import logging
from typing import List, Dict, Any, Optional
from dataclasses import dataclass
from datetime import datetime
from .text_extractor import ExtractedDocument
import re

logger = logging.getLogger(__name__)

@dataclass
class IntegratedContent:
    """整合后的内容"""
    documents: List[ExtractedDocument]
    document_count: int
    total_content_length: int
    document_types: Dict[str, int]
    combined_content: str
    content_summary: str
    key_topics: List[str]
    
    def __post_init__(self):
        """初始化后处理"""
        if not self.document_types:
            self.document_types = {}
            for doc in self.documents:
                ext = doc.file_type.lower()
                self.document_types[ext] = self.document_types.get(ext, 0) + 1

class ContentIntegrator:
    """内容整合器 - 整合多个文档的信息"""
    
    def __init__(self):
        pass
    
    def integrate_documents(self, documents: List[ExtractedDocument]) -> IntegratedContent:
        """整合多个文档
        
        Args:
            documents: 提取的文档列表
            
        Returns:
            IntegratedContent: 整合后的内容
        """
        if not documents:
            return IntegratedContent(
                documents=[],
                document_count=0,
                total_content_length=0,
                document_types={},
                combined_content="",
                content_summary="没有提供文档内容",
                key_topics=[]
            )
        
        # 统计文档类型
        document_types = {}
        for doc in documents:
            ext = doc.file_type.lower()
            document_types[ext] = document_types.get(ext, 0) + 1
        
        # 合并内容
        combined_content = self._combine_content(documents)
        total_length = len(combined_content)
        
        # 生成摘要
        content_summary = self._generate_summary(documents)
        
        # 提取关键主题
        key_topics = self._extract_key_topics(combined_content)
        
        return IntegratedContent(
            documents=documents,
            document_count=len(documents),
            total_content_length=total_length,
            document_types=document_types,
            combined_content=combined_content,
            content_summary=content_summary,
            key_topics=key_topics
        )
    
    def _combine_content(self, documents: List[ExtractedDocument]) -> str:
        """合并文档内容"""
        combined = []
        
        for i, doc in enumerate(documents, 1):
            combined.append(f"=== 文档 {i}: {doc.filename} ===")
            combined.append(f"文件类型: {doc.file_type}")
            combined.append(f"文件大小: {doc.file_size} 字节")
            combined.append(f"提取时间: {doc.extracted_at}")
            combined.append("")
            combined.append("内容:")
            combined.append(doc.content)
            combined.append("")
            combined.append("=" * 50)
            combined.append("")
        
        return "\n".join(combined)
    
    def _generate_summary(self, documents: List[ExtractedDocument]) -> str:
        """生成内容摘要"""
        if not documents:
            return "没有文档内容"
        
        summary_parts = []
        summary_parts.append(f"共处理了 {len(documents)} 个文档:")
        
        for i, doc in enumerate(documents, 1):
            content_preview = doc.content[:100] + "..." if len(doc.content) > 100 else doc.content
            summary_parts.append(f"{i}. {doc.filename} ({doc.file_type}): {content_preview}")
        
        return "\n".join(summary_parts)
    
    def _extract_key_topics(self, content: str) -> List[str]:
        """提取关键主题（简单的关键词提取）"""
        if not content:
            return []
        
        # 简单的中文关键词提取
        # 这里可以根据需要使用更复杂的NLP方法
        words = re.findall(r'[\u4e00-\u9fff]+', content)
        
        # 统计词频
        word_count = {}
        for word in words:
            if len(word) >= 2:  # 只考虑长度>=2的词
                word_count[word] = word_count.get(word, 0) + 1
        
        # 返回出现频率最高的前10个词
        sorted_words = sorted(word_count.items(), key=lambda x: x[1], reverse=True)
        return [word for word, count in sorted_words[:10] if count > 1]