const fs = require('fs-extra');

module.exports = Self => {
    Self.remoteMethod('download', {
        description: 'Download an invoice PDF',
        accessType: 'READ',
        accepts: [
            {
                arg: 'id',
                type: 'String',
                description: 'The invoice id',
                http: {source: 'path'}
            }
        ],
        returns: [
            {
                arg: 'body',
                type: 'file',
                root: true
            }, {
                arg: 'Content-Type',
                type: 'String',
                http: {target: 'header'}
            }, {
                arg: 'Content-Disposition',
                type: 'String',
                http: {target: 'header'}
            }
        ],
        http: {
            path: `/:id/download`,
            verb: 'GET'
        }
    });

    Self.download = async function(id) {
        let file;
        let env = process.env.NODE_ENV;
        let [invoice] = await Self.rawSql(`SELECT hedera.invoiceGetPath(?) path`, [id]);

        if (env && env != 'development') {
            file = {
                path: `/var/lib/salix/pdfs/${invoice.path}`,
                contentType: 'application/pdf',
                name: `${id}.pdf`
            };
        } else {
            file = {
                path: `${process.cwd()}/README.md`,
                contentType: 'text/plain',
                name: `README.md`
            };
        }

        await fs.access(file.path);
        let stream = fs.createReadStream(file.path);
        return [stream, file.contentType, `attachment; filename="${file.name}"`];
    };
};