/* eslint-disable @typescript-eslint/no-var-requires */
/**
 * request-image-size: Detect image dimensions via request.
 * Licensed under the MIT license.
 *
 * https://github.com/FdezRomero/request-image-size
 * © 2017 Rodrigo Fernández Romero
 *
 * Based on the work of Johannes J. Schmidt
 * https://github.com/jo/http-image-size
 */

// const imageSize = require('image-size');
const HttpError = require('standard-http-error');
import * as request from 'request';
import { imageSize } from 'image-size';
import { ISizeCalculationResult } from 'image-size/dist/types/interface';

module.exports = function requestImageSize(url: string) {
    if (!url) {
        return Promise.reject(new Error('You should provide an URI string or a "request" options object.'));
    }

    return new Promise((resolve, reject) => {
        const req = request(url);

        req.on('response', res => {
            if (res.statusCode >= 400) {
                reject(new HttpError(res.statusCode, res.statusMessage));
                return;
            }

            let buffer = Buffer.from([]);
            let size: ISizeCalculationResult;

            res.on('data', chunk => {
                buffer = Buffer.concat([buffer, chunk]);
            });

            res.on('error', reject);

            res.on('end', () => {
                try {
                    size = imageSize(buffer);
                    if (size) {
                        resolve(size);
                        req.abort();
                    }
                } catch (err) {
                    /* empty */
                    console.log('Error: ', err);
                }
                if (!size) {
                    reject(new Error('Image has no size'));
                    return;
                }
                resolve(size);
            });
        });

        req.on('error', reject);
    });
};