feat(message): add format_message method to Message class

Author: jinliyl

flowllm/core/schema/message.py

@@ -95,6 +95,38 @@ def simple_dump(self, add_reasoning: bool = True) -> dict:
 
         return result
 
+    def format_message(
+            self,
+            i: int | None = None,
+            add_time_created: bool = False,
+            use_name_first: bool = False,
+            add_reasoning_content: bool = True,
+            add_tool_calls: bool = True
+    ) -> str:
+        content = ""
+        if i is not None:
+            content += f"round{i} "
+
+        if add_time_created:
+            content += f"[{self.time_created}] "
+
+        if use_name_first:
+            content += f"{self.name or self.role.value}:\n"
+        else:
+            content += f"{self.role.value}:\n"
+
+        if add_reasoning_content and self.reasoning_content:
+            content += self.reasoning_content + "\n"
+
+        if self.content:
+            content += self.content + "\n"
+
+        if add_tool_calls and self.tool_calls:
+            for tool_call in self.tool_calls:
+                content += f" - tool_call={tool_call.name} params={tool_call.arguments}\n"
+
+        return content.strip()
+
 
 class Trajectory(BaseModel):
     """Represents a conversation trajectory with messages and optional scoring."""