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

module.exports = Self => {
    Self.remoteMethod('deleteTrashFiles', {
        description: 'Deletes files that have trash type',
        accessType: 'WRITE',
        returns: {
            type: 'object',
            root: true
        },
        http: {
            path: `/deleteTrashFiles`,
            verb: 'GET'
        }
    });

    Self.deleteTrashFiles = async options => {
        const tx = await Self.beginTransaction({});
        const myOptions = {};

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

        if (!myOptions.transaction)
            myOptions.transaction = tx;

        try {
            if (process.env.NODE_ENV == 'test')
                throw new UserError(`Action not allowed on the test environment`);

            const models = Self.app.models;
            const DmsContainer = models.DmsContainer;

            const trashDmsType = await models.DmsType.findOne({
                where: {code: 'trash'}
            }, myOptions);

            const date = new Date();
            date.setMonth(date.getMonth() - 4);

            const dmsToDelete = await models.Dms.find({
                where: {
                    and: [
                        {dmsTypeFk: trashDmsType.id},
                        {created: {lt: date}}
                    ]
                }
            }, myOptions);

            for (let dms of dmsToDelete) {
                const pathHash = DmsContainer.getHash(dms.id);
                const dmsContainer = await DmsContainer.container(pathHash);
                const dstFile = path.join(dmsContainer.client.root, pathHash, dms.file);
                const dstFolder = path.join(dmsContainer.client.root, pathHash);
                await fs.unlink(dstFile);
                try {
                    await fs.rmdir(dstFolder);
                    await dms.destroy(myOptions);
                } catch (err) {
                    await dms.destroy(myOptions);
                }
            }
            if (tx) await tx.commit();
        } catch (e) {
            if (tx) await tx.rollback();

            throw e;
        }
    };
};