import 'package:dio/dio.dart';
import '../core/api/api_client.dart';
import '../core/device/device_id.dart';
import '../core/exceptions.dart';
import '../models/license.dart';

class LicenseRepository {
  final ApiClient _client;
  const LicenseRepository(this._client);

  Future<LicenseInfo?> getInfo() async {
    try {
      final resp = await _client.get('/license/info');
      final data = resp.data['data'];
      if (data == null) return null;
      return LicenseInfo.fromJson(data as Map<String, dynamic>);
    } on DioException catch (e) {
      throw AppException(
        e.response?.data?['error'] as String? ?? '获取授权信息失败',
        statusCode: e.response?.statusCode,
      );
    }
  }

  /// Activate a license key for this device.
  Future<void> activate(String licenseKey, {String? deviceName}) async {
    final deviceId = await DeviceId.get();
    try {
      await _client.post('/license/activate', data: {
        'license_key': licenseKey,
        'device_id': deviceId,
        'device_name': deviceName ?? DeviceId.platformName,
        'platform': DeviceId.platformName,
      });
    } on DioException catch (e) {
      throw AppException(
        e.response?.data?['error'] as String? ?? '激活失败',
        statusCode: e.response?.statusCode,
      );
    }
  }

  /// 在线购买/续费下单（仅管理员），返回 pay 收银台跳转信息。
  /// [clientType] 终端类型（"pc"/"mobile"，可选）：显式声明收银台形态——
  /// mobile 走支付宝手机网站支付（H5 拉起 App），pc 走电脑扫码页；
  /// 不传时后端按请求 UA 判断（浏览器场景 UA 真实，App 场景须显式传）。
  Future<PurchaseOrder> createPurchase(String bizCode,
      {String? clientType}) async {
    try {
      final resp = await _client.post('/license/purchase', data: {
        'biz_code': bizCode,
        if (clientType != null) 'client_type': clientType,
      });
      return PurchaseOrder.fromJson(resp.data['data'] as Map<String, dynamic>);
    } on DioException catch (e) {
      throw AppException(
        e.response?.data?['error'] as String? ?? '下单失败，请稍后重试',
        statusCode: e.response?.statusCode,
      );
    }
  }

  /// 查询购买单状态（到账轮询）。到账（paid）后返回续期后的授权到期时间。
  Future<PurchaseStatusInfo> purchaseStatus(String outTradeNo) async {
    try {
      final resp = await _client.get('/license/purchase/$outTradeNo');
      return PurchaseStatusInfo.fromJson(
          resp.data['data'] as Map<String, dynamic>);
    } on DioException catch (e) {
      throw AppException(
        e.response?.data?['error'] as String? ?? '查询订单状态失败',
        statusCode: e.response?.statusCode,
      );
    }
  }

  /// 取消一笔未支付订单（防 pending 单堆积）。仅管理员可用。
  /// 返回 true=已取消；订单不存在（404）或不可取消（409，如已支付/已取消）
  /// 视为业务性「取消不了」，返回 false 而非抛异常。
  Future<bool> cancelPurchase(String outTradeNo) async {
    try {
      final resp = await _client.post('/license/purchase/$outTradeNo/cancel');
      final data = resp.data['data'] as Map<String, dynamic>?;
      return data?['canceled'] as bool? ?? false;
    } on DioException catch (e) {
      final status = e.response?.statusCode;
      // 409 分支防御性保留：本后端实现里非 pending 单取消返回 200 +
      // canceled:false（业务性失败，非 HTTP 错误），故 409 实际永不触发；
      // 保留兜底以防后端未来改走标准 HTTP 语义时前端仍能优雅降级。
      if (status == 404 || status == 409) return false;
      throw AppException(
        e.response?.data?['error'] as String? ?? '取消订单失败，请稍后重试',
        statusCode: status,
      );
    }
  }

  /// 购买订单列表（订单管理 tab，分页 + 状态筛选）。仅管理员可用。
  Future<PurchaseListResult> listPurchases({
    int page = 1,
    int pageSize = 20,
    String? status,
  }) async {
    try {
      final resp = await _client.get('/license/purchases', params: {
        'page': page,
        'page_size': pageSize,
        if (status != null) 'status': status,
      });
      return PurchaseListResult.fromJson(
          resp.data['data'] as Map<String, dynamic>);
    } on DioException catch (e) {
      throw AppException(
        e.response?.data?['error'] as String? ?? '获取订单列表失败',
        statusCode: e.response?.statusCode,
      );
    }
  }

  /// 本店首月特惠是否已享用（购买弹窗据此置灰特惠档）。
  Future<bool> promoUsed() async {
    try {
      final resp = await _client.get('/license/promo-status');
      final data = resp.data['data'] as Map<String, dynamic>?;
      return data?['used'] as bool? ?? false;
    } on DioException {
      // 查询失败不阻塞弹窗：按未享用展示，下单时服务端仍会强校验
      return false;
    }
  }

  /// Deactivate (unbind) this device from its license.
  Future<void> deactivate() async {
    final deviceId = await DeviceId.get();
    try {
      await _client.post('/license/deactivate', data: {'device_id': deviceId});
    } on DioException catch (e) {
      throw AppException(
        e.response?.data?['error'] as String? ?? '解绑失败',
        statusCode: e.response?.statusCode,
      );
    }
  }
}