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

import 'package:flutter/foundation.dart';

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

class ContractLifecycleController {
  ContractLifecycleController({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<ContractLifecycleTaskListResponse?> tasks =
      ValueNotifier<ContractLifecycleTaskListResponse?>(null);

  Future<void> loadTasks({
    required String contractId,
    String? statusValue,
    String? taskType,
  }) async {
    final session = SessionStore.current;
    if (session == null || !session.isAuthenticated) {
      errorMessage.value = '请先登录';
      return;
    }

    isLoading.value = true;
    errorMessage.value = null;

    try {
      final response = await _apiClient.listContractLifecycleTasks(
        accessToken: session.accessToken,
        contractId: contractId,
        statusValue: statusValue,
        taskType: taskType,
      );
      tasks.value = response;
    } on ApiException catch (error) {
      if (error.isUnauthorized) {
        await SessionStore.clear();
      }
      errorMessage.value = error.message;
    } catch (_) {
      errorMessage.value = '获取合同任务列表失败，请稍后重试';
    } finally {
      isLoading.value = false;
    }
  }

  Future<void> updateTask({
    required String contractId,
    required String taskId,
    String? taskType,
    String? title,
    String? description,
    String? priority,
    String? statusValue,
    String? dueAt,
    String? evidenceFileId,
    String? evidenceNote,
  }) async {
    final session = SessionStore.current;
    if (session == null || !session.isAuthenticated) {
      errorMessage.value = '请先登录';
      return;
    }

    isLoading.value = true;
    errorMessage.value = null;

    try {
      await _apiClient.updateContractLifecycleTask(
        accessToken: session.accessToken,
        contractId: contractId,
        taskId: taskId,
        taskType: taskType,
        title: title,
        description: description,
        priority: priority,
        statusValue: statusValue,
        dueAt: dueAt,
        evidenceFileId: evidenceFileId,
        evidenceNote: evidenceNote,
      );
      // Fire-and-forget refresh
      _refreshTasks(contractId);
    } on ApiException catch (error) {
      errorMessage.value = error.message;
    } catch (_) {
      errorMessage.value = '更新合同任务失败，请稍后重试';
    } finally {
      isLoading.value = false;
    }
  }

  Future<void> _refreshTasks(String contractId) async {
    final session = SessionStore.current;
    if (session == null || !session.isAuthenticated) {
      return;
    }
    try {
      final response = await _apiClient.listContractLifecycleTasks(
        accessToken: session.accessToken,
        contractId: contractId,
      );
      tasks.value = response;
    } catch (_) {
      // Non-blocking refresh failure
    }
  }

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