import 'dart:convert';

import 'package:dio/dio.dart';
import 'package:flutter/cupertino.dart';
import 'package:provider/provider.dart';
import 'package:qpay/abstracts/AbstractController.dart';
import 'package:qpay/http/http.dart';
import 'package:qpay/models/api_response.dart';
import 'package:qpay/screens/onboarding/onboarding_controller.dart';

class VerifyModel {
  String? code;
  bool isLoading = false;
  String? errorMessage;
  String? status = 'failed';
}

class VerifyController extends AbstractController {
  late OnboardingController onboardingController;
  final Http http = Http();
  BuildContext context;

  VerifyModel model = VerifyModel();

  VerifyController(this.context) {
    onboardingController = Provider.of<OnboardingController>(
      context,
      listen: false,
    );
  }

  void updateCode(String code) {
    model.code = code;
    notifyListeners();
  }

  /// Extracts a human-readable error message from any exception thrown during
  /// an HTTP call. Supports:
  ///  * [DioException] – the response body, request body, and a top-level
  ///    `message` field are inspected.
  ///  * Dart [Exception] / [Error] whose stringified form is a JSON object
  ///    (e.g. `{state: failed, status: manual, body: {...}, message: ...}`).
  ///  * Any other throwable – falls back to its `toString()`.
  String _extractErrorMessage(Object error) {
    try {
      if (error is DioException) {
        final data = error.response?.data;
        if (data is Map) {
          final message = data['message'];
          if (message is String && message.isNotEmpty) return message;
        }
        if (data is String && data.isNotEmpty) {
          final parsed = _tryParseJson(data);
          if (parsed is Map) {
            final message = parsed['message'];
            if (message is String && message.isNotEmpty) return message;
          }
          return data;
        }
        if (error.type == DioExceptionType.connectionTimeout ||
            error.type == DioExceptionType.receiveTimeout ||
            error.type == DioExceptionType.sendTimeout) {
          return 'The request timed out. Please check your connection and try again.';
        }
        if (error.type == DioExceptionType.connectionError) {
          return 'No internet connection. Please check your network and try again.';
        }
        return error.message ?? 'Network error. Please try again.';
      }

      final raw = error.toString();
      // The server sometimes throws a stringified JSON object as an exception.
      final parsed = _tryParseJson(raw);
      if (parsed is Map) {
        final message = parsed['message'];
        if (message is String && message.isNotEmpty) return message;
      }
      return raw;
    } catch (_) {
      return 'An unexpected error occurred. Please try again.';
    }
  }

  dynamic _tryParseJson(String input) {
    try {
      return jsonDecode(input);
    } catch (_) {
      return null;
    }
  }

  Future<ApiResponse<Map<String, dynamic>>> verifyOtp() async {
    Map user = {
      "username": onboardingController.model.email,
      "otpCode": model.code,
      "otpType": "REGISTRATION",
      "workflowId": onboardingController.model.workflowId,
    };

    try {
      model.isLoading = true;
      model.errorMessage = null;
      notifyListeners();

      Map response = await http.post('/auth/verify', user);
      model.status = response['state'];
      model.isLoading = false;
      notifyListeners();

      if (response['state'] == 'failed') {
        final message =
            response['message']?.toString() ?? "Verification failed";
        model.errorMessage = message;
        return ApiResponse.failure(message);
      }
      return ApiResponse.success(Map<String, dynamic>.from(response));
    } catch (e) {
      logger.e(e);
      final message = _extractErrorMessage(e);
      model.errorMessage = message;
      model.isLoading = false;
      notifyListeners();
      return ApiResponse.failure(message);
    }
  }

  Future<ApiResponse<Map<String, dynamic>>> resendOtp() async {
    Map user = {
      "username": onboardingController.model.email,
      "phone": onboardingController.model.phone,
      "workflowId": onboardingController.model.workflowId,
    };

    try {
      model.isLoading = true;
      model.errorMessage = null;
      notifyListeners();

      Map response = await http.post('/auth/resend', user);
      model.status = response['state'];
      model.isLoading = false;
      notifyListeners();

      if (response['state'] == 'failed') {
        final message = response['message']?.toString() ?? "Resend failed";
        model.errorMessage = message;
        return ApiResponse.failure(message);
      }
      return ApiResponse.success(Map<String, dynamic>.from(response));
    } catch (e) {
      logger.e(e);
      final message = _extractErrorMessage(e);
      model.errorMessage = message;
      model.isLoading = false;
      notifyListeners();
      return ApiResponse.failure(message);
    }
  }
}