immutable list

BatchOszExtractor.Core/BatchOszExtractor.Core.csproj

@@ -6,8 +6,4 @@
         <Nullable>enable</Nullable>
     </PropertyGroup>
 
-    <ItemGroup>
-      <ProjectReference Include="..\BatchOszExtractor.CLI\BatchOszExtractor.CLI.csproj" />
-    </ItemGroup>
-
 </Project>

BatchOszExtractor.Core/Extract.cs

@@ -1,11 +1,29 @@
-using System.ComponentModel.Design;
+using System.Collections.Immutable;
+using System.IO.Compression;
 
 namespace BatchOszExtractor.Core;
 
 public class Extract
 {
-    private void SelectMaps(SelectionType type, string MapRange)
+    public static void SelectMaps(SelectionType type, ImmutableList<string> maps, string extractPath)
     {
-        
+        // both are immutable lists of strings
+        if (type is SelectionType.Multiple or SelectionType.Single)
+        {
+            foreach (string map in maps)
+            {
+                using (ZipArchive archive = ZipFile.Open(map, ZipArchiveMode.Update))
+                {
+                    string file = Path.GetFileName(map);
+                    archive.ExtractToDirectory(Path.GetFullPath(Path.Combine(extractPath, file.Remove(file.Length - 4))));
+                }
+            }
+        }
+        // for a range of beatmaps
+        // TBD
+        else
+        {
+            
+        }
     }
 }