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

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

    // Start retrieving the tag instances to link the artist to.
    var tagInstancesPromise = reqObject.tagIds && models.Tag.findAll({
        where: {
            id: {
                [Op.in]: reqObject.tagIds
            }
        }
    });

    // Upon finish retrieving artists and albums, create the artist and associate it.
    await Promise.all([tagInstancesPromise])
        .then((values: any) => {
            var [tags] = values;

            if (reqObject.tagIds && tags.length !== reqObject.tagIds.length) {
                const e: EndpointError = {
                    internalMessage: 'Not all atags exist for CreateArtist request: ' + JSON.stringify(req.body),
                    httpStatus: 400
                };
                throw e;
            }

            var artist = models.Artist.build({
                name: reqObject.name,
                storeLinks: reqObject.storeLinks || [],
            });
            tags && artist.addTags(tags);
            return artist.save();
        })
        .then((artist: any) => {
            const responseObject: api.CreateSongResponse = {
                id: artist.id
            };
            res.status(200).send(responseObject);
        })
        .catch(catchUnhandledErrors);
}