#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Dots OCR PDF 解析器
使用 Dots OCR 解析 PDF 文档，并转换为 MinerU 兼容格式
"""

import os
import time
import json
import re
import sys
import io
import aiohttp
# import fitz  # PyMuPDF
from PIL import Image
from utils.upload_file_to_oss import UploadMinio
from config import minio_config, dots_ocr_config, model_name_vllm_url_dict
from utils.get_logger import setup_logger

# 添加 dots.ocr 到 Python 路径
dots_ocr_path = os.path.join(os.path.dirname(__file__), '../../dots.ocr-master')
if os.path.exists(dots_ocr_path):
    sys.path.insert(0, dots_ocr_path)

try:
    from dots_ocr.parser import DotsOCRParser
except ImportError as e:
    raise ImportError(f"无法导入 DotsOCRParser: {e}")

logger = setup_logger(__name__)

class DotsPDFLoader:
    pass


class DotsPDFLoaders:
    """Dots OCR PDF 解析器"""
    
    def __init__(self, file_json):
        self.file_json = file_json
        self.knowledge_id = file_json.get("knowledge_id")
        self.document_id = None  # 将在 extract_text 中设置
        self.set_table = file_json.get("set_table", "1")
        self.upload_minio = UploadMinio()
        
        # 初始化 Dots OCR Parser
        self.parser = DotsOCRParser(
            protocol=dots_ocr_config.get("protocol", "http"),
            ip=dots_ocr_config.get("ip", "localhost"),
            port=dots_ocr_config.get("port", 8000),
            model_name=dots_ocr_config.get("model_name", "model"),
            temperature=dots_ocr_config.get("temperature", 0.1),
            top_p=dots_ocr_config.get("top_p", 1.0),
            num_thread=dots_ocr_config.get("num_thread", 64),
            dpi=dots_ocr_config.get("dpi", 200),
            output_dir=dots_ocr_config.get("output_dir", "./tmp_file/dots_parsed")
        )
        
        logger.info(f"Dots OCR Parser 初始化成功")
    
    async def extract_text(self, pdf_path, doc_id=None):
        """解析 PDF 文件"""
        # 设置 document_id
        self.document_id = doc_id
        logger.info(f"开始使用 Dots OCR 解析 PDF: {pdf_path}, doc_id: {doc_id}")
        
        try:
            pdf_file_name = os.path.splitext(os.path.basename(pdf_path))[0] + time.strftime("_%Y%m%d%H%M%S")
            results = self.parser.parse_file(pdf_path, prompt_mode="prompt_layout_all_en", save_dirname=pdf_file_name)
            
            if not results:
                raise ValueError("Dots OCR 解析返回空结果")
            
            logger.info(f"Dots OCR 解析完成，共 {len(results)} 页")
            
            content_list = []
            all_md_contents = []
            image_num = 1
            
            for page_idx, result in enumerate(results):
                layout_info_path = result.get('layout_info_path')
                if not layout_info_path or not os.path.exists(layout_info_path):
                    continue
                
                # 读取并验证 JSON
                with open(layout_info_path, 'r', encoding='utf-8') as f:
                    raw_content = f.read()
                
                layout_data = await self._validate_and_fix_json(raw_content, page_idx)
                if not layout_data:
                    logger.warning(f"第 {page_idx + 1} 页 JSON 验证失败，跳过")
                    continue
                
                md_content_path = result.get('md_content_path')
                if md_content_path and os.path.exists(md_content_path):
                    with open(md_content_path, 'r', encoding='utf-8') as f:
                        all_md_contents.append(f.read())
                
                page_content, image_num = self._process_layout_data(
                    layout_data, pdf_path, page_idx, image_num, pdf_file_name
                )
                content_list.extend(page_content)
            
            merged_md_path = self._merge_md_files(all_md_contents)
            
            logger.info(f"Dots OCR 解析完成，共 {len(content_list)} 个元素")
            return content_list, merged_md_path, pdf_file_name
            
        except Exception as e:
            logger.error(f"Dots OCR 解析失败: {e}", exc_info=True)
            raise
    
    async def _validate_and_fix_json(self, raw_content, page_idx):
        """验证JSON并在需要时使用LLM修复"""
        # 第一次尝试：直接解析
        try:
            data = json.loads(raw_content)
            # 验证是否是列表且元素是字典
            if isinstance(data, list):
                # 过滤掉非字典元素
                valid_data = [item for item in data if isinstance(item, dict)]
                if len(valid_data) < len(data):
                    logger.warning(f"第 {page_idx + 1} 页 JSON 包含 {len(data) - len(valid_data)} 个非字典元素，已过滤")
                return valid_data
            else:
                logger.warning(f"第 {page_idx + 1} 页 JSON 不是列表格式")
                return None
        except json.JSONDecodeError as e:
            logger.warning(f"第 {page_idx + 1} 页 JSON 解析失败: {e}，尝试使用 LLM 修复")
        
        # 第二次尝试：使用 LLM 修复
        try:
            fixed_json = await self._fix_json_with_llm(raw_content)
            if fixed_json:
                data = json.loads(fixed_json)
                if isinstance(data, list):
                    valid_data = [item for item in data if isinstance(item, dict)]
                    logger.info(f"第 {page_idx + 1} 页 JSON 经 LLM 修复成功")
                    return valid_data
        except Exception as e:
            logger.error(f"第 {page_idx + 1} 页 LLM 修复失败: {e}")
        
        # 最终失败，跳过该页
        logger.error(f"第 {page_idx + 1} 页 JSON 无法修复，跳过")
        return None
    
    async def _fix_json_with_llm(self, raw_content):
        """使用 LLM 修复非法 JSON"""
        try:
            # 获取 LLM 配置
            model_name = "Qwen3-Coder-30B-loft"
            base_url = model_name_vllm_url_dict.get(model_name)
            
            if not base_url:
                logger.error("未找到 LLM 配置")
                return None
            
            prompt = f"""你是一个JSON修复专家。下面的JSON数据可能格式错误，请修复它并返回合法的JSON数组。
要求：
1. 返回的必须是一个JSON数组（列表）
2. 数组中的每个元素必须是一个字典对象
3. 如果某个元素不是字典，请移除它
4. 只返回修复后的JSON，不要有任何其他说明文字

原始数据：
{raw_content[:2000]}

请直接返回修复后的合法JSON："""

            headers = {
                "Content-Type": "application/json",
                "Authorization": f"Bearer {os.getenv('DEEPSEEK_API_KEY', 'sk-dummy')}"
            }
            
            payload = {
                "model": model_name,
                "messages": [{"role": "user", "content": prompt}],
                "temperature": 0.1,
                "max_tokens": 4096
            }
            
            async with aiohttp.ClientSession() as session:
                async with session.post(
                    f"{base_url}/chat/completions",
                    json=payload,
                    headers=headers,
                    timeout=aiohttp.ClientTimeout(total=30)
                ) as resp:
                    if resp.status == 200:
                        result = await resp.json()
                        fixed_json = result.get("choices", [{}])[0].get("message", {}).get("content", "")
                        # 提取JSON部分（去除markdown标记）
                        fixed_json = re.sub(r'^```json\s*', '', fixed_json, flags=re.MULTILINE)
                        fixed_json = re.sub(r'\s*```$', '', fixed_json, flags=re.MULTILINE)
                        return fixed_json.strip()
                    else:
                        logger.error(f"LLM API 调用失败: {resp.status}")
                        return None
        except Exception as e:
            logger.error(f"LLM 修复 JSON 异常: {e}")
            return None
    
    def _extract_text_level(self, text):
        """从文本中提取 text_level（通过计算开头的 # 号数量）"""
        if not text:
            return None, text
        
        match = re.match(r'^(#{1,6})\s+(.+)', text)
        if match:
            level = len(match.group(1))
            clean_text = match.group(2)
            return level, clean_text
        
        return None, text
    
    def _crop_and_upload_image(self, page, bbox, image_num, category="image", pdf_file_name=""):
        """裁剪图片并上传到 minio"""
        try:
            # 验证 bbox 有效性
            if not bbox or len(bbox) != 4:
                logger.warning(f"无效的 bbox: {bbox}")
                return None, None, None
            
            x1, y1, x2, y2 = bbox
            
            # 检查坐标有效性
            page_rect = page.rect
            if x1 < 0 or y1 < 0 or x2 > page_rect.width or y2 > page_rect.height:
                logger.warning(f"bbox 超出页面范围: {bbox}, 页面大小: {page_rect.width}x{page_rect.height}")
                # 裁剪到页面范围内
                x1 = max(0, x1)
                y1 = max(0, y1)
                x2 = min(page_rect.width, x2)
                y2 = min(page_rect.height, y2)
            
            # 检查尺寸是否有效
            if x2 <= x1 or y2 <= y1:
                logger.warning(f"无效的 bbox 尺寸: {bbox}")
                return None, None, None
            
            # 使用 PyMuPDF 裁剪区域
            import fitz
            rect = fitz.Rect(x1, y1, x2, y2)
            pix = page.get_pixmap(clip=rect, dpi=150)  # 降低 dpi 
            
            # 转换为 PIL Image
            img_data = pix.tobytes("png")
            image = Image.open(io.BytesIO(img_data))
            
            # 保存临时文件
            temp_dir = f"./tmp_file/dots_parsed/{pdf_file_name}/images"
            os.makedirs(temp_dir, exist_ok=True)
            temp_img_path = f"{temp_dir}/{self.document_id}_{image_num}.jpg"
            image.save(temp_img_path, "JPEG")
            
            # 生成标识符（包含 doc_id）
            replace_text = f"【示意图序号_{self.document_id}_{image_num}】"
            
            # 上传到 minio
            minio_file_path = f"/pdf/{self.knowledge_id}/{self.document_id}/{replace_text}.jpg"
            self.upload_minio.upload_file(temp_img_path, minio_file_path)
            
            # 生成完整 URL
            minio_url = minio_config.get("minio_url")
            minio_bucket = minio_config.get("minio_bucket")
            full_url = f"{minio_url}/{minio_bucket}{minio_file_path}"
            
            logger.info(f"图片上传成功: {replace_text}")
            
            return replace_text, full_url, temp_img_path
            
        except Exception as e:
            logger.error(f"裁剪或上传图片失败: {e}")
            return None, None, None
    
    def _process_layout_data(self, layout_data, pdf_path, page_idx, image_num, pdf_file_name):
        """处理单页布局数据，转换为 MinerU 兼容格式"""
        content = []
        
        import fitz
        # 打开 PDF 页面
        pdf_doc = fitz.open(pdf_path)
        page = pdf_doc[page_idx]
        
        for cell in layout_data:
            category = cell.get('category')
            text = cell.get('text', '')
            bbox = cell.get('bbox', [])
            
            if category == 'Title':
                # Title 固定为 level 1
                _, clean_text = self._extract_text_level(text)
                content.append({
                    "type": "text",
                    "text": clean_text or text,
                    "text_level": 1,
                    "page_idx": page_idx
                })
                
            elif category == 'Section-header':
                # 从文本中提取 # 号数量
                text_level, clean_text = self._extract_text_level(text)
                content.append({
                    "type": "text",
                    "text": clean_text,
                    "text_level": text_level,
                    "page_idx": page_idx
                })
                
            elif category == 'Picture':
                # 裁剪图片并上传
                replace_text, full_url, img_path = self._crop_and_upload_image(
                    page, bbox, image_num, "image", pdf_file_name
                )
                
                if replace_text:
                    content.append({
                        "type": "image",
                        "img_path": f"images/{self.document_id}_{image_num}.jpg",
                        "page_idx": page_idx,
                        "replace_text": replace_text
                    })
                    image_num += 1
                    
            elif category == 'Table':
                # 表格处理：根据 set_table 模式
                if self.set_table == "0":
                    # 图片模式：裁剪表格图片
                    replace_text, full_url, img_path = self._crop_and_upload_image(
                        page, bbox, image_num, "table", pdf_file_name
                    )
                    
                    if replace_text:
                        content.append({
                            "type": "table",
                            "img_path": f"images/{self.document_id}_{image_num}.jpg",
                            "table_body": replace_text,
                            "table_caption": [],
                            "page_idx": page_idx
                        })
                        image_num += 1
                else:
                    # HTML 模式：直接使用 text
                    content.append({
                        "type": "table",
                        "table_body": text,
                        "table_caption": [],
                        "page_idx": page_idx
                    })
                    
            elif category == 'List-item':
                # 列表项
                list_items = text.split('\n') if text else []
                content.append({
                    "type": "list",
                    "list_items": list_items,
                    "page_idx": page_idx
                })
                
            elif category in ['Text', 'Caption', 'Footnote', 'Formula', 'Page-header', 'Page-footer']:
                # 普通文本处理
                content.append({
                    "type": "text",
                    "text": text,
                    "text_level": None,
                    "page_idx": page_idx
                })
        
        pdf_doc.close()
        return content, image_num
    
    def _merge_md_files(self, md_contents):
        """合并多个 MD 文件为一个"""
        if not md_contents:
            logger.warning("没有 MD 文件可合并")
            return ""
        
        # 在页与页之间插入分隔符
        merged_content = "\n\n<page>\n\n".join(md_contents)
        
        # 保存合并后的文件
        output_dir = dots_ocr_config.get("output_dir", "./tmp_file/dots_parsed")
        os.makedirs(output_dir, exist_ok=True)
        merged_path = os.path.join(output_dir, f"{self.document_id}_merged.md")
        
        with open(merged_path, 'w', encoding='utf-8') as f:
            f.write(merged_content)
        
        logger.info(f"MD 文件合并完成: {merged_path}")
        return merged_path