import 'dart:io';
import 'package:flutter/services.dart';
import 'package:k3vinb5_aniyomi_bridge/jmodels/jvideo.dart';
import 'package:path_provider/path_provider.dart';
import 'package:path/path.dart' as path;
import 'package:jni/jni.dart';
import 'package:k3vinb5_aniyomi_bridge/jmodels/janiyomibridge.dart';
import 'package:k3vinb5_aniyomi_bridge/jmodels/jsanime.dart';
import 'package:k3vinb5_aniyomi_bridge/jmodels/jsepisode.dart';

class AniyomiBridge {
  
  static final _aniyomiBridgeDir = "aniyomibridge";
  static final _packageAssetsDir = "packages/k3vinb5_aniyomi_bridge/assets";
  static late final JAniyomiBridge _jAniyomiBridge;

  Future<void> initJvm() async {
    Directory supportDirectory = await getApplicationSupportDirectory();
    await _loadJarIfNeeded(supportDirectory);
    Jni.spawn(
      dylibDir: _getDylibDir(supportDirectory),
      classPath: _getClassPath(supportDirectory),
    );
    JAniyomiBridge.init();
    _jAniyomiBridge = JAniyomiBridge();
  }

  List<JSAnime> getSearchResults(String query, int page, String source) {
    JList<JObject?>? searchResults = _jAniyomiBridge.getSearchResults(JString.fromString(query), page, JString.fromString(source));
    if (searchResults == null) {
      return [];
    }
    return searchResults.cast<JObject?>().where(_jObjIsNotNull).map((jObj) => jObj!.as<JSAnime>(JSAnime.type)).toList();
  }

  List<JSEpisode> getEpisodeList(JSAnime sAnime, String source) {
    JList<JObject?>? episodeList = _jAniyomiBridge.getEpisodeList(sAnime, JString.fromString(source));
    if (episodeList == null) {
      return [];
    }
    return episodeList.cast<JObject?>().where(_jObjIsNotNull).map((jObj) => jObj!.as<JSEpisode>(JSEpisode.type)).toList();
  }

  List<JVideo> getVideoList(JSEpisode sEpisode, String source) {
    JList<JObject?>? videoList = _jAniyomiBridge.getVideoList(sEpisode, JString.fromString(source));
    if (videoList == null) {
      return [];
    }
    return videoList.cast<JObject?>().where(_jObjIsNotNull).map((jObj) => jObj!.as<JVideo>(JVideo.type)).toList();
  }

  void loadExtension(String extensionUrl) {
    _jAniyomiBridge.loadExtension(JString.fromString(extensionUrl));
  }

 List<String>? getLoadedExtensions() {
   JList<JString?>? loadedExtensions = _jAniyomiBridge.getLoadedExtensions();
   if (loadedExtensions == null) {
     return null;
   }
    return loadedExtensions.cast<JString>().map((jStr) => jStr.toDartString()).toList();
 }
 
 bool Function(JObject? jObj) get _jObjIsNotNull => (jObj) => jObj != null;

  String _getDylibDir(Directory supportDirectory) {
    String executablePath = File(Platform.resolvedExecutable).parent.path;
    if (Platform.isLinux) {
     return path.join(executablePath, "jre", "customjre", "lib", "server");
    } else if (Platform.isMacOS) {
      return path.join(executablePath, "..", "Resources", "jre", "customjre", "lib", "server");
    } else if (Platform.isWindows) {
      return path.join(executablePath, "..", "jre", "customjre", "lib", "server");
    } else {
      throw UnsupportedError("Unsupported platform");
    }
  }

  List<String> _getClassPath(Directory supportDirectory) {
    return [path.join(supportDirectory.absolute.path, _aniyomiBridgeDir, "aniyomibridge-core.jar")];
  }

  Future<void> _loadJarIfNeeded(Directory supportDirectory) async {
    String aniyomiBridgeCorePath = path.join(supportDirectory.path, _aniyomiBridgeDir, "aniyomibridge-core.jar");
    File aniyomiBridgeCore = File(aniyomiBridgeCorePath);
    if (!(await aniyomiBridgeCore.exists())) {
      print("Copying aniyomibridge-core.jar to $aniyomiBridgeCorePath");
      _copyAssetToFile("$_packageAssetsDir/aniyomibridge-core.jar", aniyomiBridgeCorePath);
    }
  }

  Future<File> _copyAssetToFile(String assetPath, String outPath) async {
    final byteData = await rootBundle.load(assetPath);
    final buffer = byteData.buffer.asUint8List();
    final file = File(outPath);
    await file.parent.create(recursive: true);
    await file.writeAsBytes(buffer, flush: true);
    return file;
  }
}