from pydantic import BaseModel, Field, PrivateAttr # type: ignore
from typing import List
from .message import Message

class Conversation(BaseModel):
    Conversation_messages: List[Message] = Field(default=[], alias="messages")

    def __len__(self):
        return len(self.Conversation_messages)

    def __iter__(self):
        return iter(self.Conversation_messages)

    def reset(self):
       self.Conversation_messages = []

    @property
    def messages(self):
        """Return a copy of messages to prevent modification of the internal list."""
        raise AttributeError("Cannot directly get messages. Use Conversation.add() or .reset()")
    
    @messages.setter
    def messages(self, value):
        """Control how messages can be set, or prevent setting altogether."""
        raise AttributeError("Cannot directly set messages. Use Conversation.add() or .reset()")
    
    def add(self, message: Message | List[Message]) -> None:
        """Add a Message(s) to the conversation."""
        if isinstance(message, Message):
          self.Conversation_messages.append(message)
        else:
          self.Conversation_messages.extend(message)

    def get_summary(self) -> str:
        """Return a summary of the conversation."""
        if not self.Conversation_messages:
            return "Conversation is empty."
        summary = f"Conversation:\n"
        for i, message in enumerate(self.Conversation_messages, 1):
            summary += f"\nMessage {i}:\n{message.get_summary()}\n"
        return summary