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

module.exports = Self => {
    Self.remoteMethod('addToOrder', {
        description: 'Creates rows (lines) for a order',
        accessType: 'WRITE',
        accepts: [{
            arg: 'params',
            type: 'object',
            required: true,
            description: 'order id, [items]',
            http: {source: 'body'}
        }],
        returns: {
            type: 'object',
            root: true
        },
        http: {
            path: `/addToOrder`,
            verb: 'POST'
        }
    });

    Self.addToOrder = async(params, options) => {
        const myOptions = {};
        let tx;

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

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

        try {
            const isEditable = await Self.app.models.Order.isEditable(params.orderFk, myOptions);

            if (!isEditable)
                throw new UserError('This order is not editable');

            const promises = [];
            for (const item of params.items) {
                promises.push(
                    Self.rawSql(
                        `CALL hedera.order_addItem(?, ?, ?, ?)`,
                        [params.orderFk, item.warehouseFk, item.itemFk, item.quantity],
                        myOptions
                    )
                );
            }
            await Promise.all(promises);

            if (tx) await tx.commit();

            return true;
        } catch (e) {
            if (tx) await tx.rollback();
            throw e;
        }
    };
};