import os
import json
from typing import List, Dict, Optional
from datetime import datetime
from docx import Document
from docx.shared import Inches
from docx.enum.text import WD_ALIGN_PARAGRAPH
from exceptions import ExportError

class Exporter:
    def __init__(self, export_folder: str = "exports"):
        self.export_folder = export_folder
        if not os.path.exists(export_folder):
            os.makedirs(export_folder)
    
    def export_to_markdown(self, query: str, generated_text: str, 
                          source_segments: List[Dict], file_name: Optional[str] = None) -> str:
        """
        Export generated text and source segments to Markdown format
        
        Args:
            query: The query used to generate the text
            generated_text: The generated text
            source_segments: List of source segments used
            file_name: Optional file name for the export
            
        Returns:
            Path to the exported file
        """
        try:
            # Generate file name if not provided
            if not file_name:
                timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
                file_name = f"生成结果_{timestamp}.md"
            
            # Create markdown content
            md_content = f"""# 文案生成结果

## 查询
{query}

## 生成文案
{generated_text}

## 源文档片段
"""
            
            for i, segment in enumerate(source_segments, 1):
                md_content += f"### 片段 {i}\n"
                md_content += f"**文件名**: {segment['metadata']['file_name']}\n\n"
                md_content += f"**段落ID**: {segment['metadata']['segment_id']}\n\n"
                md_content += f"**内容**:\n{segment['content']}\n\n"
                md_content += "---\n\n"
            
            # Write to file
            file_path = os.path.join(self.export_folder, file_name)
            with open(file_path, "w", encoding="utf-8") as f:
                f.write(md_content)
            
            return file_path
        except Exception as e:
            raise ExportError(f"导出Markdown文件失败: {str(e)}")
    
    def export_to_docx(self, query: str, generated_text: str,
                       source_segments: List[Dict], file_name: Optional[str] = None) -> str:
        """
        Export generated text and source segments to DOCX format
        
        Args:
            query: The query used to generate the text
            generated_text: The generated text
            source_segments: List of source segments used
            file_name: Optional file name for the export
            
        Returns:
            Path to the exported file
        """
        # Generate file name if not provided
        if not file_name:
            timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
            file_name = f"生成结果_{timestamp}.docx"
        
        # Create DOCX document
        doc = Document()
        
        # Add title
        title = doc.add_heading('文案生成结果', 0)
        title.alignment = WD_ALIGN_PARAGRAPH.CENTER
        
        # Add query section
        doc.add_heading('查询', level=1)
        doc.add_paragraph(query)
        
        # Add generated text section
        doc.add_heading('生成文案', level=1)
        doc.add_paragraph(generated_text)
        
        # Add source segments section
        doc.add_heading('源文档片段', level=1)
        
        for i, segment in enumerate(source_segments, 1):
            doc.add_heading(f'片段 {i}', level=2)
            doc.add_paragraph(f'文件名: {segment["metadata"]["file_name"]}')
            doc.add_paragraph(f'段落ID: {segment["metadata"]["segment_id"]}')
            doc.add_paragraph('内容:')
            doc.add_paragraph(segment['content'])
            doc.add_paragraph('---')
        
        # Save document
        file_path = os.path.join(self.export_folder, file_name)
        doc.save(file_path)
        
        return file_path
    
    def export_batch_to_markdown(self, results: List[Dict], batch_name: Optional[str] = None) -> str:
        """
        Export batch of results to Markdown format
        
        Args:
            results: List of result dictionaries
            batch_name: Optional batch name
            
        Returns:
            Path to the exported file
        """
        # Generate file name if not provided
        if not batch_name:
            timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
            batch_name = f"批量生成结果_{timestamp}.md"
        
        # Create markdown content
        md_content = f"""# 批量文案生成结果

## 生成时间
{datetime.now().strftime("%Y-%m-%d %H:%M:%S")}

## 结果列表
"""
        
        for i, result in enumerate(results, 1):
            md_content += f"## 结果 {i}\n\n"
            md_content += f"**查询**: {result.get('query', 'N/A')}\n\n"
            md_content += f"**生成文案**:\n{result.get('generated_text', 'N/A')}\n\n"
            
            # Add source segments if available
            source_segments = result.get('source_segments', [])
            if source_segments:
                md_content += "**源文档片段**:\n"
                for j, segment in enumerate(source_segments, 1):
                    md_content += f"- 片段 {j}: {segment['metadata']['segment_id']}\n"
            
            md_content += "\n---\n\n"
        
        # Write to file
        file_path = os.path.join(self.export_folder, batch_name)
        with open(file_path, "w", encoding="utf-8") as f:
            f.write(md_content)
        
        return file_path
    
    def export_batch_to_docx(self, results: List[Dict], batch_name: Optional[str] = None) -> str:
        """
        Export batch of results to DOCX format
        
        Args:
            results: List of result dictionaries
            batch_name: Optional batch name
            
        Returns:
            Path to the exported file
        """
        # Generate file name if not provided
        if not batch_name:
            timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
            batch_name = f"批量生成结果_{timestamp}.docx"
        
        # Create DOCX document
        doc = Document()
        
        # Add title
        title = doc.add_heading('批量文案生成结果', 0)
        title.alignment = WD_ALIGN_PARAGRAPH.CENTER
        
        # Add generation time
        doc.add_heading('生成时间', level=1)
        doc.add_paragraph(datetime.now().strftime("%Y-%m-%d %H:%M:%S"))
        
        # Add results list
        doc.add_heading('结果列表', level=1)
        
        for i, result in enumerate(results, 1):
            doc.add_heading(f'结果 {i}', level=2)
            doc.add_paragraph(f'查询: {result.get("query", "N/A")}')
            
            # Add generated text
            generated_text = result.get('generated_text', 'N/A')
            doc.add_paragraph('生成文案:')
            doc.add_paragraph(generated_text)
            
            # Add source segments if available
            source_segments = result.get('source_segments', [])
            if source_segments:
                doc.add_paragraph('源文档片段:')
                for j, segment in enumerate(source_segments, 1):
                    paragraph = doc.add_paragraph()
                    paragraph.add_run(f'片段 {j}: ').bold = True
                    paragraph.add_run(f'{segment["metadata"]["segment_id"]}')
            
            # Add separator
            doc.add_paragraph('---')
        
        # Save document
        file_path = os.path.join(self.export_folder, batch_name)
        doc.save(file_path)
        
        return file_path