from datetime import datetime, timezone
from typing import Any, Dict, Optional
from pydantic import BaseModel, Field

from crewai.utilities.serialization import to_serializable


class BaseEvent(BaseModel):
    """Base class for all events"""

    timestamp: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
    type: str
    source_fingerprint: Optional[str] = None  # UUID string of the source entity
    source_type: Optional[str] = None  # "agent", "task", "crew", "memory", "entity_memory", "short_term_memory", "long_term_memory", "external_memory"
    fingerprint_metadata: Optional[Dict[str, Any]] = None  # Any relevant metadata

    def to_json(self, exclude: set[str] | None = None):
        """
        Converts the event to a JSON-serializable dictionary.

        Args:
            exclude (set[str], optional): Set of keys to exclude from the result. Defaults to None.

        Returns:
            dict: A JSON-serializable dictionary.
        """
        return to_serializable(self, exclude=exclude)