From 55bdaa921197ae6a0f45404a5223f9da6a70e643 Mon Sep 17 00:00:00 2001
From: Developer <91611@user.local>
Date: Thu, 4 Jun 2026 15:51:03 +0800
Subject: [PATCH] =?UTF-8?q?feat(programs):=20Excel=20=E5=AF=BC=E5=85=A5?=
 =?UTF-8?q?=E6=94=B9=E4=B8=BA=E5=85=A8=E9=87=8F=E8=A6=86=E7=9B=96=E6=A8=A1?=
 =?UTF-8?q?=E5=BC=8F?=
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已存在 code 的程序不再跳过，而是：
- 用 Excel 中的字段更新 program（保留 id）
- 删除该 program 的全部旧步骤
- 按 Excel 中的步骤重新写入

返回值变量名 importedCount -> processedCount 更准确。
Toast 文案同步：成功处理 / Excel 无有效数据。
---
 .../programs/pages/programs_page.dart         |  4 +-
 .../services/excel_import_service.dart        | 48 ++++++++++++++-----
 2 files changed, 39 insertions(+), 13 deletions(-)

diff --git a/lib/features/programs/pages/programs_page.dart b/lib/features/programs/pages/programs_page.dart
index 49259f2..1c070b4 100644
--- a/lib/features/programs/pages/programs_page.dart
+++ b/lib/features/programs/pages/programs_page.dart
@@ -441,9 +441,9 @@ class _ProgramsPageState extends ConsumerState<ProgramsPage> {
 
       if (!context.mounted) return;
       if (importedCount > 0) {
-        ToastService.showSuccess(context, '成功导入 $importedCount 个程序');
+        ToastService.showSuccess(context, '成功处理 $importedCount 个程序');
       } else {
-        ToastService.showWarning(context, '未导入新程序（编号可能已存在）');
+        ToastService.showWarning(context, 'Excel 中无有效程序数据');
       }
     } catch (e) {
       if (!context.mounted) return;
diff --git a/lib/features/programs/services/excel_import_service.dart b/lib/features/programs/services/excel_import_service.dart
index 577b10a..ca5419b 100644
--- a/lib/features/programs/services/excel_import_service.dart
+++ b/lib/features/programs/services/excel_import_service.dart
@@ -18,7 +18,11 @@ class ExcelImportService {
 
   ExcelImportService._internal();
 
-  /// 从 .xlsx 文件导入程序，返回成功导入的程序数量
+  /// 从 .xlsx 文件导入程序，返回成功处理的程序数量（新建 + 覆盖）
+  ///
+  /// 行为：
+  /// - code 不存在：新建程序 + 写入步骤
+  /// - code 已存在：全量覆盖程序字段，并删除旧步骤后写入新步骤
   Future<int> importFromExcel(File file) async {
     final bytes = await file.readAsBytes();
     final excel = Excel.decodeBytes(bytes);
@@ -33,9 +37,11 @@ class ExcelImportService {
       throw const ExcelImportException('Programs 表无有效数据');
     }
 
-    // 读取已有 code，避免重复
+    // 已有 code → 完整 Program（用于覆盖时取 id）
     final existing = await _programService.getAllPrograms();
-    final existingCodes = existing.map((p) => p.code).toSet();
+    final existingByCode = <String, Program>{
+      for (final p in existing) p.code: p,
+    };
 
     // 解析步骤
     final stepsSheet = _findSheet(excel, ExcelTemplateService.sheetSteps);
@@ -43,17 +49,37 @@ class ExcelImportService {
         ? <String, List<_RawStep>>{}
         : _parseSteps(stepsSheet);
 
-    int importedCount = 0;
+    int processedCount = 0;
     for (final program in programs) {
       try {
-        if (existingCodes.contains(program.code)) {
-          continue;
+        final existingProgram = existingByCode[program.code];
+        final int programId;
+        if (existingProgram == null) {
+          programId = await _programService.addProgram(program);
+        } else {
+          // 全量覆盖：保留 id，其余字段取 Excel
+          programId = existingProgram.id!;
+          await _programService.updateProgram(
+            existingProgram.copyWith(
+              name: program.name,
+              temperature: program.temperature,
+              airflowTime: program.airflowTime,
+              status: program.status,
+              createdAt: program.createdAt,
+            ),
+          );
+          // 清空旧步骤
+          final oldSteps =
+              await _programService.getStepsByProgramId(programId);
+          if (oldSteps.isNotEmpty) {
+            await _programService.deleteSteps(
+              oldSteps.map((s) => s.id!).toList(),
+            );
+          }
         }
 
-        final programId = await _programService.addProgram(program);
-
+        // 写入新步骤（按 step_no 排序后重新编号为 1..N）
         final rawSteps = stepsByCode[program.code] ?? const <_RawStep>[];
-        // 按 step_no 排序后写入
         rawSteps.sort((a, b) => a.stepNo.compareTo(b.stepNo));
         for (var i = 0; i < rawSteps.length; i++) {
           final raw = rawSteps[i];
@@ -71,14 +97,14 @@ class ExcelImportService {
           await _programService.addStep(step);
         }
 
-        importedCount++;
+        processedCount++;
       } catch (_) {
         // 单条失败不影响其他程序
         continue;
       }
     }
 
-    return importedCount;
+    return processedCount;
   }
 
   Sheet? _findSheet(Excel excel, String name) {