app.py

import streamlit as st
st.set_page_config(page_title="Advanced File Downloader", layout="wide")

# Core imports
import os
import subprocess
from playwright.async_api import async_playwright, TimeoutError as PlaywrightTimeoutError
import asyncio
import logging
from urllib.parse import urlparse
import re
from pathlib import Path
from io import BytesIO
import random
from bs4 import BeautifulSoup
from PyPDF2 import PdfReader
import zipfile
import tempfile
import mimetypes
import requests
import datetime
import spacy
import spacy.cli
from spacy.language import Language
import google_auth_oauthlib.flow
import googleapiclient.discovery
import google.auth.transport.requests
from async_timeout import timeout as async_timeout
# -------------------- Logging Setup --------------------
logging.basicConfig(
    filename='advanced_download_log.txt',
    level=logging.INFO,
    format='%(asctime)s - %(levelname)s - %(message)s'
)
logger = logging.getLogger(__name__)
# Google OAuth Configuration
GOOGLE_OAUTH_CONFIG = {
    "web": {
        "client_id": "90798824947-u25obg1q844qeikjoh4jdmi579kn9p1c.apps.googleusercontent.com",
        "project_id": "huggingface-449214",
        "auth_uri": "https://accounts.google.com/o/oauth2/auth",
        "token_uri": "https://oauth2.googleapis.com/token",
        "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
        "client_secret": "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",
        "redirect_uris": ["https://euler314-craw-web.hf.space/"]
    }
}

# Playwright Setup
def install_playwright_dependencies():
    os.environ['PLAYWRIGHT_BROWSERS_PATH'] = os.path.expanduser("~/.cache/ms-playwright")
    os.environ['LD_LIBRARY_PATH'] = '/usr/lib/playwright:/usr/lib/x86_64-linux-gnu'
    try:
        subprocess.run(['apt-get', 'update', '-y'], check=True)
        packages = [
            'libnss3', 'libnss3-tools', 'libnspr4', 'libatk1.0-0',
            'libatk-bridge2.0-0', 'libatspi2.0-0', 'libcups2', 'libxcomposite1',
            'libxdamage1', 'libdrm2', 'libgbm1', 'libpango-1.0-0'
        ]
        subprocess.run(['apt-get', 'install', '-y', '--no-install-recommends'] + packages, check=True)
        os.makedirs('/usr/lib/playwright', exist_ok=True)
        symlinks = {
            'libnss3.so': '/usr/lib/x86_64-linux-gnu/libnss3.so',
            'libnssutil3.so': '/usr/lib/x86_64-linux-gnu/libnssutil3.so',
            'libsmime3.so': '/usr/lib/x86_64-linux-gnu/libsmime3.so',
            'libnspr4.so': '/usr/lib/x86_64-linux-gnu/libnspr4.so',
            'libatk-1.0.so.0': '/usr/lib/x86_64-linux-gnu/libatk-1.0.so.0',
            'libatk-bridge-2.0.so.0': '/usr/lib/x86_64-linux-gnu/libatk-bridge-2.0.so.0',
            'libcups.so.2': '/usr/lib/x86_64-linux-gnu/libcups.so.2',
            'libatspi.so.0': '/usr/lib/x86_64-linux-gnu/libatspi.so.0',
            'libXcomposite.so.1': '/usr/lib/x86_64-linux-gnu/libXcomposite.so.1',
            'libXdamage.so.1': '/usr/lib/x86_64-linux-gnu/libXdamage.so.1'
        }
        for link_name, target in symlinks.items():
            link_path = os.path.join('/usr/lib/playwright', link_name)
            if not os.path.exists(link_path):
                os.symlink(target, link_path)
        subprocess.run(['python3', '-m', 'playwright', 'install', 'chromium'], check=True)
        browser_path = os.path.expanduser("~/.cache/ms-playwright")
        os.makedirs(browser_path, exist_ok=True)
        subprocess.run(['chmod', '-R', '755', browser_path], check=True)
    except subprocess.CalledProcessError as e:
        print(f"Error installing dependencies: {e}")
    except Exception as e:
        print(f"Error: {e}")

# Initialize Playwright
install_playwright_dependencies()

# Model Loading
@st.cache_resource
def load_models():
    try:
        # Try to load spaCy model
        try:
            nlp = spacy.load("en_core_web_sm")
        except OSError:
            st.info("Downloading spaCy model...")
            spacy.cli.download("en_core_web_sm")
            nlp = spacy.load("en_core_web_sm")

        # Load SentenceTransformer with offline handling
        try:
            from sentence_transformers import SentenceTransformer
            model_name = 'all-MiniLM-L6-v2'
            cache_dir = os.path.expanduser('~/.cache/torch/sentence_transformers')
            if os.path.exists(os.path.join(cache_dir, model_name)):
                semantic_model = SentenceTransformer(os.path.join(cache_dir, model_name))
            else:
                st.warning(f"Downloading SentenceTransformer model {model_name}...")
                semantic_model = SentenceTransformer(model_name)
        except Exception as e:
            st.error(f"Error loading SentenceTransformer: {e}")
            semantic_model = None

        # Load Transformers pipeline with offline handling
        try:
            from transformers import pipeline
            model_name = "facebook/bart-large-cnn"
            cache_dir = os.path.expanduser('~/.cache/huggingface/transformers')
            if os.path.exists(os.path.join(cache_dir, model_name)):
                summarizer = pipeline("summarization", model=model_name)
            else:
                st.warning(f"Downloading Transformer model {model_name}...")
                summarizer = pipeline("summarization")
        except Exception as e:
            st.error(f"Error loading Transformers: {e}")
            summarizer = None

        return nlp, semantic_model, summarizer

    except Exception as e:
        st.error(f"Error loading models: {e}")
        return None, None, None

# Initialize models
with st.spinner("Loading models..."):
    nlp_model, semantic_model, summarizer = load_models()

# Utility Functions
def get_random_user_agent():
    USER_AGENTS = [
        'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36',
        'Mozilla/5.0 (Macintosh; Intel Mac OS X 12_6_3) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.4 Safari/605.1.15',
        'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36',
        'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:115.0) Gecko/20100101 Firefox/115.0',
    ]
    return random.choice(USER_AGENTS)

def sizeof_fmt(num, suffix='B'):
    for unit in ['', 'K', 'M', 'G', 'T', 'P', 'E', 'Z']:
        if abs(num) < 1024.0:
            return f"{num:3.1f}{unit}{suffix}"
        num /= 1024.0
    return f"{num:.1f}Y{suffix}"

def create_zip_file(file_paths, output_dir):
    timestamp = datetime.datetime.now().strftime("%Y%m%d_%H%M%S")
    zip_path = os.path.join(output_dir, f"downloads_{timestamp}.zip")
    
    with zipfile.ZipFile(zip_path, 'w') as zipf:
        for file_path in file_paths:
            zipf.write(file_path, os.path.basename(file_path))
    
    return zip_path

# Google Drive Functions
def get_google_auth_url():
    client_config = GOOGLE_OAUTH_CONFIG["web"]
    flow = google_auth_oauthlib.flow.Flow.from_client_config(
        {"web": client_config},
        scopes=["https://www.googleapis.com/auth/drive.file"]
    )
    flow.redirect_uri = client_config["redirect_uris"][0]
    authorization_url, _ = flow.authorization_url(
        access_type="offline",
        include_granted_scopes="true",
        prompt="consent"
    )
    return authorization_url

def exchange_code_for_credentials(auth_code):
    if not auth_code.strip():
        return None, "No code provided."
    try:
        client_config = GOOGLE_OAUTH_CONFIG["web"]
        flow = google_auth_oauthlib.flow.Flow.from_client_config(
            {"web": client_config},
            scopes=["https://www.googleapis.com/auth/drive.file"]
        )
        flow.redirect_uri = client_config["redirect_uris"][0]
        flow.fetch_token(code=auth_code.strip())
        creds = flow.credentials
        if not creds or not creds.valid:
            return None, "Could not validate credentials. Check code and try again."
        return creds, "Google Sign-In successful!"
    except Exception as e:
        return None, f"Error during token exchange: {e}"

def google_drive_upload(zip_path: str, credentials):
    try:
        drive_service = googleapiclient.discovery.build("drive", "v3", credentials=credentials)
        file_metadata = {'name': os.path.basename(zip_path)}
        media = googleapiclient.http.MediaFileUpload(zip_path, resumable=True)
        created = drive_service.files().create(body=file_metadata, media_body=media, fields='id').execute()
        return created.get("id", "")
    except Exception as e:
        return f"Error uploading to Drive: {str(e)}"
# DownloadManager Class
class DownloadManager:
    def __init__(self, use_proxy=False, proxy=None, query=None, num_results=5):
        self.use_proxy = use_proxy
        self.proxy = proxy
        self.query = query
        self.num_results = num_results
        self.playwright = None
        self.browser = None
        self.context = None
        self.page = None

    async def __aenter__(self):
        self.playwright = await async_playwright().start()
        opts = {
            "headless": True,
            "args": [
                '--no-sandbox',
                '--disable-setuid-sandbox',
                '--disable-dev-shm-usage',
                '--disable-gpu',
                '--no-zygote',
                '--single-process'
            ]
        }
        if self.use_proxy and self.proxy:
            opts["proxy"] = {"server": self.proxy}
        
        self.browser = await self.playwright.chromium.launch(**opts)
        self.context = await self.browser.new_context(user_agent=get_random_user_agent())
        self.page = await self.context.new_page()
        await self.page.set_extra_http_headers({
            'Accept-Language': 'en-US,en;q=0.9',
            'Accept-Encoding': 'gzip, deflate, br',
            'Referer': 'https://www.bing.com/'
        })
        return self

    async def __aexit__(self, exc_type, exc_val, exc_tb):
        if self.browser:
            await self.browser.close()
        if self.playwright:
            await self.playwright.stop()

    async def get_file_size(self, url):
        try:
            async with self.context.new_page() as page:
                response = await page.request.head(url, timeout=15000)
                length = response.headers.get('Content-Length', None)
                if length:
                    return sizeof_fmt(int(length))
                else:
                    return "Unknown Size"
        except Exception:
            return "Unknown Size"

    async def get_pdf_metadata(self, url):
        try:
            async with self.context.new_page() as page:
                resp = await page.request.get(url, timeout=15000)
                if resp.ok:
                    content = await resp.body()
                    pdf = BytesIO(content)
                    reader = PdfReader(pdf)
                    return {
                        'Title': reader.metadata.get('/Title', 'N/A') if reader.metadata else 'N/A',
                        'Author': reader.metadata.get('/Author', 'N/A') if reader.metadata else 'N/A',
                        'Pages': len(reader.pages),
                    }
                else:
                    return {}
        except Exception:
            return {}

    async def extract_real_download_url(self, url):
        try:
            async with self.context.new_page() as page:
                response = await page.goto(url, wait_until='networkidle', timeout=30000)
                if response and response.headers.get('location'):
                    return response.headers['location']
                return page.url
        except Exception as e:
            logger.error(f"Error extracting real download URL: {e}")
            return url

    async def extract_downloadable_files(self, url, custom_ext_list):
        found_files = []
        try:
            response = await self.page.goto(url, timeout=30000, wait_until='networkidle')
            if not response:
                return []

            final_url = self.page.url
            if '.php' in final_url or 'download' in final_url:
                real_url = await self.extract_real_download_url(final_url)
                if real_url != final_url:
                    found_files.append({
                        'url': real_url,
                        'filename': os.path.basename(urlparse(real_url).path) or 'downloaded_file',
                        'size': await self.get_file_size(real_url),
                        'metadata': {}
                    })
                    return found_files

            await self.page.wait_for_load_state('networkidle', timeout=30000)
            content = await self.page.content()
            soup = BeautifulSoup(content, 'html.parser')
            
            default_exts = ['.pdf', '.docx', '.doc', '.zip', '.rar', '.mp3', '.mp4', 
                          '.avi', '.mkv', '.png', '.jpg', '.jpeg', '.gif']
            all_exts = set(default_exts + [ext.strip().lower() for ext in custom_ext_list if ext.strip()])
            
            parsed_base = urlparse(final_url)
            base_url = f"{parsed_base.scheme}://{parsed_base.netloc}"
            
            for a in soup.find_all('a', href=True):
                href = a['href'].strip()
                
                # Handle PHP scripts and redirects
                if '.php' in href.lower() or 'download' in href.lower():
                    full_url = href if href.startswith('http') else (
                        f"{base_url}{href}" if href.startswith('/') else f"{base_url}/{href}"
                    )
                    real_url = await self.extract_real_download_url(full_url)
                    if real_url and real_url != full_url:
                        found_files.append({
                            'url': real_url,
                            'filename': os.path.basename(urlparse(real_url).path) or 'downloaded_file',
                            'size': await self.get_file_size(real_url),
                            'metadata': {}
                        })
                        continue

                # Handle direct file links
                if any(href.lower().endswith(ext) for ext in all_exts):
                    file_url = href if href.startswith('http') else (
                        f"{base_url}{href}" if href.startswith('/') else f"{base_url}/{href}"
                    )
                    
                    size_str = await self.get_file_size(file_url)
                    meta = {}
                    if file_url.lower().endswith('.pdf'):
                        meta = await self.get_pdf_metadata(file_url)

                    found_files.append({
                        'url': file_url,
                        'filename': os.path.basename(file_url.split('?')[0]),
                        'size': size_str,
                        'metadata': meta
                    })

                # Handle Google Drive links
                elif ("drive.google.com" in href) or ("docs.google.com" in href):
                    file_id = None
                    for pattern in [r'/file/d/([^/]+)', r'id=([^&]+)', r'open\?id=([^&]+)']:
                        match = re.search(pattern, href)
                        if match:
                            file_id = match.group(1)
                            break
                    
                    if file_id:
                        direct_url = f"https://drive.google.com/uc?export=download&id={file_id}"
                        filename = file_id
                        try:
                            response = await self.page.request.head(direct_url, timeout=15000)
                            cd = response.headers.get("Content-Disposition", "")
                            if cd:
                                mt = re.search(r'filename\*?="?([^";]+)', cd)
                                if mt:
                                    filename = mt.group(1).strip('"').strip()
                            
                            found_files.append({
                                'url': direct_url,
                                'filename': filename,
                                'size': await self.get_file_size(direct_url),
                                'metadata': {}
                            })
                        except Exception as e:
                            logger.error(f"Error processing Google Drive link: {e}")
            
            # Make results unique based on URLs
            seen_urls = set()
            unique_files = []
            for f in found_files:
                if f['url'] not in seen_urls:
                    seen_urls.add(f['url'])
                    unique_files.append(f)
            
            return unique_files
        except Exception as e:
            logger.error(f"Error extracting files from {url}: {e}")
            return []

    async def download_file(self, file_info, save_dir, referer):
        file_url = file_info['url']
        fname = file_info['filename']
        path = os.path.join(save_dir, fname)
        base, ext = os.path.splitext(fname)
        counter = 1
        while os.path.exists(path):
            path = os.path.join(save_dir, f"{base}_{counter}{ext}")
            counter += 1
        
        os.makedirs(save_dir, exist_ok=True)
        
        try:
            if "drive.google.com" in file_url:
                import gdown
                try:
                    st.write(f"Downloading from Google Drive: {fname}")
                    output = gdown.download(file_url, path, quiet=False)
                    if output:
                        return path
                    return None
                except Exception as e:
                    logger.error(f"Google Drive download error: {e}")
                    return None
            
            async with self.context.new_page() as page:
                st.write(f"Downloading: {fname}")
                
                headers = {
                    'Accept': '*/*',
                    'Accept-Encoding': 'gzip, deflate, br',
                    'Referer': referer
                }
                
                response = await page.request.get(file_url, headers=headers, timeout=30000)
                
                if response.status == 200:
                    content = await response.body()
                    with open(path, 'wb') as f:
                        f.write(content)
                    return path
                else:
                    logger.error(f"Download failed with status {response.status}: {file_url}")
                    return None
                    
        except Exception as e:
            logger.error(f"Error downloading {file_url}: {e}")
            return None

    async def deep_search(self, url, custom_ext_list=None, sublink_limit=10000, timeout=60):
        if not custom_ext_list:
            custom_ext_list = []
            
        progress_text = st.empty()
        progress_bar = st.progress(0)
        file_count_text = st.empty()
        
        try:
            # Search main page
            progress_text.text("Analyzing main page...")
            main_files = await self.extract_downloadable_files(url, custom_ext_list)
            initial_count = len(main_files)
            file_count_text.text(f"Found {initial_count} files on main page")
            
            # Get and search sublinks
            progress_text.text("Getting sublinks...")
            sublinks = await self.get_sublinks(url, sublink_limit)
            total_links = len(sublinks)
            
            progress_text.text(f"Found {total_links} sublinks to process")
            
            if not sublinks:
                progress_bar.progress(1.0)
                return main_files
                
            # Process sublinks
            all_files = main_files
            
            for i, sublink in enumerate(sublinks, 1):
                progress = i/total_links
                progress_text.text(f"Processing sublink {i}/{total_links}: {sublink}")
                progress_bar.progress(progress)
                
                sub_files = await self.extract_downloadable_files(sublink, custom_ext_list)
                all_files.extend(sub_files)
                
                # Update count in real-time
                file_count_text.text(f"Found {len(all_files)} total files")
                
            # Make results unique
            seen_urls = set()
            unique_files = []
            
            for f in all_files:
                if f['url'] not in seen_urls:
                    seen_urls.add(f['url'])
                    unique_files.append(f)
                    
            final_count = len(unique_files)
            progress_text.text(f"Deep search complete!")
            file_count_text.text(f"Found {final_count} unique files")
            progress_bar.progress(1.0)
            
            return unique_files
            
        except Exception as e:
            logger.error(f"Deep search error: {e}")
            progress_text.text(f"Error during deep search: {str(e)}")
            return []
        finally:
            # Clean up progress indicators after a delay
            await asyncio.sleep(2)
            if not st.session_state.get('keep_progress', False):
                progress_text.empty()
                progress_bar.empty()

    async def get_sublinks(self, url, limit=10000):
        try:
            await self.page.goto(url, timeout=30000)
            content = await self.page.content()
            soup = BeautifulSoup(content, 'html.parser')
            
            parsed_base = urlparse(url)
            base_url = f"{parsed_base.scheme}://{parsed_base.netloc}"
            
            links = set()
            for a in soup.find_all('a', href=True):
                href = a['href'].strip()
                if href.startswith('http'):
                    links.add(href)
                elif href.startswith('/'):
                    links.add(f"{base_url}{href}")
                    
            return list(links)[:limit]
            
        except Exception as e:
            logger.error(f"Error getting sublinks: {e}")
            return []

def safe_rerun():
    """Safely rerun the app if experimental_rerun is available."""
    if hasattr(st, "experimental_rerun"):
        st.experimental_rerun()

def main():
    # Initialize session state on first run
    if 'initialized' not in st.session_state:
        st.session_state.initialized = True
        st.session_state.discovered_files = []
        st.session_state.current_url = None
        st.session_state.google_creds = None
        st.session_state.selected_files = []

    st.title("Advanced File Downloader")
    
    # Sidebar configuration
    with st.sidebar:
        mode = st.radio("Select Mode", ["Manual URL", "Bing Search", "PDF Summarizer"], key="mode_select")
        with st.expander("Advanced Options", expanded=True):
            custom_extensions = st.text_input("Custom File Extensions", placeholder=".csv, .txt, .epub", key="custom_ext_input")
            max_sublinks = st.number_input(
                "Maximum Sublinks to Process",
                min_value=1,
                max_value=100000,
                value=10000,
                step=50,
                help="Maximum number of sublinks to process from the main page",
                key="max_sublinks_input"
            )
            sublink_timeout = st.number_input(
                "Search Timeout (seconds per sublink)",
                min_value=1,
                max_value=3000,
                value=30,
                step=5,
                help="Maximum time to spend searching each sublink",
                key="timeout_input"
            )
            use_proxy = st.checkbox("Use Proxy", key="proxy_checkbox")
            proxy = st.text_input("Proxy URL", placeholder="http://proxy:port", key="proxy_input")
        with st.expander("Google Drive Integration", expanded=False):
            if st.button("Start Google Sign-In", key="google_signin_btn"):
                auth_url = get_google_auth_url()
                st.markdown(f"[Click here to authorize]({auth_url})")
            auth_code = st.text_input("Enter authorization code", key="auth_code_input")
            if st.button("Complete Sign-In", key="complete_signin_btn") and auth_code:
                creds, msg = exchange_code_for_credentials(auth_code)
                st.session_state.google_creds = creds
                st.write(msg)
    
    # Main content area
    if mode == "Manual URL":
        st.header("Manual URL Mode")
        url = st.text_input("Enter URL", placeholder="https://example.com", key="url_input")
        
        col1, col2 = st.columns([3, 1])
        with col1:
            if st.button("Deep Search", use_container_width=True, key="deep_search_btn"):
                if url:
                    async def run_deep_search():
                        try:
                            async with DownloadManager(use_proxy=use_proxy, proxy=proxy) as dm:
                                files = await dm.deep_search(
                                    url=url,
                                    custom_ext_list=custom_extensions.split(',') if custom_extensions else [],
                                    sublink_limit=int(max_sublinks),
                                    timeout=int(sublink_timeout)
                                )
                                if files:
                                    st.session_state.discovered_files = files
                                    st.session_state.current_url = url
                                return files
                        except Exception as e:
                            st.error(f"Error during deep search: {str(e)}")
                            return None
                    
                    files = asyncio.run(run_deep_search())
                    if files:
                        st.success(f"Found {len(files)} files!")
                        
                        # File selection block 1
                        col1, col2 = st.columns([1, 4])
                        with col1:
                            if st.button("Select All", key="select_all_btn"):
                                st.session_state.selected_files = list(range(len(files)))
                                safe_rerun()
                            if st.button("Clear Selection", key="clear_selection_btn"):
                                st.session_state.selected_files = []
                                safe_rerun()
                        
                        selected_files = st.multiselect(
                            "Select files to download",
                            options=list(range(len(files))),
                            default=st.session_state.selected_files,
                            format_func=lambda x: f"{files[x]['filename']} ({files[x]['size']})",
                            key="file_multiselect"
                        )
                        st.session_state.selected_files = selected_files
                        
                        if selected_files:
                            col1, col2, col3, col4 = st.columns(4)
                            with col1:
                                download_dir = st.text_input("Download Directory", value="./downloads", key="download_dir_input")
                            with col2:
                                create_zip = st.checkbox("Create ZIP file", value=True, key="create_zip_checkbox")
                            with col3:
                                delete_after = st.checkbox("Delete after creating ZIP", key="delete_after_checkbox")
                            with col4:
                                upload_to_drive = st.checkbox("Upload to Google Drive", key="upload_drive_checkbox")
                            
                            if st.button("Download Selected", key="download_btn"):
                                if not os.path.exists(download_dir):
                                    os.makedirs(download_dir)
                                
                                async def download_files():
                                    downloaded_paths = []
                                    progress_bar = st.progress(0)
                                    status_text = st.empty()
                                    async with DownloadManager(use_proxy=use_proxy, proxy=proxy) as dm:
                                        for i, idx in enumerate(selected_files):
                                            progress = (i + 1) / len(selected_files)
                                            file_info = files[idx]
                                            status_text.text(f"Downloading {file_info['filename']}... ({i+1}/{len(selected_files)})")
                                            progress_bar.progress(progress)
                                            path = await dm.download_file(file_info, download_dir, url)
                                            if path:
                                                downloaded_paths.append(path)
                                        status_text.empty()
                                        progress_bar.empty()
                                        return downloaded_paths
                                
                                downloaded = asyncio.run(download_files())
                                
                                if downloaded:
                                    st.success(f"Successfully downloaded {len(downloaded)} files")
                                    if create_zip or upload_to_drive:
                                        zip_path = create_zip_file(downloaded, download_dir)
                                        st.success(f"Created ZIP file: {zip_path}")
                                        if upload_to_drive and st.session_state.get('google_creds'):
                                            with st.spinner("Uploading to Google Drive..."):
                                                drive_id = google_drive_upload(zip_path, st.session_state.google_creds)
                                                if not isinstance(drive_id, str) or not drive_id.startswith("Error"):
                                                    st.success(f"Uploaded to Google Drive. File ID: {drive_id}")
                                                else:
                                                    st.error(drive_id)
                                        if delete_after:
                                            for path in downloaded:
                                                try:
                                                    os.remove(path)
                                                except Exception as e:
                                                    st.warning(f"Could not delete {path}: {e}")
                                            st.info("Deleted original files after ZIP creation")
                    else:
                        st.warning("No files found.")
        
        # File selection block 2 (if files are already discovered)
        if st.session_state.discovered_files:
            files = st.session_state.discovered_files
            st.success(f"Found {len(files)} files!")
            col1, col2 = st.columns([1, 4])
            with col1:
                if st.button("Select All", key="select_all_btn2"):
                    st.session_state.selected_files = list(range(len(files)))
                    safe_rerun()
                if st.button("Clear Selection", key="clear_selection_btn2"):
                    st.session_state.selected_files = []
                    safe_rerun()
            selected_files = st.multiselect(
                "Select files to download",
                options=list(range(len(files))),
                default=st.session_state.selected_files,
                format_func=lambda x: f"{files[x]['filename']} ({files[x]['size']})",
                key="file_multiselect2"
            )
            st.session_state.selected_files = selected_files
            if selected_files:
                col1, col2, col3, col4 = st.columns(4)
                with col1:
                    download_dir = st.text_input("Download Directory", value="./downloads", key="download_dir_input2")
                with col2:
                    create_zip = st.checkbox("Create ZIP file", value=True, key="create_zip_checkbox2")
                with col3:
                    delete_after = st.checkbox("Delete after creating ZIP", key="delete_after_checkbox2")
                with col4:
                    upload_to_drive = st.checkbox("Upload to Google Drive", key="upload_drive_checkbox2")
                if st.button("Download Selected", key="download_btn2"):
                    if not os.path.exists(download_dir):
                        os.makedirs(download_dir)
                    
                    async def download_files():
                        downloaded_paths = []
                        progress_bar = st.progress(0)
                        status_text = st.empty()
                        async with DownloadManager(use_proxy=use_proxy, proxy=proxy) as dm:
                            for i, idx in enumerate(selected_files):
                                progress = (i + 1) / len(selected_files)
                                file_info = files[idx]
                                status_text.text(f"Downloading {file_info['filename']}... ({i+1}/{len(selected_files)})")
                                progress_bar.progress(progress)
                                path = await dm.download_file(file_info, download_dir, st.session_state.current_url)
                                if path:
                                    downloaded_paths.append(path)
                            status_text.empty()
                            progress_bar.empty()
                            return downloaded_paths
                    downloaded = asyncio.run(download_files())
                    if downloaded:
                        st.success(f"Successfully downloaded {len(downloaded)} files")
                        if create_zip or upload_to_drive:
                            zip_path = create_zip_file(downloaded, download_dir)
                            st.success(f"Created ZIP file: {zip_path}")
                            if upload_to_drive and st.session_state.get('google_creds'):
                                with st.spinner("Uploading to Google Drive..."):
                                    drive_id = google_drive_upload(zip_path, st.session_state.google_creds)
                                    if not isinstance(drive_id, str) or not drive_id.startswith("Error"):
                                        st.success(f"Uploaded to Google Drive. File ID: {drive_id}")
                                    else:
                                        st.error(drive_id)
                            if delete_after:
                                for path in downloaded:
                                    try:
                                        os.remove(path)
                                    except Exception as e:
                                        st.warning(f"Could not delete {path}: {e}")
                                st.info("Deleted original files after ZIP creation")
    
    elif mode == "Bing Search":
        st.header("Bing Search Mode")
        query = st.text_input("Enter search query", key="search_query_input")
        num_results = st.slider("Number of results", 1, 50, 5, key="num_results_slider")
        if st.button("Search", key="search_btn"):
            if query:
                async def run_search():
                    async with DownloadManager(
                        use_proxy=use_proxy,
                        proxy=proxy,
                        query=query,
                        num_results=num_results
                    ) as dm:
                        with st.spinner("Searching..."):
                            urls = await dm.search_bing()
                            if urls:
                                st.success(f"Found {len(urls)} results!")
                                for i, url in enumerate(urls, 1):
                                    with st.expander(f"Result {i}: {url}", expanded=i==1):
                                        if st.button(f"Deep Search Result {i}", key=f"deep_search_result_{i}"):
                                            files = await dm.deep_search(
                                                url=url,
                                                custom_ext_list=custom_extensions.split(',') if custom_extensions else [],
                                                sublink_limit=max_sublinks,
                                                timeout=sublink_timeout
                                            )
                                            if files:
                                                st.session_state.discovered_files = files
                                                st.session_state.current_url = url
                                                st.session_state.selected_files = []
                                                safe_rerun()
                                            else:
                                                st.warning("No files found on this page.")
                            else:
                                st.warning("No search results found.")
                asyncio.run(run_search())
    
    else:  # PDF Summarizer mode
        if summarizer is None:
            st.error("PDF summarization is not available due to model loading errors.")
        else:
            st.header("PDF Summarizer")
            pdf_url = st.text_input("Enter PDF URL", key="pdf_url_input")
            if st.button("Summarize", key="summarize_btn"):
                if pdf_url:
                    with st.spinner("Generating summary..."):
                        try:
                            response = requests.get(pdf_url, stream=True)
                            temp_pdf = tempfile.NamedTemporaryFile(delete=False, suffix=".pdf")
                            with open(temp_pdf.name, "wb") as f:
                                f.write(response.content)
                            reader = PdfReader(temp_pdf.name)
                            text = " ".join([page.extract_text() or "" for page in reader.pages])
                            os.remove(temp_pdf.name)
                            limited_text = text[:3000]
                            summary = summarizer(limited_text, max_length=200, min_length=50, do_sample=False)
                            st.write("Summary:")
                            st.write(summary[0]['summary_text'])
                        except Exception as e:
                            st.error(f"Error summarizing PDF: {e}")

if __name__ == "__main__":
    try:
        main()
    except Exception as e:
        st.error(f"An error occurred: {str(e)}")