const fs = require('fs');
const PDFParser = require("pdf2json");

function extract(fileIn, fileOut) {
    return new Promise((resolve, reject) => {
        const pdfParser = new PDFParser(this, 1);

        pdfParser.on("pdfParser_dataError", errData => reject(errData.parserError));
        pdfParser.on("pdfParser_dataReady", pdfData => {
            fs.writeFileSync(fileOut, pdfParser.getRawTextContent());
            console.log(`Extracted: ${fileOut}`);
            resolve();
        });

        pdfParser.loadPDF(fileIn);
    });
}

async function main() {
    const args = process.argv.slice(2);
    if (args.length >= 2) {
        await extract(args[0], args[1]);
    } else {
        await extract('./docs/ZF Global DESADV 1.3.9 EN Examples.pdf', './docs/zf_examples.txt');
        await extract('./docs/ZF Global DESADV 1.3.9 EN.pdf', './docs/zf_guideline.txt');
    }
}

main();