from typing import Optional,ClassVar

from pydantic import BaseModel, Field, field_validator, model_validator

class ChromaDbConfig(BaseModel):
    try:
        from chromadb.api.client import Client
    except ImportError:
        raise ImportError("Chromadb requires extra dependencies. Install with `pip install chromadb`") from None
    Client: ClassVar[type] = Client

    collection_name: str = Field("mem0", description="Default name for the collection")
    client: Optional[Client] = Field(None, description="Existing ChromaDB client instance")
    path: Optional[str] = Field(None, description="Path to the database directory")
    host: Optional[str] = Field(None, description="Database connection remote host")
    port: Optional[int] = Field(None, description="Database connection remote port")

    @model_validator(mode="before")
    def check_host_port_or_path(cls, values):
        host, port, path = values.get("host"), values.get("port"), values.get("path")
        if not path and not (host and port):
            raise ValueError("Either 'host' and 'port' or 'path' must be provided.")
        return values
    
    class Config:
        arbitrary_types_allowed = True