"""
Monitoring utilities for tracking execution timing and token usage.
"""

from dataclasses import dataclass, field

__all__ = ["Timing", "TokenUsage"]


@dataclass
class TokenUsage:
    """
    Contains the token usage information for a given step or run.
    """

    input_tokens: int
    output_tokens: int
    total_tokens: int = field(init=False)

    def __post_init__(self):
        self.total_tokens = self.input_tokens + self.output_tokens

    def dict(self):
        return {
            "input_tokens": self.input_tokens,
            "output_tokens": self.output_tokens,
            "total_tokens": self.total_tokens,
        }


@dataclass
class Timing:
    """
    Contains the timing information for a given step or run.
    """

    start_time: float
    end_time: float | None = None

    @property
    def duration(self):
        return None if self.end_time is None else self.end_time - self.start_time

    def dict(self):
        return {
            "start_time": self.start_time,
            "end_time": self.end_time,
            "duration": self.duration,
        }

    def __repr__(self) -> str:
        return f"Timing(start_time={self.start_time}, end_time={self.end_time}, duration={self.duration})"