var OPENAI_API_KEY = "";
var bTextToSpeechSupported = false;
var bSpeechInProgress = false;
var oSpeechRecognizer = null
var oSpeechSynthesisUtterance = null;
var oVoices = null;
function OnLoad() {
if ("webkitSpeechRecognition" in window) {
} else {
//speech to text not supported
lblSpeak.style.display = "none";
}
if ('speechSynthesis' in window) {
    bTextToSpeechSupported = true;

    speechSynthesis.onvoiceschanged = function () {
        oVoices = window.speechSynthesis.getVoices();
        for (var i = 0; i < oVoices.length; i++) {
            selVoices[selVoices.length] = new Option(oVoices[i].name, i);
        }
    };
}

}
function ChangeLang(o) {
if (oSpeechRecognizer) {
oSpeechRecognizer.lang = selLang.value;
//SpeechToText()
}
}
function Send() {
var sQuestion = txtMsg.value;
if (sQuestion == "") {
    alert("Type in your question!");
    txtMsg.focus();
    return;
}

spMsg.innerHTML = "Chat GPT is thinking...";

var sUrl = "https://api.openai.com/v1/completions";
var sModel = selModel.value;// "text-davinci-003";
if (sModel.indexOf("gpt-3.5-turbo") != -1) {
    //https://openai.com/research/gpt-4
    sUrl = "https://api.openai.com/v1/chat/completions";
}

var oHttp = new XMLHttpRequest();
oHttp.open("POST", sUrl);
oHttp.setRequestHeader("Accept", "application/json");
oHttp.setRequestHeader("Content-Type", "application/json");
oHttp.setRequestHeader("Authorization", "Bearer " + OPENAI_API_KEY)

oHttp.onreadystatechange = function () {
    if (oHttp.readyState === 4) {
        //console.log(oHttp.status);

        spMsg.innerHTML = "";

        var oJson = {}
        if (txtOutput.value != "") txtOutput.value += "\n";

        try {
            oJson = JSON.parse(oHttp.responseText);
        } catch (ex) {
            txtOutput.value += "Error: " + ex.message
        }

        if (oJson.error && oJson.error.message) {
            txtOutput.value += "Error: " + oJson.error.message;

        } else if (oJson.choices) {
            var s = "";

            if (oJson.choices[0].text) {
                s = oJson.choices[0].text;

            } else if (oJson.choices[0].message) {
                //GPT-4
                s = oJson.choices[0].message.content;
            }

            if (selLang.value != "en-US") {
                var a = s.split("?\n");
                if (a.length == 2) {
                    s = a[1];
                }
            }

            if (s == "") {
                s = "No response";
            } else {
                txtOutput.value += "Chat GPT: " + s;
                TextToSpeech(s);
            }
        }
    }
};

var iMaxTokens = 2048;
var sUserId = "1";
var dTemperature = 0.5;

var data = {
    model: sModel,
    prompt: sQuestion,
    max_tokens: iMaxTokens,
    user: sUserId,
    temperature: dTemperature,
    frequency_penalty: 0.0, //Number between -2.0 and 2.0  
                            //Positive value decrease the model's likelihood 
                            //to repeat the same line verbatim.
    presence_penalty: 0.0,  //Number between -2.0 and 2.0. 
                            //Positive values increase the model's likelihood 
                            //to talk about new topics.
    stop: ["#", ";"]        //Up to 4 sequences where the API will stop generating 
                            //further tokens. The returned text will not contain 
                            //the stop sequence.
}

//chat GPT-4 gpt-4
if (sModel.indexOf("gpt-3.5-turbo") != -1) {
    data = {
        "model": sModel,
        "messages": [
            //{
            //    "role": "system",
            //    "content": "You are a helpful assistant."  
            //                assistant messages help store prior responses
            //},
            {
                "role": "user", //system,user,assistant
                "content": sQuestion
            }
        ]
    }
}

oHttp.send(JSON.stringify(data));

if (txtOutput.value != "") txtOutput.value += "\n";
txtOutput.value += "Me: " + sQuestion;
txtMsg.value = "";

}
function TextToSpeech(s) {
if (bTextToSpeechSupported == false) return;
if (chkMute.checked) return;
oSpeechSynthesisUtterance = new SpeechSynthesisUtterance();

if (oVoices) {
    var sVoice = selVoices.value;
    if (sVoice != "") {
        oSpeechSynthesisUtterance.voice = oVoices[parseInt(sVoice)];
    }        
}    

oSpeechSynthesisUtterance.onend = function () {
    //finished talking - can now listen
    if (oSpeechRecognizer && chkSpeak.checked) {
        oSpeechRecognizer.start();
    }
}

if (oSpeechRecognizer && chkSpeak.checked) {
    //do not listen to yourself when talking
    oSpeechRecognizer.stop();
}

oSpeechSynthesisUtterance.lang = selLang.value;
oSpeechSynthesisUtterance.text = s;
//Uncaught (in promise) Error: A listener indicated an asynchronous response 
//by returning true, but the message channel closed 
window.speechSynthesis.speak(oSpeechSynthesisUtterance);

}
function Mute(b) {
if (b) {
selVoices.style.display = "none";
} else {
selVoices.style.display = "";
}
}
function SpeechToText() {
if (oSpeechRecognizer) {

    if (chkSpeak.checked) {
        oSpeechRecognizer.start();
    } else {
        oSpeechRecognizer.stop();
    }

    return;
}    

oSpeechRecognizer = new webkitSpeechRecognition();
oSpeechRecognizer.continuous = true;
oSpeechRecognizer.interimResults = true;
oSpeechRecognizer.lang = selLang.value;
oSpeechRecognizer.start();

oSpeechRecognizer.onresult = function (event) {
    var interimTranscripts = "";
    for (var i = event.resultIndex; i < event.results.length; i++) {
        var transcript = event.results[i][0].transcript;

        if (event.results[i].isFinal) {
            txtMsg.value = transcript;
            Send();
        } else {
            transcript.replace("\n", "<br>");
            interimTranscripts += transcript;
        }

        var oDiv = document.getElementById("idText");
        oDiv.innerHTML = '<span style="color: #999;">' + 
                           interimTranscripts + '</span>';
    }
};

oSpeechRecognizer.onerror = function (event) {

};

}