from smnp.error.runtime import RuntimeException
from smnp.runtime.evaluator import Evaluator
from smnp.runtime.evaluators.expression import expressionEvaluator
from smnp.type.model import Type


class ProductEvaluator(Evaluator):

    @classmethod
    def evaluator(cls, node, environment):
        left = expressionEvaluator(doAssert=True)(node.left, environment).value
        right = expressionEvaluator(doAssert=True)(node.right, environment).value

        if left.type != Type.INTEGER:
            raise RuntimeException(
                f"Operator '{node.operator.value}' is supported only by {Type.INTEGER.name.lower()} type", node.left.pos)

        if right.type != Type.INTEGER:
            raise RuntimeException(
                f"Operator '{node.operator.value}' is supported only by {Type.INTEGER.name.lower()} type", node.right.pos)

        if node.operator.value == "*":
            return Type.integer(int(left.value * right.value))

        if node.operator.value == "/":
            if right.value == 0:
                raise RuntimeException("Attempt to divide by 0", node.right.pos)
            return Type.integer(int(left.value / right.value))

        raise RuntimeError("This line should never be reached")