import 'dart:async';
import 'dart:developer' as developer;

import 'package:dio/dio.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../core/network/api_response.dart';
import '../core/network/dio_client.dart';
import '../data/services/auth_service.dart';

// ── State ──────────────────────────────────────────────────

class ChangePasswordState {
  final bool isLoading;
  final bool isSendingCode;
  final String? errorMessage;
  final int codeCooldown;

  const ChangePasswordState({
    this.isLoading = false,
    this.isSendingCode = false,
    this.errorMessage,
    this.codeCooldown = 0,
  });

  ChangePasswordState copyWith({
    bool? isLoading,
    bool? isSendingCode,
    String? errorMessage,
    int? codeCooldown,
  }) =>
      ChangePasswordState(
        isLoading: isLoading ?? this.isLoading,
        isSendingCode: isSendingCode ?? this.isSendingCode,
        errorMessage: errorMessage,
        codeCooldown: codeCooldown ?? this.codeCooldown,
      );
}

// ── Notifier ───────────────────────────────────────────────

class ChangePasswordNotifier extends Notifier<ChangePasswordState> {
  AuthService get _service => AuthService(ref.read(dioClientProvider));
  Timer? _countdownTimer;

  @override
  ChangePasswordState build() {
    ref.onDispose(() => _countdownTimer?.cancel());
    return const ChangePasswordState();
  }

  void clearError() => state = state.copyWith(errorMessage: null);

  /// 发送邮箱验证码
  Future<bool> sendEmailCode() async {
    state = state.copyWith(isSendingCode: true, errorMessage: null);
    try {
      await _service.sendChangePasswordEmailCode();
      state = state.copyWith(isSendingCode: false);
      _startCountdown();
      return true;
    } catch (e) {
      state = state.copyWith(
        isSendingCode: false,
        errorMessage: _parseError(e),
      );
      return false;
    }
  }

  /// 提交修改登录密码
  Future<bool> changePassword({
    required String oldPassword,
    required String newPassword,
    required String vcode,
  }) async {
    state = state.copyWith(isLoading: true, errorMessage: null);
    try {
      await _service.changeLoginPassword(
        oldPassword: oldPassword,
        newPassword: newPassword,
        vcode: vcode,
      );
      state = state.copyWith(isLoading: false);
      return true;
    } catch (e) {
      state = state.copyWith(
        isLoading: false,
        errorMessage: _parseError(e),
      );
      return false;
    }
  }

  void _startCountdown() {
    _countdownTimer?.cancel();
    state = state.copyWith(codeCooldown: 60);
    _countdownTimer = Timer.periodic(const Duration(seconds: 1), (timer) {
      final remaining = state.codeCooldown - 1;
      state = state.copyWith(codeCooldown: remaining);
      if (remaining <= 0) {
        timer.cancel();
        _countdownTimer = null;
      }
    });
  }

  String _parseError(Object e) {
    developer.log('ChangePassword error: $e', name: 'CHANGE_PWD', error: e);
    if (e is DioException) {
      if (e.error is ApiException) return (e.error as ApiException).message;
      final responseData = e.response?.data;
      if (responseData is Map<String, dynamic>) {
        final msg = responseData['message'] as String? ??
            responseData['msg'] as String?;
        if (msg != null && msg.isNotEmpty) return msg;
      }
      return e.message ?? 'errNetworkError';
    }
    if (e is ApiException) return e.message;
    return e.toString();
  }
}

// ── Provider ──────────────────────────────────────────────

final changePasswordProvider =
    NotifierProvider<ChangePasswordNotifier, ChangePasswordState>(
  ChangePasswordNotifier.new,
);