#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
@Time    : 2023/5/20 12:15
@Author  : alexanderwu
@File    : memory.py
@Modified By: mashenquan, 2023-11-1. According to RFC 116: Updated the type of index key.
"""
from collections import defaultdict
from typing import DefaultDict, Iterable, Set

from pydantic import BaseModel, Field, SerializeAsAny


from mora.messages import Message



class Memory(BaseModel):
    """The most basic memory: super-memory"""

    storage: list[SerializeAsAny[Message]] = []
    index: DefaultDict[str, list[SerializeAsAny[Message]]] = Field(default_factory=lambda: defaultdict(list))
    ignore_id: bool = False

    def add(self, message: Message):
        """Add a new message to storage, while updating the index"""

        if message in self.storage:
            return
        self.storage.append(message)
        if message.cause_by:
            self.index[message.cause_by].append(message)

    def add_batch(self, messages: Iterable[Message]):
        for message in messages:
            self.add(message)

    def get_by_role(self, role: str) -> list[Message]:
        """Return all messages of a specified role"""
        return [message for message in self.storage if message.role == role]

    def get_by_content(self, content: str) -> list[Message]:
        """Return all messages containing a specified content"""
        return [message for message in self.storage if content in message.content]

    def delete_newest(self) -> "Message":
        """delete the newest message from the storage"""
        if len(self.storage) > 0:
            newest_msg = self.storage.pop()
            if newest_msg.cause_by and newest_msg in self.index[newest_msg.cause_by]:
                self.index[newest_msg.cause_by].remove(newest_msg)
        else:
            newest_msg = None
        return newest_msg

    def delete(self, message: Message):
        """Delete the specified message from storage, while updating the index"""

        self.storage.remove(message)
        if message.cause_by and message in self.index[message.cause_by]:
            self.index[message.cause_by].remove(message)

    def clear(self):
        """Clear storage and index"""
        self.storage = []
        self.index = defaultdict(list)

    def count(self) -> int:
        """Return the number of messages in storage"""
        return len(self.storage)

    def try_remember(self, keyword: str) -> list[Message]:
        """Try to recall all messages containing a specified keyword"""
        return [message for message in self.storage if keyword in message.content]

    def get(self, k=0) -> list[Message]:
        """Return the most recent k memories, return all when k=0"""
        return self.storage[-k:]

    def find_news(self, observed: list[Message], k=0) -> list[Message]:
        """find news (previously unseen messages) from the the most recent k memories, from all memories when k=0"""
        already_observed = self.get(k)
        news: list[Message] = []
        for i in observed:
            if i in already_observed:
                continue
            news.append(i)
        return news


