validation into the InteractiveChartResponse

Author: matteocacciola

pandasai/core/response/interactive_chart.py

@@ -9,6 +9,8 @@ class InteractiveChartResponse(BaseResponse):
     def __init__(self, value: Any, last_code_executed: str):
         super().__init__(value, "ichart", last_code_executed)
 
+        self._validate()
+
     def _get_chart(self) -> dict:
         if isinstance(self.value, dict):
             return self.value
@@ -32,3 +34,16 @@ def __str__(self) -> str:
 
     def get_dict_image(self) -> dict:
         return self._get_chart()
+
+    def _validate(self):
+        if not isinstance(self.value, (dict, str)):
+            raise ValueError("InteractiveChartResponse value must be a dict or a str representing a file path.")
+
+        # if a string, it can be a path to a file or a JSON string
+        if isinstance(self.value, str):
+            try:
+                json.loads(self.value)  # Check if it's a valid JSON string
+            except json.JSONDecodeError:
+                # If it fails, check if it's a valid file path
+                if not os.path.exists(self.value):
+                    raise ValueError("InteractiveChartResponse value must be a valid file path or a JSON string.")