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

module.exports = Self => {
    Self.remoteMethod('downloadImages', {
        description: 'Returns last entries',
        accessType: 'WRITE',
        returns: {
            type: ['Object'],
            root: true
        },
        http: {
            path: `/downloadImages`,
            verb: 'POST'
        }
    });

    Self.downloadImages = async() => {
        const models = Self.app.models;

        try {
            const imageQueue = await Self.find({where: {error: null}});
            const tempPath = path.join('/tmp/salix-image');

            // Create temporary path
            await fs.mkdir(tempPath, {recursive: true});

            for (let image of imageQueue) {
                const fileName = `${image.itemFk}.png`;
                const filePath = path.join(tempPath, fileName);
                const file = fs.createWriteStream(filePath);

                https.get(image.url, async response => {
                    if (response.statusCode != 200) {
                        const error = new Error(`Could not download the image. Status code ${response.statusCode}`);

                        file.close();
                        await errorHandler(image.itemFk, error, filePath);
                    }

                    response.pipe(file);

                    file.on('error', async error => {
                        await errorHandler(image.itemFk, error, filePath);
                    });

                    file.on('finish', async function() {
                        try {
                            await models.Image.registerImage('catalog', fileName, filePath);
                            await image.destroy();
                        } catch (error) {
                            await errorHandler(image.itemFk, error, filePath);
                        }
                    });
                }).on('error', async error => {
                    await errorHandler(image.itemFk, error, filePath);
                });
            }

            return imageQueue;
        } catch (error) {
            await errorHandler(image.itemFk, error);
        }

        async function errorHandler(rowId, error, filePath) {
            const row = await Self.findById(rowId);
            await row.updateAttribute('error', error);

            if (filePath)
                await fs.unlink(filePath);
        }
    };
};