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# Licensed under the Apache License, Version 2.0 (the "License");
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#     http://www.apache.org/licenses/LICENSE-2.0
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import pynini
from pynini.lib import pynutil

from nemo_text_processing.text_normalization.en.graph_utils import NEMO_NOT_QUOTE, GraphFst, delete_space


class TimeFst(GraphFst):
    """
    Finite state transducer for verbalizing time
        e.g.  time { hours: "ինն" minutes: "քսաներկու" } -> ինն անց քսաներկու

    """

    def __init__(self):
        super().__init__(name="time", kind="verbalize")
        numerator = pynutil.delete("hours: \"") + pynini.closure(NEMO_NOT_QUOTE, 1) + pynutil.delete("\"")

        denominator = (
            pynutil.insert(' անց ')
            + pynutil.delete("minutes: \"")
            + pynini.closure(NEMO_NOT_QUOTE, 1)
            + pynutil.delete("\"")
        )

        graph = (numerator + delete_space + denominator).optimize()
        self.numbers = graph.optimize()
        delete_tokens = self.delete_tokens(graph)
        self.fst = delete_tokens.optimize()