import Users from '/imports/api/users';
import VoiceUsers from '/imports/api/voice-users';
import GroupChat from '/imports/api/group-chat';
import Breakouts from '/imports/api/breakouts/';
import Meetings from '/imports/api/meetings';
import Auth from '/imports/ui/services/auth';
import Storage from '/imports/ui/services/storage/session';
import { EMOJI_STATUSES } from '/imports/utils/statuses';
import { makeCall } from '/imports/ui/services/api';
import _ from 'lodash';
import KEY_CODES from '/imports/utils/keyCodes';
import AudioService from '/imports/ui/components/audio/service';
import logger from '/imports/startup/client/logger';
import WhiteboardService from '/imports/ui/components/whiteboard/service';
import { Session } from 'meteor/session';

const CHAT_CONFIG = Meteor.settings.public.chat;
const PUBLIC_GROUP_CHAT_ID = CHAT_CONFIG.public_group_id;
const ROLE_MODERATOR = Meteor.settings.public.user.role_moderator;
const ROLE_VIEWER = Meteor.settings.public.user.role_viewer;

const DIAL_IN_CLIENT_TYPE = 'dial-in-user';

// session for closed chat list
const CLOSED_CHAT_LIST_KEY = 'closedChatList';
// session for chats the current user started
const STARTED_CHAT_LIST_KEY = 'startedChatList';

const CUSTOM_LOGO_URL_KEY = 'CustomLogoUrl';

export const setCustomLogoUrl = path => Storage.setItem(CUSTOM_LOGO_URL_KEY, path);

export const setModeratorOnlyMessage = msg => Storage.setItem('ModeratorOnlyMessage', msg);

const getCustomLogoUrl = () => Storage.getItem(CUSTOM_LOGO_URL_KEY);

const sortByWhiteboardAccess = (a, b) => {
  const _a = a.whiteboardAccess;
  const _b = b.whiteboardAccess;
  if (!_b && _a) return -1;
  if (!_a && _b) return 1;
  return 0;
};

const sortUsersByUserId = (a, b) => {
  if (a.userId > b.userId) {
    return -1;
  } if (a.userId < b.userId) {
    return 1;
  }

  return 0;
};

const sortUsersByName = (a, b) => {
  const aName = a.name ? a.name.toLowerCase() : '';
  const bName = b.name ? b.name.toLowerCase() : '';

  // Extending for sorting strings with non-ASCII characters
  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort#sorting_non-ascii_characters
  return aName.localeCompare(bName);
};

const sortUsersByEmoji = (a, b) => {
  if (a.emoji && b.emoji && (a.emoji !== 'none' && b.emoji !== 'none')) {
    if (a.emojiTime < b.emojiTime) {
      return -1;
    } if (a.emojiTime > b.emojiTime) {
      return 1;
    }
  } if (a.emoji && a.emoji !== 'none') {
    return -1;
  } if (b.emoji && b.emoji !== 'none') {
    return 1;
  }
  return 0;
};

const sortUsersByModerator = (a, b) => {
  if (a.role === ROLE_MODERATOR && b.role === ROLE_MODERATOR) {
    return 0;
  } if (a.role === ROLE_MODERATOR) {
    return -1;
  } if (b.role === ROLE_MODERATOR) {
    return 1;
  }

  return 0;
};

const sortUsersByPhoneUser = (a, b) => {
  if (!a.clientType === DIAL_IN_CLIENT_TYPE && !b.clientType === DIAL_IN_CLIENT_TYPE) {
    return 0;
  } if (!a.clientType === DIAL_IN_CLIENT_TYPE) {
    return -1;
  } if (!b.clientType === DIAL_IN_CLIENT_TYPE) {
    return 1;
  }

  return 0;
};

// current user's name is always on top
const sortUsersByCurrent = (a, b) => {
  if (a.userId === Auth.userID) {
    return -1;
  } if (b.userId === Auth.userID) {
    return 1;
  }

  return 0;
};

const sortUsers = (a, b) => {
  let sort = sortUsersByCurrent(a, b);

  if (sort === 0) {
    sort = sortUsersByModerator(a, b);
  }

  if (sort === 0) {
    sort = sortUsersByEmoji(a, b);
  }

  if (sort === 0) {
    sort = sortUsersByPhoneUser(a, b);
  }

  if (sort === 0) {
    sort = sortByWhiteboardAccess(a, b);
  }

  if (sort === 0) {
    sort = sortUsersByName(a, b);
  }

  if (sort === 0) {
    sort = sortUsersByUserId(a, b);
  }

  return sort;
};

const isPublicChat = chat => (
  chat.userId === 'public'
);

const userFindSorting = {
  emojiTime: 1,
  role: 1,
  phoneUser: 1,
  name: 1,
  userId: 1,
};

const addWhiteboardAccess = (users) => {
  const whiteboardId = WhiteboardService.getCurrentWhiteboardId();

  if (whiteboardId) {
    const multiUserWhiteboard = WhiteboardService.getMultiUser(whiteboardId);
    return users.map(user => {
      const whiteboardAccess = multiUserWhiteboard.includes(user.userId);

      return {
        ...user,
        whiteboardAccess,
      };
    });
  }

  return users.map(user => {
    const whiteboardAccess = false;
    return {
      ...user,
      whiteboardAccess,
    };
  });
};

const getUsers = () => {
  let users = Users
    .find({
      meetingId: Auth.meetingID,
    }, userFindSorting)
    .fetch();

  const currentUser = Users.findOne({ userId: Auth.userID }, { fields: { role: 1, locked: 1 } });
  if (currentUser && currentUser.role === ROLE_VIEWER && currentUser.locked) {
    const meeting = Meetings.findOne({ meetingId: Auth.meetingID },
      { fields: { 'lockSettingsProps.hideUserList': 1 } });
    if (meeting && meeting.lockSettingsProps && meeting.lockSettingsProps.hideUserList) {
      const moderatorOrCurrentUser = u => u.role === ROLE_MODERATOR || u.userId === Auth.userID;
      users = users.filter(moderatorOrCurrentUser);
    }
  }

  return addWhiteboardAccess(users).sort(sortUsers);
};

const getUserCount = () => {
  return Users.find({ meetingId: Auth.meetingID }).count();
};

const hasBreakoutRoom = () => Breakouts.find({ parentMeetingId: Auth.meetingID },
  { fields: {} }).count() > 0;

const isMe = userId => userId === Auth.userID;


const getActiveChats = ({ groupChatsMessages, groupChats, users }) => {

  if (_.isEmpty(groupChats) && _.isEmpty(users)) return [];
  
  const chatIds = Object.keys(groupChats);
  const lastTimeWindows = chatIds.reduce((acc, chatId) => {
    const chat = groupChatsMessages[chatId];
    const lastTimewindowKey = chat?.lastTimewindow;
    const lastTimeWindow = lastTimewindowKey?.split('-')[1];
    return {
      ...acc,
      chatId: lastTimeWindow,
    }
  }, {});

  chatIds.sort((a,b) => { 
    if (a === PUBLIC_GROUP_CHAT_ID) {
      return -1;
    }
  
    if (lastTimeWindows[a] === lastTimeWindows[b]){
      return 0;
    }
    
    return 1;
  });
  
  const chatInfo = chatIds.map((chatId) => {
    const contextChat = groupChatsMessages[chatId];
    const isPublicChat = chatId === PUBLIC_GROUP_CHAT_ID;
    let unreadMessagesCount = 0;
    if (contextChat) {
      const unreadTimewindows = contextChat.unreadTimeWindows;
      for (const unreadTimeWindowId of unreadTimewindows) {
        const timeWindow = (isPublicChat 
          ? contextChat?.preJoinMessages[unreadTimeWindowId] || contextChat?.posJoinMessages[unreadTimeWindowId]
          : contextChat?.messageGroups[unreadTimeWindowId]);
        unreadMessagesCount += timeWindow.content.length;
      }
    }

    if (chatId !== PUBLIC_GROUP_CHAT_ID) {
      const groupChatsParticipants = groupChats[chatId].participants;
      const otherParticipant = groupChatsParticipants.filter((user)=> user.id !== Auth.userID)[0];
      const user = users[otherParticipant.id];
      const startedChats = Session.get(STARTED_CHAT_LIST_KEY) || [];

      return {
        color: user?.color || '#7b1fa2',
        isModerator: user?.role === ROLE_MODERATOR,
        name: user?.name || otherParticipant.name,
        avatar: user?.avatar,
        chatId,
        unreadCounter: unreadMessagesCount,
        userId: user?.userId || otherParticipant.id,
        shouldDisplayInChatList: groupChats[chatId].createdBy === Auth.userID || startedChats.includes(chatId) || !!contextChat
      };
    }

    return {
      userId: 'public',
      name: 'Public Chat',
      icon: 'group_chat',
      chatId: 'public',
      unreadCounter: unreadMessagesCount,
      shouldDisplayInChatList: true
    };
  });
  
  const currentClosedChats = Storage.getItem(CLOSED_CHAT_LIST_KEY) || [];
  return chatInfo.filter(chat => !currentClosedChats.includes(chat.chatId) && chat.shouldDisplayInChatList);
}


const isVoiceOnlyUser = userId => userId.toString().startsWith('v_');

const isMeetingLocked = (id) => {
  const meeting = Meetings.findOne({ meetingId: id }, { fields: { lockSettingsProps: 1 } });
  let isLocked = false;

  if (meeting.lockSettingsProps !== undefined) {
    const lockSettings = meeting.lockSettingsProps;

    if (lockSettings.disableCam
      || lockSettings.disableMic
      || lockSettings.disablePrivateChat
      || lockSettings.disablePublicChat) {
      isLocked = true;
    }
  }

  return isLocked;
};

const getUsersProp = () => {
  const meeting = Meetings.findOne(
    { meetingId: Auth.meetingID },
    {
      fields: {
        'usersProp.allowModsToUnmuteUsers': 1,
        'usersProp.authenticatedGuest': 1,
      },
    }
  );

  if (meeting.usersProp) return meeting.usersProp;

  return {
    allowModsToUnmuteUsers: false,
    authenticatedGuest: false,
  }
};

const curatedVoiceUser = (intId) => {
  const voiceUser = VoiceUsers.findOne({ intId });
  return {
    isVoiceUser: voiceUser ? voiceUser.joined : false,
    isMuted: voiceUser ? voiceUser.muted && !voiceUser.listenOnly : false,
    isTalking: voiceUser ? voiceUser.talking && !voiceUser.muted : false,
    isListenOnly: voiceUser ? voiceUser.listenOnly : false,
  };
};

const getAvailableActions = (amIModerator, isBreakoutRoom, subjectUser, subjectVoiceUser, usersProp, amIPresenter) => {
  const isDialInUser = isVoiceOnlyUser(subjectUser.userId) || subjectUser.phone_user;
  const amISubjectUser = isMe(subjectUser.userId);
  const isSubjectUserModerator = subjectUser.role === ROLE_MODERATOR;
  const isSubjectUserGuest = subjectUser.guest;

  const hasAuthority = amIModerator || amISubjectUser;
  const allowedToChatPrivately = !amISubjectUser && !isDialInUser;
  const allowedToMuteAudio = hasAuthority
    && subjectVoiceUser.isVoiceUser
    && !subjectVoiceUser.isMuted
    && !subjectVoiceUser.isListenOnly;

  const allowedToUnmuteAudio = hasAuthority
    && subjectVoiceUser.isVoiceUser
    && !subjectVoiceUser.isListenOnly
    && subjectVoiceUser.isMuted
    && (amISubjectUser || usersProp.allowModsToUnmuteUsers);

  const allowedToResetStatus = hasAuthority
    && subjectUser.emoji !== EMOJI_STATUSES.none
    && !isDialInUser;

  // if currentUser is a moderator, allow removing other users
  const allowedToRemove = amIModerator
    && !amISubjectUser
    && !isBreakoutRoom;

  const allowedToSetPresenter = amIModerator
    && !subjectUser.presenter
    && !isDialInUser;

  const allowedToPromote = amIModerator
    && !amISubjectUser
    && !isSubjectUserModerator
    && !isDialInUser
    && !isBreakoutRoom
    && !(isSubjectUserGuest && usersProp.authenticatedGuest);

  const allowedToDemote = amIModerator
    && !amISubjectUser
    && isSubjectUserModerator
    && !isDialInUser
    && !isBreakoutRoom
    && !(isSubjectUserGuest && usersProp.authenticatedGuest);

  const allowedToChangeStatus = amISubjectUser;

  const allowedToChangeUserLockStatus = amIModerator
    && !isSubjectUserModerator
    && isMeetingLocked(Auth.meetingID);

  const allowedToChangeWhiteboardAccess = amIPresenter
    && !amISubjectUser;

  return {
    allowedToChatPrivately,
    allowedToMuteAudio,
    allowedToUnmuteAudio,
    allowedToResetStatus,
    allowedToRemove,
    allowedToSetPresenter,
    allowedToPromote,
    allowedToDemote,
    allowedToChangeStatus,
    allowedToChangeUserLockStatus,
    allowedToChangeWhiteboardAccess,
  };
};

const normalizeEmojiName = emoji => (
  emoji in EMOJI_STATUSES ? EMOJI_STATUSES[emoji] : emoji
);

const setEmojiStatus = _.debounce((userId, emoji) => {
  const statusAvailable = (Object.keys(EMOJI_STATUSES).includes(emoji));
  return statusAvailable
    ? makeCall('setEmojiStatus', Auth.userID, emoji)
    : makeCall('setEmojiStatus', userId, 'none');
}, 1000, { leading: true, trailing: false });

const clearAllEmojiStatus = (users) => {
  users.forEach(user => makeCall('setEmojiStatus', user.userId, 'none'));
};

const assignPresenter = (userId) => { makeCall('assignPresenter', userId); };

const removeUser = (userId, banUser) => {
  if (isVoiceOnlyUser(userId)) {
    makeCall('ejectUserFromVoice', userId);
  } else {
    makeCall('removeUser', userId, banUser);
  }
};

const toggleVoice = (userId) => {
  if (userId === Auth.userID) {
    AudioService.toggleMuteMicrophone();
  } else {
    makeCall('toggleVoice', userId);
    logger.info({
      logCode: 'usermenu_option_mute_toggle_audio',
      extraInfo: { logType: 'moderator_action', userId },
    }, 'moderator muted user microphone');
  }
};

const getEmoji = () => {
  const currentUser = Users.findOne({ userId: Auth.userID },
    { fields: { emoji: 1 } });

  if (!currentUser) {
    return false;
  }

  return currentUser.emoji;
};


const muteAllUsers = (userId) => { makeCall('muteAllUsers', userId); };

const muteAllExceptPresenter = (userId) => { makeCall('muteAllExceptPresenter', userId); };

const changeRole = (userId, role) => { makeCall('changeRole', userId, role); };

const focusFirstDropDownItem = () => {
  const dropdownContent = document.querySelector('div[data-test="dropdownContent"][style="visibility: visible;"]');
  if (!dropdownContent) return;
  const list = dropdownContent.getElementsByTagName('li');
  list[0].focus();
};

const roving = (...args) => {
  const [
    event,
    changeState,
    elementsList,
    element,
  ] = args;

  this.selectedElement = element;
  const numberOfChilds = elementsList.childElementCount;
  const menuOpen = Session.get('dropdownOpen') || false;

  if (menuOpen) {
    const menuChildren = document.activeElement.getElementsByTagName('li');

    if ([KEY_CODES.ESCAPE, KEY_CODES.ARROW_LEFT].includes(event.keyCode)) {
      Session.set('dropdownOpen', false);
      document.activeElement.click();
    }

    if ([KEY_CODES.ARROW_UP].includes(event.keyCode)) {
      menuChildren[menuChildren.length - 1].focus();
    }

    if ([KEY_CODES.ARROW_DOWN].includes(event.keyCode)) {
      for (let i = 0; i < menuChildren.length; i += 1) {
        if (menuChildren[i].hasAttribute('tabIndex')) {
          menuChildren[i].focus();
          break;
        }
      }
    }

    return;
  }

  if ([KEY_CODES.ESCAPE, KEY_CODES.TAB].includes(event.keyCode)) {
    Session.set('dropdownOpen', false);
    document.activeElement.blur();
    changeState(null);
  }

  if (event.keyCode === KEY_CODES.ARROW_DOWN) {
    const firstElement = elementsList.firstChild;
    let elRef = element && numberOfChilds > 1 ? element.nextSibling : firstElement;

    elRef = elRef || firstElement;
    changeState(elRef);
  }

  if (event.keyCode === KEY_CODES.ARROW_UP) {
    const lastElement = elementsList.lastChild;
    let elRef = element ? element.previousSibling : lastElement;
    elRef = elRef || lastElement;
    changeState(elRef);
  }

  if ([KEY_CODES.ARROW_RIGHT, KEY_CODES.SPACE, KEY_CODES.ENTER].includes(event.keyCode)) {
    const tether = document.activeElement.firstChild;
    const dropdownTrigger = tether.firstChild;
    dropdownTrigger.click();
    focusFirstDropDownItem();
  }
};

const hasPrivateChatBetweenUsers = (senderId, receiverId) => GroupChat
  .findOne({ users: { $all: [receiverId, senderId] } });

const getGroupChatPrivate = (senderUserId, receiver) => {
  const chat = hasPrivateChatBetweenUsers(senderUserId, receiver.userId);
  if (!chat) {
    makeCall('createGroupChat', receiver);
  } else {
    const startedChats = Session.get(STARTED_CHAT_LIST_KEY) || [];
    if (_.indexOf(startedChats, chat.chatId) < 0) {
      startedChats.push(chat.chatId);
      Session.set(STARTED_CHAT_LIST_KEY, startedChats);
    }

    const currentClosedChats = Storage.getItem(CLOSED_CHAT_LIST_KEY);
    if (_.indexOf(currentClosedChats, chat.chatId) > -1) {
      Storage.setItem(CLOSED_CHAT_LIST_KEY, _.without(currentClosedChats, chat.chatId));
    }
  }
};

const toggleUserLock = (userId, lockStatus) => {
  makeCall('toggleUserLock', userId, lockStatus);
};

const requestUserInformation = (userId) => {
  makeCall('requestUserInformation', userId);
};

const sortUsersByFirstName = (a, b) => {
  const aUser = { name: a.firstName ? a.firstName : '' };
  const bUser = { name: b.firstName ? b.firstName : '' };

  return sortUsersByName(aUser, bUser);
};

const sortUsersByLastName = (a, b) => {
  const aUser = { name: a.lastName ? a.lastName : '' };
  const bUser = { name: b.lastName ? b.lastName : '' };

  return sortUsersByName(aUser, bUser);
};

const isUserPresenter = (userId) => {
  const user = Users.findOne({ userId },
    { fields: { presenter: 1 } });
  return user ? user.presenter : false;
};

const amIPresenter = () => {
  return isUserPresenter(Auth.userID);
};

export const getUserNamesLink = (docTitle, fnSortedLabel, lnSortedLabel) => {
  const mimeType = 'text/plain';
  const userNamesObj = getUsers()
    .map((u) => {
      const name = u.name.split(' ');
      return ({
        firstName: name[0],
        middleNames: name.length > 2 ? name.slice(1, name.length - 1) : null,
        lastName: name.length > 1 ? name[name.length - 1] : null,
      });
    });

  const getUsernameString = (user) => {
    const { firstName, middleNames, lastName } = user;
    return `${firstName || ''} ${middleNames && middleNames.length > 0 ? middleNames.join(' ') : ''} ${lastName || ''}`;
  };

  const namesByFirstName = userNamesObj.sort(sortUsersByFirstName)
    .map(u => getUsernameString(u)).join('\r\n');

  const namesByLastName = userNamesObj.sort(sortUsersByLastName)
    .map(u => getUsernameString(u)).join('\r\n');

  const namesListsString = `${docTitle}\r\n\r\n${fnSortedLabel}\r\n${namesByFirstName}
    \r\n\r\n${lnSortedLabel}\r\n${namesByLastName}`.replace(/ {2}/g, ' ');

  const link = document.createElement('a');
  const meeting = Meetings.findOne({ meetingId: Auth.meetingID },
    { fields: { 'meetingProp.name': 1 } });
  const date = new Date();
  const time = `${date.getHours()}-${date.getMinutes()}`;
  const dateString = `${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()}_${time}`;
  link.setAttribute('download', `bbb-${meeting.meetingProp.name}[users-list]_${dateString}.txt`);
  link.setAttribute(
    'href',
    `data: ${mimeType} ;charset=utf-16,${encodeURIComponent(namesListsString)}`,
  );
  return link;
};

export default {
  sortUsersByName,
  sortUsers,
  setEmojiStatus,
  clearAllEmojiStatus,
  assignPresenter,
  removeUser,
  toggleVoice,
  muteAllUsers,
  muteAllExceptPresenter,
  changeRole,
  getUsers,
  getActiveChats,
  getAvailableActions,
  curatedVoiceUser,
  normalizeEmojiName,
  isMeetingLocked,
  isPublicChat,
  roving,
  getCustomLogoUrl,
  getGroupChatPrivate,
  hasBreakoutRoom,
  getEmojiList: () => EMOJI_STATUSES,
  getEmoji,
  hasPrivateChatBetweenUsers,
  toggleUserLock,
  requestUserInformation,
  focusFirstDropDownItem,
  isUserPresenter,
  amIPresenter,
  getUsersProp,
  getUserCount,
  sortUsersByCurrent,
};