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from __future__ import annotations

from datetime import datetime

from pydantic import computed_field

from airflow.api_fastapi.core_api.base import BaseModel
from airflow.utils.state import DagRunState


class DAGRunLightResponse(BaseModel):
    """DAG Run serializer for responses."""

    id: int
    dag_id: str
    run_id: str
    logical_date: datetime | None
    run_after: datetime
    start_date: datetime | None
    end_date: datetime | None
    state: DagRunState

    @computed_field
    def duration(self) -> float | None:
        if self.end_date and self.start_date:
            return (self.end_date - self.start_date).total_seconds()
        return None


class DurationStats(BaseModel):
    """Duration statistics for a DAG across historical runs."""

    mean: float
    mode: float | None
    p50: float
    p90: float
    p95: float
    p99: float


class DagRunStatsResponse(BaseModel):
    """DAG Run statistics serializer for responses."""

    duration: DurationStats | None
