const UserError = require('vn-loopback/util/user-error');

module.exports = Self => {
    Self.remoteMethod('addAlias', {
        description: 'Add an alias if the user has the grant',
        accessType: 'WRITE',
        accepts: [
            {
                arg: 'ctx',
                type: 'Object',
                http: {source: 'context'}
            },
            {
                arg: 'id',
                type: 'number',
                required: true,
                description: 'The user id',
                http: {source: 'path'}
            },
            {
                arg: 'mailAlias',
                type: 'number',
                description: 'The new alias for user',
                required: true
            }
        ],
        http: {
            path: `/:id/addAlias`,
            verb: 'POST'
        }
    });

    Self.addAlias = async function(ctx, id, mailAlias, options) {
        const models = Self.app.models;
        const userId = ctx.req.accessToken.userId;

        const myOptions = {};

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

        const user = await Self.findById(userId, {fields: ['hasGrant']}, myOptions);

        if (!user.hasGrant)
            throw new UserError(`You don't have grant privilege`);

        const account = await models.Account.findById(userId, {
            fields: ['id'],
            include: {
                relation: 'aliases',
                scope: {
                    fields: ['mailAlias']
                }
            }
        }, myOptions);

        const aliases = account.aliases().map(alias => alias.mailAlias);

        const hasAlias = aliases.includes(mailAlias);
        if (!hasAlias)
            throw new UserError(`You cannot assign an alias that you are not assigned to`);

        return models.MailAliasAccount.create({
            mailAlias: mailAlias,
            account: id
        }, myOptions);
    };
};