"""
This file is adapted from https://github.com/hpbyte/Myanmar_Number_to_Words
"""
import re

mm_digit = {
    "၀": "သုည",
    "၁": "တစ်",
    "၂": "နှစ်",
    "၃": "သုံ:",
    "၄": "လေ:",
    "၅": "ငါ:",
    "၆": "ခြောက်",
    "၇": "ခုနှစ်",
    "၈": "ရှစ်",
    "၉": "ကို:",
}

# regular expressions
rgxPh = "^(၀၁|၀၉)"
rgxDate = "[၀-၉]{1,2}-[၀-၉]{1,2}-[၀-၉]{4}|[၀-၉]{1,2}\/[၀-၉]{1,2}\/[၀-၉]{4}"
rgxTime = "[၀-၉]{1,2}:[၀-၉]{1,2}"
rgxDec = "[၀-၉]*\.[၀-၉]*"
rgxAmt = "[,၀-၉]+"


def convert_digit(num):
    """
    @type     num   str
    @param    num   Myanmar number
    @rtype          str
    @return         converted Myanmar spoken words
    """

    converted = ""
    nb_digits = len(num)

    def check_if_zero(pos):
        return not num[-pos] == "၀"

    def hundred_thousandth_val():
        n = num[:-5]
        return (
            ("သိန်: " + mm_num2word(n))
            if (n[-2:] == "၀၀")
            else (mm_num2word(n) + "သိန်: ")
        )

    def thousandth_val():
        return mm_digit[num[-4]] + ("ထောင် " if (num[-3:] == "၀၀၀") else "ထောင့် ")

    def hundredth_val():
        return mm_digit[num[-3]] + (
            "ရာ့ "
            if (
                (num[-2] == "၀" and re.match(r"[၁-၉]", num[-1]))
                or (re.match(r"[၁-၉]", num[-2]) and num[-1] == "၀")
            )
            else "ရာ "
        )

    def tenth_val():
        return ("" if (num[-2] == "၁") else mm_digit[num[-2]]) + (
            "ဆယ် " if (num[-1] == "၀") else "ဆယ့် "
        )

    if nb_digits > 5:
        converted += hundred_thousandth_val()
    if (nb_digits > 4) and check_if_zero(5):
        converted += mm_digit[num[-5]] + "သောင်: "
    if (nb_digits > 3) and check_if_zero(4):
        converted += thousandth_val()
    if (nb_digits > 2) and check_if_zero(3):
        converted += hundredth_val()
    if (nb_digits > 1) and check_if_zero(2):
        converted += tenth_val()
    if (nb_digits > 0) and check_if_zero(1):
        converted += mm_digit[num[-1]]

    return converted


def mm_num2word(num):
    """
    Detect type of number and convert accordingly

    @type     num   str
    @param    num   Myanmar number
    @rtype          str
    @return         converted Myanmar spoken words
    """

    word = ""

    # phone number
    if re.match(r"" + rgxPh, num[:2]):
        word = " ".join([(mm_digit[d] if not d == "၇" else "ခွန်") for d in num])
    # date
    elif re.match(r"" + rgxDate, num):
        n = re.split(r"-|/", num)
        word = (
            convert_digit(n[-1])
            + " ခုနှစ် "
            + convert_digit(n[1])
            + " လပိုင်: "
            + convert_digit(n[0])
            + " ရက်"
        )
    # time
    elif re.match(r"" + rgxTime, num):
        n = re.split(r":", num)
        word = (convert_digit(n[0]) + " နာရီ ") + (
            "ခွဲ" if (n[1] == "၃၀") else (convert_digit(n[1]) + " မိနစ်")
        )
    # decimal
    elif re.match(r"" + rgxDec, num):
        n = re.split(r"\.", num)
        word = convert_digit(n[0]) + " ဒဿမ " + " ".join([mm_digit[d] for d in n[1]])
    # amount
    elif re.match(r"" + rgxAmt, num):
        word = convert_digit(num.replace(",", ""))
    # default
    else:
        raise Exception("Cannot convert the provided number format!")

    return word


def extract_num(S):
    """
    Extract numbers from the input string

    @type     S   str
    @param    S   Myanmar sentence
    @rtype        list
    @return       a list of Myanmar numbers
    """
    matchedNums = re.compile(
        "%s|%s|%s|%s" % (rgxDate, rgxTime, rgxDec, rgxAmt)
    ).findall(S)

    return matchedNums