"""
Markdown 生成器模块

提供 Markdown 输出功能：
- 完整文档 Markdown 生成
- 按页 Markdown 生成
- MinerU union_make 集成
"""
import sys
from pathlib import Path
from typing import Dict, Any, List
from loguru import logger

# 导入 MinerU 组件
mineru_path = Path(__file__).parents[3]
if str(mineru_path) not in sys.path:
    sys.path.insert(0, str(mineru_path))

try:
    from mineru.backend.vlm.vlm_middle_json_mkcontent import union_make as vlm_union_make
    from mineru.utils.enum_class import MakeMode
    MINERU_AVAILABLE = True
except ImportError:
    MINERU_AVAILABLE = False
    vlm_union_make = None
    
    class MakeMode:
        MM_MD = 'mm_md'
        NLP_MD = 'nlp_md'


class MarkdownGenerator:
    """Markdown 生成器类"""
    
    @staticmethod
    def save_markdown(
        results: Dict[str, Any],
        middle_json: Dict[str, Any],
        output_dir: Path,
        doc_name: str,
        use_mineru_union: bool = False
    ) -> Path:
        """
        保存 Markdown 文件
        
        默认使用自定义实现，确保所有元素类型（包括 table_caption 等）都被正确处理
        可选使用 MinerU union_make（但它不处理 table_caption 等独立元素）
        
        Args:
            results: 处理结果
            middle_json: middle.json 格式数据
            output_dir: 输出目录
            doc_name: 文档名称
            use_mineru_union: 是否使用 MinerU union_make（默认 False）
            
        Returns:
            Markdown 文件路径
        """
        md_path = output_dir / f"{doc_name}.md"
        
        if use_mineru_union and MINERU_AVAILABLE and vlm_union_make is not None:
            try:
                img_bucket_path = "images"
                markdown_content = vlm_union_make(
                    middle_json['pdf_info'],
                    MakeMode.MM_MD,
                    img_bucket_path
                )
                
                if markdown_content:
                    if isinstance(markdown_content, list):
                        markdown_content = '\n\n'.join(markdown_content)
                    
                    header = MarkdownGenerator._generate_header(results)
                    markdown_content = header + str(markdown_content)
                    
                    with open(md_path, 'w', encoding='utf-8') as f:
                        f.write(markdown_content)
                    
                    logger.info(f"📝 Markdown saved (MinerU format): {md_path}")
                    return md_path
                    
            except Exception as e:
                logger.warning(f"MinerU union_make failed: {e}, falling back to custom implementation")
        
        # 使用自定义实现，确保所有元素类型都被处理
        markdown_content = MarkdownGenerator._generate_full_markdown(results)
        with open(md_path, 'w', encoding='utf-8') as f:
            f.write(markdown_content)
        
        logger.info(f"📝 Markdown saved (custom format): {md_path}")
        return md_path
    
    @staticmethod
    def save_page_markdowns(
        results: Dict[str, Any],
        output_dir: Path,
        doc_name: str
    ) -> List[str]:
        """
        按页保存 Markdown 文件
        
        Args:
            results: 处理结果
            output_dir: 输出目录
            doc_name: 文档名称
            
        Returns:
            保存的 Markdown 文件路径列表
        """
        saved_paths = []
        
        for page in results.get('pages', []):
            page_idx = page.get('page_idx', 0)
            page_name = f"{doc_name}_page_{page_idx + 1:03d}"
            
            # 生成单页 Markdown
            md_content = MarkdownGenerator._generate_page_markdown(page, doc_name, page_idx)
            
            # 保存
            md_path = output_dir / f"{page_name}.md"
            with open(md_path, 'w', encoding='utf-8') as f:
                f.write(md_content)
            
            saved_paths.append(str(md_path))
            logger.debug(f"📝 Page Markdown saved: {md_path}")
        
        if saved_paths:
            logger.info(f"📝 {len(saved_paths)} page Markdowns saved")
        
        return saved_paths
    
    @staticmethod
    def _generate_header(results: Dict[str, Any]) -> str:
        """生成 Markdown 文件头"""
        return f"""---
scene: {results.get('scene', 'unknown')}
document: {results.get('document_path', '')}
pages: {len(results.get('pages', []))}
---

"""
    
    @staticmethod
    def _generate_full_markdown(results: Dict[str, Any]) -> str:
        """
        生成完整文档的 Markdown（自定义实现）
        
        确保所有元素类型都被正确处理，包括 table_caption、table_footnote 等
        
        Args:
            results: 处理结果
            
        Returns:
            Markdown 内容字符串
        """
        md_lines = [
            f"---",
            f"scene: {results.get('scene', 'unknown')}",
            f"document: {results.get('document_path', '')}",
            f"pages: {len(results.get('pages', []))}",
            f"---",
            "",
        ]
        
        for page in results.get('pages', []):
            # 按阅读顺序处理元素
            for element in page.get('elements', []):
                elem_type = element.get('type', '')
                content = element.get('content', {})
                
                if elem_type == 'title':
                    text = content.get('text', '') if isinstance(content, dict) else str(content)
                    level = element.get('level', 1)
                    if text:
                        md_lines.append(f"{'#' * min(level, 6)} {text}")
                        md_lines.append("")
                
                elif elem_type in ['text', 'ocr_text', 'ref_text']:
                    text = content.get('text', '') if isinstance(content, dict) else str(content)
                    if text:
                        md_lines.append(text)
                        md_lines.append("")
                
                elif elem_type in ['table', 'table_body']:
                    html = content.get('html', '')
                    if html:
                        md_lines.append(f"\n{html}\n")
                        md_lines.append("")
                
                elif elem_type in ['image', 'image_body', 'figure']:
                    img_filename = content.get('image_path', '')
                    if img_filename:
                        md_lines.append(f"![](images/{img_filename})")
                        md_lines.append("")
                
                elif elem_type in ['interline_equation', 'inline_equation', 'equation']:
                    latex = content.get('latex', '')
                    if latex:
                        md_lines.append(f"$$\n{latex}\n$$")
                        md_lines.append("")
                
                elif elem_type in ['table_caption', 'table_footnote']:
                    text = content.get('text', '') if isinstance(content, dict) else str(content)
                    if text:
                        if elem_type == 'table_caption':
                            md_lines.append(f"**{text}**")
                        else:
                            md_lines.append(f"*{text}*")
                        md_lines.append("")
                
                elif elem_type in ['image_caption', 'image_footnote']:
                    text = content.get('text', '') if isinstance(content, dict) else str(content)
                    if text:
                        if elem_type == 'image_caption':
                            md_lines.append(f"**{text}**")
                        else:
                            md_lines.append(f"*{text}*")
                        md_lines.append("")
        
        return '\n'.join(md_lines)
    
    @staticmethod
    def _generate_fallback(results: Dict[str, Any]) -> str:
        """降级方案：自定义 Markdown 生成"""
        md_lines = [
            f"---",
            f"scene: {results.get('scene', 'unknown')}",
            f"document: {results.get('document_path', '')}",
            f"pages: {len(results.get('pages', []))}",
            f"---",
            "",
        ]
        
        for page in results.get('pages', []):
            for element in page.get('elements', []):
                elem_type = element.get('type', '')
                content = element.get('content', {})
                bbox = element.get('bbox', [])
                
                # 添加 bbox 注释
                if bbox:
                    md_lines.append(f"<!-- bbox: {bbox} -->")
                
                if elem_type == 'title':
                    text = content.get('text', '') if isinstance(content, dict) else str(content)
                    level = element.get('level', 1)
                    md_lines.append(f"{'#' * min(level, 6)} {text}")
                    md_lines.append("")
                
                elif elem_type in ['text', 'ocr_text', 'ref_text']:
                    text = content.get('text', '') if isinstance(content, dict) else str(content)
                    if text:
                        md_lines.append(text)
                        md_lines.append("")
                
                elif elem_type in ['table', 'table_body']:
                    # 表格标题
                    table_captions = content.get('table_caption', [])
                    if isinstance(table_captions, str):
                        table_captions = [table_captions] if table_captions else []
                    for caption in table_captions:
                        md_lines.append(f"**{caption}**")
                    
                    html = content.get('html', '')
                    if html:
                        md_lines.append(f"\n{html}\n")
                    md_lines.append("")
                
                elif elem_type in ['image', 'image_body', 'figure']:
                    img_filename = content.get('image_path', '')
                    if img_filename:
                        md_lines.append(f"![](images/{img_filename})")
                        md_lines.append("")
                
                elif elem_type in ['interline_equation', 'inline_equation', 'equation']:
                    latex = content.get('latex', '')
                    if latex:
                        md_lines.append(f"$$\n{latex}\n$$")
                        md_lines.append("")
                
                elif elem_type in ['table_caption', 'table_footnote']:
                    text = content.get('text', '') if isinstance(content, dict) else str(content)
                    if text:
                        if elem_type == 'table_caption':
                            md_lines.append(f"**{text}**")
                        else:
                            md_lines.append(f"*{text}*")
                        md_lines.append("")
                
                elif elem_type in ['image_caption', 'image_footnote']:
                    text = content.get('text', '') if isinstance(content, dict) else str(content)
                    if text:
                        if elem_type == 'image_caption':
                            md_lines.append(f"**{text}**")
                        else:
                            md_lines.append(f"*{text}*")
                        md_lines.append("")
        
        return '\n'.join(md_lines)
    
    @staticmethod
    def _generate_page_markdown(
        page: Dict[str, Any],
        doc_name: str,
        page_idx: int
    ) -> str:
        """
        生成单页的 Markdown 内容
        
        Args:
            page: 页面数据
            doc_name: 文档名称
            page_idx: 页码索引
            
        Returns:
            Markdown 内容字符串
        """
        md_lines = [
            f"---",
            f"document: {doc_name}",
            f"page: {page_idx + 1}",
            f"angle: {page.get('angle', 0)}",
            f"---",
            "",
        ]
        
        for element in page.get('elements', []):
            elem_type = element.get('type', '')
            content = element.get('content', {})
            bbox = element.get('bbox', [])
            reading_order = element.get('reading_order', 0)
            
            # 添加元素注释
            md_lines.append(f"<!-- reading_order: {reading_order}, bbox: {bbox} -->")
            
            if elem_type == 'title':
                text = content.get('text', '') if isinstance(content, dict) else str(content)
                level = element.get('level', 1)
                md_lines.append(f"{'#' * min(level, 6)} {text}")
                md_lines.append("")
            
            elif elem_type in ['text', 'ocr_text', 'ref_text']:
                text = content.get('text', '') if isinstance(content, dict) else str(content)
                if text:
                    md_lines.append(text)
                    md_lines.append("")
            
            elif elem_type in ['table', 'table_body']:
                table_captions = content.get('table_caption', [])
                if isinstance(table_captions, str):
                    table_captions = [table_captions] if table_captions else []
                for caption in table_captions:
                    md_lines.append(f"**{caption}**")
                
                html = content.get('html', '')
                if html:
                    md_lines.append(f"\n{html}\n")
                md_lines.append("")
            
            elif elem_type in ['image', 'image_body', 'figure']:
                img_filename = content.get('image_path', '')
                if img_filename:
                    md_lines.append(f"![](images/{img_filename})")
                    md_lines.append("")
            
            elif elem_type in ['interline_equation', 'inline_equation', 'equation']:
                latex = content.get('latex', '')
                if latex:
                    md_lines.append(f"$$\n{latex}\n$$")
                    md_lines.append("")
            
            elif elem_type in ['table_caption', 'table_footnote']:
                text = content.get('text', '') if isinstance(content, dict) else str(content)
                if text:
                    # 表格标题加粗，表格脚注斜体
                    if elem_type == 'table_caption':
                        md_lines.append(f"**{text}**")
                    else:
                        md_lines.append(f"*{text}*")
                    md_lines.append("")
            
            elif elem_type in ['image_caption', 'image_footnote']:
                text = content.get('text', '') if isinstance(content, dict) else str(content)
                if text:
                    # 图片标题加粗，图片脚注斜体
                    if elem_type == 'image_caption':
                        md_lines.append(f"**{text}**")
                    else:
                        md_lines.append(f"*{text}*")
                    md_lines.append("")
            
            elif elem_type == 'discarded':
                text = content.get('text', '') if isinstance(content, dict) else ''
                if text:
                    md_lines.append(f"<!-- [discarded: {element.get('original_category', 'unknown')}] {text} -->")
                    md_lines.append("")
        
        # 处理丢弃元素
        for element in page.get('discarded_blocks', []):
            content = element.get('content', {})
            bbox = element.get('bbox', [])
            reading_order = element.get('reading_order', 0)
            original_category = element.get('original_category', 'unknown')
            
            md_lines.append(f"<!-- reading_order: {reading_order}, bbox: {bbox} -->")
            text = content.get('text', '') if isinstance(content, dict) else ''
            if text:
                md_lines.append(f"<!-- [discarded: {original_category}] {text} -->")
            else:
                md_lines.append(f"<!-- [discarded: {original_category}] (no text) -->")
            md_lines.append("")
        
        return '\n'.join(md_lines)