import 'dart:convert';
import 'dart:typed_data';

import 'package:dio/dio.dart';
import 'package:patbond_flutter/features/auth/auth_models.dart';
import 'package:patbond_flutter/features/auth/auth_repository.dart';
import 'package:patbond_flutter/features/auth/session_manager.dart';

/// 测试用内存 token 存储。
class InMemoryTokenStore implements TokenStore {
  final Map<String, String> values = {};

  @override
  Future<String?> read(String key) async => values[key];

  @override
  Future<void> write(String key, String value) async => values[key] = value;

  @override
  Future<void> delete(String key) async => values.remove(key);
}

/// 测试用假认证仓库：各方法可注入行为，默认成功空实现。
class FakeAuthRepository implements AuthRepository {
  FakeAuthRepository({
    this.loginHandler,
    this.registerHandler,
    this.restoreHandler,
    this.meHandler,
    this.updateMeHandler,
  });

  final Future<void> Function()? loginHandler;
  final Future<void> Function()? registerHandler;
  final Future<SessionRestoreResult> Function()? restoreHandler;
  final Future<UserProfile> Function()? meHandler;
  final Future<UserProfile> Function(UpdateMeRequest)? updateMeHandler;

  int loginCalls = 0;
  int registerCalls = 0;
  int logoutCalls = 0;
  int meCalls = 0;

  /// 收到的 PATCH 载荷（三态断言用：**未改字段不应出现在 map 里**）。
  final List<Map<String, Object?>> updateMePayloads = [];

  @override
  Future<void> login({required String username, required String password}) {
    loginCalls += 1;
    return loginHandler?.call() ?? Future.value();
  }

  @override
  Future<void> register({
    required String username,
    required String phone,
    required String password,
  }) {
    registerCalls += 1;
    return registerHandler?.call() ?? Future.value();
  }

  @override
  Future<void> logout() async {
    logoutCalls += 1;
  }

  @override
  Future<SessionRestoreResult> restoreSession() {
    return restoreHandler?.call() ??
        Future.value(SessionRestoreResult.noSession);
  }

  @override
  Future<UserProfile> me() async {
    meCalls += 1;
    // 缺省给一个「无昵称无头像」的样本（回退到 username 的形态）：
    // 主壳级测试不必逐个注入。
    return meHandler?.call() ?? Future.value(buildProfile());
  }

  @override
  Future<UserProfile> updateMe(UpdateMeRequest request) async {
    updateMePayloads.add(request.toJson());
    if (updateMeHandler == null) throw UnimplementedError();
    return updateMeHandler!(request);
  }
}

/// `/me` 响应样本（契约 v1.4.0 六字段全字段）。
Map<String, dynamic> sampleMeJson({
  String userId = 'user-1',
  String username = 'llx',
  String? nickname,
  String? avatarUrl,
  String? phone = '+8613800138000',
}) => {
  'userId': userId,
  'username': username,
  'nickname': nickname,
  'avatarUrl': avatarUrl,
  'phone': phone,
  'createdAt': '2026-09-01T10:00:00+08:00',
};

UserProfile buildProfile({
  String userId = 'user-1',
  String username = 'llx',
  String? nickname,
  String? avatarUrl,
}) => UserProfile.fromJson(
  sampleMeJson(
    userId: userId,
    username: username,
    nickname: nickname,
    avatarUrl: avatarUrl,
  ),
);

/// mock dio：用假 HttpClientAdapter 返回预设响应并记录请求。
class FakeHttpAdapter implements HttpClientAdapter {
  FakeHttpAdapter(this.handler);

  final Future<ResponseBody> Function(RequestOptions options) handler;
  final List<RequestOptions> requests = [];

  @override
  Future<ResponseBody> fetch(
    RequestOptions options,
    Stream<Uint8List>? requestStream,
    Future<void>? cancelFuture,
  ) {
    requests.add(options);
    return handler(options);
  }

  @override
  void close({bool force = false}) {}
}

ResponseBody jsonResponse(int statusCode, Map<String, Object?> body) {
  return ResponseBody.fromString(
    jsonEncode(body),
    statusCode,
    headers: {
      Headers.contentTypeHeader: [Headers.jsonContentType],
    },
  );
}

Map<String, Object?> okEnvelope(Map<String, Object?> data) => {
  'code': 0,
  'message': 'ok',
  'data': data,
};

Map<String, Object?> errorEnvelope(int code, [String message = 'error']) => {
  'code': code,
  'message': message,
  'data': null,
};

Map<String, dynamic> tokenDataJson({
  String access = 'access-1',
  String refresh = 'refresh-1',
}) => {
  'userId': 'user-1',
  'tokenType': 'Bearer',
  'accessToken': access,
  'accessTokenExpiresAt': '2026-09-04T13:00:00+08:00',
  'refreshToken': refresh,
  'refreshTokenExpiresAt': '2026-10-04T12:00:00+08:00',
};

AuthTokens sampleTokens({
  String access = 'access-0',
  String refresh = 'refresh-0',
}) => AuthTokens.fromJson(tokenDataJson(access: access, refresh: refresh));