import time
from typing import List

from _internal_mitmproxy import flow
from _internal_mitmproxy.coretypes import serializable


class TCPMessage(serializable.Serializable):
    """
    An individual TCP "message".
    Note that TCP is *stream-based* and not *message-based*.
    For practical purposes the stream is chunked into messages here,
    but you should not rely on message boundaries.
    """

    def __init__(self, from_client, content, timestamp=None):
        self.from_client = from_client
        self.content = content
        self.timestamp = timestamp or time.time()

    @classmethod
    def from_state(cls, state):
        return cls(*state)

    def get_state(self):
        return self.from_client, self.content, self.timestamp

    def set_state(self, state):
        self.from_client, self.content, self.timestamp = state

    def __repr__(self):
        return "{direction} {content}".format(
            direction="->" if self.from_client else "<-",
            content=repr(self.content)
        )


class TCPFlow(flow.Flow):
    """
    A TCPFlow is a simplified representation of a TCP session.
    """

    messages: List[TCPMessage]
    """
    The messages transmitted over this connection.

    The latest message can be accessed as `flow.messages[-1]` in event hooks.
    """

    def __init__(self, client_conn, server_conn, live=None):
        super().__init__("tcp", client_conn, server_conn, live)
        self.messages = []

    _stateobject_attributes = flow.Flow._stateobject_attributes.copy()
    _stateobject_attributes["messages"] = List[TCPMessage]

    def __repr__(self):
        return "<TCPFlow ({} messages)>".format(len(self.messages))


__all__ = [
    "TCPFlow",
    "TCPMessage",
]
