const models = require('../models');
import * as api from '../../client/src/api';
import { EndpointError, EndpointHandler, catchUnhandledErrors } from './types';

export const CreateTagEndpointHandler: EndpointHandler = async (req: any, res: any) => {
    if (!api.checkCreateTagRequest(req)) {
        const e: EndpointError = {
            internalMessage: 'Invalid CreateTag request: ' + JSON.stringify(req.body),
            httpStatus: 400
        };
        throw e;
    }
    const reqObject: api.CreateTagRequest = req.body;

    const getTag = async (id: Number) => {
        const tag = await models.Tag.findAll({
            where: {
                id: id
            }
        });
        if (tag.length != 1) {
            const e: EndpointError = {
                internalMessage: 'There is no tag with id ' + id + '.',
                httpStatus: 400
            };
            throw e;
        }
        return tag[0];
    }

    // If applicable, start retrieving the new parent tag.
    const maybeNewParentPromise: Promise<any> | Promise<undefined> =
        (reqObject.parentId) ? getTag(reqObject.parentId) : (async () => { return undefined })();

    (async () => {
        const maybeParent = await maybeNewParentPromise;
        const tag = await models.Tag.create({
            name: reqObject.name
        });
        reqObject.parentId && await tag.setParent(maybeParent);
        await tag.save();
        const responseObject: api.CreateTagResponse = {
            id: tag.id
        };
        res.status(200).send(responseObject);
    })()
        .catch(catchUnhandledErrors);
}