Workingapp.py

import os
#os.environ["PATH"] += os.pathsep + "/usr/bin" + os.pathsep + "/usr/local/bin" #Removed redundant path setting
print(f"Current PATH: {os.environ['PATH']}")
import streamlit as st
from PyPDF2 import PdfMerger
from google.cloud import vision
from google.oauth2 import service_account
import fitz
from PIL import Image
from io import BytesIO
import tempfile
import json
from streamlit_sortables import sort_items
import subprocess
from tqdm import tqdm
from datetime import datetime

# Check if /usr/bin/pdfinfo exists
if os.path.exists("/usr/bin/pdfinfo"):
    print("pdfinfo exists at /usr/bin/pdfinfo")
    # Check the file permissions
    permissions = os.stat("/usr/bin/pdfinfo").st_mode
    print(f"File permissions: {oct(permissions)}")
else:
    print("pdfinfo does not exist at /usr/bin/pdfinfo")


# Load Google Cloud Vision credentials from secret
credentials_json = os.getenv("GOOGLE_CREDENTIALS_JSON")
if credentials_json:
    credentials_dict = json.loads(credentials_json)
    credentials = service_account.Credentials.from_service_account_info(credentials_dict)
    client = vision.ImageAnnotatorClient(credentials=credentials)
else:
    client = None

# Function to extract text using Google Cloud Vision
def extract_text_with_google_vision(image_bytes):
    """Extracts text using Google Cloud Vision."""
    image = vision.Image(content=image_bytes)
    response = client.document_text_detection(image=image)
    if response.error.message:
        raise Exception(f"Google Cloud Vision API Error: {response.error.message}")
    return response.full_text_annotation.text if response.full_text_annotation else ""

# Function to process PDF for transcription
def process_pdf(file):
    """Converts PDF pages to images and extracts text."""
    text = ""
    with tempfile.NamedTemporaryFile(suffix=".pdf", delete=False) as temp_pdf:
        temp_pdf.write(file.read())
        temp_pdf_path = temp_pdf.name

    try:
        doc = fitz.open(temp_pdf_path)
        for i in tqdm(range(len(doc)), desc="Processing pages"):
            page = doc.load_page(i)
            pix = page.get_pixmap()
            image = Image.frombytes("RGB", [pix.width, pix.height], pix.samples)
            image_bytes = BytesIO()
            image.save(image_bytes, format="PNG")
            image_bytes.seek(0)
            try:
                page_text = extract_text_with_google_vision(image_bytes.getvalue())
                text += f"--- Page {i + 1} ---\n{page_text}\n\n"
            except Exception as e:
                st.error(f"Error on page {i + 1}: {e}")
    finally:
        os.remove(temp_pdf_path)

    with tempfile.NamedTemporaryFile(suffix=".txt", delete=False) as temp_txt:
      temp_txt.write(text.encode("utf-8"))
      temp_txt_path = temp_txt.name
    return temp_txt_path


# Function to generate thumbnail from PDF
def get_pdf_thumbnail(uploaded_file):
    """Generates a thumbnail image of the first page of a PDF."""
    uploaded_file.seek(0)
    doc = fitz.open(stream=uploaded_file.read(), filetype="pdf")
    page = doc.load_page(0)
    pix = page.get_pixmap()
    img = Image.frombytes("RGB", [pix.width, pix.height], pix.samples)
    img.thumbnail((100, 140))
    return img

# Function to merge PDFs
def merge_pdfs(reordered_files):
    """Merges multiple PDFs into one."""
    merger = PdfMerger()
    for file in reordered_files:
        file.seek(0)
        merger.append(file)
    output_filename = "combined_document.pdf"
    with open(output_filename, "wb") as output_file:
        merger.write(output_file)
    return output_filename

def download_file(output_file, file_name, mime_type):
    with open(output_file, "rb") as f:
        st.download_button(
            label="Download File",
            data=f,
            file_name=file_name,
            mime=mime_type,
        )

def generate_unique_filename(original_filename, suffix, file_type):
    """Generates a unique filename based on date, time, and original filename."""
    now = datetime.now()
    timestamp = now.strftime("%Y%m%d_%H%M%S")
    name, ext = os.path.splitext(original_filename)
    return f"{name}_{timestamp}{suffix}{file_type}"

def rotate_pdf(pdf_file, rotation_angle):
    """Rotates all pages of a PDF by a specified angle."""
    with tempfile.NamedTemporaryFile(suffix=".pdf", delete=False) as temp_pdf:
        temp_pdf.write(pdf_file.read())
        temp_pdf_path = temp_pdf.name

    doc = fitz.open(temp_pdf_path)
    for page in doc:
        page.set_rotation(rotation_angle)
    os.remove(temp_pdf_path)
    return doc

def display_pdf_preview(doc, page_num=0):
    """Displays a preview of a PDF page."""
    page = doc.load_page(page_num)
    pix = page.get_pixmap()
    img = Image.frombytes("RGB", [pix.width, pix.height], pix.samples)
    st.image(img, use_container_width=True)


# Sidebar Navigation
st.sidebar.title("Tool Selector")
selection = st.sidebar.radio("Choose a tool:", ["PDF Combiner", "PDF Transcriber", "PDF Rotator"])

# PDF Combiner with Preview and Reordering
if selection == "PDF Combiner":
    st.title("PDF Combiner with Preview & Reordering")
    st.write("Upload individual PDF pages, visualize them, reorder, and merge into a single PDF.")

    uploaded_files = st.file_uploader("Upload PDF pages", type="pdf", accept_multiple_files=True)

    if uploaded_files:
        # Generate thumbnails and filenames for each uploaded PDF
        thumbnails = []
        filenames = []

        for file in uploaded_files:
            thumbnails.append(get_pdf_thumbnail(file))
            filenames.append(file.name)

        # Display thumbnails with filenames for reordering
        st.write("**Drag and drop to reorder the PDFs:**")
        reordered_filenames = sort_items(filenames)

        # Map the filenames back to the corresponding files
        reordered_files = [uploaded_files[filenames.index(name)] for name in reordered_filenames]

        # Display the thumbnails in the new order
        st.write("**Preview of selected order:**")
        cols = st.columns(len(reordered_files))
        for idx, file in enumerate(reordered_files):
            with cols[idx]:
                st.image(get_pdf_thumbnail(file), caption=file.name, use_container_width=True)

        # Merge PDFs in the specified order
        if st.button("Merge PDFs"):
            output_file = merge_pdfs(reordered_files)
            st.success("PDF pages combined successfully!")
            download_file(output_file, generate_unique_filename("combined_document", "", ".pdf"), "application/pdf")
            os.remove(output_file)

# PDF Transcriber Tool
elif selection == "PDF Transcriber":
    st.title("PDF Transcriber Tool")
    st.write("Upload a scanned PDF to transcribe the text.")
    if not client:
        st.error("Google Cloud credentials are not set. Please configure the secret.")
    uploaded_file = st.file_uploader("Upload a PDF", type=["pdf"])
    if uploaded_file and st.button("Transcribe PDF"):
        with st.spinner("Processing..."):
            output_file = process_pdf(uploaded_file)
            if output_file:
                st.success("Text extraction complete!")
                st.text_area("Extracted Text", open(output_file, encoding="utf-8").read(), height=400)
                output_file_name = generate_unique_filename(uploaded_file.name, "(T)", ".txt")
                with open(output_file, "rb") as f:
                  st.download_button("Download Extracted Text", f, file_name=output_file_name, mime="text/plain")
                os.remove(output_file)
            else:
                st.error("Could not process the PDF, please try again")

# PDF Rotator Tool
elif selection == "PDF Rotator":
    st.title("PDF Rotator")
    st.write("Upload a PDF and rotate all pages by a specified angle.")

    pdf_file = st.file_uploader("Upload PDF", type=["pdf"])
    rotation_angle = st.selectbox("Select rotation angle:", [90, 180, 270])

    if pdf_file:
      if 'rotated_doc' not in st.session_state:
          st.session_state.rotated_doc = None
      if st.button("Rotate PDF"):
        with st.spinner("Rotating PDF..."):
          st.session_state.rotated_doc = rotate_pdf(pdf_file, rotation_angle)
          st.success("PDF rotated successfully!")
      if st.session_state.rotated_doc:
          display_pdf_preview(st.session_state.rotated_doc)
          if st.button("Download Rotated PDF"):
              with tempfile.NamedTemporaryFile(suffix=".pdf", delete=False) as temp_pdf:
                  st.session_state.rotated_doc.save(temp_pdf.name)
                  download_file(temp_pdf.name, generate_unique_filename(pdf_file.name, "(R)", ".pdf"), "application/pdf")
                  os.remove(temp_pdf.name)