from core.builtin_concepts import BuiltinConcepts
from evaluators.BaseEvaluator import AllReturnValuesEvaluator
from parsers.BaseParser import BaseParser


class OneErrorEvaluator(AllReturnValuesEvaluator):
    """
    Use to reduce when there is only one evaluator in error
    The rest of the return values must be parsers in error
    """

    NAME = "OneError"

    def __init__(self):
        super().__init__(self.NAME, [BuiltinConcepts.AFTER_EVALUATION], 30)
        self.return_value_in_error = None

    def matches(self, context, return_values):
        nb_evaluators_in_error = 0
        to_process = False

        for ret in return_values:
            if ret.status and (ret.who.startswith(self.PREFIX) or ret.who.startswith(BaseParser.PREFIX)):
                return False
            elif ret.status and context.sheerka.isinstance(ret.body, BuiltinConcepts.REDUCE_REQUESTED):
                to_process = True
                self.eaten.append(ret)
            elif not ret.status and ret.who.startswith(self.PREFIX):
                nb_evaluators_in_error += 1
                self.return_value_in_error = ret
                self.eaten.append(ret)
            elif not ret.status and ret.who.startswith(BaseParser.PREFIX):
                self.eaten.append(ret)

        return to_process and nb_evaluators_in_error == 1

    def eval(self, context, return_values):
        context.log(self.verbose_log, f"1 return value in error, {len(self.eaten)} item(s) eaten", who=self)
        context.log(self.verbose_log, f"{self.return_value_in_error}", who=self)

        sheerka = context.sheerka
        return sheerka.ret(self.name, False, self.return_value_in_error.value, parents=self.eaten)