from difflib import Differ
from typing import Tuple, Iterable
import logging


def compute_diff(text1, text2) -> Iterable[Tuple[str, str | None]]:
    d = Differ()
    pairs = [
        (token[2:], token[0] if token[0] != " " else None)
        for token in d.compare(text1, text2)
    ] 
    return _postprocess_compute_diff(pairs)


def _postprocess_compute_diff(pairs: Iterable[Tuple[str, str | None]]) -> Iterable[Tuple[str, str | None]]:
    """Whitespace deletions add additions are missed by the diff component."""
    for idx, (char, flag) in enumerate(pairs):
        if char == " " and flag in ["+", "-"]:
            if idx > 0 and idx < len(pairs):
                if pairs[idx - 1][1] == flag or pairs[idx + 1][1] == flag:
                    yield (" ", flag)
                else: 
                    yield ("^", "+") if flag == "+" else ("#", "-")
        else:
            yield (char, flag)


def get_logger():
    logging.basicConfig(
        level=logging.INFO,
        format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
    )
    return logging.getLogger(__name__)


LANGS = {
    "All": None,
    "English": "en",
    "French": "fr",
    "German": "de",
    "Spanish": "es",
    "Italian": "it",
    "Dutch": "nl",
    "Polish": "pl",
    "Portuguese": "pt",
    "Swedish": "sv",
    "Bulgarian": "bg",
    "Romanian": "ro",
    "Finnish": "fi",
    "Russian": "ru",
    "Norwegian Bokmål": "nb",
    "Czech": "cs",
    "Thai": "th",
    "Danish": "da",
    "Croatian": "hr",
    "Hungarian": "hu",
    "Arabic": "ar",
    "Greek": "el",
    "Japanese": "ja",
    "Catalan": "ca",
    "Serbian": "sr",
    "Slovenian": "sl",
    "Slovak": "sk",
    "Turkish": "tr",
    "Lithuanian": "lt",
    "Chinese": "zh",
    "Estonian": "et",
    "Latvian": "lv",
    "Undefined": "xx",
    "Ukrainian": "uk",
    "Indonesian": "id",
    "Hebrew": "he",
    "Vietnamese": "vi",
    "Icelandic": "is",
    "Latin": "la",
    "Korean": "ko",
    "Albanian": "sq",
    "Georgian": "ka",
    "Malay": "ms",
    "Bosnian": "bs",
    "Persian": "fa",
    "Bengali": "bn",
    "Galician": "gl",
    "Kazakh": "kk",
    "Macedonian": "mk",
    "Norwegian Nynorsk": "nn",
    "Hindi": "hi",
    "Afar": "aa",
    "Uzbek": "uz",
    "Somali": "so",
    "Afrikaans": "af"
}