PDFEngineAPI/BlackRock.Reporting.API/Persistence/PdfGenerator.cs

using BlackRock.Reporting.API.Core;
using PuppeteerSharp;

namespace BlackRock.Reporting.API.Persistence
{
    public class PdfGenerator : IPdfGenerator
    {
        private readonly IHostEnvironment host;
        public PdfGenerator(IHostEnvironment host)
        {
            this.host = host;

        }
        public async Task Generate(string url, string path)
        {
            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);
            var options = new LaunchOptions
            {
                Headless = true
            };
            using (var browser = await Puppeteer.LaunchAsync(options))
            using (var page = await browser.NewPageAsync())
            {
                await page.GoToAsync(url, WaitUntilNavigation.DOMContentLoaded);


                var allResultsSelector = ".chartjs-render-monitor";
                await page.WaitForSelectorAsync(allResultsSelector);
                await EvaluateScript(page, "dist/main.js");
                
                await page.PdfAsync(path, new PdfOptions()
                {
                    PrintBackground = true,
                    Format = PuppeteerSharp.Media.PaperFormat.Letter,
                    Scale = 1,
                    DisplayHeaderFooter = true
                });

            }
        }
        private async Task EvaluateScript(Page page, string fileName)
        {
            string path2 = Path.Combine(host.ContentRootPath, fileName);
            var result = await System.IO.File.ReadAllTextAsync(path2);
            await page.EvaluateExpressionAsync(result);
        }
    }
}