from fun_text_processing.text_normalization.zh.graph_utils import GraphFst
from fun_text_processing.text_normalization.zh.taggers.cardinal import Cardinal
from pynini.lib import pynutil


class Fraction(GraphFst):
    """
    tokens { fraction { denominator: "5" numerator: "1" } } -> 五分之一
    """

    def __init__(self, deterministic: bool = True, lm: bool = False):
        super().__init__(name="fraction", kind="verbalize", deterministic=deterministic)

        denominator = (
            pynutil.delete('denominator: "') + Cardinal().graph_cardinal + pynutil.delete('"')
        )
        numerator = pynutil.delete('numerator: "') + Cardinal().graph_cardinal + pynutil.delete('"')
        graph = denominator + pynutil.delete(" ") + pynutil.insert("分之") + numerator

        self.fst = self.delete_tokens(graph).optimize()