ai-contract-platform/mobile/lib/features/contracts/application/contract_template_controller.dart

import 'package:flutter/foundation.dart';

import '../../../shared/network/api_client.dart';
import '../../../shared/storage/session_store.dart';
import '../domain/contract_models.dart';

class ContractTemplateController {
  ContractTemplateController({ApiClient? apiClient})
      : _apiClient = apiClient ?? const ApiClient();

  final ApiClient _apiClient;

  final ValueNotifier<bool> isLoading = ValueNotifier<bool>(false);
  final ValueNotifier<String?> errorMessage = ValueNotifier<String?>(null);
  final ValueNotifier<List<ContractTemplateItem>> items =
      ValueNotifier<List<ContractTemplateItem>>(<ContractTemplateItem>[]);

  Future<void> load({String? contractType}) async {
    final session = SessionStore.current;
    if (session == null || !session.isAuthenticated) {
      errorMessage.value = '请先登录后查看合同模板';
      return;
    }

    isLoading.value = true;
    errorMessage.value = null;
    try {
      items.value = await _apiClient.listContractTemplates(
        session.accessToken,
        contractType: contractType,
      );
    } on ApiException catch (error) {
      if (error.isUnauthorized) {
        await SessionStore.clear();
        errorMessage.value = '登录已过期，请重新登录';
      } else {
        errorMessage.value = error.message;
      }
    } catch (_) {
      errorMessage.value = '获取模板列表失败，请稍后重试';
      items.value = <ContractTemplateItem>[];
    } finally {
      isLoading.value = false;
    }
  }

  void dispose() {
    isLoading.dispose();
    errorMessage.dispose();
    items.dispose();
  }
}