import 'dart:async';
import 'dart:io';
import 'dart:isolate';
import 'dart:math';
import 'package:flutter/services.dart';
import 'package:jni/jni.dart';
import 'package:k3vinb5_aniyomi_bridge/jni_isolate.dart';
import 'package:k3vinb5_aniyomi_bridge/jni_isolate_message.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/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 consts
  static const String _aniyomiBridgeAnimeExtensionsDir = "animeExtensions";
  static const String _aniyomiBridgeMangaExtensionsDir = "mangaExtensions";
  static const String _aniyomiBridgeDir = "aniyomibridge";
  static const String _aniyomiBridgeJarName = "aniyomibridge-core.jar";
  static const String _packageAssetsDir =
      "packages/k3vinb5_aniyomi_bridge/assets";

  // static variables
  static bool _isReady = false;
  static late final JniIsolate _jniIsolate;
  static late final ReceivePort _jniReceiverPort;
  static late final SendPort _jniSenderPort;

  // instance variables
  late final String _supportDirectoryPath;
  final Random _random = Random();
  final Map<int, Completer> _pendingRequests = {};


  AniyomiBridge() {
    _initJvm();
  }

  Future<void> _initJvm() async {
    if (_isReady) {
      return;
    }
    Directory supportDirectory = await getApplicationSupportDirectory();
    _supportDirectoryPath = supportDirectory.path;
    await _loadJarIfNeeded(supportDirectory);
    Jni.setDylibDir(dylibDir: _getDylibDir(supportDirectory));

    _jniIsolate = JniIsolate();
    final readyPort = ReceivePort();
    _jniReceiverPort = ReceivePort();
    (bool, SendPort) response = await _jniIsolate.initJniIsolate(
      readyPort,
      _jniReceiverPort,
      supportDirectory,
      _getDylibDir(supportDirectory),
      _getClassPath(supportDirectory),
    );
    _isReady = response.$1;
    _jniSenderPort = response.$2;
    _jniReceiverPort.listen((message) {
      if (message is JniIsolateError) {
        final id = message.id;
        final completer = _pendingRequests.remove(id);
        if (completer == null) return;
        completer.completeError(message.error);
      } else if (message is JniIsolateResponse) {
        final id = message.id;
        final completer = _pendingRequests.remove(id);
        if (completer == null) return;
        if (message.results == null) {
          completer.complete();
          return;
        }
        completer.complete(message.results);
      }
    });
  }

  bool isReady() {
    return _isReady;
  }

  Future<List<JSAnime>> getAnimeSearchResults(String query, int page, String source) async {
    return _sendJniIsolateMessage<List<JSAnime>>(
      JniIsolateMessage(
        id: _random.nextInt(1 << 32),
        type: JniIsolateMessageType.getAnimeSearchResults,
        args: {
         'query': query,
          'page': page,
          'source': source,
        },
      ),
    );
  }

  Future<List<JSManga>> getMangaSearchResults(String query, int page, String source) async {
    return _sendJniIsolateMessage<List<JSManga>>(
      JniIsolateMessage(
        id: _random.nextInt(1 << 32),
        type: JniIsolateMessageType.getMangaSearchResults,
        args: {
          'query': query,
          'page': page,
          'source': source,
        },
      ),
    );
  }

  Future<List<JSEpisode>> getEpisodeList(JSAnime sAnime, String source) async {
    return _sendJniIsolateMessage<List<JSEpisode>>(
      JniIsolateMessage(
        id: _random.nextInt(1 << 32),
        type: JniIsolateMessageType.getEpisodeList,
        args: {
         'sAnime': sAnime,
          'source': source,
        },
      ),
    );
  }

  Future<List<JSChapter>> getChapterList(JSManga sManga, String source) async {
    return _sendJniIsolateMessage<List<JSChapter>>(
      JniIsolateMessage(
        id: _random.nextInt(1 << 32),
        type: JniIsolateMessageType.getChapterList,
        args: {
         'sManga': sManga,
          'source': source,
        },
      ),
    );
  }

  Future<List<JVideo>> getVideoList(JSEpisode sEpisode, String source) async {
    return _sendJniIsolateMessage<List<JVideo>>(
      JniIsolateMessage(
        id: _random.nextInt(1 << 32),
        type: JniIsolateMessageType.getVideoList,
        args: {
         'sEpisode': sEpisode,
          'source': source,
        },
      ),
    );
  }

  Future<List<JPage>> getPageList(JSChapter sChapter, String source) async {
    return _sendJniIsolateMessage<List<JPage>>(
      JniIsolateMessage(
        id: _random.nextInt(1 << 32),
        type: JniIsolateMessageType.getPageList,
        args: {
         'sChapter': sChapter,
          'source': source,
        },
      ),
    );
  }

  Future<void> loadAnimeExtension(String extensionUrl) async {
    return _sendJniIsolateMessage<void>(
      JniIsolateMessage(
        id: _random.nextInt(1 << 32),
        type: JniIsolateMessageType.loadAnimeExtension,
        args: {
         'extensionUrl': extensionUrl,
        },
      ),
    );
  }

  Future<void> unloadAnimeExtension(String extensionName, String extensionVersion) async {
    return _sendJniIsolateMessage<void>(
      JniIsolateMessage(
        id: _random.nextInt(1 << 32),
        type: JniIsolateMessageType.unloadAnimeExtension,
        args: {
          'extensionName': extensionName,
          'extensionVersion': extensionVersion,
        },
      ),
    );
  }

  Future<void> loadMangaExtension(String extensionUrl) async {
    return _sendJniIsolateMessage<void>(
      JniIsolateMessage(
        id: _random.nextInt(1 << 32),
        type: JniIsolateMessageType.loadMangaExtension,
        args: {
         'extensionUrl': extensionUrl,
        },
      ),
    );
  }

  Future<void> unloadMangaExtension(String extensionName, String extensionVersion) async {
    return _sendJniIsolateMessage<void>(
      JniIsolateMessage(
        id: _random.nextInt(1 << 32),
        type: JniIsolateMessageType.unloadMangaExtension,
        args: {
          'extensionName': extensionName,
          'extensionVersion': extensionVersion,
        },
      ),
    );
  }

  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();
  // }

  Future<T> _sendJniIsolateMessage<T>(JniIsolateMessage message) {
    final completer = Completer<T>();
    _pendingRequests[message.id] = completer;
    _jniSenderPort.send(message);
    return completer.future;
  }

  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;
  }
}