import 'dart:io';

import 'package:cake_wallet/entities/preferences_key.dart';
import 'package:cake_wallet/generated/i18n.dart';
import 'package:cake_wallet/main.dart';
import 'package:cake_wallet/src/widgets/alert_with_two_actions.dart';
import 'package:cake_wallet/utils/show_pop_up.dart';
import 'package:device_info_plus/device_info_plus.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_mailer/flutter_mailer.dart';
import 'package:package_info/package_info.dart';
import 'package:path_provider/path_provider.dart';
import 'package:shared_preferences/shared_preferences.dart';

class ExceptionHandler {
  static bool _hasError = false;
  static const _coolDownDurationInDays = 7;

  static void _saveException(String? error, StackTrace? stackTrace, {String? library}) async {
    final appDocDir = await getApplicationDocumentsDirectory();

    final file = File('${appDocDir.path}/error.txt');
    final exception = {
      "${DateTime.now()}": {
        "Error": "$error\n\n",
        "Library": "$library\n\n",
        "StackTrace": stackTrace.toString(),
      }
    };

    const String separator = '''\n\n==========================================================
      ==========================================================\n\n''';

    /// don't save existing errors
    if (file.existsSync()) {
      final String fileContent = await file.readAsString();
      if (fileContent.contains("${exception.values.first}")) {
        return;
      }
    }

    file.writeAsStringSync(
      "$exception $separator",
      mode: FileMode.append,
    );
  }

  static void _sendExceptionFile() async {
    try {
      final appDocDir = await getApplicationDocumentsDirectory();

      final file = File('${appDocDir.path}/error.txt');

      await _addDeviceInfo(file);

      final MailOptions mailOptions = MailOptions(
        subject: 'Mobile App Issue',
        recipients: ['support@cakewallet.com'],
        attachments: [file.path],
      );

      final result = await FlutterMailer.send(mailOptions);

      // Clear file content if the error was sent or saved.
      // On android we can't know if it was sent or saved
      if (result.name == MailerResponse.sent.name ||
          result.name == MailerResponse.saved.name ||
          result.name == MailerResponse.android.name) {
        file.writeAsString("", mode: FileMode.write);
      }
    } catch (e, s) {
      _saveException(e.toString(), s);
    }
  }

  static void onError(FlutterErrorDetails errorDetails) async {
    if (kDebugMode) {
      FlutterError.presentError(errorDetails);
      debugPrint(errorDetails.toString());
      return;
    }

    if (_ignoreError(errorDetails.exception.toString())) {
      return;
    }

    _saveException(
      errorDetails.exceptionAsString(),
      errorDetails.stack,
      library: errorDetails.library,
    );

    if (errorDetails.silent) {
      return;
    }

    final sharedPrefs = await SharedPreferences.getInstance();

    final lastPopupDate =
        DateTime.tryParse(sharedPrefs.getString(PreferencesKey.lastPopupDate) ?? '') ??
            DateTime.now().subtract(Duration(days: _coolDownDurationInDays + 1));

    final durationSinceLastReport = DateTime.now().difference(lastPopupDate).inDays;

    if (_hasError || durationSinceLastReport < _coolDownDurationInDays) {
      return;
    }
    _hasError = true;

    sharedPrefs.setString(PreferencesKey.lastPopupDate, DateTime.now().toString());

    WidgetsBinding.instance.addPostFrameCallback(
      (timeStamp) async {
        await showPopUp<void>(
          context: navigatorKey.currentContext!,
          builder: (context) {
            return AlertWithTwoActions(
              isDividerExist: true,
              alertTitle: S.of(context).error,
              alertContent: S.of(context).error_dialog_content,
              rightButtonText: S.of(context).send,
              leftButtonText: S.of(context).do_not_send,
              actionRightButton: () {
                Navigator.of(context).pop();
                _sendExceptionFile();
              },
              actionLeftButton: () {
                Navigator.of(context).pop();
              },
            );
          },
        );

        _hasError = false;
      },
    );
  }

  /// Ignore User related errors or system errors
  static bool _ignoreError(String error) =>
      _ignoredErrors.any((element) => error.contains(element));

  static const List<String> _ignoredErrors = const [
    "Bad file descriptor",
    "No space left on device",
    "OS Error: Broken pipe",
    "Can't assign requested address",
    "OS Error: Socket is not connected",
    "Operation timed out",
    "No route to host",
    "Software caused connection abort",
    "Connection reset by peer",
    "Connection timed out",
    "Connection reset by peer",
    "Connection closed before full header was received",
    "Connection terminated during handshake",
    "PERMISSION_NOT_GRANTED",
    "Failed host lookup:",
    "CERTIFICATE_VERIFY_FAILED",
    "Handshake error in client",
    "Error while launching http",
    "OS Error: Network is unreachable",
  ];

  static Future<void> _addDeviceInfo(File file) async {
    final packageInfo = await PackageInfo.fromPlatform();
    final currentVersion = packageInfo.version;

    final deviceInfoPlugin = DeviceInfoPlugin();
    Map<String, dynamic> deviceInfo = {};

    if (Platform.isAndroid) {
      deviceInfo = _readAndroidBuildData(await deviceInfoPlugin.androidInfo);
      deviceInfo["Platform"] = "Android";
    } else if (Platform.isIOS) {
      deviceInfo = _readIosDeviceInfo(await deviceInfoPlugin.iosInfo);
      deviceInfo["Platform"] = "iOS";
    } else if (Platform.isLinux) {
      deviceInfo = _readLinuxDeviceInfo(await deviceInfoPlugin.linuxInfo);
      deviceInfo["Platform"] = "Linux";
    } else if (Platform.isMacOS) {
      deviceInfo = _readMacOsDeviceInfo(await deviceInfoPlugin.macOsInfo);
      deviceInfo["Platform"] = "MacOS";
    } else if (Platform.isWindows) {
      deviceInfo = _readWindowsDeviceInfo(await deviceInfoPlugin.windowsInfo);
      deviceInfo["Platform"] = "Windows";
    }

    await file.writeAsString(
      "App Version: $currentVersion\n\nDevice Info $deviceInfo\n\n",
      mode: FileMode.append,
    );
  }

  static Map<String, dynamic> _readAndroidBuildData(AndroidDeviceInfo build) {
    return <String, dynamic>{
      'brand': build.brand,
      'device': build.device,
      'manufacturer': build.manufacturer,
      'model': build.model,
      'product': build.product,
    };
  }

  static Map<String, dynamic> _readIosDeviceInfo(IosDeviceInfo data) {
    return <String, dynamic>{
      'systemName': data.systemName,
      'systemVersion': data.systemVersion,
      'model': data.model,
      'localizedModel': data.localizedModel,
      'isPhysicalDevice': data.isPhysicalDevice,
    };
  }

  static Map<String, dynamic> _readLinuxDeviceInfo(LinuxDeviceInfo data) {
    return <String, dynamic>{
      'name': data.name,
      'version': data.version,
      'versionCodename': data.versionCodename,
      'versionId': data.versionId,
      'prettyName': data.prettyName,
      'buildId': data.buildId,
      'variant': data.variant,
      'variantId': data.variantId,
    };
  }

  static Map<String, dynamic> _readMacOsDeviceInfo(MacOsDeviceInfo data) {
    return <String, dynamic>{
      'arch': data.arch,
      'model': data.model,
      'kernelVersion': data.kernelVersion,
      'osRelease': data.osRelease,
    };
  }

  static Map<String, dynamic> _readWindowsDeviceInfo(WindowsDeviceInfo data) {
    return <String, dynamic>{
      'majorVersion': data.majorVersion,
      'minorVersion': data.minorVersion,
      'buildNumber': data.buildNumber,
      'productType': data.productType,
      'productName': data.productName,
    };
  }
}