import pynini
from fun_text_processing.text_normalization.en.graph_utils import (
    DAMO_NOT_QUOTE,
    GraphFst,
    delete_space,
    insert_space,
)
from pynini.lib import pynutil


class MeasureFst(GraphFst):
    """
    Finite state transducer for verbalizing measure, e.g.
        measure { negative: "true" cardinal { integer: "twelve" } units: "kilograms" } -> minus twelve kilograms
        measure { decimal { integer_part: "twelve" fractional_part: "five" } units: "kilograms" } -> twelve point five kilograms
        tokens { measure { units: "covid" decimal { integer_part: "nineteen"  fractional_part: "five" }  } } -> covid nineteen point five

    Args:
        decimal: DecimalFst
        cardinal: CardinalFst
        fraction: FractionFst
        deterministic: if True will provide a single transduction option,
            for False multiple transduction are generated (used for audio-based normalization)
    """

    def __init__(
        self, decimal: GraphFst, cardinal: GraphFst, fraction: GraphFst, deterministic: bool = True
    ):
        super().__init__(name="measure", kind="verbalize", deterministic=deterministic)
        optional_sign = cardinal.optional_sign
        unit = (
            pynutil.delete('units: "')
            + pynini.difference(pynini.closure(DAMO_NOT_QUOTE, 1), pynini.union("address", "math"))
            + pynutil.delete('"')
            + delete_space
        )

        if not deterministic:
            unit |= pynini.compose(unit, pynini.cross(pynini.union("inch", "inches"), '"'))

        graph_decimal = (
            pynutil.delete("decimal {")
            + delete_space
            + optional_sign
            + delete_space
            + decimal.numbers
            + delete_space
            + pynutil.delete("}")
        )
        graph_cardinal = (
            pynutil.delete("cardinal {")
            + delete_space
            + optional_sign
            + delete_space
            + cardinal.numbers
            + delete_space
            + pynutil.delete("}")
        )

        graph_fraction = (
            pynutil.delete("fraction {")
            + delete_space
            + fraction.graph
            + delete_space
            + pynutil.delete("}")
        )

        graph = (
            (graph_cardinal | graph_decimal | graph_fraction) + delete_space + insert_space + unit
        )

        # SH adds "preserve_order: true" by default
        preserve_order = (
            pynutil.delete("preserve_order:") + delete_space + pynutil.delete("true") + delete_space
        )
        graph |= (
            unit
            + insert_space
            + (graph_cardinal | graph_decimal)
            + delete_space
            + pynini.closure(preserve_order)
        )
        # for only unit
        graph |= (
            pynutil.delete('cardinal { integer: "-"')
            + delete_space
            + pynutil.delete("}")
            + delete_space
            + unit
            + pynini.closure(preserve_order)
        )
        address = (
            pynutil.delete('units: "address" ')
            + delete_space
            + graph_cardinal
            + delete_space
            + pynini.closure(preserve_order)
        )
        math = (
            pynutil.delete('units: "math" ')
            + delete_space
            + graph_cardinal
            + delete_space
            + pynini.closure(preserve_order)
        )
        graph |= address | math

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