Implement a debug menu to select difficulty/variation

source/funkin/InitState.hx

@@ -37,6 +37,7 @@ import funkin.util.macro.MacroUtil;
 import funkin.util.TrackerUtil;
 import funkin.util.WindowUtil;
 import openfl.display.BitmapData;
+import funkin.ui.debug.ChartPlaytestState;
 #if FEATURE_DISCORD_RPC
 import funkin.api.discord.DiscordClient;
 #end
@@ -388,7 +389,10 @@ class InitState extends FlxState
     }
     else if (params.song.shouldLoadSong && params.song.songPath != null)
     {
-      startSongFromFNFC(params.song.songPath);
+      FlxG.switchState(() -> new ChartPlaytestState(
+        {
+          fnfcFilePath: params.song.songPath,
+        }));
     }
     else
     {
@@ -449,15 +453,6 @@ class InitState extends FlxState
       });
   }
 
-  function startSongFromFNFC(filePath:String):Void
-  {
-    // var difficultyId = Constants.DEFAULT_DIFFICULTY;
-    // var variationId = Constants.DEFAULT_VARIATION;
-    var difficultyId = "nightmare";
-    var variationId = "erect";
-    funkin.util.file.FNFCUtil.playSongFromFNFCPath(filePath, difficultyId, variationId);
-  }
-
   /**
    * Start the game by directly loading into a specific story mode level.
    * @param levelId

source/funkin/ui/debug/ChartPlaytestState.hx

@@ -0,0 +1,107 @@
+package funkin.ui.debug;
+
+import flixel.text.FlxText;
+import flixel.tweens.FlxTween;
+import flixel.util.FlxTimer;
+import funkin.data.freeplay.player.PlayerRegistry;
+import funkin.play.ResultState.ResultsStateParams;
+import funkin.ui.MenuList.MenuTypedItem;
+import funkin.ui.MenuList.MenuTypedList;
+import funkin.ui.options.items.CheckboxPreferenceItem;
+import funkin.util.file.FNFCUtil;
+
+/**
+ * When playtesting from an FNFC file, we display a debug UI to choose a difficulty first.
+ */
+class ChartPlaytestState extends MusicBeatState
+{
+  var fnfcFilePath:String;
+
+  var currentDifficulty:String;
+  var currentVariation:String;
+
+  var items:MenuTypedList<MenuTypedItem<FlxText>>;
+
+  public function new(params:ChartPlaytestStateParams)
+  {
+    super();
+    fnfcFilePath = params.fnfcFilePath;
+    persistentUpdate = false;
+    persistentDraw = false;
+
+    items = new MenuTypedList<MenuTypedItem<FlxText>>();
+    add(items);
+
+    createItems();
+  }
+
+  function createItems():Void
+  {
+    createTextItem("Playtest Song", function() {
+      FNFCUtil.playSongFromFNFCPath(fnfcFilePath, currentDifficulty, currentVariation);
+    });
+
+    createToggleListItem("Variation", Constants.DEFAULT_VARIATION_LIST, function(value:String) {
+      currentVariation = value;
+    });
+
+    createToggleListItem("Difficulty", Constants.DEFAULT_DIFFICULTY_LIST_FULL, function(value:String) {
+      currentDifficulty = value;
+    });
+  }
+
+  function createTextItem(name:String, ?onChange:Void->Void):MenuTypedItem<FlxText>
+  {
+    var txt:FlxText = new FlxText(0, 0, name);
+    txt.antialiasing = false;
+    txt.setFormat(Paths.font('vcr.ttf'), 32);
+
+    var menuItem:MenuTypedItem<FlxText> = new MenuTypedItem<FlxText>(10, 36 * items.length, txt, name, onChange);
+    menuItem.setEmptyBackground();
+    menuItem.fireInstantly = true;
+    return items.addItem(name, menuItem);
+  }
+
+  function createCheckboxItem(name:String, ?onChange:Bool->Void):Void
+  {
+    var toggle:Bool = false;
+    var menuItem:MenuTypedItem<FlxText> = createTextItem(name);
+    menuItem.callback = function() {
+      menuItem.label.text = name + ": " + (toggle ? "on" : "off");
+      toggle = !toggle;
+      onChange(toggle);
+    };
+  }
+
+  /**
+   * Toggles between different options in a list
+   * @param name
+   * @param toggleList
+   * @param onChange
+   * @return MenuTypedItem<FlxText>
+   */
+  function createToggleListItem(name:String, toggleList:Array<String>, ?onChange:String->Void):MenuTypedItem<FlxText>
+  {
+    var toggleCounter:Int = 0;
+    var menuItem:MenuTypedItem<FlxText> = createTextItem(name);
+
+    // We create and call the labelCallback here to initalize it
+    var labelCallback:Void->Void = function() {
+      menuItem.label.text = name + ":" + toggleList[toggleCounter];
+      onChange(toggleList[toggleCounter]);
+    };
+    labelCallback();
+
+    menuItem.callback = function() {
+      toggleCounter = (toggleCounter + 1) % toggleList.length;
+      labelCallback();
+    };
+
+    return menuItem;
+  }
+}
+
+typedef ChartPlaytestStateParams =
+{
+  fnfcFilePath:Null<String>
+};

source/funkin/util/CLIUtil.hx

@@ -151,10 +151,8 @@ class CLIUtil
         },
       song:
         {
-          // shouldLoadSong: false,
-          // songPath: null
-          shouldLoadSong: true,
-          songPath: "E:/Programming/Funkin'/SECRET/Chart v0.8/milf.fnfc"
+          shouldLoadSong: false,
+          songPath: null
         }
     };
   }