import openai
from PyPDF2 import PdfReader
import fitz
import os

class HeadingsExtractor:

    def __init__(self):
        """
        Extract headings from a given paragraph using OpenAI's GPT-3.

        Args:
            contract_page (str): The paragraph from which headings need to be extracted.

        Returns:
            str: Extracted headings.
        """
        pass

    def extarct_headings(self,contract_page: str) -> str:

        """
        Extract headings from a given paragraph using OpenAI's GPT-3.

        Args:
            contract_page (str): The paragraph from which headings need to be extracted.

        Returns:
            str: Extracted headings.
        """
        try:
            #get response from openai api
            response = openai.Completion.create(
                engine="text-davinci-003",
                prompt=f"""Extract Headings from given paragraph do not generate jsu extract the headings from paragraph.
                        ```paragraph :{contract_page}```""",
                max_tokens=100,
                temperature=0
            )
            headings = response.choices[0].text.strip()
            return headings

        except Exception as e:
            # If an error occurs during the key-value extraction process, log the error
            print(f"Error while extracting headings: {str(e)}")

    def extarct_text(self,pdf_file_path: str) -> str:

        """
        Extract text from a PDF document and extract headings from each page.

        Args:
            pdf_file_path (str): Path to the PDF file to extract text from.

        Returns:
            str: Extracted headings from the PDF document.
        """
        try:
            # Open the multi-page PDF using PdfReader

            print("path",pdf_file_path)
            pdf = PdfReader(pdf_file_path.name)
            headings = ''
            # Extract text from each page and pass it to the process_text function
            for page_number in range(len(pdf.pages)):
                # Extract text from the page
                page = pdf.pages[page_number]
                text = page.extract_text()

                # Pass the text to the process_text function for further processing
                result = self.extarct_headings(text)
                headings = headings + result
            return headings

        except Exception as e:
            # If an error occurs during the key-value extraction process, log the error
            print(f"Error while extracting text from PDF: {str(e)}")