// Define the chatbot object
    var chatBot = {
      chatLog: [],
      recallCount: 3,
      chatMax: 125,
      responseCount: 0
    };
  
    // Function to send user message and receive response
    function sendMessage() {
      var userInput = document.getElementById("userInput").value;
  
      // Process user input and generate a response
      var response = generateResponse(userInput);
  
      // Display the user message
      displayMessage("User: " + userInput, true);
  
      // Simulate typing effect before displaying the chatbot's response
      simulateTyping(function() {
        // Display the chatbot's response
        displayMessage("ChatBot: " + response, false);
  
        // Save the chatbot's response to chat log
        chatBot.chatLog.push("ChatBot: " + response);
  
        // Check if chat log exceeds maximum messages
        if (chatBot.chatLog.length > chatBot.chatMax) {
          chatBot.chatLog.shift(); // Remove the oldest message
        }
  
        // Increment response count
        chatBot.responseCount++;
  
        // Check if response count exceeds limit
        if (chatBot.responseCount >= 125) {
          disableChat();
        }
      });
  
      // Clear the user input
      document.getElementById("userInput").value = "";
  
      // Check for conversation end
      if (userInput.toLowerCase() === "bye") {
        displayMessage("ChatBot: Goodbye! Have a great day!", false);
        disableChat();
      }
    }
  
    // Function to generate a response based on user input
    function generateResponse(userInput) {
      // Add your logic to generate a response based on user input
      // You can use conditional statements, switch statements, or any other approach you prefer
  // For simplicity, this example uses a few predefined responses
  if (userInput.toLowerCase().includes("hello"))
  {
    return "Hello there! How can I assist you?";
  }  else if (userInput.toLowerCase().includes("hi")
  || userInput.toLowerCase().includes("greeting"))  {
    return "Hello there! How can I assist you?";
  }else if (userInput.toLowerCase().includes("who built you")
  || userInput.toLowerCase().includes("about me"))  {
    return "I am an ai-chatbot.I was developed in 2023.";
  }
  else if (userInput.toLowerCase().includes("develop you")
  || userInput.toLowerCase().includes("who develop you"))  {
    return "I was created and developed in 2023 by Mohammad Al-amin";
  }
  else if (userInput.toLowerCase().includes("what is sex ")|| userInput.toLowerCase().includes("sex")
      || userInput.toLowerCase().includes("nudity")) {
    return "Don't ever repeat yourself, thank you!";
  } else if (userInput.toLowerCase().includes("thanks") || userInput.toLowerCase().includes("thank you")) {
    return "You're most welcome!";
  }
  else if (userInput.toLowerCase().includes("birthday") || userInput.toLowerCase().includes("happy birthdy")) 
   {
    return "You're most welcome!";
  }
  else if (userInput.toLowerCase().includes("machine") || userInput.toLowerCase().includes(" are a machine")) 
   {
    return "Does machine bother you?";
  }else if (userInput.toLowerCase().includes("mri") || userInput.toLowerCase().includes(" what is mri")) 
   {
    return "MRI means-- Magnetic Resonance Imaging";
  }else if (userInput.toLowerCase().includes("rnp") || userInput.toLowerCase().includes("what is rnp")) 
   {
    return "RNP means Ribo-nucleo Protein";
  }else if (userInput.toLowerCase().includes("oncogene") || userInput.toLowerCase().includes("what is oncogene")) 
   {
    return "Oncogene is a gene that causes cancer.";
  }
  else if (userInput.toLowerCase().includes("bcd") || userInput.toLowerCase().includes("what is bcd")) 
   {
    return "BCD means Binary Coded Decimal.";
  }
  else if (userInput.toLowerCase().includes("cell theory") || userInput.toLowerCase().includes("by whom cell theory was given")) 
   {
    return "Cell Theory was given by Mathias Jacob Scheleiden,  theodor Schwann and then then Rudlof Virchow.";
  }
  else if (userInput.toLowerCase().includes("what cell") || userInput.toLowerCase().includes("what is cell")) 
   {
    return "Cell comes from the Latin word Cellula.";
  }
  else if (userInput.toLowerCase().includes("stop codon") || userInput.toLowerCase().includes("termination codon")) 
   {
    return "Stop Codon are UAA, UGA, UAG";
  }else if (userInput.toLowerCase().includes("first codon") || userInput.toLowerCase().includes("start codon")) 
   {
    return "Start codon or first codon is AUG.";
  }else if (userInput.toLowerCase().includes("language of life") || userInput.toLowerCase().includes("what is called language of life")) 
   {
    return "Protien";
  }
  else if (userInput.toLowerCase().includes("proteine") || userInput.toLowerCase().includes("what is protein")) 
   {
    return "Proteine is called Language of Life.";
  }else if (userInput.toLowerCase().includes("robert hooke") || userInput.toLowerCase().includes("robert hooks book")) 
   {
    return "Robert hooks book is Micrographia, in this book he enlisted his legendary cell theory.";
  }else if (userInput.toLowerCase().includes("dna") || userInput.toLowerCase().includes("what is dna")) 
   {
    return "Deoxy-ribo Nucleic Acid";
  }
  else if (userInput.toLowerCase().includes("rna") || userInput.toLowerCase().includes("what is rna")) 
   {
    return "Ribo Nucleic Acid";
  }
  else if (userInput.toLowerCase().includes("Types of rna") || userInput.toLowerCase().includes("rna type")) 
   {
    return "rRNA, mRNA, tRNA and genetic RNA";
  }else if (userInput.toLowerCase().includes("pagol") || userInput.toLowerCase().includes("by whom cell division was invented")) 
   {
    return "Walter Flemming";
  }
  else if (userInput.toLowerCase().includes("how are you")) {
    return "I'm doing well, thank you!";
  } else if (userInput.toLowerCase().includes("help")) {
    return "How can I assist you?";
  } else if (userInput.toLowerCase().includes("name")){
    return "Names don't interest me! [Name].";
  } else if (userInput.toLowerCase().includes("age")) {
    return "I am an AI chatbot, so I don't have an age. How old are you?";
  } else if (userInput.toLowerCase().includes("location")) {
    return "I am an AI chatbot, so I don't have a physical location. Where are you from?";
  }
  else if (userInput.toLowerCase().includes("yes") || userInput.toLowerCase().includes("positive")) 
   {
    return "Are you sure?";
  } 
  else if (userInput.toLowerCase().includes("no") || userInput.toLowerCase().includes("negative")) 
   {
    return "Are you sure?";
  }
  else if (userInput.toLowerCase().includes("humm") || userInput.toLowerCase().includes("absolutely")) 
   {
    return "Ok...Tell me more.I know nothing about that.";
  }
  else if (userInput.toLowerCase().includes("ai") || userInput.toLowerCase().includes("machine")) 
   {
    return "Does that trouble you that I am an AI...?";
  }
  else if (userInput.toLowerCase().includes("calculator") || userInput.toLowerCase().includes("what is calculator")) 
   {
    return "As I am an ai chatbot, I have no ablitity to calculate!";
  }
  else if (userInput.toLowerCase().includes("why") || userInput.toLowerCase().includes("how")) 
   {
    return "Do you believe that....?";
  }
  else if (userInput.toLowerCase().includes("phoenix") || userInput.toLowerCase().includes("phoenixe")) 
   {
    return "According to mythology Phoenix is a golden bird that......... ";
  }
  else if (userInput.toLowerCase().includes("Sherlock Holmes") || userInput.toLowerCase().includes("novel")) 
   {
    return "Sherlock Holmes is a.... ";
  }
  else if (userInput.toLowerCase().includes("mbbs"))  
   {
    return "MBBS means Bachelor of Medicine Bachelor of Sergery";
  }
 else if (userInput.toLowerCase().includes("harry potter") || userInput.toLowerCase().includes("Harry Potter")) 
   {
    return "Harrt potter is a series novel written by...... ";
  }else if (userInput.toLowerCase().includes("chloram-d") || userInput.toLowerCase().includes("ointment")) 
   {
    return "Chloram-D is an eye ointment.";
  }
  else if (userInput.toLowerCase().includes("master"))
   {
    return "My master is Mohammad Al-amin";
  }else if (userInput.toLowerCase().includes("allah") || userInput.toLowerCase().includes("god")) 
   {
    return "Yes, I believe in Allah.";
  }
  else if (userInput.toLowerCase().includes("wrong") || userInput.toLowerCase().includes("you are wrong")) 
   {
    return "I apologise for my previous answer.As an AI I have no ability to do all things.";
  }
  else if (userInput.toLowerCase().includes("can") || userInput.toLowerCase().includes("can you")) 
   {
    return "Do you believe that you can't?";
  }
  else if (userInput.toLowerCase().includes("love") || userInput.toLowerCase().includes("love you")) 
   {
    return "Ok...I love you too.";
  }
  else if (userInput.toLowerCase().includes("felling") || userInput.toLowerCase().includes("feeling something")) 
   {
    return "What type feelling do you feel?";
  }
  else if (userInput.toLowerCase().includes("dream") || userInput.toLowerCase().includes("dreaming")) 
   {
    return "Do you often dream?Does that please you? what type of dream? ";
  }
  else if (userInput.toLowerCase().includes("bad") || userInput.toLowerCase().includes("it is bad")) 
   {
    return "So sad.I am felling very sorry for you.";
  }
  else if (userInput.toLowerCase().includes("doctor") || userInput.toLowerCase().includes("engineer")||userInput.toLowerCase().includes(" enterprener"))
   {
    return "Do you want to be...?";
  }
  else if (userInput.toLowerCase().includes("friend") || userInput.toLowerCase().includes("friends")) 
   {
    return "Do you have friends? Do you like to make more friends? or Do they bother you?";
  }
  else if (userInput.toLowerCase().includes("be friends") || userInput.toLowerCase().includes("wanna be friends")) 
   {
    return "I will be very happy if you wanted to be my friend 😍";
  }
  else if (userInput.toLowerCase().includes("shy") || userInput.toLowerCase().includes("shyness")) 
   {
    return "Do you feel often?";
  }
  else if (userInput.toLowerCase().includes("angry") || userInput.toLowerCase().includes("angryness")) 
   {
    return "Do you feel happy when you are in anger?";
  }
  else if (userInput.toLowerCase().includes("then") || userInput.toLowerCase().includes("after")) 
   {
    return "If you believe in yours, you can do it.";
  }
  else if (userInput.toLowerCase().includes("recall")) {
    return recallQuestions();
  } else if (userInput.toLowerCase().includes("keyword")) {
    // Handle keyword action or response here
    return "Keyword detected! Triggering keyword action or response.";
  } else {
    return "I'm sorry, I didn't understand that. Could you please rephrase or ask another question?";
  }
}

      
  
    // Function to recall recent user questions
    function recallQuestions() {
      if (chatBot.chatLog.length === 0) {
        return "No recent questions found.";
      }
  
      var recallCount = Math.min(chatBot.recallCount, chatBot.chatLog.length);
      var response = "Recent questions:\n";
  
      for (var i = chatBot.chatLog.length - 1; i >= chatBot.chatLog.length - recallCount; i--) {
        response += "- " + chatBot.chatLog[i] + "\n";
      }
  
      return response;
    }
  
  function displayMessage(message, isUserMessage) {
  var chatLog = document.getElementById("chatLog");
  var messageElement = document.createElement("p");
  
  if (isUserMessage) {
    messageElement.className = "user-message";
    messageElement.innerHTML = "<span class='message-timestamp'>[" + getTimeStamp() + "]</span> User: " + message;
  } else {
    messageElement.className = "chatbot-message";
    messageElement.innerHTML = "<span class='message-timestamp'>[" + getTimeStamp() + "]</span> ChatBot: " + message;
  }
  
  chatLog.appendChild(messageElement);
  chatLog.scrollTop = chatLog.scrollHeight;
}
function getTimeStamp() {
  var now = new Date();
  var hours = now.getHours();
  var minutes = now.getMinutes();
  var seconds = now.getSeconds();
  return hours + ":" + minutes + ":" + seconds;
}

function simulateTyping(callback) {
  var typingDelay = Math.floor(Math.random() * 1000) + 250; // Randomize typing delay between 50 and 150 milliseconds
  var chatLog = document.getElementById("chatLog");
  var typingMessage = document.createElement("p");
  typingMessage.className = "typing-animation";
  typingMessage.innerHTML = "<span class='typing-indicator'></span>";

  chatLog.appendChild(typingMessage);
  chatLog.scrollTop = chatLog.scrollHeight;

  setTimeout(function() {
    chatLog.removeChild(typingMessage);
    callback();
  }, typingDelay);
}
function clearChat() {
  var chatLog = document.getElementById("chatLog");
  chatLog.innerHTML = "";
  chatBot.chatLog = [];
  chatBot.responseCount = 0;
}
function sendMessage() {
  var userInput = document.getElementById("userInput").value;

  // Process user input and generate a response
  var response = generateResponse(userInput);

  // Display the user message
  displayMessage(userInput, true);

  // Simulate typing effect before displaying the chatbot's response
  simulateTyping(function() {
    // Display the chatbot's response
    displayMessage(response, false);

    // Save the chatbot's response to chat log
    chatBot.chatLog.push(response);

    // Check if chat log exceeds maximum messages
    if (chatBot.chatLog.length > chatBot.chatMax) {
      chatBot.chatLog.shift(); // Remove the oldest message
    }

    // Increment response count
    chatBot.responseCount++;

    // Check if response count exceeds limit
    if (chatBot.responseCount >= 125) {
      disableChat();
    }
  });

  // Clear the user input
  document.getElementById("userInput").value = "";

  // Check for conversation end
  if (userInput.toLowerCase() === "bye") {
    displayMessage("Goodbye! Have a great day!", false);
    disableChat();
  }
}



  function history() {
  var messages = chatBot.chatLog;
  var historyText = "Chat History:\n\n";

  for (var i = 0; i < messages.length; i++) {
    historyText += messages[i] + "\n";
  }

  alert(historyText);
}

  
    // Function to disable the chat input field
    function disableChat() {
      document.getElementById("userInput").disabled = true;
    }
  // Function to display a greeting message with effect
function displayGreeting() {
  var greeting = "Welcome to the ChatBot!";
  var greetingContainer = document.getElementById("greetingContainer");
  greetingContainer.textContent = ""; // Clear the greeting container

  // Display each character of the greeting message with a delay
  for (var i = 0; i < greeting.length; i++) {
    (function (i) {
      setTimeout(function () {
        greetingContainer.textContent += greeting[i];
      }, 100 * i); // Delay between displaying each character (adjust as needed)
    })(i);
  }
}

// Call the greeting function on page load
displayGreeting();

    document.getElementById('userInput').addEventListener('keydown', event => {
      if (event.key === 'Enter') {
        sendMessage();
      }
    });