from pydantic import BaseModel
from typing import Optional, List
from enum import Enum

class MessageType(str, Enum):
    INITIATE = "initiate"
    PROPOSAL = "proposal"
    ACCEPT = "accept"
    COUNTER = "counter"
    ESCALATE = "escalate"

class AgentMessage(BaseModel):
    message_id: str
    negotiation_id: str
    message_type: MessageType
    sender_id: int
    receiver_id: int
    round_number: int
    payload: dict
    reasoning: str = ""
    satisfaction_score: float = 0.0
    concessions_made: List[str] = []
    concessions_requested: List[str] = []
    timestamp: str = ""