"""
Similarity calculation engine
"""

from typing import List, Tuple, Dict, Any
from ..core.exceptions import SimilarityError


class SimilarityEngine:
    """
    Engine for calculating phonetic similarity between Chinese words
    
    This is a placeholder implementation that will be expanded with
    the actual similarity calculation algorithms.
    """
    
    def __init__(self):
        """Initialize similarity engine"""
        pass
    
    def calculate_phonetic_similarity(self, word1: str, word2: str) -> float:
        """
        Calculate phonetic similarity between two words
        
        Args:
            word1: First word
            word2: Second word
            
        Returns:
            Similarity score between 0.0 and 1.0
        """
        # Placeholder implementation
        if word1 == word2:
            return 1.0
        
        # Simple character overlap similarity
        set1, set2 = set(word1), set(word2)
        intersection = len(set1 & set2)
        union = len(set1 | set2)
        
        return intersection / union if union > 0 else 0.0
    
    def batch_calculate_similarity(self, word_pairs: List[Tuple[str, str]]) -> List[float]:
        """
        Calculate similarity for multiple word pairs
        
        Args:
            word_pairs: List of (word1, word2) tuples
            
        Returns:
            List of similarity scores
        """
        return [self.calculate_phonetic_similarity(w1, w2) for w1, w2 in word_pairs]