import svg2pdf from 'svg2pdf.js';
import { jsPDF } from 'jspdf-yworks';
import request from 'superagent';

export const FREE_SANS_PUBLIC_URL =
    'https://frontend.cbioportal.org/common/FreeSans.json';

function base64ToArrayBuffer(base64: string) {
    const binaryString = window.atob(base64);
    const binaryLen = binaryString.length;
    const bytes = new Uint8Array(binaryLen);
    for (let i = 0; i < binaryLen; i++) {
        const ascii = binaryString.charCodeAt(i);
        bytes[i] = ascii;
    }
    return bytes;
}

export default async function svgToPdfDownload(
    fileName: string,
    svg: any,
    fontUrl: string = FREE_SANS_PUBLIC_URL
) {
    const width =
            svg.scrollWidth ||
            parseInt((svg.attributes.getNamedItem('width') as Attr).nodeValue!),
        height =
            svg.scrollHeight ||
            parseInt(
                (svg.attributes.getNamedItem('height') as Attr).nodeValue!
            );

    // create a new jsPDF instance
    let direction = 'l';
    if (height > width) {
        direction = 'p';
    }
    const pdf = new jsPDF(direction, 'pt', [width, height]);

    // we need this to provide special character support for PDF
    try {
        const fontRequest = await request.get(fontUrl);
        // override Arial with FreeSans to display special characters
        pdf.addFileToVFS('FreeSans-normal.ttf', fontRequest.body.FreeSans);
        pdf.addFont('FreeSans-normal.ttf', 'Arial', 'normal');
    } catch (ex) {
        // we just won't embed font
    } finally {
        // render the svg element
        svg2pdf(svg, pdf, {
            xOffset: 0,
            yOffset: 0,
            scale: 1,
        });
        pdf.save(fileName);
    }
}