import Service from '@ember/service';
import fetch from 'fetch';

export default class UtilsService extends Service {
    downloadFile(url) {
        let iframe = document.getElementById('iframeDownload');

        if (!iframe) {
            iframe = document.createElement('iframe');
            iframe.id = 'iframeDownload';
            iframe.style.display = 'none';
            document.body.append(iframe);
        }

        iframe.setAttribute('src', url);
    }

    /**
     * This method will fetch a file from the server and then download it, resolving
     * once the initial fetch is complete, allowing it to be used with loading spinners.
     *
     * @param {string} url - The URL of the file to download
     * @returns {Promise<void>}
     */
    async fetchAndDownloadFile(url) {
        const response = await fetch(url);
        const blob = await response.blob();

        const anchor = document.createElement('a');

        anchor.href = window.URL.createObjectURL(blob);
        anchor.download = /filename="(.*)"/.exec(response.headers.get('Content-Disposition'))[1];

        document.body.append(anchor);

        anchor.click();

        document.body.removeChild(anchor);
    }

    /**
     * Remove tracking parameters from a URL
     * @param {string} url
     * @param {boolean} [display] Set to true to remove protocol and hash from the URL
     * @returns
     */
    cleanTrackedUrl(url, display = false) {
        // Remove our own querystring parameters and protocol
        const removeParams = ['ref', 'attribution_id', 'attribution_type'];
        const urlObj = new URL(url);
        for (const param of removeParams) {
            urlObj.searchParams.delete(param);
        }
        if (!display) {
            return urlObj.toString();
        }
        // Return URL without protocol
        const urlWithoutProtocol = urlObj.host + (urlObj.pathname === '/' && !urlObj.search ? '' : urlObj.pathname) + (urlObj.search ? urlObj.search : '') + (urlObj.hash ? urlObj.hash : '');
        // remove www. from the start of the URL
        return urlWithoutProtocol.replace(/^www\./, '');
    }
}