//send the message by click
$(".chat-send").click(sendMsg);

//press enter to send
$("form").keypress(function(event) {
if (event.keyCode === 13) {
event.preventDefault();
sendMsg();
}
});

//clear the chat box
$(".chat-clear").click(clearChatBox);
});

//send message to chat box
function sendMsg() {
var msg = $(".chat-message");
var msgVal = msg.val();
var chatBox = $(".chat-box");
if (msgVal) {
var msgAppend = "

You: " + msgVal + "

---

";
chatBox.append(msgAppend);
} else {}

//dialog reply
dialog(msgVal);

//empty input
msg.val("");

//keep the scroll in bottom
chatBox.scrollTop(chatBox[0].scrollHeight);
}

//set up the AI dialog
function dialog(msg){
var replyArr = ["Hi,how's it going :)","I'm good,thx,U? :)"];
msg = msg.toLowerCase();
var time = new Date();
var hour = time.getHours();
var minute = time.getMinutes();
var currentTime = plusZero(hour) + ":" + plusZero(minute);

var chatBox = $(".chat-box");

if(msg.indexOf("hello") != -1){
chatBox.append("

AI: " + replyArr[0] + "

---

");
}
else if(msg.indexOf("how are you") != -1 || msg.indexOf("how are u") != -1){
chatBox.append("

AI: " + replyArr[1] + "

---

");
}
else if(msg.indexOf("time") != -1){
chatBox.append("

AI: Current Time: " + currentTime + ". " + timeGreeting(hour) + "~ :)

---

");
}
else {}
}

//add 0 if time number is <10
function plusZero(x){
if(x < 10){
x = "0" + x;
}
else {
x = x;
}
return x;
}

//greeting by hour
function timeGreeting(h){
var greeting = ["U need to sleep","Good morning","Lunch time now","Feel asleep? Have some coffee","Free time~Yeah","Good night"];

if(h>=0&&h<=6){
return greeting[0];
}
else if(h>=7&&h<=10){
return greeting[1];
}
else if(h>=11&&h<=13){
return greeting[2];
}
else if(h>=14&&h<=18){
return greeting[3];
}
else if(h>=19&&h<=21){
return greeting[4];
}
else if(h>=22&&h<=23){
return greeting[5];
}
else {
return "";
}
}

//clear the chat box
function clearChatBox() {
$(".chat-box").html("");
}