import 'dart:io';

import 'package:dart_framework/platform/process.dart';
import 'package:dart_framework/utils/system_util.dart';

class RegistPath {
  static RegistPath? _instance;
  // ignore: library_private_types_in_public_api
  static RegistPath? get OS {
    if (_instance == null) {
      if (Platform.isMacOS) {
        _instance = _RegistPathOSX();
      } else if (Platform.isLinux) {
        _instance = _RegistPathLinux();
      } else {
        _instance = _RegistPathWindows();
      }
    }
    return _instance;
  }

  Future add(String path) async {
    return await _instance?.add(path);
  }

  Future remove(String path) async {
    return await _instance?.remove(path);
  }
}

/// ************* MAC ***************
class _RegistPathOSX extends RegistPath {
  String getTargetPath(String targetPath) {
    return 'export PATH=\${PATH}:$targetPath';
  }

  String get zprofile {
    var userPath = Platform.environment['HOME'];
    return '$userPath/.zprofile';
  }

  String get bprofile {
    var userPath = Platform.environment['HOME'];
    return '$userPath/.bash_profile';
  }

  @override
  Future add(String path) async {
    await addProfile(zprofile, path);
    await addProfile(bprofile, path);
    await ProcessExecutor.run(
        StringBuffer('source $zprofile && source $bprofile'));
    return simpleFuture;
  }

  Future addProfile(String profilePath, String targetPath) async {
    var file = File(profilePath);
    var contents = '';
    if (file.existsSync()) {
      contents = await file.readAsString();
    } else {
      file.createSync();
    }
    if (contents.lastIndexOf('\n') != contents.length - 1) {
      contents += '\n';
    }
    var addItem = getTargetPath(targetPath);
    if (!contents.contains(addItem)) {
      contents += addItem;
    }

    await file.writeAsString(contents, flush: true);
    return simpleFuture;
  }

  @override
  Future remove(String path) async {
    await removeProfile(zprofile, path);
    await removeProfile(bprofile, path);
    await ProcessExecutor.run(
        StringBuffer('source $zprofile && source $bprofile'));
    return simpleFuture;
  }

  Future removeProfile(String profilePath, String targetPath) async {
    var file = File(profilePath);
    var contents = '';
    if (file.existsSync()) {
      contents = await file.readAsString();
      var removeItem = getTargetPath(targetPath);
      if (contents.contains(removeItem)) {
        contents = contents.replaceAll(removeItem, '');
        await file.writeAsString(contents, flush: true);
      }
    }
    return simpleFuture;
  }
}

/// ************* LINUX ***************
class _RegistPathLinux extends RegistPath {
  @override
  Future add(String path) async {
    return null;
  }

  @override
  Future remove(String path) async {
    return null;
  }
}

/// ************* WINDOWS ***************
class _RegistPathWindows extends RegistPath {
  @override
  Future add(String path) async {
    await ProcessExecutor.run(StringBuffer('setx path "%path%;$path"'));
    return simpleFuture;
  }

  @override
  Future remove(String path) async {
    await ProcessExecutor.run(StringBuffer('setx path "%path:$path=%"'));
    return simpleFuture;
  }
}