from dataclasses import dataclass
from typing import Optional


@dataclass
class StepTrace:
    step_no: int
    timestamp: float

    thought: Optional[str]

    action_type: str
    action_target: Optional[str]
    action_value: Optional[str]

    url_before: Optional[str]
    url_after: Optional[str]

    screenshot_before: Optional[str]
    screenshot_after: Optional[str]

    success: bool
    error: Optional[str] = None