const ChatModel = require('../model/chat');
const UserModel = require('../model/user');
const MessageModel = require('../model/message');

const listChats = async (req, res, next) => {
	try {
		const userId = req.user.id;
		const chats = await ChatModel.getList(userId, req.query);
		const messages = await MessageModel.getLastMessagesList(userId);
		const lastMessages = await messages.reduce(
			(acc, { message, companionId }) => {
				const obj = { message, companionId };
				if (acc.length === 0) {
					acc.push(obj);
					return acc;
				}
				if (acc.some((el) => el.companionId === companionId)) {
					const i = acc.findIndex((el) => {
						return el.companionId === companionId;
					});
					acc[i] = obj;
					return acc;
				}
				acc.push(obj);
				return acc;
			},
			[]
		);

		return res.json({
			status: 'success',
			code: 200,
			data: {
				...chats,
				lastMessages,
			},
		});
	} catch (e) {
		next(e);
	}
};

const startChat = async (req, res, next) => {
	try {
		const id = req.body.id;
		const user = req.user;
		const userId = user.id;
		const companion = await UserModel.findById(id);
		const isUser = await ChatModel.getByField(id, userId);
		const isCompanion = await ChatModel.getByField(userId, id);
		const { name, lastName, avatarUrl, color, online, number } = companion;
		const {
			name: Name,
			lastName: LastName,
			avatarUrl: AvatarUrl,
			color: Color,
			online: Online,
			number: Number,
		} = user;
		if (companion && (isUser || isCompanion)) {
			await ChatModel.update(isUser._id, {
				name,
				lastName,
				avatarUrl,
				color,
				online,
				number,
			});
			await ChatModel.update(isCompanion._id, {
				name: Name,
				lastName: LastName,
				avatarUrl: AvatarUrl,
				color: Color,
				online: Online,
				number: Number,
			});
			const updatedChat = await ChatModel.getByField(id, userId);
			return res.status(200).json({
				status: 'success',
				code: 200,
				data: updatedChat,
			});
		}

		if (companion && !isUser && !isCompanion) {
			const newChat = await ChatModel.add({
				name,
				lastName,
				avatarUrl,
				color,
				online,
				number,
				companionId: id,
				owner: userId,
			});
			await ChatModel.add({
				name: Name,
				lastName: LastName,
				avatarUrl: AvatarUrl,
				color: Color,
				online: Online,
				number: Number,
				companionId: userId,
				owner: id,
			});
			return res.status(201).json({
				status: 'success',
				code: 201,
				data: newChat,
			});
		}
	} catch (e) {
		next(e);
	}
};

module.exports = {
	listChats,
	startChat,
};