package funkin;

import flixel.graphics.frames.FlxAtlasFrames;
import openfl.utils.AssetType;

/**
 * A core class which handles determining asset paths.
 */
class Paths
{
  static var currentLevel:Null<String> = null;

  public static function setCurrentLevel(name:Null<String>):Void
  {
    if (name == null)
    {
      currentLevel = null;
    }
    else
    {
      currentLevel = name.toLowerCase();
    }
  }

  public static function stripLibrary(path:String):String
  {
    var parts:Array<String> = path.split(':');
    if (parts.length < 2) return path;
    return parts[1];
  }

  public static function getLibrary(path:String):String
  {
    var parts:Array<String> = path.split(':');
    if (parts.length < 2) return 'preload';
    return parts[0];
  }

  static function getPath(file:String, type:AssetType, library:Null<String>):String
  {
    if (library != null) return getLibraryPath(file, library);

    if (currentLevel != null)
    {
      var levelPath:String = getLibraryPathForce(file, currentLevel);
      if (Assets.exists(levelPath, type)) return levelPath;
    }

    var levelPath:String = getLibraryPathForce(file, 'shared');
    if (Assets.exists(levelPath, type)) return levelPath;

    return getPreloadPath(file);
  }

  public static function getLibraryPath(file:String, library = 'preload'):String
  {
    return if (library == 'preload' || library == 'default') getPreloadPath(file); else getLibraryPathForce(file, library);
  }

  static inline function getLibraryPathForce(file:String, library:String):String
  {
    return '$library:assets/$library/$file';
  }

  static inline function getPreloadPath(file:String):String
  {
    return 'assets/$file';
  }

  public static function file(file:String, type:AssetType = TEXT, ?library:String):String
  {
    return getPath(file, type, library);
  }

  public static function animateAtlas(path:String, ?library:String):String
  {
    return getLibraryPath('images/$path', library);
  }

  public static function txt(key:String, ?library:String):String
  {
    return getPath('data/$key.txt', TEXT, library);
  }

  public static function frag(key:String, ?library:String):String
  {
    return getPath('shaders/$key.frag', TEXT, library);
  }

  public static function vert(key:String, ?library:String):String
  {
    return getPath('shaders/$key.vert', TEXT, library);
  }

  public static function xml(key:String, ?library:String):String
  {
    return getPath('data/$key.xml', TEXT, library);
  }

  public static function json(key:String, ?library:String):String
  {
    return getPath('data/$key.json', TEXT, library);
  }

  public static function sound(key:String, ?library:String):String
  {
    return getPath('sounds/$key.${Constants.EXT_SOUND}', SOUND, library);
  }

  public static function soundRandom(key:String, min:Int, max:Int, ?library:String):String
  {
    return sound(key + FlxG.random.int(min, max), library);
  }

  public static function music(key:String, ?library:String):String
  {
    return getPath('music/$key.${Constants.EXT_SOUND}', MUSIC, library);
  }

  public static function videos(key:String, ?library:String):String
  {
    return getPath('videos/$key.${Constants.EXT_VIDEO}', BINARY, library ?? 'videos');
  }

  public static function voices(song:String, ?suffix:String = ''):String
  {
    if (suffix == null) suffix = ''; // no suffix, for a sorta backwards compatibility with older-ish voice files

    return 'songs:assets/songs/${song.toLowerCase()}/Voices$suffix.${Constants.EXT_SOUND}';
  }

  /**
   * Gets the path to an `Inst.mp3/ogg` song instrumental from songs:assets/songs/`song`/
   * @param song name of the song to get instrumental for
   * @param suffix any suffix to add to end of song name, used for `-erect` variants usually
   * @param withExtension if it should return with the audio file extension `.mp3` or `.ogg`.
   * @return String
   */
  public static function inst(song:String, ?suffix:String = '', ?withExtension:Bool = true):String
  {
    var ext:String = withExtension ? '.${Constants.EXT_SOUND}' : '';
    return 'songs:assets/songs/${song.toLowerCase()}/Inst$suffix$ext';
  }

  public static function image(key:String, ?library:String):String
  {
    return getPath('images/$key.png', IMAGE, library);
  }

  public static function font(key:String):String
  {
    return 'assets/fonts/$key';
  }

  public static function ui(key:String, ?library:String):String
  {
    return xml('ui/$key', library);
  }

  public static function getSparrowAtlas(key:String, ?library:String):FlxAtlasFrames
  {
    return FlxAtlasFrames.fromSparrow(image(key, library), file('images/$key.xml', library));
  }

  public static function getPackerAtlas(key:String, ?library:String):FlxAtlasFrames
  {
    return FlxAtlasFrames.fromSpriteSheetPacker(image(key, library), file('images/$key.txt', library));
  }
}

enum abstract PathsFunction(String)
{
  var MUSIC;
  var INST;
  var VOICES;
  var SOUND;
}