module.exports = Self => {
    Self.remoteMethodCtx('sendCheckingPresence', {
        description: 'Creates a message in the chat model checking the user status',
        accessType: 'WRITE',
        accepts: [{
            arg: 'workerId',
            type: 'number',
            required: true,
            description: 'The recipient user id'
        },
        {
            arg: 'message',
            type: 'string',
            required: true,
            description: 'The message'
        }],
        returns: {
            type: 'object',
            root: true
        },
        http: {
            path: `/sendCheckingPresence`,
            verb: 'POST'
        }
    });

    Self.sendCheckingPresence = async(ctx, recipientId, message, options) => {
        if (!recipientId) return false;

        let tx;
        const myOptions = {};

        if (typeof options == 'object')
            Object.assign(myOptions, options);

        if (!myOptions.transaction) {
            tx = await Self.beginTransaction({});
            myOptions.transaction = tx;
        }

        const models = Self.app.models;
        const userId = ctx.req.accessToken.userId;
        const sender = await models.Account.findById(userId);
        const recipient = await models.Account.findById(recipientId, null, myOptions);

        // Prevent sending messages to yourself
        if (recipientId == userId) return false;

        if (!recipient)
            throw new Error(`Could not send message "${message}" to worker id ${recipientId} from user ${userId}`);

        const chat = await models.Chat.create({
            senderFk: sender.id,
            recipient: `@${recipient.name}`,
            dated: Date.vnNew(),
            checkUserStatus: 1,
            message: message,
            status: 'sending',
            attempts: 0
        }, myOptions);

        try {
            await Self.sendCheckingUserStatus(chat);
            await updateChat(chat, 'sent', myOptions);
        } catch (error) {
            await updateChat(chat, 'error', error, myOptions);
        }

        if (tx) await tx.commit();

        return true;
    };

    /**
     * Update status and attempts of a chat
     *
     * @param {object} chat - The chat
     * @param {string} status - The new status
     * @param {string} error - The error
     * @param {object} options - Query options
     * @return {Promise} - The request promise
    */

    async function updateChat(chat, status, error, options) {
        return chat.updateAttributes({
            status: status,
            attempts: ++chat.attempts,
            error: error
        }, options);
    }
};