from __future__ import annotations

from datetime import datetime, timezone
from typing import Any, Literal

from pydantic import BaseModel, Field


AgentMessageType = Literal[
    "task_request",
    "task_update",
    "handoff",
    "verification_request",
    "verification_feedback",
    "interrupt_notice",
]


class AgentMessage(BaseModel):
    message_id: str
    thread_id: str
    from_agent_id: str
    to_agent_id: str
    task_id: str | None = None
    reply_to_message_id: str | None = None
    message_type: AgentMessageType = "task_update"
    content_summary: str
    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
    payload: dict[str, Any] = Field(default_factory=dict)