import 'package:flutter_bloc/flutter_bloc.dart';

import '../../../core/api/api_exception.dart';
import '../data/wallet_repository.dart';

/// خطوتا السحب (docs/38 §6): `request` يرسل رمزاً **بلا خصم**، و`confirm`
/// هو ما يخصم ويحجز. شاشة سيرو كانت خطوة واحدة — لا تُقلَّد (docs/39 §4).
enum PayoutStep { amount, code, done }

enum PayoutFailure { none, insufficient, rejected, network }

class PayoutState {
  const PayoutState({
    this.step = PayoutStep.amount,
    this.busy = false,
    this.payoutId,
    this.devCode,
    this.failure = PayoutFailure.none,
  });

  final PayoutStep step;
  final bool busy;
  final String? payoutId;

  /// يعود من الخادم في وضع التطوير وحده — يملأ الحقل لتسريع الاختبار.
  final String? devCode;

  final PayoutFailure failure;

  PayoutState copyWith({
    PayoutStep? step,
    bool? busy,
    String? payoutId,
    String? devCode,
    PayoutFailure? failure,
  }) {
    return PayoutState(
      step: step ?? this.step,
      busy: busy ?? this.busy,
      payoutId: payoutId ?? this.payoutId,
      devCode: devCode ?? this.devCode,
      failure: failure ?? this.failure,
    );
  }
}

class PayoutCubit extends Cubit<PayoutState> {
  PayoutCubit(this._repo) : super(const PayoutState());

  final WalletRepository _repo;

  Future<void> request({required num amount, required String channel}) async {
    if (amount <= 0) return;
    emit(state.copyWith(busy: true, failure: PayoutFailure.none));
    try {
      final res = await _repo.requestPayout(amount: amount, channel: channel);
      emit(state.copyWith(
        busy: false,
        step: PayoutStep.code,
        payoutId: res.payoutId,
        devCode: res.devCode,
      ));
    } on ApiException catch (e) {
      emit(state.copyWith(
        busy: false,
        failure: e.statusCode == 400
            ? PayoutFailure.insufficient
            : PayoutFailure.network,
      ));
    }
  }

  Future<void> confirm(String code) async {
    final id = state.payoutId;
    if (id == null || code.isEmpty) return;
    emit(state.copyWith(busy: true, failure: PayoutFailure.none));
    try {
      await _repo.confirmPayout(id, code);
      emit(state.copyWith(busy: false, step: PayoutStep.done));
    } on ApiException {
      // الرمز الخاطئ لا يُرجع المستخدم لخطوة المبلغ: يبقى على الرمز ويعيد
      // المحاولة — الطلب قائم على الخادم أصلاً.
      emit(state.copyWith(busy: false, failure: PayoutFailure.rejected));
    }
  }

  void reset() => emit(const PayoutState());
}