File Handling

async def upload_file(
    self,
    file,
    *,
    part_size_kb: int = None,
    file_name: str = None,
    use_cache: bool = True,
    progress_callback=None
) -> Union[types.InputFile, types.InputFileBig]:
    """
    Upload a file to Telegram servers for later use.
    
    Parameters:
    - file: File path, bytes, or file-like object to upload
    - part_size_kb: Upload chunk size in KB (auto-determined if None)
    - file_name: Name for the file (auto-detected if None)
    - use_cache: Use cached upload if file already uploaded
    - progress_callback: Callback for upload progress updates
    
    Returns:
    InputFile or InputFileBig object for use in other methods
    
    Progress callback signature:
    def callback(current_bytes: int, total_bytes: int):
        percent = current_bytes / total_bytes * 100
        print(f"Uploaded {percent:.1f}%")
    """

async def send_file(
    self,
    entity,
    file,
    *,
    caption: str = '',
    force_document: bool = False,
    clear_draft: bool = False,
    parse_mode=(),
    thumb=None,
    reply_to=None,
    attributes=None,
    allow_cache: bool = True,
    voice_note: bool = False,
    video_note: bool = False,
    buttons=None,
    silent: bool = None,
    background: bool = None,
    supports_streaming: bool = False,
    schedule=None,
    comment_to=None,
    ttl: int = None,
    file_name: str = None,
    mime_type: str = None,
    thumb_file_name: str = None,
    progress_callback=None,
    nosound_video: bool = False
) -> types.Message:
    """
    Send a file as a message to an entity.
    
    Parameters:
    - entity: Target chat, channel, or user
    - file: File path, bytes, URL, or InputFile object
    - caption: Text caption for the file
    - force_document: Send as document instead of media
    - clear_draft: Clear draft after sending
    - parse_mode: Caption formatting ('md', 'html')
    - thumb: Custom thumbnail file
    - reply_to: Message to reply to
    - attributes: Custom file attributes
    - allow_cache: Use cached upload if available
    - voice_note: Send as voice message
    - video_note: Send as video note (circular video)
    - buttons: Inline keyboard buttons
    - silent: Send without notification
    - background: Send in background (channels)
    - supports_streaming: Enable streaming for videos
    - schedule: Schedule for later delivery
    - comment_to: Reply in channel comments
    - ttl: Self-destruct timer in seconds
    - file_name: Override detected file name
    - mime_type: Override detected MIME type
    - thumb_file_name: Thumbnail file name
    - progress_callback: Upload progress callback
    - nosound_video: Mark video as having no sound
    
    Returns:
    Message object containing the sent file
    
    Raises:
    - FilePartMissingError: If upload incomplete
    - MediaInvalidError: If file format unsupported
    - FileTooLargeError: If file exceeds size limits
    """

async def download_file(
    self,
    input_location,
    file=None,
    *,
    part_size_kb: int = None,
    file_size: int = None,
    progress_callback=None,
    dc_id: int = None,
    key=None,
    iv=None
) -> bytes:
    """
    Download a file from Telegram servers.
    
    Parameters:
    - input_location: InputFileLocation or similar object
    - file: Output file path or file-like object (None for bytes)
    - part_size_kb: Download chunk size in KB
    - file_size: Expected file size for progress tracking
    - progress_callback: Download progress callback
    - dc_id: Specific datacenter ID to use
    - key: Decryption key for encrypted files
    - iv: Initialization vector for encrypted files
    
    Returns:
    bytes: File contents if file=None, otherwise None
    
    Progress callback signature:
    def callback(current_bytes: int, total_bytes: int):
        percent = current_bytes / total_bytes * 100
        print(f"Downloaded {percent:.1f}%")
    """

async def download_media(
    self,
    message,
    file=None,
    *,
    thumb: Union[int, types.TypePhotoSize] = None,
    progress_callback=None
) -> str:
    """
    Download media from a message.
    
    Parameters:
    - message: Message object containing media
    - file: Output file path (auto-generated if None)
    - thumb: Download specific thumbnail size
    - progress_callback: Download progress callback
    
    Returns:
    str: Path to downloaded file
    
    Raises:
    - MediaEmptyError: If message has no media
    - FileReferenceExpiredError: If file reference expired
    """

async def download_profile_photo(
    self,
    entity,
    file=None,
    *,
    download_big: bool = True,
    thumb: int = None
) -> str:
    """
    Download profile photo of a user or chat.
    
    Parameters:
    - entity: User, chat, or channel
    - file: Output file path (auto-generated if None)
    - download_big: Download high resolution version
    - thumb: Download specific thumbnail (-1 for big, 0 for small)
    
    Returns:
    str: Path to downloaded profile photo
    """

def iter_download(
    self,
    file,
    *,
    offset: int = 0,
    stride: int = None,
    limit: int = None,
    chunk_size: int = None,
    request_size: int = None,
    file_size: int = None,
    dc_id: int = None
):
    """
    Iterate over file chunks for streaming download.
    
    Parameters:
    - file: InputFileLocation or message with media
    - offset: Start downloading from this byte offset
    - stride: Download every nth chunk (for sampling)
    - limit: Maximum number of chunks to download
    - chunk_size: Size of each chunk in bytes
    - request_size: Size of each API request in bytes
    - file_size: Total file size for optimization
    - dc_id: Specific datacenter to use
    
    Yields:
    bytes: File chunks in order
    
    Usage:
    async for chunk in client.iter_download(message.media):
        # Process chunk (save to file, analyze, etc.)
        process_chunk(chunk)
    """

def get_attributes(
    file,
    *,
    mime_type: str = None,
    attributes: List = None,
    force_document: bool = False,
    voice_note: bool = False,
    video_note: bool = False,
    supports_streaming: bool = False,
    **kwargs
) -> List[types.TypeDocumentAttribute]:
    """
    Generate appropriate attributes for a file upload.
    
    Parameters:
    - file: File object or path
    - mime_type: Override MIME type
    - attributes: Custom attributes list
    - force_document: Force document attributes
    - voice_note: Add voice message attributes
    - video_note: Add video note attributes
    - supports_streaming: Add streaming support
    
    Returns:
    List of DocumentAttribute objects
    """

import asyncio
from telethon import TelegramClient

async def basic_file_operations():
    client = TelegramClient('session', api_id, api_hash)
    await client.start()
    
    chat = 'username'
    
    # Send a photo
    await client.send_file(chat, 'photo.jpg', caption='Check out this photo!')
    
    # Send a document
    await client.send_file(
        chat, 
        'document.pdf',
        force_document=True,
        caption='Important document'
    )
    
    # Send from URL
    await client.send_file(
        chat,
        'https://example.com/image.jpg',
        caption='Image from URL'
    )
    
    # Send voice note
    await client.send_file(
        chat,
        'audio.mp3',
        voice_note=True
    )
    
    await client.disconnect()

asyncio.run(basic_file_operations())

async def upload_with_progress():
    client = TelegramClient('session', api_id, api_hash)
    await client.start()
    
    def progress_callback(current, total):
        percent = current / total * 100
        print(f"\rUpload progress: {percent:.1f}%", end='', flush=True)
    
    # Upload large file with progress tracking
    await client.send_file(
        'username',
        'large_video.mp4',
        caption='Large video file',
        progress_callback=progress_callback,
        supports_streaming=True
    )
    
    print("\nUpload complete!")
    await client.disconnect()

import os

async def download_files():
    client = TelegramClient('session', api_id, api_hash)
    await client.start()
    
    chat = 'username'
    
    def download_progress(current, total):
        percent = current / total * 100
        print(f"\rDownload progress: {percent:.1f}%", end='', flush=True)
    
    # Download media from recent messages
    async for message in client.iter_messages(chat, limit=10):
        if message.media:
            # Download to specific file
            file_path = await client.download_media(
                message,
                file=f"downloads/{message.id}",
                progress_callback=download_progress
            )
            print(f"\nDownloaded: {file_path}")
            
            # Get file info
            file_size = os.path.getsize(file_path)
            print(f"File size: {file_size} bytes")
    
    await client.disconnect()

async def stream_large_file():
    client = TelegramClient('session', api_id, api_hash)
    await client.start()
    
    # Get a message with large media
    async for message in client.iter_messages('username', limit=50):
        if message.media and hasattr(message.media, 'document'):
            doc = message.media.document
            if doc.size > 10 * 1024 * 1024:  # > 10MB
                print(f"Streaming file: {doc.size} bytes")
                
                # Stream download to file
                with open('streamed_file.bin', 'wb') as f:
                    async for chunk in client.iter_download(message.media):
                        f.write(chunk)
                        print(f"Downloaded {f.tell()} bytes", end='\r')
                
                print(f"\nStreaming complete!")
                break
    
    await client.disconnect()

from telethon.tl.types import DocumentAttributeFilename, DocumentAttributeVideo
import mimetypes

async def advanced_file_handling():
    client = TelegramClient('session', api_id, api_hash)
    await client.start()
    
    # Send file with custom attributes
    custom_attributes = [
        DocumentAttributeFilename(file_name='custom_name.mp4'),
        DocumentAttributeVideo(
            duration=120,  # 2 minutes
            w=1920,        # 1920px width
            h=1080,        # 1080px height
            supports_streaming=True
        )
    ]
    
    await client.send_file(
        'username',
        'video.mp4',
        attributes=custom_attributes,
        thumb='thumbnail.jpg',  # Custom thumbnail
        caption='Video with custom attributes'
    )
    
    # Pre-upload file for multiple uses
    uploaded_file = await client.upload_file('document.pdf')
    
    # Use pre-uploaded file multiple times
    await client.send_file('user1', uploaded_file, caption='For user 1')
    await client.send_file('user2', uploaded_file, caption='For user 2')
    
    # Download profile photos
    async for dialog in client.iter_dialogs(limit=10):
        if dialog.entity.photo:
            photo_path = await client.download_profile_photo(
                dialog.entity,
                file=f'profiles/{dialog.id}_profile.jpg'
            )
            print(f"Downloaded profile photo: {photo_path}")
    
    await client.disconnect()

from telethon import utils

async def file_type_detection():
    client = TelegramClient('session', api_id, api_hash)
    await client.start()
    
    # Check recent media messages
    async for message in client.iter_messages('username', limit=20):
        if message.media:
            print(f"Message {message.id}:")
            
            # Check media type
            if utils.is_image(message.media):
                print("  - Type: Image")
            elif utils.is_video(message.media):
                print("  - Type: Video")
            elif utils.is_audio(message.media):
                print("  - Type: Audio")
            elif utils.is_gif(message.media):
                print("  - Type: GIF")
            else:
                print("  - Type: Document")
            
            # Get file extension
            extension = utils.get_extension(message.media)
            print(f"  - Extension: {extension}")
    
    await client.disconnect()

from typing import Union, List, Optional, Callable, BinaryIO
from telethon.tl import types
import io

FileLike = Union[str, bytes, BinaryIO, io.IOBase]
ProgressCallback = Callable[[int, int], None]
AttributeList = List[types.TypeDocumentAttribute]

class InputSizedFile:
    """File input with size information"""
    file: types.InputFile
    size: int
    name: str
    
class UploadProgress:
    """Upload progress information"""
    current: int
    total: int
    percentage: float