Refactor code structure for improved readability and maintainability

dotnet/src/TwitchArchive.Core/Services/DownloaderService.cs

@@ -0,0 +1,50 @@
+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace TwitchArchive.Core.Services
+{
+    public class DownloaderService : IDownloaderService
+    {
+        private readonly IProcessRunner _runner;
+
+        public DownloaderService(IProcessRunner runner)
+        {
+            _runner = runner;
+        }
+
+        public async Task<bool> DownloadVodAsync(TwitchArchive.Core.Api.VodInfo vod, string outputPath, CancellationToken ct = default)
+        {
+            try
+            {
+                var bin = "TwitchDownloaderCLI"; // expect to be on PATH or configured elsewhere
+                Directory.CreateDirectory(Path.GetDirectoryName(outputPath) ?? ".");
+                var args = $"videodownload -u https://www.twitch.tv/videos/{(vod.Id.StartsWith("v") ? vod.Id.Substring(1) : vod.Id)} -q best -t 10 --ffmpeg-path ffmpeg --collision Rename -o \"{outputPath}\"";
+                var res = await _runner.RunAsync(new ProcessRunOptions { FileName = bin, Arguments = args, RedirectOutput = true }, ct).ConfigureAwait(false);
+                return res.ExitCode == 0;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        public async Task<bool> DownloadChatJsonAsync(string vodId, string jsonPath, CancellationToken ct = default)
+        {
+            try
+            {
+                var bin = "TwitchDownloaderCLI";
+                Directory.CreateDirectory(Path.GetDirectoryName(jsonPath) ?? ".");
+                if (vodId.StartsWith("v")) vodId = vodId.Substring(1);
+                var args = $"chatdownload --id {vodId} --embed-images --collision Rename -o \"{jsonPath}\"";
+                var res = await _runner.RunAsync(new ProcessRunOptions { FileName = bin, Arguments = args, RedirectOutput = true }, ct).ConfigureAwait(false);
+                return res.ExitCode == 0 && File.Exists(jsonPath);
+            }
+            catch
+            {
+                return false;
+            }
+        }
+    }
+}