From 90ceffdfca6d863f80adc399ed3aa6f57010ec29 Mon Sep 17 00:00:00 2001
From: "waffle.lord" <waffle.lord@hotmail.com>
Date: Thu, 21 Sep 2023 18:52:33 -0400
Subject: [PATCH] delete old files before downloaing, fix download task

---
 SPTInstaller/Helpers/DownloadCacheHelper.cs  | 8 ++++++++
 SPTInstaller/Installer Tasks/DownloadTask.cs | 9 ++++-----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/SPTInstaller/Helpers/DownloadCacheHelper.cs b/SPTInstaller/Helpers/DownloadCacheHelper.cs
index d6f8e34..a11a055 100644
--- a/SPTInstaller/Helpers/DownloadCacheHelper.cs
+++ b/SPTInstaller/Helpers/DownloadCacheHelper.cs
@@ -69,12 +69,16 @@ public static class DownloadCacheHelper
     /// <param name="targetLink">The url to download the file from</param>
     /// <param name="progress">A provider for progress updates</param>
     /// <returns>A <see cref="FileInfo"/> object of the cached file</returns>
+    /// <remarks>If the file exists, it is deleted before downloading</remarks>
     public static async Task<FileInfo?> DownloadFileAsync(string outputFileName, string targetLink, IProgress<double> progress)
     {
         var outputFile = new FileInfo(Path.Join(CachePath, outputFileName));
 
         try
         {
+            if (outputFile.Exists)
+                outputFile.Delete();
+
             // Use the provided extension method
             using (var file = new FileStream(outputFile.FullName, FileMode.Create, FileAccess.Write, FileShare.None))
                 await _httpClient.DownloadDataAsync(targetLink, file, progress);
@@ -102,12 +106,16 @@ public static class DownloadCacheHelper
     /// <param name="outputFileName">The file name to save the file as</param>
     /// <param name="downloadStream">The stream the download the file from</param>
     /// <returns>A <see cref="FileInfo"/> object of the cached file</returns>
+    /// <remarks>If the file exists, it is deleted before downloading</remarks>
     public static async Task<FileInfo?> DownloadFileAsync(string outputFileName, Stream downloadStream)
     {
         var outputFile = new FileInfo(Path.Join(CachePath, outputFileName));
 
         try
         {
+            if (outputFile.Exists)
+                outputFile.Delete();
+
             using var patcherFileStream = outputFile.Open(FileMode.Create);
             {
                 await downloadStream.CopyToAsync(patcherFileStream);
diff --git a/SPTInstaller/Installer Tasks/DownloadTask.cs b/SPTInstaller/Installer Tasks/DownloadTask.cs
index 011be57..374f44e 100644
--- a/SPTInstaller/Installer Tasks/DownloadTask.cs	
+++ b/SPTInstaller/Installer Tasks/DownloadTask.cs	
@@ -1,5 +1,4 @@
-using CG.Web.MegaApiClient;
-using Newtonsoft.Json;
+using Newtonsoft.Json;
 using SPTInstaller.Interfaces;
 using SPTInstaller.Models;
 using System.Collections.Generic;
@@ -7,7 +6,6 @@ using System.Threading.Tasks;
 using SPTInstaller.Helpers;
 using SPTInstaller.Models.Mirrors;
 using SPTInstaller.Models.Mirrors.Downloaders;
-using Microsoft.CodeAnalysis.CSharp.Syntax;
 using Serilog;
 
 namespace SPTInstaller.Installer_Tasks;
@@ -39,9 +37,10 @@ public class DownloadTask : InstallerTaskBase
         if (mirrorsList == null)
             return Result.FromError("Failed to deserialize mirrors list");
 
-
         foreach (var mirror in mirrorsList)
         {
+            _expectedPatcherHash = mirror.Hash;
+
             switch (mirror.Link)
             {
                 case string l when l.StartsWith("https://mega"):
@@ -58,7 +57,7 @@ public class DownloadTask : InstallerTaskBase
 
     private async Task<IResult> DownloadPatcherFromMirrors(IProgress<double> progress)
     {
-        SetStatus("Downloading Patcher", "Checking cache ...", progressStyle: ProgressStyle.Indeterminate);
+        SetStatus("Downloading Patcher", "Verifying cached patcher ...", progressStyle: ProgressStyle.Indeterminate);
 
         if (DownloadCacheHelper.CheckCache("patcher.zip", _expectedPatcherHash, out var cacheFile))
         {