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

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

    // Start retrieving the artist instances to link the album to.
    var artistInstancesPromise = reqObject.artistIds && models.Artist.findAll({
        where: {
            id: {
                [Op.in]: reqObject.artistIds
            }
        }
    });

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

    // Start retrieving the album to modify.
    var albumInstancePromise = models.Album.findOne({
        where: {
            id: req.params.id
        }
    });

    // Upon finish retrieving artists and albums, modify the album.
    await Promise.all([artistInstancesPromise, tagInstancesPromise, albumInstancePromise])
        .then(async (values: any) => {
            var [artists, tags, album] = values;
            if (!album) {
                const e: EndpointError = {
                    internalMessage: 'There is no album with id ' + req.params.id + '.',
                    httpStatus: 400
                };
                throw e;
            }
            if (reqObject.artistIds) { album.setArtists(artists) };
            if (reqObject.tagIds) { album.setTags(tags) };
            if (reqObject.name) { album.name = reqObject.name };
            if (reqObject.storeLinks) { album.setStoreIds(reqObject.storeLinks) };
            await album.save();
        })
        .then(() => {
            res.status(200).send({});
        })
        .catch(catchUnhandledErrors);
}