"""
Arabic Text Utilities
=====================
Helper functions for Arabic text analysis
"""

import re
from typing import List


def is_arabic_char(char: str) -> bool:
    """Check if character is Arabic"""
    if len(char) != 1:
        return False
    code = ord(char)
    return (
        (0x0600 <= code <= 0x06FF) or  # Arabic
        (0x0750 <= code <= 0x077F) or  # Arabic Supplement
        (0x08A0 <= code <= 0x08FF) or  # Arabic Extended-A
        (0xFB50 <= code <= 0xFDFF) or  # Arabic Presentation Forms-A
        (0xFE70 <= code <= 0xFEFF)     # Arabic Presentation Forms-B
    )


def count_arabic_chars(text: str) -> int:
    """Count Arabic characters in text"""
    return sum(1 for c in text if is_arabic_char(c))


def has_diacritics(text: str) -> bool:
    """Check if text contains Arabic diacritics (tashkeel)"""
    diacritics = set('ًٌٍَُِّْٰ')
    return any(c in diacritics for c in text)


def normalize_arabic(text: str) -> str:
    """Basic Arabic normalization"""
    # Normalize alef variants
    text = re.sub('[إأآا]', 'ا', text)
    # Normalize yeh
    text = re.sub('ى', 'ي', text)
    # Normalize teh marbuta
    text = re.sub('ة', 'ه', text)
    return text


def get_arabic_words(text: str) -> List[str]:
    """Extract Arabic words from text"""
    words = text.split()
    return [w for w in words if any(is_arabic_char(c) for c in w)]


def remove_diacritics(text: str) -> str:
    """Remove Arabic diacritics from text"""
    diacritics = 'ًٌٍَُِّْٰ'
    return ''.join(c for c in text if c not in diacritics)