import pynini
from fun_text_processing.text_normalization.en.graph_utils import (
    DAMO_NOT_QUOTE,
    GraphFst,
    delete_extra_space,
    delete_preserve_order,
)
from pynini.lib import pynutil


class MoneyFst(GraphFst):
    """
    Finite state transducer for verbalizing money, e.g.
        money { integer_part: "twelve" fractional_part: "o five" currency: "dollars" } -> twelve o five dollars

    Args:
        decimal: DecimalFst
        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, deterministic: bool = True):
        super().__init__(name="money", kind="verbalize", deterministic=deterministic)
        keep_space = pynini.accep(" ")
        maj = (
            pynutil.delete('currency_maj: "')
            + pynini.closure(DAMO_NOT_QUOTE, 1)
            + pynutil.delete('"')
        )
        min = (
            pynutil.delete('currency_min: "')
            + pynini.closure(DAMO_NOT_QUOTE, 1)
            + pynutil.delete('"')
        )

        fractional_part = (
            pynutil.delete('fractional_part: "')
            + pynini.closure(DAMO_NOT_QUOTE, 1)
            + pynutil.delete('"')
        )

        integer_part = decimal.integer

        #  *** currency_maj
        graph_integer = integer_part + keep_space + maj

        #  *** currency_maj + (***) | ((and) *** current_min)
        fractional = fractional_part + delete_extra_space + min

        if not deterministic:
            fractional |= pynutil.insert("and ") + fractional

        graph_integer_with_minor = (
            integer_part + keep_space + maj + keep_space + fractional + delete_preserve_order
        )

        # *** point *** currency_maj
        graph_decimal = decimal.numbers + keep_space + maj

        # *** current_min
        graph_minor = fractional_part + delete_extra_space + min + delete_preserve_order

        graph = graph_integer | graph_integer_with_minor | graph_decimal | graph_minor

        if not deterministic:
            graph |= graph_integer + delete_preserve_order

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