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

module.exports = Self => {
    Self.remoteMethodCtx('uploadFile', {
        description: 'Uploads a file and inserts into dms model',
        accessType: 'WRITE',
        accepts: [
            {
                arg: 'options',
                type: 'object'
            }, {
                arg: 'warehouseId',
                type: 'Number',
                description: ''
            }, {
                arg: 'companyId',
                type: 'Number',
                description: ''
            }, {
                arg: 'dmsTypeId',
                type: 'Number',
                description: ''
            }, {
                arg: 'reference',
                type: 'String',
                description: ''
            }, {
                arg: 'description',
                type: 'String',
                description: ''
            }, {
                arg: 'hasFile',
                type: 'Boolean',
                description: ''
            }
        ],
        returns: {
            type: 'Object',
            root: true
        },
        http: {
            path: `/uploadFile`,
            verb: 'POST'
        }
    });

    Self.uploadFile = async(ctx, options) => {
        const models = Self.app.models;
        const storageConnector = Self.app.dataSources.storage.connector;
        const myUserId = ctx.req.accessToken.userId;
        const myWorker = await models.Worker.findOne({where: {userFk: myUserId}});
        const args = ctx.args;
        const fileOptions = {};

        let tx;
        let myOptions = {};

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

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

        try {
            const hasWriteRole = await models.DmsType.hasWriteRole(ctx, args.dmsTypeId);
            if (!hasWriteRole)
                throw new UserError(`You don't have enough privileges`);

            const uploaded = await models.Container.upload('temp', ctx.req, ctx.result, fileOptions);
            const files = Object.values(uploaded.files).map(file => {
                return file[0];
            });

            const dmsType = await models.DmsType.findById(args.dmsTypeId);
            const promises = [];

            files.forEach(file => {
                const newDms = Self.create({
                    workerFk: myWorker.id,
                    dmsTypeFk: args.dmsTypeId,
                    companyFk: args.companyId,
                    warehouseFk: args.warehouseId,
                    reference: args.reference,
                    description: args.description,
                    hasFile: args.hasFile
                }, myOptions).then(newDms => {
                    const extension = storageConnector.getFileExtension(file.name);
                    const fileName = `${newDms.id}.${extension}`;

                    return newDms.updateAttribute('file', fileName, myOptions);
                }).then(dms => {
                    return models.Container.getContainer('temp').then(container => {
                        const originPath = `${container.client.root}/${container.name}/${file.name}`;
                        const destinationPath = `${container.client.root}/${dmsType.path}/${dms.file}`;

                        return fs.rename(originPath, destinationPath).then(() => {
                            return dms;
                        });
                    });
                });

                promises.push(newDms);
            });

            const resolvedPromise = await Promise.all(promises);

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