app.py

import json
import os
import re
import time
import logging
import mimetypes
import concurrent.futures
import string
from typing import List, Dict, Optional, Union
from pathlib import Path
from urllib.parse import urlparse

import requests
import validators
import gradio as gr
import cachetools
from bs4 import BeautifulSoup
from fake_useragent import UserAgent
from ratelimit import limits, sleep_and_retry

# Setup logging with detailed configuration
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(levelname)s - [%(filename)s:%(lineno)d] - %(message)s',
    handlers=[
        logging.StreamHandler(),
        logging.FileHandler('app.log', encoding='utf-8')
    ]
)
logger = logging.getLogger(__name__)

class URLProcessor:
    """Class to handle URL processing with advanced features"""
    
    def __init__(self, timeout: int = 15, max_retries: int = 3, concurrent_requests: int = 5, cache_size: int = 100):
        self.timeout = timeout
        self.max_retries = max_retries
        self.concurrent_requests = concurrent_requests
        self.ua = UserAgent()  # Initialize UserAgent
        
        # Implement multilevel caching
        self.url_cache = cachetools.LRUCache(maxsize=cache_size)
        self.content_cache = cachetools.TTLCache(maxsize=cache_size, ttl=3600)  # 1-hour cache
        
        self.session = requests.Session()
        self.session.headers.update({
            'User -Agent': self.ua.random,  # Use random User-Agent
            'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
            'Accept-Language': 'en-US,en;q=0.5',
            'Connection': 'keep-alive'
        })

    @sleep_and_retry
    @limits(calls=10, period=60)  # Rate limiting: 10 calls per minute
    def validate_url(self, url: str) -> Dict[str, Union[bool, str]]:
        """Validate URL format and accessibility"""
        try:
            # Check cache first
            if url in self.url_cache:
                return self.url_cache[url]
            
            result = urlparse(url)
            validation_result = {
                'is_valid': False,
                'message': 'Invalid URL',
                'scheme': result.scheme,
                'netloc': result.netloc
            }
            
            if not all([result.scheme, result.netloc]):
                validation_result['message'] = 'Missing scheme or network location'
                return validation_result
            
            if not validators.url(url):
                validation_result['message'] = 'URL format validation failed'
                return validation_result
            
            # Perform HEAD request for accessibility
            try:
                response = self.session.head(url, timeout=self.timeout, allow_redirects=True)
                validation_result['is_valid'] = response.status_code in [200, 301, 302]
                validation_result['status_code'] = response.status_code
                validation_result['message'] = f"URL is {'valid' if validation_result['is_valid'] else 'invalid'}"
            except requests.RequestException as e:
                validation_result['message'] = f"Connection error: {str(e)}"
            
            # Cache the result
            self.url_cache[url] = validation_result
            return validation_result
        
        except Exception as e:
            logger.error(f"Unexpected error validating URL {url}: {e}")
            return {
                'is_valid': False, 
                'message': f"Unexpected validation error: {str(e)}"
            }

    @sleep_and_retry
    @limits(calls=20, period=60)  # Refined rate limiting
    def fetch_content(self, url: str) -> Optional[str]:
        """Fetch content from URL with retry mechanism"""
        # Check content cache first
        if url in self.content_cache:
            return self.content_cache[url]
        
        for attempt in range(self.max_retries):
            try:
                response = self.session.get(url, timeout=self.timeout)
                response.raise_for_status()
                
                # Use BeautifulSoup for more robust parsing
                soup = BeautifulSoup(response.text, 'html.parser')
                
                # Remove scripts, styles, comments
                for script in soup(["script", "style"]):
                    script.decompose()
                
                # Extract clean text
                text = soup.get_text(separator=' ')
                cleaned_text = self .advanced_text_cleaning(text)
                
                # Cache the result
                self.content_cache[url] = cleaned_text
                return cleaned_text
                
            except requests.RequestException as e:
                logger.warning(f"Fetch attempt {attempt + 1} failed for {url}: {e}")
                time.sleep(2 ** attempt)  # Exponential backoff
        
        return None

    def advanced_text_cleaning(self, text: str) -> str:
        """Sophisticated text cleaning and normalization"""
        if not text:
            return ""
        
        # Remove control characters
        text = re.sub(r'[\x00-\x1F\x7F-\x9F]', '', text)
        
        # Normalize Unicode characters
        text = text.encode('ascii', 'ignore').decode('ascii')
        
        # Replace multiple whitespaces
        text = re.sub(r'\s+', ' ', text)
        
        # Remove HTML entities
        text = re.sub(r'&[a-zA-Z]+;', '', text)
        
        # Normalize quotation marks
        text = text.replace('"', '"').replace('"', '"')
        text = text.replace('‘', "'").replace('’', "'")
        
        # Remove excessive punctuation
        text = re.sub(r'([.,!?]){2,}', r'\1', text)
        
        return text.strip()

class FileProcessor:
    """Class to handle file processing"""
    
    def __init__(self, max_file_size: int = 10 * 1024 * 1024):  # 10MB default
        self.max_file_size = max_file_size
        self.supported_text_extensions = {'.txt', '.md', '.csv', '.json', '.xml'}

    def is_text_file(self, filepath: str) -> bool:
        """Check if file is a text file"""
        try:
            mime_type, _ = mimetypes.guess_type(filepath)
            return mime_type and mime_type.startswith('text/')
        except Exception:
            return False

    def process_file(self, file) -> List[Dict]:
        """Process uploaded file with enhanced error handling"""
        if not file:
            return []

        dataset = []
        try:
            file_size = os.path.getsize(file.name)
            if file_size > self.max_file_size:
                logger.warning(f"File size ({file_size} bytes) exceeds maximum allowed size")
                return []

            with tempfile.TemporaryDirectory() as temp_dir:
                if zipfile.is_zipfile(file.name):
                    dataset.extend(self._process_zip_file(file.name, temp_dir))
                else:
                    dataset.extend(self._process_single_file(file))

        except Exception as e:
            logger.error(f"Error processing file: {str(e)}")
            return []

        return dataset

    def _process_zip_file(self, zip_path: str, temp_dir: str) -> List[Dict]:
        """Process ZIP file contents"""
        results = []
        with zipfile.ZipFile(zip_path, 'r') as zip_ref:
            zip_ref.extractall(temp_dir)
            for root, _, files in os.walk(temp_dir):
                for filename in files:
                    filepath = os.path.join(root, filename)
                    if self.is_text_file(filepath):
                        try:
                            with open(filepath, 'r', errors='ignore') as f:
                                content = f.read()
                            if content.strip():
                                results.append({
                                    "source": "file",
                                    "filename": filename,
                                    "content": content,
                                    "timestamp": time.strftime("%Y-%m-%d %H:%M:%S")
                                })
                        except Exception as e:
                            logger.error(f"Error reading file {filename}: {str(e)}")
        return results

    def _process_single_file(self, file) -> List[Dict]:
        """Process single file"""
        results = []
        try:
            content = file.read().decode('utf-8', errors='ignore')
            if content.strip():
                results.append({
                    "source": "file",
                    "filename": os.path.basename(file.name),
                    "content": content,
                    "timestamp": time.strftime("%Y-%m-%d %H:%M:%S")
                })
        except Exception as e:
            logger.error(f"Error processing single file: {str(e)}")
        return results

def create_interface():
    """Create a comprehensive Gradio interface with advanced features"""
    
    css = """
    .container { max-width: 1200px; margin: auto; }
    .warning { background-color: #fff3cd; color: #856404; }
    .error { background-color: #f8d7da; color: #721c24; }
    """
    
    with gr.Blocks(css=css, title="Advanced Text & URL Processor") as interface:
        gr.Markdown("# 🌐 Advanced URL & Text Processing Toolkit")
        
        with gr.Tab("URL Processing"):
            url_input = gr.Textbox(
                label="Enter URLs (comma or newline separated)", 
                lines=5,
                placeholder="https://example1.com\nhttps://example2.com"
            )
        
        with gr.Tab("File Input"):
            file_input = gr.File(
                label="Upload text file or ZIP archive",
                file_types=[".txt", ".zip", ".md", ".csv", ".json", ".xml"]
            )

        with gr.Tab("Text Input"):
            text_input = gr.Textbox(
                label="Raw Text Input", 
                lines=5,
                placeholder="Paste your text here..."
            )
        
        process_btn = gr.Button("Process Input", variant="primary")
        
        output_text = gr.Textbox(label="Processing Results", interactive=False)
        output_file = gr.File(label="Processed Output")
        
        def process_all_inputs(urls, file, text):
            """Process all input types with progress tracking"""
            try:
                processor = URLProcessor()
                file_processor = FileProcessor()
                results = []
                
                # Process URLs
                if urls:
                    url_list = re.split(r'[,\n]', urls)
                    url_list = [url.strip() for url in url_list if url.strip()]
                    
                    for url in url_list:
                        validation = processor.validate_url(url)
                        if validation.get('is_valid'):
                            content = processor.fetch_content(url)
                            if content:
                                results.append({
                                    'source': 'url',
                                    'url': url,
                                    'content': content,
                                    'timestamp': time.strftime("%Y-%m-%d %H:%M:%S")
                                })
                
                # Process files
                if file:
                    results.extend(file_processor.process_file(file))

                # Process text input
                if text:
                    cleaned_text = processor.advanced_text_cleaning(text)
                    results.append({
                        'source': 'direct_input',
                        'content': cleaned_text,
                        'timestamp': time.strftime("%Y-%m-%d %H:%M:%S")
                    })
                
                # Generate output
                if results:
                    output_path = 'processed_data.json'
                    with open(output_path, 'w', encoding='utf-8') as f:
                        json.dump(results, f, ensure_ascii=False, indent=2)
                    
                    summary = f"Processed {len(results)} items successfully!"
                    return output_path, summary
                else:
                    return None, "No valid content to process."
            
            except Exception as e:
                logger.error(f"Processing error: {e}")
                return None, f"Error: {str(e)}"
        
        process_btn.click(
            process_all_inputs, 
            inputs=[url_input, file_input, text_input], 
            outputs=[output_file, output_text]
        )
        
        gr.Markdown("""
        ### Usage Guidelines
        - **URL Processing**: Enter valid HTTP/HTTPS URLs
        - **File Input**: Upload text files or ZIP archives
        - **Text Input**: Direct text processing
        - Advanced cleaning and validation included
        """)
    
    return interface

def main():
    # Configure system settings
    mimetypes.init()
    
    # Create and launch interface
    interface = create_interface()
    interface.launch(
        share=True,
        server_name="0.0.0.0",
        server_port=7860,
        debug=True
    )

if __name__ == "__main__":
    main()