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from core.fraud_detector_utils import FraudDetectorUtils
from rules.detector_rule_base import DetectorRuleBase


class DetectorRuleModelScorePositive(DetectorRuleBase):

    def validate(self):
        """
        Assume that the rule is always valid, since we are creating the model score variable.
        :return:
        """
        return None

    def __init__(self, rule_id, model_name, threshold, fraud_detector_utils=None):
        self.fraud_detector_utils = fraud_detector_utils or FraudDetectorUtils()
        self.threshold = threshold
        self.model_name = model_name
        self._rule_id = rule_id

    @property
    def rule_id(self):
        return self._rule_id

    @property
    def outcomes(self):
        return ["positive"]

    @property
    def description(self):
        return "Returns POSITIVE outcome if the model score is greater than threshold"

    def get_rule_expression(self):
        """
        Returns a single rule expression
        :return:
        """
        model_score_variable = "{}_insightscore".format(self.model_name)

        rule_expression = f"${model_score_variable} >= {self.threshold}"

        return rule_expression