import 'package:flutter/material.dart';
import 'package:miaoji_zhang/shared/api/api_client.dart';
import 'package:miaoji_zhang/shared/services/guest_merge_service.dart';
import 'package:miaoji_zhang/shared/services/session_store.dart';
import 'package:miaoji_zhang/shared/widgets/app_controls.dart';

Future<void> offerLocalDataRecovery(
  BuildContext context, {
  Map<String, dynamic>? guestSnapshot,
}) async {
  final session = SessionStore.instance;
  Map<String, dynamic>? accountSnapshot;
  try {
    accountSnapshot = await session.pendingAccountSnapshot();
  } catch (error) {
    if (context.mounted) {
      _showMessage(context, '本机历史数据读取失败：${apiErrorMessage(error)}');
    }
  }
  if (accountSnapshot != null && context.mounted) {
    final shouldMerge = await showJzConfirmSheet(
      context,
      title: '发现本机历史数据',
      message:
          '检测到旧账号或旧后端留下的本地账单。为防止不同服务器的数据互相覆盖，这些数据已单独保留。是否导入当前账号的“本机历史数据”账本？',
      confirmLabel: '导入数据',
    );
    if (shouldMerge) {
      try {
        final result = await GuestMergeService.merge(
          accountSnapshot,
          ledgerName: '本机历史数据',
        );
        await session.clearPendingAccountSnapshot();
        if (context.mounted) {
          _showMessage(context, '已导入 ${result.transactionCount} 笔本机历史账单');
        }
      } catch (error) {
        if (context.mounted) {
          _showMessage(context, '本机历史数据暂未导入：${apiErrorMessage(error)}');
        }
      }
    }
  }

  if (guestSnapshot?['hasData'] == true && context.mounted) {
    final shouldMerge = await showJzConfirmSheet(
      context,
      title: '发现游客数据',
      message: '是否将本机游客账单、分类和预算导入当前账号？数据会放入独立的“游客数据”账本，原游客数据仍保留在本机。',
      confirmLabel: '导入数据',
    );
    if (shouldMerge) {
      try {
        final result = await GuestMergeService.merge(guestSnapshot!);
        if (context.mounted) {
          _showMessage(context, '已导入 ${result.transactionCount} 笔游客账单');
        }
      } catch (error) {
        if (context.mounted) {
          _showMessage(context, '游客数据暂未导入：${apiErrorMessage(error)}');
        }
      }
    }
  }
}

void _showMessage(BuildContext context, String message) {
  ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(message)));
}