BetterDiscordApp-v1/WindowsInstaller/BetterDiscordWI/panels/Panel1.cs

using System;
using System.Diagnostics;
using System.IO;
using System.Windows.Forms;

namespace BetterDiscordWI.panels {
    public partial class Panel1: UserControl, IPanel {
        public Panel1() {
            InitializeComponent();
        }

        public void SetVisible() {

            GetParent().btnBack.Visible = true;
            GetParent().btnNext.Enabled = true;
            GetParent().btnBack.Enabled = true;
            GetParent().btnNext.Text = "Install";
            GetParent().lblPanelTitle.Text = "BetterDiscord Installation";

            pickVersion();
        }

        public FormMain GetParent() {
            return (FormMain)ParentForm;
        }

        public void BtnNext() {
            GetParent().DiscordPath = tbPath.Text;
            GetParent().RestartDiscord = cbRestart.Checked;
            GetParent().SwitchPanel(2);
        }

        public void BtnPrev() {
            GetParent().SwitchPanel(0);
        }

        private void btnBrowser_Click(object sender, EventArgs e) {
            FolderBrowserDialog fbd = new FolderBrowserDialog { SelectedPath = tbPath.Text };
            fbd.ShowDialog(GetParent());

            tbPath.Text = fbd.SelectedPath;
        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e) {
            pickVersion();
        }

        private void checkBox2_CheckedChanged(object sender, EventArgs e) {
            pickVersion();
        }

        private void pickVersion() {
            string dirPath = null;
            if(checkBox1.Checked == true) {
                dirPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) + "\\DiscordCanary";
                if(!Directory.Exists(dirPath)) checkBox1.Checked = false;
                
                checkBox2.Checked = false;
            } else if(checkBox2.Checked == true) {
                dirPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) + "\\DiscordPTB";
                if(!Directory.Exists(dirPath)) checkBox2.Checked = false;

                checkBox1.Checked = false;
            } else {
                dirPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) + "\\Discord";
            }

            if(Directory.Exists(dirPath)) {
                String[] directories = Directory.GetDirectories(dirPath);

                String highestVersion = null;

                foreach(String s in directories) {
                    Debug.Print(s);
                    if(!s.Contains("app-"))
                        continue;
                    if(String.IsNullOrEmpty(highestVersion)) {
                        highestVersion = s;
                        continue;
                    }

                    if(String.CompareOrdinal(s, highestVersion) > 0) {
                        highestVersion = s;
                    }
                }


                tbPath.Text = highestVersion;
            }
        }
    }
}