#include <QSettings>
#include <QDebug>
#include <QCoreApplication>
#include <QFile>
#include <QRegularExpression>

#include "QGC.h"
#include "QGCAudioWorker.h"
#include "GAudioOutput.h"

#if defined Q_OS_MAC && defined QGC_SPEECH_ENABLED
#include <ApplicationServices/ApplicationServices.h>
#endif

// Speech synthesis is only supported with MSVC compiler
#if defined _MSC_VER && defined QGC_SPEECH_ENABLED
// Documentation: http://msdn.microsoft.com/en-us/library/ee125082%28v=VS.85%29.aspx
#include <sapi.h>
#endif

#if defined Q_OS_LINUX && defined QGC_SPEECH_ENABLED
// Using eSpeak for speech synthesis: following https://github.com/mondhs/espeak-sample/blob/master/sampleSpeak.cpp
#include <espeak/speak_lib.h>
#endif

#define QGC_GAUDIOOUTPUT_KEY QString("QGC_AUDIOOUTPUT_")

QGCAudioWorker::QGCAudioWorker(QObject *parent) :
    QObject(parent),
    voiceIndex(0),
    #if defined _MSC_VER && defined QGC_SPEECH_ENABLED
    pVoice(NULL),
    #endif
    #ifdef QGC_NOTIFY_TUNES_ENABLED
    sound(NULL),
    #endif
    emergency(false),
    muted(false)
{
    // Load settings
    QSettings settings;
    muted = settings.value(QGC_GAUDIOOUTPUT_KEY + "muted", muted).toBool();
}

void QGCAudioWorker::init()
{
#ifdef QGC_NOTIFY_TUNES_ENABLED
    sound = new QSound(":/res/Alert");
#endif

#if defined Q_OS_LINUX && defined QGC_SPEECH_ENABLED
    espeak_Initialize(AUDIO_OUTPUT_SYNCH_PLAYBACK, 500, NULL, 0); // initialize for playback with 500ms buffer and no options (see speak_lib.h)
    espeak_VOICE *espeak_voice = espeak_GetCurrentVoice();
    espeak_voice->languages = "en-uk"; // Default to British English
    espeak_voice->identifier = NULL; // no specific voice file specified
    espeak_voice->name = "klatt"; // espeak voice name
    espeak_voice->gender = 2; // Female
    espeak_voice->age = 0; // age not specified
    espeak_SetVoiceByProperties(espeak_voice);
#endif

#if defined _MSC_VER && defined QGC_SPEECH_ENABLED

    if (FAILED(::CoInitialize(NULL)))
    {
        qDebug() << "ERROR: Creating COM object for audio output failed!";
    }
    else
    {

        HRESULT hr = CoCreateInstance(CLSID_SpVoice, NULL, CLSCTX_ALL, IID_ISpVoice, (void **)&pVoice);

        if (FAILED(hr))
        {
            qDebug() << "ERROR: Initializing voice for audio output failed!";
        }
    }

#endif
}

QGCAudioWorker::~QGCAudioWorker()
{
#if defined _MSC_VER && defined QGC_SPEECH_ENABLED
	if (pVoice) {
		pVoice->Release();
		pVoice = NULL;
	}
    ::CoUninitialize();
#endif
}

void QGCAudioWorker::say(QString inText, int severity)
{
	static bool threadInit = false;
	if (!threadInit) {
		threadInit = true;
		init();
	}

    if (!muted)
    {
        QString text = _fixTextMessageForAudio(inText);
        // Prepend high priority text with alert beep
        if (severity < GAudioOutput::AUDIO_SEVERITY_CRITICAL) {
            beep();
        }

#ifdef QGC_NOTIFY_TUNES_ENABLED
        // Wait for the last sound to finish
        while (!sound->isFinished()) {
            QGC::SLEEP::msleep(100);
        }
#endif

#if defined _MSC_VER && defined QGC_SPEECH_ENABLED
        HRESULT hr = pVoice->Speak(text.toStdWString().c_str(), SPF_DEFAULT, NULL);
		if (FAILED(hr)) {
			qDebug() << "Speak failed, HR:" << QString("%1").arg(hr, 0, 16);
		}
#elif defined Q_OS_LINUX && defined QGC_SPEECH_ENABLED
        // Set size of string for espeak: +1 for the null-character
        unsigned int espeak_size = strlen(text.toStdString().c_str()) + 1;
        espeak_Synth(text.toStdString().c_str(), espeak_size, 0, POS_CHARACTER, 0, espeakCHARS_AUTO, NULL, NULL);

#elif defined Q_OS_MAC && defined QGC_SPEECH_ENABLED
        // Slashes necessary to have the right start to the sentence
        // copying data prevents SpeakString from reading additional chars
        text = "\\" + text;
        std::wstring str = text.toStdWString();
        unsigned char str2[1024] = {};
        memcpy(str2, text.toLatin1().data(), str.length());
        SpeakString(str2);

        // Block the thread while busy
        // because we run in our own thread, this doesn't
        // halt the main application
        while (SpeechBusy()) {
            QGC::SLEEP::msleep(100);
        }

#else
        // Make sure there isn't an unused variable warning when speech output is disabled
        Q_UNUSED(inText);
#endif
    }
}

void QGCAudioWorker::mute(bool mute)
{
    if (mute != muted)
    {
        this->muted = mute;
        QSettings settings;
        settings.setValue(QGC_GAUDIOOUTPUT_KEY + "muted", this->muted);
//        emit mutedChanged(muted);
    }
}

void QGCAudioWorker::beep()
{

    if (!muted)
    {
#ifdef QGC_NOTIFY_TUNES_ENABLED
        sound->play(":/res/Alert");
#endif
    }
}

bool QGCAudioWorker::isMuted()
{
    return this->muted;
}

bool QGCAudioWorker::_getMillisecondString(const QString& string, QString& match, int& number) {
    static QRegularExpression re("([0-9]+ms)");
    QRegularExpressionMatchIterator i = re.globalMatch(string);
    while (i.hasNext()) {
        QRegularExpressionMatch qmatch = i.next();
        if (qmatch.hasMatch()) {
            match = qmatch.captured(0);
            number = qmatch.captured(0).replace("ms", "").toInt();
            return true;
        }
    }
    return false;
}

QString QGCAudioWorker::_fixTextMessageForAudio(const QString& string) {
    QString match;
    QString newNumber;
    QString result = string;
    //-- Look for modes
    if(result.contains("POSCTL", Qt::CaseInsensitive)) {
        result.replace("POSCTL", "Position Control", Qt::CaseInsensitive);
    } else if(result.contains("ALTCTL", Qt::CaseInsensitive)) {
        result.replace("ALTCTL", "Altitude Control", Qt::CaseInsensitive);
    } else if(result.contains("RTL", Qt::CaseInsensitive)) {
        result.replace("RTL", "Return To Land", Qt::CaseInsensitive);
    }
    int number;
    if(_getMillisecondString(string, match, number) && number > 1000) {
        if(number < 60000) {
            int seconds = number / 1000;
            newNumber = QString("%1 second%2").arg(seconds).arg(seconds > 1 ? "s" : "");
        } else {
            int minutes = number / 60000;
            int seconds = (number - (minutes * 60000)) / 1000;
            if (!seconds) {
                newNumber = QString("%1 minute%2").arg(minutes).arg(minutes > 1 ? "s" : "");
            } else {
                newNumber = QString("%1 minute%2 and %3 second%4").arg(minutes).arg(minutes > 1 ? "s" : "").arg(seconds).arg(seconds > 1 ? "s" : "");
            }
        }
        result.replace(match, newNumber);
    }
    return result;
}