const {Email} = require('vn-print');
const UserError = require('vn-loopback/util/user-error');

module.exports = Self => {
    Self.remoteMethod('send', {
        description: 'Send notifications from queue',
        accessType: 'WRITE',
        returns: {
            type: 'object',
            root: true
        },
        http: {
            path: `/send`,
            verb: 'POST'
        }
    });

    Self.send = async options => {
        const models = Self.app.models;
        const findStatus = 'pending';

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

        const notificationQueue = await models.NotificationQueue.find({
            where: {status: findStatus},
            include: [
                {
                    relation: 'notification',
                    scope: {
                        include: {
                            relation: 'subscription',
                            scope: {
                                include: {
                                    relation: 'user',
                                    scope: {
                                        fields: ['name', 'email', 'lang']
                                    }
                                }
                            }
                        }
                    }

                }
            ]
        }, myOptions);

        const statusSent = 'sent';
        const statusError = 'error';

        for (const queue of notificationQueue) {
            const queueName = queue.notification().name;
            const queueParams = JSON.parse(queue.params);

            for (const notificationUser of queue.notification().subscription()) {
                try {
                    const sendParams = {
                        recipient: notificationUser.user().email,
                        lang: notificationUser.user().lang
                    };

                    if (notificationUser.userFk == queue.authorFk) {
                        await queue.updateAttribute('status', statusSent);
                        continue;
                    }

                    const newParams = Object.assign({}, queueParams, sendParams);
                    const email = new Email(queueName, newParams);

                    if (process.env.NODE_ENV != 'test')
                        await email.send();

                    await queue.updateAttribute('status', statusSent);
                } catch (error) {
                    await queue.updateAttribute('status', statusError);
                }
            }
        }
    };
};