using PuppeteerSharp;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace PuppeteerSharpTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private async void btnScrape_Click(object sender, EventArgs e)
        {
			var result = await LoadXXXAsync();

		}

		private async Task<DtoEst> LoadXXXAsync()
		{
			// downloads chromium to the local project, needed by Puppeteer Sharp for execution, takes about 2 min!
			await new BrowserFetcher().DownloadAsync();
			// await new BrowserFetcher().DownloadAsync(DefaultChromiumRevision);

			DtoEst dto = new DtoEst();
			//var url = "https://www.xxxxxx.xhtml";
			var url = "https://www.bmf-steuerrechner.de/ekst/eingabeformekst.xhtml";

			#region SELECTORS
			// https://stackoverflow.com/questions/45110893/select-elements-by-attributes-with-colon
			// use css escapes: https://mothereff.in/css-escapes
			string id_checkbox_IsMarried = "bmf_form_ekst:ekst_pv:0";
			string id_input_Umsatz = "bmf_form_ekst:ekst_zve";
			string id_button_Submit2 = @"#bmf_form_ekst\3A income_ekst";
			string NettoUmsatz = txtNettoUmsatz.Text;
			#endregion

			//// This statement downloads and installs chromium
			//await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);
			var browser = await Puppeteer.LaunchAsync(new LaunchOptions
			{
				Headless = true
			});

			using (var page = await browser.NewPageAsync())
			{
				// load page
				await page.GoToAsync(url);
				// wait for element to be there
				await page.WaitForExpressionAsync($"document.getElementById('{id_input_Umsatz}')!=null");
				await page.EvaluateExpressionAsync($"document.getElementById('{id_input_Umsatz}').value = '{NettoUmsatz}';");
				// get element value
				var val = await page.EvaluateFunctionAsync<string>($"()=>document.getElementById('{id_input_Umsatz}').value");
				// wait for element to be there
				await page.WaitForExpressionAsync($"document.getElementById('{id_checkbox_IsMarried}')!=null");
				await page.EvaluateExpressionAsync($"document.getElementById('{id_checkbox_IsMarried}').checked = false;");

				await page.ClickAsync(id_button_Submit2);
				// wait for redirect
				await page.WaitForNavigationAsync();
				// get value from element
				var strValueEst = await page.EvaluateFunctionAsync<string>("()=>document.querySelector('#ui-id-4 > div.ekst_ergebnis > div:nth-child(6) > table > tbody > tr:nth-child(3) > td:nth-child(2) > strong').textContent");
				// get value from element
				var strValueEstPercent = await page.EvaluateFunctionAsync<string>("()=>document.querySelector('#ui-id-4 > div.ekst_ergebnis > div:nth-child(6) > table > tbody > tr:nth-child(3) > td:nth-child(3) > strong').textContent");

				var deDE = new CultureInfo("de-DE");

				Decimal.TryParse(strValueEst.TrimEnd(" Euro".ToCharArray()), NumberStyles.AllowThousands | NumberStyles.AllowDecimalPoint, deDE, out var decValueEst);
				Decimal.TryParse(strValueEstPercent.TrimEnd(" %".ToCharArray()), NumberStyles.AllowThousands | NumberStyles.AllowDecimalPoint, deDE, out var decValueEstPercent);

				dto.EstBetrag = decValueEst;
				dto.EstProzentsatz = decValueEstPercent;
			}

			return await Task.FromResult(dto);
		}
	}
}