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 tempPath = path.join('/tmp/salix-image');

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

            const timer = setInterval(async() => {
                const image = await Self.findOne({where: {error: null}});

                // Exit loop
                if (!image) return clearInterval(timer);

                const fileName = `${image.itemFk}.png`;
                const filePath = path.join(tempPath, fileName);

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

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

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

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

                writeStream.on('finish', async function() {
                    try {
                        await models.Image.registerImage('catalog', fileName, filePath);
                        await image.destroy();
                    } catch (error) {
                        await errorHandler(image.itemFk, error, filePath);
                    }
                });
            }, 2500);
        } catch (error) {
            throw new Error('Try-catch error: ', error);
        }

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

                if (!row)
                    throw new Error(`Could not update due error ${error}`);

                await row.updateAttribute('error', error);

                if (filePath && fs.existsSync(filePath))
                    await fs.unlink(filePath);
            } catch (error) {
                throw new Error('ErrorHandler error: ', error);
            }
        }
    };
};