package funkin.ui.debug.charting.commands;

import funkin.data.song.SongData.SongNoteData;
import funkin.data.song.SongData.SongEventData;
import funkin.data.song.SongDataUtils;

/**
 * Appends one or more items to the selection in the chart editor.
 * This does not deselect any items that are already selected, if any.
 */
@:nullSafety
@:access(funkin.ui.debug.charting.ChartEditorState)
class SelectItemsCommand implements ChartEditorCommand
{
  var notes:Array<SongNoteData>;
  var events:Array<SongEventData>;

  public function new(?notes:Array<SongNoteData>, ?events:Array<SongEventData>)
  {
    this.notes = notes ?? [];
    this.events = events ?? [];
  }

  public function execute(state:ChartEditorState):Void
  {
    for (note in this.notes)
    {
      state.currentNoteSelection.push(note);
    }

    for (event in this.events)
    {
      state.currentEventSelection.push(event);
    }

    state.noteDisplayDirty = true;
    state.notePreviewDirty = true;
  }

  public function undo(state:ChartEditorState):Void
  {
    state.currentNoteSelection = SongDataUtils.subtractNotes(state.currentNoteSelection, this.notes);
    state.currentEventSelection = SongDataUtils.subtractEvents(state.currentEventSelection, this.events);

    state.noteDisplayDirty = true;
    state.notePreviewDirty = true;
  }

  public function shouldAddToHistory(state:ChartEditorState):Bool
  {
    // This command is undoable. Add to the history if we actually performed an action.
    return (notes.length > 0 || events.length > 0);
  }

  public function toString():String
  {
    var len:Int = notes.length + events.length;

    if (notes.length == 0)
    {
      if (events.length == 1)
      {
        return 'Select Event';
      }
      else
      {
        return 'Select ${events.length} Events';
      }
    }
    else if (events.length == 0)
    {
      if (notes.length == 1)
      {
        return 'Select Note';
      }
      else
      {
        return 'Select ${notes.length} Notes';
      }
    }

    return 'Select ${len} Items';
  }
}