main.py

import os
import json
import time
import logging
from pathlib import Path
from typing import List, Dict, Optional
from dataclasses import dataclass, asdict

from magic_pdf.data.data_reader_writer import FileBasedDataWriter, FileBasedDataReader
from magic_pdf.data.dataset import PymuDocDataset
from magic_pdf.model.doc_analyze_by_custom_model import doc_analyze
from magic_pdf.config.enums import SupportedPdfParseMethod
from sentence_transformers import SentenceTransformer
from llama_cpp import Llama
from fastapi.encoders import jsonable_encoder

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

@dataclass
class ProductSpec:
    name: str
    description: Optional[str] = None
    price: Optional[float] = None
    attributes: Dict[str, str] = None
    tables: List[Dict] = None

    def to_dict(self):
        return jsonable_encoder(self)

class PDFProcessor:
    def __init__(self):
        self.emb_model = SentenceTransformer('all-MiniLM-L6-v2')
        self.llm = self._initialize_llm()
        self.output_dir = Path("./output")
        self.output_dir.mkdir(exist_ok=True)
        
    def _initialize_llm(self):
        """Initialize LLM with automatic download if needed"""
        return Llama.from_pretrained(
            repo_id="TheBloke/deepseek-1.3B-GGUF",
            filename="deepseek-1.3b.Q5_K_M.gguf",
            n_ctx=2048,
            n_threads=os.cpu_count() - 1,
            n_gpu_layers=35 if os.getenv('USE_GPU') else 0,
            verbose=False
        )
    
    def process_pdf(self, pdf_path: str) -> Dict:
        """Process PDF using MinerU pipeline"""
        start_time = time.time()
        
        # Initialize MinerU components
        local_image_dir = self.output_dir / "images"
        local_md_dir = self.output_dir
        image_dir = str(local_image_dir.name)
        
        os.makedirs(local_image_dir, exist_ok=True)
        
        image_writer = FileBasedDataWriter(str(local_image_dir))
        md_writer = FileBasedDataWriter(str(local_md_dir))
        
        # Read PDF
        reader = FileBasedDataReader("")
        pdf_bytes = reader.read(pdf_path)
        
        # Create dataset and process
        ds = PymuDocDataset(pdf_bytes)
        
        if ds.classify() == SupportedPdfParseMethod.OCR:
            infer_result = ds.apply(doc_analyze, ocr=True)
            pipe_result = infer_result.pipe_ocr_mode(image_writer)
        else:
            infer_result = ds.apply(doc_analyze, ocr=False)
            pipe_result = infer_result.pipe_txt_mode(image_writer)
        
        # Get structured content
        middle_json = pipe_result.get_middle_json()
        tables = self._extract_tables(middle_json)
        text_blocks = self._extract_text_blocks(middle_json)
        
        # Process text blocks with LLM
        products = []
        for block in text_blocks:
            product = self._process_text_block(block)
            if product:
                product.tables = tables
                products.append(product.to_dict())
        
        logger.info(f"Processed {len(products)} products in {time.time()-start_time:.2f}s")
        return {"products": products, "tables": tables}

    def _extract_tables(self, middle_json: Dict) -> List[Dict]:
        """Extract tables from MinerU's middle JSON"""
        tables = []
        for page in middle_json.get('pages', []):
            for table in page.get('tables', []):
                tables.append({
                    "page": page.get('page_number'),
                    "cells": table.get('cells', []),
                    "header": table.get('header', []),
                    "content": table.get('content', [])
                })
        return tables

    def _extract_text_blocks(self, middle_json: Dict) -> List[str]:
        """Extract text blocks from MinerU's middle JSON"""
        text_blocks = []
        for page in middle_json.get('pages', []):
            for block in page.get('blocks', []):
                if block.get('type') == 'text':
                    text_blocks.append(block.get('text', ''))
        return text_blocks

    def _process_text_block(self, text: str) -> Optional[ProductSpec]:
        """Process text block with LLM"""
        prompt = self._generate_query_prompt(text)
        
        try:
            response = self.llm.create_chat_completion(
                messages=[{"role": "user", "content": prompt}],
                temperature=0.1,
                max_tokens=512
            )
            return self._parse_response(response['choices'][0]['message']['content'])
        except Exception as e:
            logger.warning(f"Error processing text block: {e}")
            return None

    def _generate_query_prompt(self, text: str) -> str:
        """Generate extraction prompt"""
        return f"""Extract product specifications from this text:
{text}

Return JSON format:
{{
    "name": "product name",
    "description": "product description",
    "price": numeric_price,
    "attributes": {{ "key": "value" }}
}}"""

    def _parse_response(self, response: str) -> Optional[ProductSpec]:
        """Parse LLM response"""
        try:
            json_start = response.find('{')
            json_end = response.rfind('}') + 1
            data = json.loads(response[json_start:json_end])
            return ProductSpec(
                name=data.get('name', ''),
                description=data.get('description'),
                price=data.get('price'),
                attributes=data.get('attributes', {})
            )
        except (json.JSONDecodeError, KeyError) as e:
            logger.warning(f"Parse error: {e}")
            return None

def process_pdf_catalog(pdf_path: str):
    processor = PDFProcessor()
    try:
        result = processor.process_pdf(pdf_path)
        return result, "Processing completed successfully!"
    except Exception as e:
        logger.error(f"Processing failed: {e}")
        return {}, "Error processing PDF"