"""IPC message type definitions."""

from __future__ import annotations

from dataclasses import dataclass, field
from typing import Any


@dataclass
class IPCMessage:
    """A message exchanged between Rust and Python via JSON-line protocol."""

    id: str
    type: str
    payload: dict[str, Any] = field(default_factory=dict)

    def to_dict(self) -> dict[str, Any]:
        return {"id": self.id, "type": self.type, "payload": self.payload}

    @classmethod
    def from_dict(cls, data: dict[str, Any]) -> IPCMessage:
        return cls(
            id=data.get("id", ""),
            type=data.get("type", ""),
            payload=data.get("payload", {}),
        )


def progress_message(request_id: str, percent: int, stage: str, message: str) -> IPCMessage:
    return IPCMessage(
        id=request_id,
        type="progress",
        payload={"percent": percent, "stage": stage, "message": message},
    )


def error_message(request_id: str, code: str, message: str) -> IPCMessage:
    return IPCMessage(
        id=request_id,
        type="error",
        payload={"code": code, "message": message},
    )


def ready_message() -> IPCMessage:
    return IPCMessage(id="system", type="ready", payload={"version": "0.1.0"})