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from __future__ import annotations

from typing import NamedTuple


class TaskInstanceKey(NamedTuple):
    """Key used to identify task instance."""

    dag_id: str
    task_id: str
    run_id: str
    try_number: int = 1
    map_index: int = -1

    @property
    def primary(self) -> tuple[str, str, str, int]:
        """Return task instance primary key part of the key."""
        return self.dag_id, self.task_id, self.run_id, self.map_index

    @property
    def reduced(self) -> TaskInstanceKey:
        """Remake the key by subtracting 1 from try number to match in memory information."""
        # todo (dstandish): remove this property
        return TaskInstanceKey(
            self.dag_id, self.task_id, self.run_id, max(1, self.try_number - 1), self.map_index
        )

    def with_try_number(self, try_number: int) -> TaskInstanceKey:
        """Return TaskInstanceKey with provided ``try_number``."""
        return TaskInstanceKey(self.dag_id, self.task_id, self.run_id, try_number, self.map_index)

    @property
    def key(self) -> TaskInstanceKey:
        """
        For API-compatibly with TaskInstance.

        Returns self
        """
        return self

    @classmethod
    def from_dict(cls, dictionary):
        """Create TaskInstanceKey from dictionary."""
        return cls(**dictionary)