)
	, _age(UNKNOWN_AGE)
	, _data(nullptr)
	, _description("") {
	_refCount = new int;
	*_refCount = 1;
}

TTSVoice::TTSVoice(Gender gender, Age age, void *data, String description)
	: _gender(gender)
	, _age(age)
	, _data(data)
	, _description(description) {
	_refCount = new int;
	*_refCount = 1;
}

TTSVoice::TTSVoice(const TTSVoice& voice)
	: _gender(voice._gender)
	, _age(voice._age)
	, _data(voice._data)
	, _refCount(voice._refCount)
	, _description(voice._description) {
	if (_data)
		(*_refCount)++;
}

TTSVoice::~TTSVoice() {
	// _data is a platform specific field and so it the
	// way it is freed differs from platform to platform
	if (--(*_refCount) == 0) {
		if (_data)
			g_system->getTextToSpeechManager()->freeVoiceData(_data);
		delete _refCount;
	}
}

TTSVoice& TTSVoice::operator=(const TTSVoice& voice) {
	if (&voice != this) {
		_gender = voice._gender;
		_data = voice._data;
		_age = voice._age;
		_refCount = voice._refCount;
		if (_data)
			(*_refCount)++;
		_description = voice._description;
	}
	return *this;
}

TextToSpeechManager::TextToSpeechManager() {
	_ttsState = new TTSState;
	_ttsState->_pitch = 0;
	_ttsState->_volume = 0;
	_ttsState->_rate = 0;
	_ttsState->_activeVoice = 0;
	_ttsState->_language = "en";
	_ttsState->_enabled = false;
	_ttsState->_next = nullptr;
}

void TextToSpeechManager::pushState() {
	stop();
	TTSState *newState = new TTSState;
	newState->_pitch = _ttsState->_pitch;
	newState->_volume = _ttsState->_volume;
	newState->_rate = _ttsState->_rate;
	newState->_activeVoice = _ttsState->_activeVoice;
	newState->_language = _ttsState->_language;
	newState->_enabled = _ttsState->_enabled;
	newState->_next = _ttsState;
	_ttsState = newState;
	updateVoices();
}

bool TextToSpeechManager::popState() {
	stop();
	if (_ttsState->_next == nullptr)
		return true;

	Common::TTSState *oldState = _ttsState;
	_ttsState = _ttsState->_next;

	delete oldState;

	// The voice has to be saved, because some backends change it when changing language
	int voice = _ttsState->_activeVoice;
	setLanguage(_ttsState->_language);
	setPitch(_ttsState->_pitch);
	setVolume(_ttsState->_volume);
	setRate(_ttsState->_rate);
	setVoice(voice);

	return false;
}

void TextToSpeechManager::enable(bool on) {
	if (_ttsState->_enabled == on)
		return;
	_ttsState->_enabled = on;
	updateVoices();
}

void TextToSpeechManager::clearState() {
	TTSState *tmp = _ttsState;
	while (tmp != nullptr) {
		tmp = _ttsState->_next;
		delete _ttsState;
		_ttsState = tmp;
	}
}

TTSVoice TextToSpeechManager::getVoice() {
	if (!_ttsState->_availableVoices.empty())
		return _ttsState->_availableVoices[_ttsState->_activeVoice];
	return TTSVoice();
}

Array<int> TextToSpeechManager::getVoiceIndicesByGender(TTSVoice::Gender gender) {
	Array<int> results;
	for (unsigned i = 0; i < _ttsState->_availableVoices.size(); i++) {
		if (_ttsState->_availableVoices[i].getGender() == gender)
			results.push_back(i);
	}
	return results;
}

void TextToSpeechManager::setLanguage(Common::String language) {
	// The speech manager uses the ISO 639-1 for language codes (2 letter code)
	// if we get a longer language string, just take the first 2 letters from that
	// if it won't be a valid language code, the Manager just won't find any voice
	// for it. This way a code like (en_GB) can also be passed to this.
	if (language.size() > 2) {
		language.erase(2, Common::String::npos);
	}
	_ttsState->_language = language;
}

}
