import 'dart:async';
import 'dart:io';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:umeng_verify_sdk/umeng_verify_sdk.dart';

import '../../../common/config/app_h5_urls.dart';
import '../../../common/tracking/umeng_service.dart';

enum OneKeyLoginOutcome { success, fallback, cancelled, unsupported, busy }

/// Runs only after an explicit user login action.  Do not add an availability
/// probe or `accelerateLoginPage` outside this class: Xiaomi rejects that as
/// background carrier-auth prefetch.
class OneKeyLoginService {
  Future<OneKeyLoginOutcome>? _operation;
  bool _authPageOpened = false;
  bool _terminal = false;
  Timer? _resumeCancellation;
  void Function(OneKeyLoginOutcome)? _completeCurrent;

  Future<OneKeyLoginOutcome> start({
    required BuildContext context,
    required Future<void> Function(String token) verifyToken,
    VoidCallback? onNativeRequestDispatched,
    VoidCallback? onAuthPageOpened,
  }) {
    if (_operation != null) return Future.value(OneKeyLoginOutcome.busy);
    _terminal = false;
    _authPageOpened = false;
    final operation = _start(
      context: context,
      verifyToken: verifyToken,
      onNativeRequestDispatched: onNativeRequestDispatched,
      onAuthPageOpened: onAuthPageOpened,
    );
    _operation = operation;
    return operation.whenComplete(() {
      _operation = null;
      _completeCurrent = null;
    });
  }

  Future<OneKeyLoginOutcome> _start({
    required BuildContext context,
    required Future<void> Function(String token) verifyToken,
    VoidCallback? onNativeRequestDispatched,
    VoidCallback? onAuthPageOpened,
  }) async {
    if (kIsWeb || (!Platform.isAndroid && !Platform.isIOS)) {
      return OneKeyLoginOutcome.unsupported;
    }
    final uiConfig = _uiConfig(context);
    await UmengService.initOneKeyLoginIfAllowed();
    final completer = Completer<OneKeyLoginOutcome>();

    void complete(OneKeyLoginOutcome outcome) {
      if (_terminal) return;
      _terminal = true;
      _resumeCancellation?.cancel();
      _resumeCancellation = null;
      _clearCallbacks();
      completer.complete(outcome);
    }

    _completeCurrent = complete;

    void handleUiResult(Object? result) {
      final code = _code(result);
      if (code == '700000') complete(OneKeyLoginOutcome.cancelled);
      if (code == '700001') complete(OneKeyLoginOutcome.fallback);
    }

    void handleTokenResult(Object? result) {
      final code = _code(result);
      // iOS 700002 is only the native button click; token follows later.
      if (Platform.isIOS && code == '700002') return;
      // 600024 is Android environment availability, not a login result.
      if (code == '600024') return;
      if (code == '600001') {
        if (!_authPageOpened) {
          _authPageOpened = true;
          onAuthPageOpened?.call();
        }
        return;
      }
      if (code == '700000') {
        complete(OneKeyLoginOutcome.cancelled);
        return;
      }
      if (code == '700001') {
        complete(OneKeyLoginOutcome.fallback);
        return;
      }
      if (code != '600000' || result is! Map) {
        complete(OneKeyLoginOutcome.fallback);
        return;
      }
      final token = result['token']?.toString();
      if (token == null || token.isEmpty) {
        complete(OneKeyLoginOutcome.fallback);
        return;
      }
      unawaited(() async {
        try {
          await verifyToken(token);
          complete(OneKeyLoginOutcome.success);
        } catch (_) {
          complete(OneKeyLoginOutcome.fallback);
        } finally {
          _closeNativePage();
        }
      }());
    }

    if (Platform.isIOS) {
      UmengVerifySdk.getLoginTokenCallback(handleTokenResult);
      UmengVerifySdk.getWidgetEventCallback((_) {});
    } else {
      UmengVerifySdk.setTokenResultCallback_android(handleTokenResult);
      UmengVerifySdk.setUIClickCallback_android(handleUiResult);
    }
    try {
      final request = UmengVerifySdk.getLoginTokenWithTimeout(3, uiConfig);
      onNativeRequestDispatched?.call();
      unawaited(
        request.catchError((Object _) {
          complete(OneKeyLoginOutcome.unsupported);
        }),
      );
      return await completer.future.timeout(
        const Duration(seconds: 20),
        onTimeout: () => OneKeyLoginOutcome.fallback,
      );
    } finally {
      _clearCallbacks();
    }
  }

  void onAppResumed() {
    if (!Platform.isAndroid ||
        !_authPageOpened ||
        _terminal ||
        _resumeCancellation != null) {
      return;
    }
    _resumeCancellation = Timer(const Duration(milliseconds: 500), () {
      _resumeCancellation = null;
      if (_terminal) return;
      _completeCurrent?.call(OneKeyLoginOutcome.cancelled);
      _closeNativePage();
    });
  }

  UMCustomModel _uiConfig(BuildContext context) {
    const ink = Color(0xFF202124);
    const muted = Color(0xFF8A8F98);
    const background = Color(0xFFFFFFFF);
    final model = UMCustomModel()
      ..logoIsHidden = true
      ..numberColor = ink.toARGB32()
      ..numberFont = 30
      ..navTitle = ['', Colors.transparent.toARGB32(), 0]
      ..navColor = background.toARGB32()
      ..backgroundColor_ios = background.toARGB32()
      ..sloganText = ['', background.toARGB32(), 0]
      ..privacyPreText = '我已阅读并同意'
      ..privacyOne = ['《隐私政策》', AppH5Urls.privacyUrl]
      ..privacyTwo = ['《用户协议》', AppH5Urls.userProtocolUrl]
      ..privacyColors = [muted.toARGB32(), ink.toARGB32()]
      ..changeBtnTitle = ['其他手机号登录', ink.toARGB32(), 16]
      ..loginBtnText = ['本机号码一键登录', Colors.white.toARGB32(), 16]
      ..privacyFont = 12
      ..checkBoxIsChecked = false;
    if (Platform.isAndroid) {
      model.numberFrame = [-1, 156, -1, -1];
      model.loginBtnFrame = [-1, 283, -1, -1, 52];
      model.changeBtnFrame = [368, -1, -1, -1];
      model.privacyFrame = [-1, 427, -1, -1];
    } else {
      final title = UMCustomWidget('title', UMCustomWidgetType.textView)
        ..title = '金值'
        ..titleFont = 26
        ..titleColor = ink.toARGB32()
        ..width = MediaQuery.sizeOf(context).width.toInt()
        ..height = 54
        ..top = 26
        ..textAlignment = UMCustomWidgetTextAlignmentType.center
        ..isClickEnable = false
        ..rootViewId = UMRootViewId.body;
      model.customWidget = [title.toJsonMap()];
      model.privacyFont = 13;
      model.checkBoxWH = 20;
      model.checkBoxIsChecked = true;
    }
    return model;
  }

  String _code(Object? result) => result is Map
      ? (result['code'] ?? result['resultCode'] ?? '').toString()
      : '';

  void _clearCallbacks() {
    UmengVerifySdk.getLoginTokenCallback(null);
    UmengVerifySdk.getWidgetEventCallback(null);
    UmengVerifySdk.setTokenResultCallback_android(null);
    UmengVerifySdk.setUIClickCallback_android(null);
  }

  void _closeNativePage() {
    if (Platform.isIOS) {
      unawaited(UmengVerifySdk.cancelLoginVCAnimated(true));
    } else {
      UmengVerifySdk.quitLoginPage_android();
    }
  }
}