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"""
File manager helper to work with uploaded files.
"""
import logging
import os
import sys
import streamlit as st
from pypdf import PdfReader
sys.path.append('..')
sys.path.append('../..')
from global_config import GlobalConfig
logger = logging.getLogger(__name__)
def get_pdf_contents(
pdf_file: st.runtime.uploaded_file_manager.UploadedFile,
page_range: tuple[int, int],
max_pages: int = GlobalConfig.MAX_PAGE_COUNT
) -> str:
"""
Extract the text contents from a PDF file.
:param pdf_file: The uploaded PDF file.
:param page_range: The range of pages to extract contents from.
:param max_pages: The max no. of pages to extract contents from.
:return: The contents.
"""
reader = PdfReader(pdf_file)
# get number of pages
total_pages = len(reader.pages)
n_pages = min(max_pages, total_pages) # set n_pages to min of 50 or the pdf length if the pdf is shorter than 50 pages
# ensure validity
start, end = page_range # set start and end per the range (user-specified values)
start = max(1, start) # set start to max of 1, or user-spec start
end = min(n_pages, end) # set end to min of n_pages, or user-spec end
logger.info(f"start={start}")
logger.info(f"end={end}")
text = ''
for page_num in range(start - 1, end):
page = reader.pages[page_num]
text += page.extract_text()
return text
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