import logging
import copy
import re
import os
import json
import html

from datetime import datetime
from typing import Union, Dict, Any, List
from pyrogram.types import Message
from pyrogram.enums import MessageMediaType
from bleach.css_sanitizer import CSSSanitizer   
from bleach import clean as HTMLSanitizer
from config import get_settings
from url_signer import generate_media_digest

Config = get_settings()

logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)

if not logger.handlers:
    handler = logging.StreamHandler()
    handler.setFormatter(logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s'))
    logger.addHandler(handler)


#tests
#http://127.0.0.1:8000/post/html/DragorWW_space/114 — video
#http://127.0.0.1:8000/post/html/DragorWW_space/20 - many photos
#http://127.0.0.1:8000/post/html/DragorWW_space/58 - photos+video
#http://127.0.0.1:8000/post/html/DragorWW_space/44 - poll
#http://127.0.0.1:8000/post/html/DragorWW_space/46 - photo
#http://127.0.0.1:8000/post/html/DragorWW_space/49, http://127.0.0.1:8000/post/html/DragorWW_space/63  — webpage
#http://127.0.0.1:8000/post/html/deckru/826 - animation
#http://127.0.0.1:8000/post/html/DragorWW_space/61 — links
#http://127.0.0.1:8000/post/html/theyforcedme/3577 - video note
#http://127.0.0.1:8000/post/html/theyforcedme/3572 - audio
#http://127.0.0.1:8000/post/html/theyforcedme/3558 - audio-note
#http://127.0.0.1:8000/html/vvzvlad_lytdybr/426 - sticker
#http://127.0.0.1:8000/html/wrkshprn/634
# http://127.0.0.1:8000/html/ni404head/1278
# http://127.0.0.1:8000/html/fieryfiles/4840 — links without <a>
#http://127.0.0.1:8000/html/ru2ch_ban/26586 - large video
#http://127.0.0.1:8000/html/smallpharm/4828 - forwarded from channel
#http://127.0.0.1:8000/html/vvzvlad_lytdybr/659 - forwarded from user
#http://127.0.0.1:8000/html/ufjqk/1070 - reply to
#http://127.0.0.1:8000/html/tetstststststststffd/4 - forwarded from channel without name
#http://127.0.0.1:8000/html/tetstststststststffd/14 - forwarded from hidden user
#https://t.me/smallpharm/4802 many pics and text
# https://t.me/webstrangler/3987 many pics without text
# https://t.me/teslacoilpro/7117
# https://t.me/red_spades/1222 many media + text

#https://t.me/ni404head/1283 file
#http://127.0.0.1:8000/rss/-1002069358234 channel with numeric ID

class PostParser:
    def __init__(self, client):
        self.client = client

    def _debug_message(self, message: Message) -> Message:
        debug_message = copy.deepcopy(message)
        #debug_message.sender_chat = None
        #debug_message.caption_entities = None
        #debug_message.reactions = None
        #debug_message.entities = None
        print(debug_message)
        return
    
    def channel_name_prepare(self, channel: str):
        if isinstance(channel, str) and channel.startswith('-100'): # Convert numeric channel ID to int
            channel_id = int(channel)
            return channel_id
        else:
            return channel

    async def get_post(self, channel: str, post_id: int, output_type: str = 'json', debug: bool = False) -> Union[str, Dict[Any, Any]]:
        print(f"Getting post {channel}, {post_id}")
        try:
            channel = self.channel_name_prepare(channel)
            message = await self.client.get_messages(channel, post_id)

            # Print debug message if global debug is enabled or debug url parameter is True
            if Config["debug"] or debug:
                self._debug_message(message)

            if not message:
                logger.error(f"post_not_found: channel {channel}, post_id {post_id}")
                return None
            
            if output_type == 'html':
                return self._format_html(message, debug)
            elif output_type == 'json':
                return self.process_message(message)
            else:
                logger.error(f"Invalid output type: {output_type}")
                return None
            
        except Exception as e:
            logger.error(f"post_parsing_error: channel {channel}, post_id {post_id}, error {str(e)}")
            raise

    def _get_author_info(self, message: Message) -> str:
        if message.sender_chat:
            title = getattr(message.sender_chat, 'title', None)
            username = getattr(message.sender_chat, 'username', None)
            title = title.strip() if title else ''
            username = username.strip() if username else ''
            return f"{title} (@{username})" if username else title
        elif message.from_user:
            first = getattr(message.from_user, 'first_name', None)
            last = getattr(message.from_user, 'last_name', None)
            username = getattr(message.from_user, 'username', None)
            first = first.strip() if first else ''
            last = last.strip() if last else ''
            username = username.strip() if username else ''
            name = ' '.join(filter(None, [first, last]))
            return f"{name} (@{username})" if username else name
        return "Unknown author"

    def _generate_title(self, message: Message) -> str:
        # Check for "channel created" service message
        if getattr(message, "channel_chat_created", False):
            return "✨ Channel created"
        text = message.text or message.caption or ''
        
        # Check if the text contains only a URL and nothing else
        if text.strip():
            # Remove all URLs from text
            text_without_urls = re.sub(r'https?://[^\s<>"\']+', '', text.strip())
            if not text_without_urls:
                return "🔗 Web link"
            
        if not text:
            if   message.media == MessageMediaType.PHOTO:       return "📷 Photo"
            elif message.media == MessageMediaType.VIDEO:       return "🎥 Video"
            elif message.media == MessageMediaType.ANIMATION:   return "🎞 GIF"
            elif message.media == MessageMediaType.AUDIO:       return "🎵 Audio"
            elif message.media == MessageMediaType.VOICE:       return "🎤 Voice"
            elif message.media == MessageMediaType.VIDEO_NOTE:  return "📱 Video circle"
            elif message.media == MessageMediaType.STICKER:     return "🎯 Sticker"
            elif message.media == MessageMediaType.POLL:        return "📊 Poll"
            elif message.media == MessageMediaType.DOCUMENT:    
                if hasattr(message.document, 'mime_type') and message.document.mime_type == 'application/pdf': return "📄 Document"
                else: return "📎 Document"
            elif message.web_page:                              return "🔗 Web link"
            return "📷 Media post"

        # Remove URLs
        text = re.sub(r'http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\\(\\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+', '', text)
        # Remove HTML tags
        text = re.sub('<[^<]+?>', '', text)
        # Remove multiple spaces and empty lines
        text = '\n'.join(line.strip() for line in text.split('\n') if line.strip())

        # If after removing URLs and other formatting the text is empty,
        # and we have a web_page, set the title to "Web link"
        if not text.strip() and getattr(message, "web_page", None):
            return "🔗 Web link"

        # Get first non-empty line
        first_line = text.split('\n', maxsplit=1)[0] if text else ""
        
        max_length = 100
        if len(first_line) <= max_length:
            return first_line.strip()
        
        # Cut to last space
        trimmed = first_line[:max_length]
        last_space = trimmed.rfind(' ')
        if last_space > 0:
            trimmed = trimmed[:last_space]
        
        return f"{trimmed.strip()}..." if trimmed else ""

    def _format_forward_info(self, message: Message) -> Union[str, None]:
        if forward_from_chat := getattr(message, "forward_from_chat", None):
            forward_title = getattr(forward_from_chat, "title", "Unknown channel")
            forward_username = getattr(forward_from_chat, "username", None)
            if forward_username:
                forward_link = f'<a href="https://t.me/{forward_username}">{forward_title} (@{forward_username})</a>'
                return f'<div class="message-forward">Forwarded from {forward_link}</div><br>'
            return f'<div class="message-forward">Forwarded from {forward_title}</div><br>'
        
        elif forward_from := getattr(message, "forward_from", None):
            forward_name = f"{getattr(forward_from, 'first_name', '')} {getattr(forward_from, 'last_name', '')}".strip()
            forward_username = getattr(forward_from, "username", None)
            if forward_username:
                forward_link = f'<a href="https://t.me/{forward_username}">{forward_name} (@{forward_username})</a>'
                return f'<div class="message-forward">Forwarded from {forward_link}</div><br>'
            return f'<div class="message-forward">Forwarded from {forward_name}</div><br>'
        
        elif forward_sender_name := getattr(message, "forward_sender_name", None):
            return f'<div class="message-forward">Forwarded from {forward_sender_name}</div><br>'
        
        return None

    def _format_reply_info(self, message: Message) -> Union[str, None]:
        if getattr(message, "service", None) and 'PINNED_MESSAGE' in str(message.service) and (reply_to := getattr(message, "reply_to_message", None)):
            reply_text = reply_to.text or reply_to.caption or ''
            if len(reply_text) > 100:
                reply_text = reply_text[:100] + '...'
            return f'<div class="message-pinned">Pinned: {reply_text}</div><br>'
        
        if reply_to := getattr(message, "reply_to_message", None):
            reply_text = reply_to.text or reply_to.caption or ''
            if len(reply_text) > 100:
                reply_text = reply_text[:100] + '...'
            
            channel_username = getattr(reply_to.chat, "username", None)
            if channel_username:
                reply_link = f'<a href="https://t.me/{channel_username}/{reply_to.id}">#{reply_to.id}</a>'
                return f'<div class="message-reply">Reply to {reply_link}: {reply_text}</div><br>'
            return f'<div class="message-reply">Reply to #{reply_to.id}: {reply_text}</div><br>'
        
        return None
    
    def _extract_reactions(self, message: Message) -> Union[str, None]:
        if reactions := getattr(message, 'reactions', None):
            return {r.emoji: r.count for r in reactions.reactions}
        return None

    def _extract_flags(self, message: Message) -> List[str]:
        message_text = self._generate_html_body(message)
        flags = []

        # Add "fwd" flag for forwarded messages
        if (getattr(message, "forward_from_chat", None) or 
            getattr(message, "forward_from", None) or 
            getattr(message, "forward_sender_name", None)):
            flags.append("fwd")

        # Add flag "video" if the message media is VIDEO or ANIMATION and the body text is up to 100 characters.
        if (message.media in [MessageMediaType.VIDEO, MessageMediaType.ANIMATION] and 
            len((message.text or message.caption or '').strip()) <= 100):
            flags.append("video")
        
        # Add flag for posts without images
        if not message.media or message.media == MessageMediaType.POLL:
            flags.append("no_image")
        
        # Add flag for sticker messages
        if message.media == MessageMediaType.STICKER:
            flags.append("sticker")

        # Check if the message text contains variations of the word "стрим", "вебинар" 
        # or "онлайн-лекция" in a case-insensitive manner.
        if re.search(r'(?i)\b(стрим\w*|livestream|онлайн-лекци[яю]|вебинар\w*)\b', message_text):
            flags.append("stream")
        
        # Check if the message text contains the word "донат" in a case-insensitive manner.
        if re.search(r'(?i)\bдонат\w*\b', message_text):
            flags.append("donat")

        # Check if the post's reactions contain more clown emojis (🤡).
        if getattr(message, "reactions", None):
            for reaction in message.reactions.reactions:
                if reaction.emoji == "🤡" and reaction.count >= 30:
                    flags.append("clown")
                    break

        # Check if the post's reactions contain more poo emojis (💩).
        if getattr(message, "reactions", None):
            for reaction in message.reactions.reactions:
                if reaction.emoji == "💩" and reaction.count >= 30:
                    flags.append("poo")
                    break

        # Check if the message text contains "#реклама", "Партнерский пост", "по промокоду", "скидка на курс", "регистрируйтесь тут" in a case-insensitive manner.
        if re.search(r'(?i)(#реклама|#промо|О\s+рекламодателе|партнерский\s+пост|по\s+промокоду|erid|скидка\s+на\s+курс|регистрируйтесь\s+тут)', message_text):
            flags.append("advert")

        # Check if the message contains any http/https links in text or href attributes
        if re.search(r'https?://[^\s<>"\']+', message_text) or re.search(r'href=["\']https?://[^"\']+["\']', message_text):
            flags.append("link")

        # Check if the message contains channel mentions in the format @name
        if re.search(r'@[a-zA-Z][a-zA-Z0-9_]{3,}', message_text):
            flags.append("mention")

        try:
            # Find links with a '+' after t.me/ indicating a hidden channel link.
            hidden_links = re.findall(r'https?://(?:www\.)?t\.me/\+([A-Za-z0-9]+)', message_text)
            # Find links without a '+' after t.me/ indicating an open (foreign) channel link.
            open_links = re.findall(r'https?://(?:www\.)?t\.me/(?!\+)([A-Za-z0-9_]+)', message_text)
            if hidden_links:
                flags.append("hid_channel")

            current_channel = self.get_channel_username(message)
            # Add the flag "foreign_channel" if there's an open link that differs from the current channel.
            for open_link in open_links:
                if current_channel is None or open_link.lower() != current_channel.lower():
                    flags.append("foreign_channel")
                    break
        except Exception as e:
            logger.error(f"tme_link_extraction_error: message_id {message.id}, error {str(e)}")

        return flags

    def _format_html(self, message: Message, debug: bool = False) -> str:
        html_content = []
        data = self.process_message(message)['html']

        html_content.append(f'<div class="message-header">{data["header"]}</div>')
        html_content.append(f'<div class="message-media">{data["media"]}</div>')
        html_content.append(f'<div class="message-text">{data["body"]}</div>')
        html_content.append(f'<div class="message-footer">{data["footer"]}</div>')
        
        # Add raw JSON debug output if debug is enabled
        if debug:
            debug_json = json.dumps(message, indent=2, ensure_ascii=False, default=str)
            debug_json = debug_json.replace('\\n', '<br>').replace('\\"', '"')
            html_content.append(f'<pre class="debug-json" style="background: #f5f5f5; padding: 10px; margin-top: 20px; overflow-x: auto; font-size: 10px; white-space: pre-wrap;">{debug_json}</pre>')
        html_content = '\n'.join(html_content)
        return html_content

    def _format_flags(self, message: Message) -> str:
        if not Config['show_post_flags']:
            return ''
        
        flags = self._extract_flags(message)
        if flags:
            return f'<div class="message-flags">Flags: {", ".join(flags)}</div>'
        return ''

    def process_message(self, message: Message) -> Dict[Any, Any]:
        result = {
            'channel': self.get_channel_username(message),
            'message_id': message.id,
            'date': datetime.timestamp(message.date),
            'date_formatted': message.date.strftime('%Y-%m-%d %H:%M:%S'),
            'text': message.text or message.caption or '',
            'html': {
                'title': self._generate_title(message),
                'header': self._generate_html_header(message),
                'body': self._generate_html_body(message),
                'media': self._generate_html_media(message),
                'footer': self._generate_html_footer(message)
            },
            'flags': self._extract_flags(message),
            'author': self._get_author_info(message),
            'views': message.views,
            'reactions': self._extract_reactions(message),
            'media_group_id': message.media_group_id,
            'service': getattr(message, "service", None)
        }
        
        # Add webpage data if available
        if webpage := getattr(message, "web_page", None):
            result['webpage'] = {
                'type': getattr(webpage, 'type', None),
                'url': getattr(webpage, 'url', None),
                'display_url': getattr(webpage, 'display_url', None),
                'site_name': getattr(webpage, 'site_name', None),
                'title': getattr(webpage, 'title', None),
                'description': getattr(webpage, 'description', None),
                'has_large_media': getattr(webpage, 'has_large_media', False),
                'is_telegram_link': getattr(webpage, 'type', '') == 'telegram_message'
            }

        return result
    

    def _sanitize_html(self, html_raw: str) -> str:
        allowed_tags = ['p', 'a', 'b', 'i', 'strong', 'em', 'ul', 'ol', 'li', 'br', 'div', 'span', 'img', 'video', 'audio', 'source']
        allowed_attributes = {
            'a': ['href', 'title', 'target'],
            'img': {'src': True, 'alt': True, 'style': True},
            'video': {'controls': True, 'src': True, 'style': True},
            'audio': {'controls': True, 'style': True},
            'source': ['src', 'type'],
            'div': {'class': True, 'style': True},
            'span': ['class']
        }

        try:
            css_sanitizer = CSSSanitizer(
                allowed_css_properties=["max-width", "max-height", "object-fit", "width", "height"]
            )
            sanitized_html = HTMLSanitizer(
                html_raw,
                tags=allowed_tags,
                attributes=allowed_attributes,
                protocols=['http', 'https', 'tg'],
                css_sanitizer=css_sanitizer,
                strip=True,
            )
            return sanitized_html
        except Exception as e:
            logger.error(f"html_sanitization_error: {str(e)}")
            return html_raw

    def _generate_html_header(self, message: Message) -> str:
        content_header = []
        # Add forwarded from or reply info if present
        if forward_html := self._format_forward_info(message): content_header.append(forward_html)
        elif reply_html := self._format_reply_info(message): content_header.append(reply_html)
        html_header = '\n'.join(content_header)
        html_header = self._sanitize_html(html_header)
        return html_header

    def _generate_html_body(self, message: Message) -> str:
        content_body = []
        if message.text: text = message.text.html
        elif message.caption: text = message.caption.html
        else: text = ''

        text = text.replace('\n', '<br>') # Replace newlines with <br>
        text = self._add_hyperlinks_to_raw_urls(text)
        if text: # Message text
            content_body.append(f'<div class="message-text">{text}</div>')

        if poll := getattr(message, "poll", None): # Poll message
            if poll_html := self._format_poll(poll):
                content_body.append(poll_html)

        if getattr(message, "channel_chat_created", False): # Create service message for "channel created"
            content_body.append('<div class="message-service">Channel created</div>')

        html_body = '\n'.join(content_body)
        html_body = self._sanitize_html(html_body)
        return html_body

    def _generate_html_media(self, message: Message) -> str:
        self._save_media_file_ids(message) # Save media file_ids for caching

        content_media = []
        base_url = Config['pyrogram_bridge_url']
        if message.media and message.media != "MessageMediaType.POLL":
            file_unique_id = self._get_file_unique_id(message)
            if file_unique_id is None:
                logger.debug(f"File unique id not found for message {message.id}")
            elif file_unique_id:
                channel_username = self.get_channel_username(message)
                file = f"{channel_username}/{message.id}/{file_unique_id}"
                digest = generate_media_digest(file)
                url = f"{base_url}/media/{file}/{digest}"

                logger.debug(f"Collected media file: {channel_username}/{message.id}/{file_unique_id}")
                content_media.append(f'<div class="message-media">')
                
                # Check if document is a PDF file
                if message.media == MessageMediaType.DOCUMENT and hasattr(message.document, 'mime_type') and message.document.mime_type == 'application/pdf':
                    if channel_username.startswith('-100'): tg_link = f"https://t.me/c/{channel_username[4:]}/{message.id}"
                    else:  tg_link = f"https://t.me/{channel_username}/{message.id}"
                    content_media.append(f'<div class="document-pdf" style="padding: 10px;"><a href="{tg_link}" target="_blank">[PDF-файл]</a></div>')
                elif message.media in [MessageMediaType.PHOTO, MessageMediaType.DOCUMENT]:
                    content_media.append(f'<img src="{url}" style="max-width:100%; width:auto; height:auto; max-height:400px; object-fit:contain;">')
                elif message.media == MessageMediaType.VIDEO:
                    content_media.append(f'<video controls src="{url}" style="max-width:100%; width:auto; height:auto; max-height:400px;"></video>')
                elif message.media == MessageMediaType.ANIMATION:
                    content_media.append(f'<video controls src="{url}" style="max-width:100%; width:auto; height:auto; max-height:400px;"></video>')
                elif message.media == MessageMediaType.VIDEO_NOTE:
                    content_media.append(f'<video controls src="{url}" style="max-width:100%; width:auto; height:auto; max-height:400px;"></video>')
                elif message.media == MessageMediaType.AUDIO:
                    mime_type = getattr(message.audio, 'mime_type', 'audio/mpeg')
                    content_media.append(f'<audio controls style="width:100%; max-width:400px;"><source src="{url}" type="{mime_type}"></audio>')
                elif message.media == MessageMediaType.VOICE:
                    mime_type = getattr(message.voice, 'mime_type', 'audio/ogg')
                    content_media.append(f'<audio controls style="width:100%; max-width:400px;"><source src="{url}" type="{mime_type}"></audio>')
                elif message.media == MessageMediaType.STICKER:
                    emoji = getattr(message.sticker, 'emoji', '')
                    content_media.append(f'<img src="{url}" alt="Sticker {emoji}" style="max-width:100%; width:auto; height:auto; max-height:200px; object-fit:contain;">')
                content_media.append('</div>')
        
        if webpage := getattr(message, "web_page", None): # Web page preview
            if webpage_html := self._format_webpage(webpage, message):
                if len((message.text or message.caption or '').strip()) <= 10:
                    content_media.append(webpage_html)

        html_media = '\n'.join(content_media)
        html_media = self._sanitize_html(html_media)
        return html_media


    def _format_webpage(self, webpage, message) -> Union[str, None]:
        base_url = Config['pyrogram_bridge_url']
        try:
            # Check if this is a Telegram message link
            is_telegram_message = getattr(webpage, "type", "") == "telegram_message"
            
            if is_telegram_message:
                # Telegram message preview with distinctive styling
                html_parts = ['<div class="webpage-preview telegram-preview" style="border-left: 3px solid #0088cc; padding-left: 10px; margin: 10px 0; background-color: #f5fafd;">']
                html_parts.append(f'<div class="webpage-site" style="color:#0088cc; font-size:0.9em;">📱 Telegram</div>')
            else:
                # Regular webpage preview
                html_parts = ['<div class="webpage-preview" style="border-left: 3px solid #ccc; padding-left: 10px; margin: 10px 0;">']
                # Add site name if available
                if site_name := getattr(webpage, "site_name", None):
                    html_parts.append(f'<div class="webpage-site" style="color:#666; font-size:0.9em;">{site_name}</div>')
            
            # Add title with link if available
            if title := getattr(webpage, "title", None):
                url = getattr(webpage, "url", "#")
                html_parts.append(f'<div class="webpage-title" style="font-weight:bold; margin:5px 0;"><a href="{url}" target="_blank">{title}</a></div>')
            
            # Add description if available
            if description := getattr(webpage, "description", None):
                # Process the description to handle line breaks and possibly HTML
                processed_description = description.replace('\n', '<br>')
                processed_description = self._add_hyperlinks_to_raw_urls(processed_description)
                html_parts.append(f'<div class="webpage-description" style="margin:5px 0;">{processed_description}</div>')
            
            # Display URL for non-telegram links or when display_url is available
            if not is_telegram_message:
                display_url = getattr(webpage, "display_url", None)
                url = getattr(webpage, "url", None)
                if display_url:
                    html_parts.append(f'<div class="webpage-url" style="color:#666; font-size:0.9em; margin-bottom:5px;">{display_url}</div>')
                elif url:
                    html_parts.append(f'<div class="webpage-url" style="color:#666; font-size:0.9em; margin-bottom:5px;">{url}</div>')
            
            # Add photo if available
            if photo := getattr(webpage, "photo", None):
                if file_unique_id := getattr(photo, "file_unique_id", None):
                    channel_username = self.get_channel_username(message)
                    file = f"{channel_username}/{message.id}/{file_unique_id}"
                    digest = generate_media_digest(file)
                    url = f"{base_url}/media/{file}/{digest}"
                    html_parts.append(f'<div class="webpage-photo" style="margin-top:10px;"><a href="{webpage.url}" target="_blank">'
                                        f'<img src="{url}" style="max-width:100%; width:auto; height:auto; max-height:200px; object-fit:contain;"></a></div>')
            
            html_parts.append('</div>')
            return '\n'.join(html_parts)
        except Exception as e:
            logger.error(f"webpage_parsing_error: url {getattr(webpage, 'url', 'unknown')}, error {str(e)}")
            return None


    def _generate_html_footer(self, message: Message) -> str:
        content_footer = []
        if reactions_views_html := self._reactions_views_links(message):  # Add reactions, views, date and links
            content_footer.append(reactions_views_html)
        if flags_html := self._format_flags(message):  # Add flags
            content_footer.append(flags_html)
        html_footer = '\n'.join(content_footer)
        html_footer = self._sanitize_html(html_footer)
        return html_footer


    def _add_hyperlinks_to_raw_urls(self, text: str) -> str:
        try:
            a_tags = re.finditer(r'<a[^>]*>.*?</a>', text) # Find all existing <a> tags
            excluded_ranges = [(m.start(), m.end()) for m in a_tags] # Store their positions
            result = text
            offset = 0
            
            for match in re.finditer(r'https?://[^\s<>"\']+', text): # Find all URLs that are not already in HTML tags
                start, end = match.span()
                
                # Check if URL is inside an <a> tag
                is_in_tag = any(tag_start <= start and end <= tag_end for tag_start, tag_end in excluded_ranges)
                if not is_in_tag:
                    url = match.group()
                    replacement = f'<a href="{url}" target="_blank">{url}</a>'
                    
                    # Apply replacement considering offset
                    result = result[:start + offset] + replacement + result[end + offset:]
                    offset += len(replacement) - (end - start)
            
            return result
            
        except Exception as e:
            logger.error(f"url_processing_error: error {str(e)}")
            return text


    def _reactions_views_links(self, message: Message) -> Union[str, None]:
        try:
            parts = []
            
            reactions_html = ""
            views_html = ""
            if reactions := getattr(message, "reactions", None):
                for reaction in reactions.reactions:
                    # Replace None or empty emoji with replacement character
                    emoji = reaction.emoji
                    if emoji is None or emoji == "None" or emoji == "":
                        emoji = "�"  # Question mark as replacement for missing emojis
                    reactions_html += f'<span class="reaction">{emoji} {reaction.count}&nbsp;&nbsp;</span>'
                reactions_html = reactions_html.rstrip()

            if views := getattr(message, "views", None):
                views_html = f'<span class="views">{views} views</span>'

            # Combine reactions and views on the same line
            if reactions_html or views_html:
                parts.append(f'{reactions_html}&nbsp;&nbsp;{views_html}')

            # Add date and links on the same line
            second_line_parts = []
            
            # Format date as DD/MM/YY, HH:MM:SS
            if message.date:
                formatted_date = message.date.strftime("%d/%m/%y, %H:%M:%S")
                second_line_parts.append(formatted_date)

            # Add links
            channel_identifier = self.get_channel_username(message)
            if channel_identifier:
                links = []
                base_url = Config['pyrogram_bridge_url']
                
                if channel_identifier.startswith('-100'):  # For channels with only ID
                    channel_id = channel_identifier[4:]  # Remove '-100' prefix for web links
                    links.append(f'<a href="tg://resolve?domain=c/{channel_id}&post={message.id}">Open in Telegram</a>')
                    links.append(f'<a href="https://t.me/c/{channel_id}/{message.id}">Open in Web</a>')
                else:  # For channels with username
                    links.append(f'<a href="tg://resolve?domain={channel_identifier}&post={message.id}">Open in Telegram</a>')
                    links.append(f'<a href="https://t.me/{channel_identifier}/{message.id}">Open in Web</a>')
                if Config['show_bridge_link']:
                    token = Config['token']
                    links.append(f'<a href="{base_url}/html/{channel_identifier}/{message.id}?token={token}&debug=true">Open in Bridge</a>')
                second_line_parts.extend(links)

            if second_line_parts:
                parts.append('&nbsp;&nbsp;&nbsp;&nbsp;'.join(second_line_parts))

            result_html = '<br>'.join(parts) if parts else None
            return self._sanitize_html(result_html) if result_html else None
            
        except Exception as e:
            logger.error(f"reactions_views_parsing_error: {str(e)}")
            return None

    def _format_poll(self, poll) -> str:
        try:
            poll_text = f"📊 Poll: {poll.question}\n"
            if hasattr(poll, "options") and poll.options:
                for i, option in enumerate(poll.options, 1):
                    poll_text += f"{i}. {getattr(option, 'text', '')}\n"
            poll_text += "\n→ Vote in Telegram 🔗\n"
            return f'<div class="message-poll">{poll_text.replace(chr(10), "<br>")}</div>'
        except Exception as e:
            logger.error(f"poll_parsing_error: {str(e)}")
            return '<div class="message-poll">[Error displaying poll]</div>'

    def _get_file_unique_id(self, message: Message) -> Union[str, None]:
        try:
            media_mapping = {
                MessageMediaType.PHOTO: lambda m: m.photo.file_unique_id,
                MessageMediaType.VIDEO: lambda m: m.video.file_unique_id,
                MessageMediaType.DOCUMENT: lambda m: m.document.file_unique_id,
                MessageMediaType.AUDIO: lambda m: m.audio.file_unique_id,
                MessageMediaType.VOICE: lambda m: m.voice.file_unique_id,
                MessageMediaType.VIDEO_NOTE: lambda m: m.video_note.file_unique_id,
                MessageMediaType.ANIMATION: lambda m: m.animation.file_unique_id,
                MessageMediaType.STICKER: lambda m: m.sticker.file_unique_id,
                MessageMediaType.WEB_PAGE: lambda m: m.web_page.photo.file_unique_id if m.web_page and m.web_page.photo else None
            }
            
            if message.media in media_mapping:
                return media_mapping[message.media](message)
            
            return None
            
        except Exception as e:
            logger.error(f"file_id_extraction_error: media_type {message.media}, error {str(e)}")
            return None

    def _save_media_file_ids(self, message: Message) -> None:
        try:
            file_data = {
                'channel': None,
                'post_id': None,
                'file_unique_id': None,
                'added': None
            }

            channel_username = self.get_channel_username(message)
            if not channel_username:
                logger.error(f"channel_username_error: no username found for chat in message {message.id}")
                return

            if message.media:
                # Skip large videos - they shouldn't be cached permanently
                if message.video and message.video.file_size > 100 * 1024 * 1024: return
                
                if message.photo: file_data['file_unique_id'] = message.photo.file_unique_id
                elif message.video: file_data['file_unique_id'] = message.video.file_unique_id
                elif message.document: file_data['file_unique_id'] = message.document.file_unique_id
                elif message.audio: file_data['file_unique_id'] = message.audio.file_unique_id
                elif message.voice: file_data['file_unique_id'] = message.voice.file_unique_id
                elif message.video_note: file_data['file_unique_id'] = message.video_note.file_unique_id
                elif message.animation: file_data['file_unique_id'] = message.animation.file_unique_id
                elif message.sticker: file_data['file_unique_id'] = message.sticker.file_unique_id
                elif message.web_page and message.web_page.photo: file_data['file_unique_id'] = message.web_page.photo.file_unique_id

                if file_data['file_unique_id']:
                    file_data['channel'] = channel_username
                    file_data['post_id'] = message.id
                    file_data['added'] = datetime.now().timestamp()

                    file_path = os.path.join(os.path.abspath("./data"), 'media_file_ids.json')
                    try:
                        existing_data = []
                        if os.path.exists(file_path):
                            with open(file_path, 'r', encoding='utf-8') as f:
                                existing_data = json.load(f)
                        
                        # Check if file already exists by all three fields
                        found = False
                        for item in existing_data:
                            if (item.get('channel') == file_data['channel'] and 
                                item.get('post_id') == file_data['post_id'] and 
                                item.get('file_unique_id') == file_data['file_unique_id']):
                                item['added'] = datetime.now().timestamp()
                                found = True
                                break
                        
                        # Add new entry if not found
                        if not found:
                            existing_data.append(file_data)
                        
                        with open(file_path, 'w', encoding='utf-8') as f:
                            json.dump(existing_data, f, ensure_ascii=False, indent=2)

                    except Exception as e:
                        logger.error(f"file_id_save_error: error writing to {file_path}: {str(e)}")

        except Exception as e:
            logger.error(f"file_id_collection_error: message_id {message.id}, error {str(e)}")

    def get_channel_username(self, message):
        """Extract channel username or ID from message"""
        chat = message.chat if hasattr(message, 'chat') else message
        if not chat: return None
        
        # First try to get username
        if hasattr(chat, 'usernames') and chat.usernames: # Check many usernames
            active_usernames = [u.username for u in chat.usernames if u.active]
            if active_usernames:
                return active_usernames[0]
        if hasattr(chat, 'username') and chat.username: return chat.username # Check single username
        
        # Return numeric ID only if no username found
        if isinstance(chat.id, int) and str(chat.id).startswith('-100'): return str(chat.id)
        
        logger.error(f"channel_username_error: no username or valid ID found for chat")
        return None