#  Copyright (c) PARRRATE T&V 2021. All rights reserved.

from bu4.evaluation.av.envtype import envtype
from bu4.evaluation.constructs.edelayed import EDelayed
from bu4.evaluation.constructs.evaluable import Evaluable
from bu4.indexing.constructs.idelayed import IDelayed
from bu4.indexing.constructs.indexed import Indexed
from bu4.linking.constructs.linked import Linked
from bu4.transform.states.aftertransform import AfterTransform
from bu4.transform.states.transformfinished import TransformFinished
from bu4.transform.states.transformstart import TransformStart
from bu4.transform.states.transformstate import TransformState
from bu4.transform.targets.atlambda import ATLambda

__all__ = ('LDelayed',)


class LDelayed(Linked):
    value: Linked

    def __init__(self, value: Linked):
        self.value = value
        self.future = self.value.future
        self.multifuture = self.future

    def attach(self, env: envtype) -> Evaluable:
        return EDelayed(env, self.value)

    def index(self, promise: list[bytes]) -> TransformState[Indexed]:
        return AfterTransform(
            TransformStart(lambda: self.value.index(promise)),
            ATLambda(
                lambda value: TransformFinished(IDelayed(value))
            )
        )

    def __str__(self):
        return f'(){self.value}'