import Hyperswarm from 'hyperswarm';
import crypto from 'hypercore-crypto';
import b4a from 'b4a';
import ServeDrive from 'serve-drive';
import Hyperdrive from 'hyperdrive';
import Corestore from 'corestore';
import { EventEmitter } from 'events';
import fs from "fs";

const storagePath = `./storage/`;
const store = new Corestore(storagePath);
const drive = new Hyperdrive(store);

await drive.ready();

let swarm;
let registeredUsers = JSON.parse(localStorage.getItem('registeredUsers')) || {};
let peerCount = 0;
let activeRooms = [];
const eventEmitter = new EventEmitter();

// Define servePort at the top level
let servePort;

// Object to store all the information we want to save
let config = {
  userName: '',
  userAvatar: '',
  rooms: []
};

// Store messages for each room
let messagesStore = {};

// Function to get a random port between 49152 and 65535
function getRandomPort() {
  return Math.floor(Math.random() * (65535 - 49152 + 1)) + 49152;
}

async function initialize() {
  swarm = new Hyperswarm();

  servePort = getRandomPort();
  const serve = new ServeDrive({ port: servePort, get: ({ key, filename, version }) => drive });
  await serve.ready();
  console.log('Listening on http://localhost:' + serve.address().port);

  const registerForm = document.querySelector('#register-form');
  const selectAvatarButton = document.querySelector('#select-avatar');
  const createChatRoomButton = document.querySelector('#create-chat-room');
  const joinChatRoomButton = document.querySelector('#join-chat-room');
  const messageForm = document.querySelector('#message-form');
  const toggleSetupBtn = document.querySelector('#toggle-setup-btn');
  const removeRoomBtn = document.querySelector('#remove-room-btn');
  const attachFileButton = document.getElementById('attach-file');
  const fileInput = document.getElementById('file-input');

  if (registerForm) {
    registerForm.addEventListener('submit', registerUser);
  }
  if (selectAvatarButton) {
    selectAvatarButton.addEventListener('click', () => {
      document.querySelector('#avatar-file').click();
    });
  }
  if (createChatRoomButton) {
    createChatRoomButton.addEventListener('click', createChatRoom);
  }
  if (joinChatRoomButton) {
    joinChatRoomButton.addEventListener('click', joinChatRoom);
  }
  if (messageForm) {
    messageForm.addEventListener('submit', sendMessage);
  }
  if (toggleSetupBtn) {
    toggleSetupBtn.addEventListener('click', toggleSetupView);
  }
  if (removeRoomBtn) {
    removeRoomBtn.addEventListener('click', () => {
      const topic = document.querySelector('#chat-room-topic').innerText;
      leaveRoom(topic);
    });
  }
  if (attachFileButton) {
    attachFileButton.addEventListener('click', () => fileInput.click());
  }
  if (fileInput) {
    fileInput.addEventListener('change', handleFileInput);
  }

  const configExists = fs.existsSync("./config.json");
  if (configExists) {
    config = JSON.parse(fs.readFileSync("./config.json", 'utf8'));
    console.log("Read config from file:", config);
    // Update port in URLs
    config.userAvatar = updatePortInUrl(config.userAvatar);
    config.rooms.forEach(room => {
      room.alias = room.alias || truncateHash(room.topic);
    });
    for (let user in registeredUsers) {
      registeredUsers[user] = updatePortInUrl(registeredUsers[user]);
    }

    renderRoomList(); // Render the room list with aliases

    // Connect to all rooms on startup
    for (const room of config.rooms) {
      const topicBuffer = b4a.from(room.topic, 'hex');
      await joinSwarm(topicBuffer);
    }
  }

  const registerDiv = document.querySelector('#register');
  if (registerDiv && !configExists) {
    registerDiv.classList.remove('hidden');
  }

  eventEmitter.on('onMessage', async (messageObj) => {
    console.log('Received message:', messageObj); // Debugging log

    if (messageObj.type === 'icon') {
      const username = messageObj.username;
      if (messageObj.avatar) {
        const avatarBuffer = b4a.from(messageObj.avatar, 'base64');
        await drive.put(`/icons/${username}.png`, avatarBuffer);
        updateIcon(username, avatarBuffer);
      } else {
        console.error('Received icon message with missing avatar data:', messageObj);
      }
    } else if (messageObj.type === 'file') {
      if (messageObj.file && messageObj.fileName) {
        const fileBuffer = b4a.from(messageObj.file, 'base64');
        await drive.put(`/files/${messageObj.fileName}`, fileBuffer);
        const fileUrl = `http://localhost:${servePort}/files/${messageObj.fileName}`;
        addFileMessage(messageObj.name, messageObj.fileName, updatePortInUrl(fileUrl), messageObj.fileType, updatePortInUrl(messageObj.avatar), messageObj.topic);
      } else {
        console.error('Received file message with missing file data or fileName:', messageObj);
      }
    } else if (messageObj.type === 'message') {
      onMessageAdded(messageObj.name, messageObj.message, messageObj.avatar, messageObj.topic);
    } else {
      console.error('Received unknown message type:', messageObj);
    }
  });

  swarm.on('connection', async (connection, info) => {
    peerCount++;
    updatePeerCount();
    console.log('Peer connected, current peer count:', peerCount);

    // Send the current user's icon to the new peer
    const iconBuffer = await drive.get(`/icons/${config.userName}.png`);
    if (iconBuffer) {
      const iconMessage = JSON.stringify({
        type: 'icon',
        username: config.userName,
        avatar: b4a.toString(iconBuffer, 'base64'),
      });
      connection.write(iconMessage);
    }

    connection.on('data', (data) => {
      const messageObj = JSON.parse(data.toString());
      eventEmitter.emit('onMessage', messageObj);
    });

    connection.on('close', () => {
      peerCount--;
      updatePeerCount();
      console.log('Peer disconnected, current peer count:', peerCount);
    });
  });

  swarm.on('error', (err) => {
    console.error('Swarm error:', err);
  });

  swarm.on('close', () => {
    console.log('Swarm closed');
  });

  // Initialize highlight.js once the DOM is fully loaded
  document.addEventListener("DOMContentLoaded", (event) => {
    hljs.highlightAll();
  });
}

function registerUser(e) {
  e.preventDefault();
  const regUsername = document.querySelector('#reg-username').value;

  if (registeredUsers[regUsername]) {
    alert('Username already taken. Please choose another.');
    return;
  }

  const avatarFile = document.querySelector('#avatar-file').files[0];
  if (avatarFile) {
    const reader = new FileReader();
    reader.onload = async (event) => {
      const buffer = new Uint8Array(event.target.result);
      await drive.put(`/icons/${regUsername}.png`, buffer);
      config.userAvatar = `http://localhost:${servePort}/icons/${regUsername}.png`; // Set the correct URL
      registeredUsers[regUsername] = `http://localhost:${servePort}/icons/${regUsername}.png`; // Use placeholder URL
      localStorage.setItem('registeredUsers', JSON.stringify(registeredUsers));
      continueRegistration(regUsername);
    };
    reader.readAsArrayBuffer(avatarFile);
  } else {
    continueRegistration(regUsername);
  }
}

async function continueRegistration(regUsername) {
  const loadingDiv = document.querySelector('#loading');
  const setupDiv = document.querySelector('#setup');

  if (!regUsername) {
    alert('Please enter a username.');
    return;
  }

  config.userName = regUsername;
  setupDiv.classList.remove('hidden');
  document.querySelector('#register').classList.add('hidden');
  loadingDiv.classList.add('hidden');

  const randomTopic = crypto.randomBytes(32);
  document.querySelector('#chat-room-topic').innerText = truncateHash(b4a.toString(randomTopic, 'hex'));

  writeConfigToFile("./config.json");
}

async function createChatRoom() {
  const topicBuffer = crypto.randomBytes(32);
  const topic = b4a.toString(topicBuffer, 'hex');
  addRoomToList(topic);
  await joinSwarm(topicBuffer);
}

async function joinChatRoom(e) {
  e.preventDefault();
  const topicStr = document.querySelector('#join-chat-room-topic').value;
  const topicBuffer = b4a.from(topicStr, 'hex');
  addRoomToList(topicStr);
  await joinSwarm(topicBuffer);
}

async function joinSwarm(topicBuffer) {
  const topic = b4a.toString(topicBuffer, 'hex');
  if (!activeRooms.some(room => room.topic === topic)) {
    const discovery = swarm.join(topicBuffer, { client: true, server: true });
    await discovery.flushed();

    activeRooms.push({ topic, discovery });

    console.log('Joined room:', topic); // Debugging log

    renderMessagesForRoom(topic);
  }
}

function addRoomToList(topic) {
  const roomList = document.querySelector('#room-list');
  const roomItem = document.createElement('li');
  roomItem.textContent = truncateHash(topic);
  roomItem.dataset.topic = topic;

  roomItem.addEventListener('dblclick', () => enterEditMode(roomItem));
  roomItem.addEventListener('click', () => switchRoom(topic));
  roomList.appendChild(roomItem);

  config.rooms.push({ topic, alias: truncateHash(topic) });
  writeConfigToFile("./config.json");
}

function enterEditMode(roomItem) {
  const originalText = roomItem.textContent;
  const topic = roomItem.dataset.topic;
  roomItem.innerHTML = '';

  const input = document.createElement('input');
  input.type = 'text';
  input.value = originalText;
  input.style.maxWidth = '100%'; // Add this line to set the max width
  input.style.boxSizing = 'border-box'; // Add this line to ensure padding and border are included in the width

  roomItem.appendChild(input);

  input.focus();

  input.addEventListener('blur', () => {
    exitEditMode(roomItem, input, topic);
  });

  input.addEventListener('keydown', (e) => {
    if (e.key === 'Enter') {
      exitEditMode(roomItem, input, topic);
    } else if (e.key === 'Escape') {
      roomItem.textContent = originalText;
    }
  });
}

function exitEditMode(roomItem, input, topic) {
  const newAlias = input.value.trim();
  if (newAlias) {
    roomItem.textContent = newAlias;

    // Update the config with the new alias
    const roomConfig = config.rooms.find(room => room.topic === topic);
    if (roomConfig) {
      roomConfig.alias = newAlias;
      writeConfigToFile("./config.json");
    }

    // Check if the edited room is the current room in view
    const currentTopic = document.querySelector('#chat-room-topic').innerText;
    if (currentTopic === topic) {
      const chatRoomName = document.querySelector('#chat-room-name');
      if (chatRoomName) {
        chatRoomName.innerText = newAlias;
      }
    }
  } else {
    roomItem.textContent = truncateHash(topic);
  }
}

function switchRoom(topic) {
  console.log('Switching to room:', topic); // Debugging log
  const chatRoomTopic = document.querySelector('#chat-room-topic');
  const chatRoomName = document.querySelector('#chat-room-name');

  if (chatRoomTopic) {
    chatRoomTopic.innerText = topic; // Set full topic here
  } else {
    console.error('Element #chat-room-topic not found');
  }

  if (chatRoomName) {
    // Update the room name in the header
    const room = config.rooms.find(r => r.topic === topic);
    const roomName = room ? room.alias : truncateHash(topic);
    chatRoomName.innerText = roomName;
  } else {
    console.error('Element #chat-room-name not found');
  }

  clearMessages();
  renderMessagesForRoom(topic);

  // Show chat UI elements
  document.querySelector('#chat').classList.remove('hidden');
  document.querySelector('#setup').classList.add('hidden');
}

function leaveRoom(topic) {
  const roomIndex = activeRooms.findIndex(room => room.topic === topic);
  if (roomIndex !== -1) {
    const room = activeRooms[roomIndex];
    room.discovery.destroy();
    activeRooms.splice(roomIndex, 1);
  }

  const roomItem = document.querySelector(`li[data-topic="${topic}"]`);
  if (roomItem) {
    roomItem.remove();
  }

  config.rooms = config.rooms.filter(e => e.topic !== topic);
  writeConfigToFile("./config.json");

  if (activeRooms.length > 0) {
    switchRoom(activeRooms[0].topic);
  } else {
    document.querySelector('#chat').classList.add('hidden');
    document.querySelector('#setup').classList.remove('hidden');
  }
}

function sendMessage(e) {
  e.preventDefault();
  const message = document.querySelector('#message').value;
  document.querySelector('#message').value = '';

  const topic = document.querySelector('#chat-room-topic').innerText;

  console.log('Sending message:', message); // Debugging log

  onMessageAdded(config.userName, message, config.userAvatar, topic);

  const messageObj = JSON.stringify({
    type: 'message',
    name: config.userName,
    message,
    avatar: config.userAvatar,
    topic: topic,
    timestamp: Date.now()
  });

  const peers = [...swarm.connections];
  for (const peer of peers) {
    peer.write(messageObj);
  }
}

async function handleFileInput(event) {
  const file = event.target.files[0];
  if (file) {
    const reader = new FileReader();
    reader.onload = async (event) => {
      const buffer = new Uint8Array(event.target.result);
      const filePath = `/files/${file.name}`;
      await drive.put(filePath, buffer);
      const fileUrl = `http://localhost:${servePort}${filePath}`;

      const topic = document.querySelector('#chat-room-topic').innerText;

      const fileMessage = {
        type: 'file',
        name: config.userName,
        fileName: file.name,
        file: b4a.toString(buffer, 'base64'),
        fileType: file.type,
        avatar: updatePortInUrl(config.userAvatar),
        topic: topic
      };

      console.log('Sending file message:', fileMessage); // Debugging log

      const peers = [...swarm.connections];
      for (const peer of peers) {
        peer.write(JSON.stringify(fileMessage));
      }

      addFileMessage(config.userName, file.name, fileUrl, file.type, config.userAvatar, topic);
    };
    reader.readAsArrayBuffer(file);
  }
}

function addFileMessage(from, fileName, fileUrl, fileType, avatar, topic) {
  console.log('Adding file message:', { from, fileName, fileUrl, fileType, avatar, topic }); // Debugging log
  const $div = document.createElement('div');
  $div.classList.add('message');

  const $img = document.createElement('img');
  $img.src = avatar || 'https://via.placeholder.com/40';
  $img.classList.add('avatar');
  $div.appendChild($img);

  const $content = document.createElement('div');
  $content.classList.add('message-content');

  const $header = document.createElement('div');
  $header.classList.add('message-header');
  $header.textContent = from;
  $content.appendChild($header);

  if (fileType.startsWith('image/')) {
    const $image = document.createElement('img');
    $image.src = fileUrl;
    $image.alt = fileName;
    $image.classList.add('attached-image');
    $content.appendChild($image);
  } else {
    const $fileButton = document.createElement('button');
    $fileButton.textContent = `Download File: ${fileName}`;
    $fileButton.onclick = function() {
      const $fileLink = document.createElement('a');
      $fileLink.href = fileUrl;
      $fileLink.download = fileName;
      $fileLink.click();
    };
    $content.appendChild($fileButton);    
  }

  $div.appendChild($content);

  // Only render the message if it's for the current room
  const currentTopic = document.querySelector('#chat-room-topic').innerText;
  if (currentTopic === topic) {
    document.querySelector('#messages').appendChild($div);
    scrollToBottom();
  } else {
    console.log(`Message for topic ${topic} not rendered because current topic is ${currentTopic}`); // Debugging log
  }
}

function updatePeerCount() {
  const peerCountElement = document.querySelector('#peers-count');
  if (peerCountElement) {
    peerCountElement.textContent = peerCount; // Display the actual peer count
  }
}

function scrollToBottom() {
  var container = document.getElementById("messages-container");
  container.scrollTop = container.scrollHeight;
}

function onMessageAdded(from, message, avatar, topic) {
  console.log('Adding message:', { from, message, avatar, topic }); // Debugging log
  const messageObj = {
    from,
    message,
    avatar
  };
  
  // Add the message to the store
  addMessageToStore(topic, messageObj);

  // Only render messages for the current room
  const currentTopic = document.querySelector('#chat-room-topic').innerText;
  if (currentTopic === topic) {
    const $div = document.createElement('div');
    $div.classList.add('message');

    const $img = document.createElement('img');
    $img.src = updatePortInUrl(avatar) || 'https://via.placeholder.com/40'; // Default to a placeholder image if avatar URL is not provided
    $img.classList.add('avatar');
    $div.appendChild($img);

    const $content = document.createElement('div');
    $content.classList.add('message-content');

    const $header = document.createElement('div');
    $header.classList.add('message-header');
    $header.textContent = from;

    const $text = document.createElement('div');
    $text.classList.add('message-text');

    const md = window.markdownit({
      highlight: function (str, lang) {
        if (lang && hljs.getLanguage(lang)) {
          try {
            return hljs.highlight(str, { language: lang }).value;
          } catch (__) {}
        }
        return ''; // use external default escaping
      }
    });

    const markdownContent = md.render(message);
    $text.innerHTML = markdownContent;

    $content.appendChild($header);
    $content.appendChild($text);
    $div.appendChild($content);

    document.querySelector('#messages').appendChild($div);
    scrollToBottom();
  } else {
    console.log(`Message for topic ${topic} not rendered because current topic is ${currentTopic}`); // Debugging log
  }
}

function truncateHash(hash) {
  return `${hash.slice(0, 6)}...${hash.slice(-6)}`;
}

async function updateIcon(username, avatarBuffer) {
  const userIcon = document.querySelector(`img[src*="${username}.png"]`);
  if (userIcon) {
    const avatarBlob = new Blob([avatarBuffer], { type: 'image/png' });
    const avatarUrl = URL.createObjectURL(avatarBlob);
    userIcon.src = updatePortInUrl(avatarUrl);

    config.userAvatar = avatarUrl;
    writeConfigToFile("./config.json");
  }
}

function clearMessages() {
  const messagesContainer = document.querySelector('#messages');
  while (messagesContainer.firstChild) {
    messagesContainer.removeChild(messagesContainer.firstChild);
  }
}

function toggleSetupView() {
  const setupDiv = document.querySelector('#setup');
  setupDiv.classList.toggle('hidden');
}

function writeConfigToFile(filePath) {
  fs.writeFile(filePath, JSON.stringify(config), (err) => {
    if (err) return console.error(err);
    console.log("File has been created");
  });
}

function updatePortInUrl(url) {
  if (!url) return url;
  const urlObject = new URL(url);
  urlObject.port = servePort;
  return urlObject.toString();
}

function renderRoomList() {
  const roomList = document.querySelector('#room-list');
  roomList.innerHTML = '';

  config.rooms.forEach(room => {
    const roomItem = document.createElement('li');
    roomItem.textContent = room.alias || truncateHash(room.topic);
    roomItem.dataset.topic = room.topic;

    roomItem.addEventListener('dblclick', () => enterEditMode(roomItem));
    roomItem.addEventListener('click', () => switchRoom(room.topic));
    roomList.appendChild(roomItem);
  });
}

function renderMessagesForRoom(topic) {
  console.log('Rendering messages for room:', topic); // Debugging log
  // Clear the message area
  clearMessages();

  // Fetch and render messages for the selected room
  const messages = getMessagesForRoom(topic);
  messages.forEach(message => {
    onMessageAdded(message.from, message.message, message.avatar, topic);
  });
}

function getMessagesForRoom(topic) {
  return messagesStore[topic] || [];
}

function addMessageToStore(topic, messageObj) {
  if (!messagesStore[topic]) {
    messagesStore[topic] = [];
  }
  messagesStore[topic].push(messageObj);
}

// Call this function when loading the rooms initially
renderRoomList();

initialize();