import 'package:dio/dio.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:logging/logging.dart';
import 'package:photos/core/configuration.dart';
import 'package:photos/core/network.dart';
import 'package:photos/db/public_keys_db.dart';
import 'package:photos/models/key_attributes.dart';
import 'package:photos/models/public_key.dart';
import 'package:photos/models/subscription.dart';
import 'package:photos/services/billing_service.dart';
import 'package:photos/ui/ott_verification_page.dart';
import 'package:photos/ui/password_entry_page.dart';
import 'package:photos/ui/password_reentry_page.dart';
import 'package:photos/ui/subscription_page.dart';
import 'package:photos/utils/dialog_util.dart';
import 'package:photos/utils/toast_util.dart';

class UserService {
  final _dio = Network.instance.getDio();
  final _logger = Logger("UserAuthenticator");
  final _config = Configuration.instance;

  UserService._privateConstructor();

  static final UserService instance = UserService._privateConstructor();

  Future<void> getOtt(BuildContext context, String email) async {
    final dialog = createProgressDialog(context, "please wait...");
    await dialog.show();
    await _dio.get(
      _config.getHttpEndpoint() + "/users/ott",
      queryParameters: {
        "email": email,
      },
    ).catchError((e) async {
      _logger.severe(e);
    }).then((response) async {
      await dialog.hide();
      if (response != null) {
        if (response.statusCode == 200) {
          Navigator.of(context).push(
            MaterialPageRoute(
              builder: (BuildContext context) {
                return OTTVerificationPage();
              },
            ),
          );
        } else if (response.statusCode == 403) {
          showErrorDialog(
            context,
            "please wait...",
            "we are currently not accepting new registrations. you have been added to the waitlist and we will let you know once we are ready for you.",
          );
        }
      } else {
        showGenericErrorDialog(context);
      }
    });
  }

  Future<String> getPublicKey(String email) async {
    try {
      final response = await _dio.get(
        _config.getHttpEndpoint() + "/users/public-key",
        queryParameters: {"email": email},
        options: Options(
          headers: {
            "X-Auth-Token": _config.getToken(),
          },
        ),
      );
      final publicKey = response.data["publicKey"];
      await PublicKeysDB.instance.setKey(PublicKey(email, publicKey));
      return publicKey;
    } on DioError catch (e) {
      _logger.info(e);
      return null;
    }
  }

  Future<void> getCredentials(BuildContext context, String ott) async {
    final dialog = createProgressDialog(context, "please wait...");
    await dialog.show();
    await _dio.get(
      _config.getHttpEndpoint() + "/users/credentials",
      queryParameters: {
        "email": _config.getEmail(),
        "ott": ott,
      },
    ).catchError((e) async {
      _logger.severe(e);
    }).then((response) async {
      await dialog.hide();
      if (response != null && response.statusCode == 200) {
        await _saveConfiguration(response);
        showToast("email verification successful!");
        var page;
        if (Configuration.instance.getKeyAttributes() != null) {
          page = PasswordReentryPage();
        } else {
          page = PasswordEntryPage();
        }
        Navigator.of(context).pushAndRemoveUntil(
          MaterialPageRoute(
            builder: (BuildContext context) {
              return page;
            },
          ),
          (route) => route.isFirst,
        );
      } else {
        showErrorDialog(
            context, "oops", "verification failed, please try again");
      }
    });
  }

  Future<void> setupAttributes(BuildContext context, String password) async {
    final dialog = createProgressDialog(context, "please wait...");
    await dialog.show();
    final result = await _config.generateKey(password);
    final name = _config.getName();
    await _dio
        .put(
      _config.getHttpEndpoint() + "/users/attributes",
      data: {
        "name": name,
        "keyAttributes": result.keyAttributes.toMap(),
      },
      options: Options(
        headers: {
          "X-Auth-Token": _config.getToken(),
        },
      ),
    )
        .catchError((e) async {
      await dialog.hide();
      _logger.severe(e);
      showGenericErrorDialog(context);
    }).then((response) async {
      await dialog.hide();
      if (response != null && response.statusCode == 200) {
        await _config.setKey(result.privateKeyAttributes.key);
        await _config.setSecretKey(result.privateKeyAttributes.secretKey);
        await _config.setKeyAttributes(result.keyAttributes);
        Navigator.of(context).pushAndRemoveUntil(
          MaterialPageRoute(
            builder: (BuildContext context) {
              return SubscriptionPage();
            },
          ),
          (route) => route.isFirst,
        );
      } else {
        showGenericErrorDialog(context);
      }
    });
  }

  Future<void> _saveConfiguration(Response response) async {
    await Configuration.instance.setUserID(response.data["id"]);
    await Configuration.instance.setToken(response.data["token"]);
    final keyAttributes = response.data["keyAttributes"];
    if (keyAttributes != null) {
      await Configuration.instance
          .setKeyAttributes(KeyAttributes.fromMap(keyAttributes));
    }
    final subscription = response.data["subscription"];
    if (subscription != null) {
      await BillingService.instance
          .setSubscription(Subscription.fromMap(subscription));
    }
  }
}