add chart code

lib/services/generic_api_service.dart

@@ -11,6 +11,67 @@ class GenericApiService {
   // [修改] 移除 const COMMON_API_URL，改為方法獲取
   static const String BASE_IP = "https://api.gex.com.tw:8033";
 
+  // 修改後的動態 URL 產生器，支援傳入不同的 store procedure 與回傳 dataset 數
+  String _getProcedureUrl(String endpoint, String version) {
+    final String db = AuthManager().currentCompany ?? "demo"; //
+    final String dbAll = "eis_$db"; //
+    return "$BASE_IP/xapi/v2/$dbAll/$endpoint/$version/"; //
+  }
+
+  /// 呼叫 Store Procedure 的通用方法
+  /// [T] : 目標資料模型
+  /// [procedureEndpoint] : 端點名稱 (例如: 'sp_get_channel_sales_stats')
+  /// [version] : 版本號，預設為 "2"
+  /// [params] : 傳遞給 SP 的參數 Map
+  /// [fromJson] : 將 Map 轉換為物件的工廠方法
+  Future<List<T>> fetchProcedure<T>({
+    required String procedureEndpoint,
+    String version = "2",
+    required Map<String, String> params,
+    required T Function(Map<String, dynamic>) fromJson,
+  }) async {
+    String? token = await AuthManager.getToken();
+    if (token == null) throw Exception('未登入：找不到有效 Token');
+
+    final Map<String, String> body = {"token": token, ...params};
+    final String url = _getProcedureUrl(procedureEndpoint, version);
+
+    try {
+      final response = await http.post(
+        Uri.parse(url),
+        headers: {'Content-Type': 'application/x-www-form-urlencoded'},
+        body: body,
+      );
+
+      if (response.statusCode == 200) {
+        final Map<String, dynamic> responseData = json.decode(response.body);
+        final int code = responseData['code'] ?? responseData['Code'] ?? -1;
+
+        if (code == 0) {
+          final dynamic dataObject = responseData['data'];
+
+          if (dataObject is List) {
+            return dataObject.map((j) => fromJson(j as Map<String, dynamic>)).toList();
+          } else if (dataObject is Map<String, dynamic>) {
+            return [fromJson(dataObject)];
+          }
+          return []; // 數據格式不符回傳空清單
+        } else {
+          print("API 錯誤: ${responseData['msg'] ?? responseData['message']}");
+          return []; // Code 不為 0 回傳空清單
+        }
+      } else {
+        // [關鍵修正] statusCode 不為 200 時拋出異常或回傳空清單
+        throw Exception('HTTP 錯誤: ${response.statusCode}');
+      }
+    } catch (e) {
+      print("fetchProcedure 發生異常: $e");
+      rethrow; // 重新拋出異常讓呼叫端處理
+    }
+    // [關鍵修正] 確保函式末端一定有回傳值，解決截圖中的錯誤
+  }
+
+  // 以下是 orm_api
   String _getDynamicUrl() {
     // 從 AuthManager 獲取目前登入的公司別，若無則預設 eis_demo
     final String db = AuthManager().currentCompany ?? "demo";