const puppeteer = require('puppeteer');
const fs = require('fs');

(async function ()
{
    try
    {
        console.log("StageRack HTML to PDF conversion tool");
        var args = process.argv.slice(2);
        let url = args[0];
        let fileDestination = args[1];
        
        if (url === undefined)
        {
            console.error("Didn't get an URL");
            process.exit(10);
        }
        console.log("    -> URL  ", url);
        
        if (fileDestination === undefined)
        {
            console.error("Didn't get a file destination");
            process.exit(11);
        }
        console.log("    -> File ", fileDestination);
        
        if (fs.existsSync(fileDestination))
        {
            console.error("[ERROR] The file \"" + fileDestination + "\" already exists");
            process.exit(12);
        }
        
        const browser = await puppeteer.launch();
        const page = await browser.newPage();
        console.log("Rendering data...")
        await page.goto(url, {waitUntil: 'networkidle0'});
        await page.emulateMediaType('screen'); // To use normal CSS instead of only print styles
        
        
        console.log("Creating the PDF document...");
        // Documentation for this function: https://pptr.dev/api/puppeteer.page
        await page.pdf(
        {
            path: fileDestination,
            format: 'A4',
            omitBackground: false,
            printBackground: true,
            preferCSSPageSize: true,
            margin: 
            {
                left: "1.27cm",
                right: "1.27cm",
                top: "1.27cm",
                bottom: "1.27cm",
            },
        });

        console.log('Conversion complete. PDF file generated successfully.');
        

        await browser.close();
    } catch (error)
    {
        console.error('An error occurred:', error);
    }
    process.exit();

})();