// Initialize session variables
let sessionStartTime;
let lastButtonClickTime;

// Function to generate a random session ID
function generateSessionId() {
  return (
    Math.random().toString(36).substring(2, 15) +
    Math.random().toString(36).substring(2, 15)
  );
}

// Function to fetch a random animal name from the server
async function getNextAnimal() {
  try {
    const response = await fetch("/getNextAnimal");
    const data = await response.json();
    document.getElementById("animal-name").textContent = data.animalName;
  } catch (error) {
    console.error("Error fetching data:", error);
  }
}

// Function to set or retrieve the session ID cookie
function getSessionId() {
  const sessionId = document.cookie.replace(
    /(?:(?:^|.*;\s*)sessionId\s*=\s*([^;]*).*$)|^.*$/,
    "$1",
  );
  if (!sessionId) {
    const newSessionId = generateSessionId();
    document.cookie = `sessionId=${newSessionId}`;
    return newSessionId;
  }
  return sessionId;
}

function clearSessionId() {
  const newSessionId = generateSessionId();
  document.cookie = `sessionId=${newSessionId}`;
  setSessionStartTime();
  getSessionId();
}

// Function to set session start time
function setSessionStartTime() {
  sessionStartTime = new Date();
}

// Function to calculate and display time difference
function displayTimeDifference() {
  if (sessionStartTime && lastButtonClickTime) {
    const timeDifference = lastButtonClickTime - sessionStartTime;
    console.log(`Time since session start: ${timeDifference} milliseconds`);
    // You can display the time difference on the page as needed
  }
}

// Add click event listeners to the buttons
document.getElementById("isCritterButton").addEventListener("click", () => {
  recordButtonClick("is critter", getSessionId());
});

document.getElementById("isNotCritterButton").addEventListener("click", () => {
  recordButtonClick("is not critter", getSessionId());
});

document.getElementById("startOverButton").addEventListener("click", () => {
  clearSessionId();
  getNextAnimal();
});

// Function to record button clicks on the server
async function recordButtonClick(buttonName, sessionId) {
  try {
    const currentTime = new Date();
    if (lastButtonClickTime) {
      const timeDifference = currentTime - lastButtonClickTime;
      // Include the time difference in the POST request data
      const animal = document.getElementById("animal-name").textContent;
      const bodyData = JSON.stringify({
        animal: animal,
        button: buttonName,
        session: sessionId,
        difference: timeDifference,
        time: sessionStartTime,
      });
      //console.log(bodyData);
      await fetch("/recordButtonClick", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: bodyData,
      });
    }
    lastButtonClickTime = currentTime; // Record the timestamp of the button click
    displayTimeDifference(); // Calculate and display time difference
    // TODO - slight delay before loading next animal, to show the user how long that decision took them
    getNextAnimal(); // Load another random animal
  } catch (error) {
    console.error("Error recording button click:", error);
  }
}

// Initial random animal load and session start time
getNextAnimal();
setSessionStartTime();