TBMM/GCMM/MainPatcher.cs

using GCMM.Properties;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO.Compression;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace GCMM
{
    partial class MainForm
    {
        public bool? CheckIfPatched()
        {
            if (!File.Exists(Settings.Default.GamePath + @"\IPA.exe"))
            {
                status.Text = "Status: Patcher missing\nClicking Play will install it";
                return null;
            }
            string nopatch = "Status: Unpatched" + (unpatched.Checked ? "" : "\nClicking Play patches it");
            if (!Directory.Exists(Settings.Default.GamePath + @"\IPA\Backups\Gamecraft"))
            {
                status.Text = nopatch;
                return false;
            }
            string backup = Directory.EnumerateDirectories(Settings.Default.GamePath + @"\IPA\Backups\Gamecraft").OrderByDescending(s => s).FirstOrDefault();
            if (backup == null)
            {
                status.Text = nopatch;
                return false;
            }
            if (File.GetLastWriteTime(Settings.Default.GamePath + @"\Gamecraft_Data\Managed\Assembly-CSharp.dll")
                > //If the file was updated at least 2 minutes after patching
                Directory.GetLastWriteTime(backup).AddMinutes(2))
            {
                status.Text = nopatch;
                return false;
            }
            status.Text = "Status: Patched" + (unpatched.Checked ? "\nClicking Play unpatches it" : "");
            return true;
        }

        public async Task PatchStartGame()
        {
            if (!BeginWork()) return;
            foreach (ListViewItem item in modlist.SelectedItems)
                item.Selected = false;
            if (!CheckIfPatched().HasValue)
            {
                if (MessageBox.Show("The patcher (GCIPA) is not found. It's necessary to load the mods. It will be downloaded from https://git.exmods.org/modtainers/GCIPA/releases and ran to patch the game. You can unpatch to run without mods at any time.", "Patcher download needed", MessageBoxButtons.OKCancel)
                    == DialogResult.Cancel)
                {
                    EndWork();
                    return;
                }
                string releases = "/api/v1/repos/modtainers/GCIPA/releases";
                string url;
                this.status.Text = "Status: Patching...";
                using (WebClient client = GetClient())
                {
                    url = JArray.Parse(await client.DownloadStringTaskAsync(releases)).First["assets"].First["browser_download_url"].ToString();
                    await client.DownloadFileTaskAsync(url, "IPA.zip");
                    ZipFile.ExtractToDirectory("IPA.zip", Settings.Default.GamePath);
                }
            }
            bool? status = CheckIfPatched();
            if (!status.HasValue) //Make sure it actually worked
            {
                EndWork(false);
                return;
            }
            if (!status.Value ^ unpatched.Checked)
            {
                var psi = new ProcessStartInfo(Settings.Default.GamePath + @"\IPA.exe", "Gamecraft.exe "
                    + (unpatched.Checked ? "--revert " : "") + "--nowait")
                {
                    UseShellExecute = false,
                    RedirectStandardError = true,
                    RedirectStandardOutput = true,
                    WorkingDirectory = Settings.Default.GamePath,
                    CreateNoWindow = true
                };
                var process = Process.Start(psi);
                process.BeginErrorReadLine();
                process.BeginOutputReadLine();
                process.EnableRaisingEvents = true;
                modinfobox.Text = "";
                DataReceivedEventHandler onoutput = (sender, e) =>
                {
                    Invoke((Action)(() => modinfobox.Text += e.Data + Environment.NewLine));
                };
                process.OutputDataReceived += onoutput;
                process.ErrorDataReceived += onoutput;
                process.Exited += CheckStartGame;
            }
            else
                CheckStartGame(null, null);
        }
    }
}