import 'dart:io';
import 'package:flutter/services.dart';
import 'package:jni/jni.dart';
import 'package:k3vinb5_aniyomi_bridge/models/extension.dart';
import 'package:path_provider/path_provider.dart';
import 'package:path/path.dart' as path;
import 'package:k3vinb5_aniyomi_bridge/jmodels/jvideo.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';
import 'package:k3vinb5_aniyomi_bridge/jmodels/jsmanga.dart';
import 'package:k3vinb5_aniyomi_bridge/jmodels/jschapter.dart';
import 'package:k3vinb5_aniyomi_bridge/jmodels/jpage.dart';

class AniyomiBridge {
  static const String _aniyomiBridgeDir = "aniyomibridge";
  static const String _aniyomiBridgeAnimeExtensionsDir = "animeExtensions";
  static const String _aniyomiBridgeMangaExtensionsDir = "mangaExtensions";
  static const String _aniyomiBridgeJarName = "aniyomibridge-core.jar";
  static const String _packageAssetsDir =
      "packages/k3vinb5_aniyomi_bridge/assets";
  static late final JAniyomiBridge _jAniyomiBridge;
  static late final String _supportDirectoryPath;
  bool _isReady = false;

  AniyomiBridge() {
    _initJvm();
  }

  Future<void> _initJvm() async {
    Directory supportDirectory = await getApplicationSupportDirectory();
    _supportDirectoryPath = supportDirectory.path;
    await _loadJarIfNeeded(supportDirectory);
    Jni.spawnIfNotExists(
      dylibDir: _getDylibDir(supportDirectory),
      classPath: _getClassPath(supportDirectory),
    );
    JAniyomiBridge.init();
    _jAniyomiBridge = JAniyomiBridge();
    _isReady = true;
  }

  bool isReady() {
    return _isReady;
  }

  List<JSAnime> getAnimeSearchResults(String query, int page, String source) {
    JList<JObject?>? searchResults = _jAniyomiBridge.getAnimeSearchResults(
      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<JSManga> getMangaSearchResults(String query, int page, String source) {
    JList<JObject?>? searchResults = _jAniyomiBridge.getMangaSearchResults(
      JString.fromString(query),
      page,
      JString.fromString(source),
    );
    if (searchResults == null) {
      return [];
    }
    return searchResults
        .cast<JObject?>()
        .where(_jObjIsNotNull)
        .map((jObj) => jObj!.as<JSManga>(JSManga.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<JSChapter> getChapterList(JSManga sManga, String source) {
    JList<JObject?>? episodeList = _jAniyomiBridge.getEpisodeList(
      sManga,
      JString.fromString(source),
    );
    if (episodeList == null) {
      return [];
    }
    return episodeList
        .cast<JObject?>()
        .where(_jObjIsNotNull)
        .map((jObj) => jObj!.as<JSChapter>(JSChapter.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();
  }

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

  void loadAnimeExtension(String extensionUrl) {
    _jAniyomiBridge.loadAnimeExtension(
      JString.fromString(extensionUrl),
      JString.fromString(
        path.join(_supportDirectoryPath, _aniyomiBridgeAnimeExtensionsDir),
      ),
    );
  }

  void unloadAnimeExtension(String extensionName, String extensionVersion) {
    _jAniyomiBridge.unloadAnimeExtension(
      JString.fromString(extensionName),
      JString.fromString(extensionVersion),
      JString.fromString(
        path.join(_supportDirectoryPath, _aniyomiBridgeAnimeExtensionsDir),
      )
    );
  }

  void loadMangaExtension(String extensionUrl) {
    _jAniyomiBridge.loadMangaExtension(
      JString.fromString(extensionUrl),
      JString.fromString(
        path.join(_supportDirectoryPath, _aniyomiBridgeMangaExtensionsDir),
      ),
    );
  }

  void unloadMangaExtension(String extensionName, String extensionVersion) {
    _jAniyomiBridge.unloadMangaExtension(
      JString.fromString(extensionName),
      JString.fromString(extensionVersion),
      JString.fromString(
        path.join(_supportDirectoryPath, _aniyomiBridgeMangaExtensionsDir),
      )
    );
  }

  Future<Set<Extension>> getInstalledAnimeExtensions() async{
    Directory animeExtDir = Directory(
      path.join(_supportDirectoryPath, _aniyomiBridgeAnimeExtensionsDir),
    );
    Set<Extension> extensions = await animeExtDir
        .list()
        .where((entityFileSystem) => entityFileSystem is File)
        .where((file) => path.extension(file.path) == ".jar")
        .map((jarFile) => path.basename(jarFile.path))
        .map(
          (jarFileName) => Extension(
            name: jarFileName.split("-")[0],
            version: jarFileName.split("-")[1],
          ),
        )
        .toSet();
    return extensions;
  }

  Future<Set<Extension>> getInstalledMangaExtensions() async{
    Directory mangaExtDir = Directory(
      path.join(_supportDirectoryPath, _aniyomiBridgeMangaExtensionsDir),
    );
    Set<Extension> extensions = await mangaExtDir
        .list()
        .where((entityFileSystem) => entityFileSystem is File)
        .where((file) => path.extension(file.path) == ".jar")
        .map((jarFile) => path.basename(jarFile.path))
        .map(
          (jarFileName) => Extension(
            name: jarFileName.split("-")[0],
            version: jarFileName.split("-")[1],
          ),
        )
        .toSet();
    return extensions;
  }

  List<String>? getLoadedAnimeExtensions() {
    JList<JString?>? loadedExtensions = _jAniyomiBridge
        .getAnimeLoadedExtensions();
    if (loadedExtensions == null) {
      return null;
    }
    return loadedExtensions
        .cast<JString>()
        .map((jStr) => jStr.toDartString())
        .toList();
  }

  List<String>? getLoadedMangaExtensions() {
    JList<JString?>? loadedExtensions = _jAniyomiBridge
        .getMangaLoadedExtensions();
    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,
        _aniyomiBridgeJarName,
      ),
    ];
  }

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