// chat.js
// Copyright (C) 2024 DTP Technologies, LLC
// All Rights Reserved

'use strict';

import mongoose from 'mongoose';
const ChatRoom = mongoose.model('ChatRoom');
const ChatMessage = mongoose.model('ChatMessage');
// const ChatRoomInvite = mongoose.model('ChatRoomInvite');

import numeral from 'numeral';

import { SiteService, SiteError } from '../../lib/site-lib.js';
import { MAX_ROOM_CAPACITY } from '../models/lib/constants.js';

export default class ChatService extends SiteService {

  static get name ( ) { return 'ChatService'; }
  static get slug () { return 'chat'; }

  constructor (dtp) {
    super(dtp, ChatService);
  }

  async start ( ) {
    const { link: linkService, user: userService } = this.dtp.services;

    this.templates = {
      message: this.loadViewTemplate('chat/components/message-standalone.pug'),
      memberListItem: this.loadViewTemplate('chat/components/member-list-item-standalone.pug'),
    };

    this.populateChatRoom = [
      {
        path: 'owner',
        select: userService.USER_SELECT,
      },
      {
        path: 'present',
        select: userService.USER_SELECT,
      },
    ];
    this.populateChatMessage = [
      {
        path: 'channel',
      },
      {
        path: 'author',
        select: userService.USER_SELECT,
      },
      {
        path: 'mentions',
        select: userService.USER_SELECT,
      },
      {
        path: 'links',
        populate: linkService.populateLink,

      },
    ];
  }

  async createRoom (owner, roomDefinition) {
    const { text: textService } = this.dtp.services;
    const NOW = new Date();

    const room = new ChatRoom();
    room.created = NOW;
    room.owner = owner._id;
    room.name = textService.filter(roomDefinition.name);
    if (roomDefinition.topic) {
      room.topic = textService.filter(roomDefinition.topic);
    }
    room.capacity = MAX_ROOM_CAPACITY;
    room.members = [owner._id];
    room.stats.memberCount = 1;

    await room.save();

    return room.toObject();
  }

  async destroyRoom (user, room) {
    if (user._id.equals(room.owner._id)) {
      throw new SiteError(401, 'This is not your chat room');
    }
    await this.removeMessagesForChannel(room);
    await ChatRoom.deleteOne({ _id: room._id });
  }

  async joinRoom (room, user) {
    const roomData = await ChatRoom.findOne({ _id: room._id, banned: user._id }).lean();
    if (roomData) {
      throw new SiteError(401, 'You are banned from this chat room');
    }

    const response = await ChatRoom.updateOne(
      { _id: room._id },
      {
        $push: { members: user._id },
      },
    );

    this.log.debug('joinRoom complete', { response });
    return response;
  }

  async chatRoomCheckIn (room, member) {
    const NOW = new Date();

    // indicate presence in the chat room's Mongo document
    const roomData = await ChatRoom.findOneAndUpdate(
      { _id: room._id },
      {
        $addToSet: { present: member._id },
        $inc: { 'stats.presentCount': 1 },
      },
      {
        new: true,
      },
    );

    this.log.debug('member checking into chat room', {
      room: {
        _id: room._id,
        name: room.name,
        presentCount: roomData.stats.presentCount,
      },
      member: {
        _id: member._id,
        username: member.username,
      },
    });

    /*
     * Broadcast a control message to all room members that a new member has
     * joined the room.
     */
    const displayList = this.createDisplayList('chat-control');
    displayList.removeElement(`ul#present-members li[data-member-id="${member._id}"]`);
    displayList.addElement(
      `ul#chat-active-members[data-room-id="${room._id}"]`,
      'afterBegin',
      this.templates.memberListItem({ room, member }),
    );

    displayList.setTextContent(
      `.chat-present-count`,
      numeral(roomData.stats.presentCount).format('0,0'),
    );

    const systemMessage = {
      created: NOW.toISOString(),
      content: `${member.displayName || member.username} has entered the room.`,
    };

    this.dtp.emitter
      .to(room._id.toString())
      .emit('chat-control', {
        displayList,
        systemMessages: [systemMessage],
      });
  }

  async chatRoomCheckOut (room, member) {
    const NOW = new Date();
    const roomData = await ChatRoom.findOneAndUpdate(
      { _id: room._id },
      {
        $pull: { present: member._id },
        $inc: { 'stats.presentCount': -1 },
      },
      {
        new: true,
      },
    );

    this.log.debug('member checking out of chat room', {
      room: {
        _id: room._id,
        name: room.name,
        presentCount: roomData.stats.presentCount,
      },
      member: {
        _id: member._id,
        username: member.username,
      },
    });

    /*
     * Broadcast a control message to all room members that a new member has
     * joined the room.
     */
    const displayList = this.createDisplayList('chat-control');
    displayList.removeElement(`ul#chat-active-members li[data-member-id="${member._id}"]`);

    displayList.setTextContent(
      `.chat-present-count`,
      numeral(roomData.stats.presentCount).format('0,0'),
    );

    const systemMessage = {
      created: NOW.toISOString(),
      content: `<a href="/member/${member.username}", uk-tooltip="Visit ${member.username}">@${member.username}</a> has connected to the room.`,
    };

    this.dtp.emitter.to(room._id.toString()).emit('chat-control', { displayList, systemMessages: [systemMessage] });
  }

  async sendRoomMessage (room, author, messageDefinition, imageFiles, videoFiles) {
    const { text: textService, user: userService } = this.dtp.services;
    const NOW = new Date();

    const message = new ChatMessage();
    message.created = NOW;
    message.channelType = 'ChatRoom';
    message.channel = room._id;
    message.author = author._id;
    message.content = textService.filter(messageDefinition.content);

    message.mentions = await textService.findMentions(message.content);
    message.hashtags = await textService.findHashtags(message.content);
    message.links = await textService.findLinks(author, message.content, { channelId: room._id });

    await message.save();

    const messageObj = message.toObject();
    
    let viewModel = Object.assign({ }, this.dtp.app.locals);
    messageObj.author = userService.filterUserObject(author);
    viewModel = Object.assign(viewModel, { message: messageObj });

    const html = this.templates.message(viewModel);
    this.dtp.emitter
      .to(room._id.toString())
      .emit('chat-message', { message: messageObj, html });

    return messageObj;
  }

  async getRoomMessages (room, pagination) {
    const messages = await ChatMessage
      .find({ channel: room._id })
      .sort({ created: -1 })
      .skip(pagination.skip)
      .limit(pagination.cpp)
      .populate(this.populateChatMessage)
      .lean();
    return messages.reverse();
  }

  async checkRoomMember (room, member) {
    if (room.owner._id.equals(member._id)) {
      return true;
    }

    const search = { _id: room._id, members: member._id };
    const checkRoom = await ChatRoom.findOne(search).select('name').lean();
    if (!checkRoom) {
      throw new SiteError(403, `You are not a member of ${checkRoom.name}`);
    }

    return true;
  }

  async isRoomMember (room, member) {
    if (room.owner._id.equals(member._id)) {
      return true;
    }
    const search = { _id: room._id, members: member._id };
    const checkRoom = await ChatRoom.findOne(search).select('name').lean();
    return !!checkRoom;
  }

  async leaveRoom (room, user) {
    await ChatRoom.updateOne(
      { _id: room._id },
      {
        $pull: { members: user._id },
      },
    );
  }

  async getRoomMemberList (room) {
    const roomData = await ChatRoom.findOne({ _id: room._id }).select('members');
    if (!roomData) {
      throw new SiteError(404, 'Room not found');
    }
    return roomData.members;
  }

  async getRoomBlockList (room) {
    const roomData = await ChatRoom.findOne({ _id: room._id }).select('members');
    if (!roomData) {
      throw new SiteError(404, 'Room not found');
    }
    return roomData.banned;
  }

  async getRoomById (roomId) {
    const room = await ChatRoom
      .findOne({ _id: roomId })
      .populate(this.populateChatRoom)
      .lean();
    return room;
  }

  async getRoomsForOwner (owner) {
    const rooms = await ChatRoom
      .find({ owner: owner._id })
      .populate(this.populateChatRoom)
      .lean();
    return rooms;
  }

  async getRoomsForMember (member, pagination) {
    const rooms = await ChatRoom
      .find({ members: member._id })
      .populate(this.populateChatRoom)
      .skip(pagination.skip)
      .limit(pagination.cpp)
      .lean();
    return rooms;
  }

  async removeMessagesForChannel (channel) {
    await ChatMessage.deleteMany({ channel: channel._id });
  }
}