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from hamcrest.core.base_matcher import BaseMatcher
from hamcrest.core.description import Description
from hamcrest.core.matcher import Matcher

__author__ = "Jon Reid"
__copyright__ = "Copyright 2011 hamcrest.org"
__license__ = "BSD, see License.txt"


def stripspace(string: str) -> str:
    result = ""
    last_was_space = True
    for character in string:
        if character.isspace():
            if not last_was_space:
                result += " "
            last_was_space = True
        else:
            result += character
            last_was_space = False
    return result.strip()


class IsEqualIgnoringWhiteSpace(BaseMatcher[str]):
    def __init__(self, string) -> None:
        if not isinstance(string, str):
            raise TypeError("IsEqualIgnoringWhiteSpace requires string")
        self.original_string = string
        self.stripped_string = stripspace(string)

    def _matches(self, item: str) -> bool:
        if not isinstance(item, str):
            return False
        return self.stripped_string == stripspace(item)

    def describe_to(self, description: Description) -> None:
        description.append_description_of(self.original_string).append_text(" ignoring whitespace")


def equal_to_ignoring_whitespace(string: str) -> Matcher[str]:
    """Matches if object is a string equal to a given string, ignoring
    differences in whitespace.

    :param string: The string to compare against as the expected value.

    This matcher first checks whether the evaluated object is a string. If so,
    it compares it with ``string``, ignoring differences in runs of whitespace.

    Example::

        equal_to_ignoring_whitespace("hello world")

    will match ``"hello   world"``.

    """
    return IsEqualIgnoringWhiteSpace(string)