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"""Handle decimal formatting.
See: https://unicode-org.github.io/icu-docs/apidoc/released/icu4c/classicu_1_1DecimalFormat.html
"""
from decimal import Decimal
from typing import Union
def format_decimal(value: Union[int, float, str, Decimal], pattern: str) -> str:
"""Format a number according to a simplified ICU DecimalFormat pattern."""
# Split the pattern into integer and fractional parts
if "." in pattern:
integer_part, fractional_part = pattern.split(".")
else:
integer_part, fractional_part = pattern, ""
# Determine grouping (e.g., thousands separator)
grouping = "," in integer_part
min_integer_digits = integer_part.replace(",", "").count("0")
# Determine the number of decimal places
min_fraction_digits = fractional_part.count("0")
max_fraction_digits = len(fractional_part)
# Round the number to the maximum fractional digits
format_str = f"{{:.{max_fraction_digits}f}}"
rounded_value = format_str.format(value)
# Split the rounded value into integer and fractional parts
if fractional_part:
integer_value, fractional_value = rounded_value.split(".")
fractional_value = fractional_value[:max_fraction_digits].rstrip("0")
else:
integer_value, fractional_value = rounded_value, ""
# Apply integer padding
if len(integer_value) < min_integer_digits:
integer_value = integer_value.zfill(min_integer_digits)
# Apply grouping
if grouping:
# pylint: disable=consider-using-f-string
integer_value = "{:,}".format(int(integer_value))
# Combine integer and fractional parts
if min_fraction_digits > 0:
fractional_value = fractional_value.ljust(min_fraction_digits, "0")
formatted_number = f"{integer_value}.{fractional_value}"
else:
formatted_number = integer_value
return formatted_number
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