from typing import Literal, Optional, Union

from pydantic import BaseModel, Field, RootModel


class JoinRequest(BaseModel):
    kind: Literal["JoinRequest"] = "JoinRequest"
    token: str
    peer: str
    username: Optional[str] = ""


class OperationMessage(BaseModel):
    """Message sent from one peer to all the others"""

    kind: Literal["OperationMessage"] = "OperationMessage"
    verb: Literal["upsert", "update", "delete"]
    subject: Literal["map", "datalayer", "feature"]
    metadata: Optional[dict] = None
    key: Optional[str] = None


class PeerMessage(BaseModel):
    """Message sent from a specific peer to another one"""

    kind: Literal["PeerMessage"] = "PeerMessage"
    sender: str
    recipient: str
    # The message can be whatever the peers want. It's not checked by the server.
    message: dict


class Request(RootModel):
    """Any message coming from the websocket should be one of these, and will be rejected otherwise."""

    root: Union[PeerMessage, OperationMessage] = Field(discriminator="kind")


class JoinResponse(BaseModel):
    """Server response containing the list of peers"""

    kind: Literal["JoinResponse"] = "JoinResponse"
    peers: dict
    peer: str


class ListPeersResponse(BaseModel):
    kind: Literal["ListPeersResponse"] = "ListPeersResponse"
    peers: dict
