"""This is an improved version of get_chat_members.py

Since Telegram will return at most 10.000 members for a single query, this script
repeats the search using numbers ("0" to "9") and all the available ascii letters ("a" to "z").

This can be further improved by also searching for non-ascii characters (e.g.: Japanese script),
as some user names may not contain ascii letters at all.
"""

import time
from string import ascii_lowercase

from pyrogram import Client
from pyrogram.api.errors import FloodWait

app = Client("my_account")

target = "pyrogramchat"  # Target channel/supergroup
members = {}  # List that will contain all the members of the target chat
limit = 200  # Amount of users to retrieve for each API call (max 200)

# "" + "0123456789" + "abcdefghijklmnopqrstuvwxyz" (as list)
queries = [""] + [str(i) for i in range(10)] + list(ascii_lowercase)

with app:
    for q in queries:
        print('Searching for "{}"'.format(q))
        offset = 0  # For each query, offset restarts from 0

        while True:
            try:
                chunk = app.get_chat_members(target, offset, query=q)
            except FloodWait as e:  # Very large chats could trigger FloodWait
                print("Flood wait: {} seconds".format(e.x))
                time.sleep(e.x)  # When it happens, wait X seconds and try again
                continue

            if not chunk.chat_members:
                print('Done searching for "{}"'.format(q))
                print()
                break  # No more members left

            members.update({i.user.id: i for i in chunk.chat_members})
            offset += len(chunk.chat_members)

            print("Total members: {}".format(len(members)))

    print("Grand total: {}".format(len(members)))

# Now the "members" list contains all the members of the target chat