from __future__ import annotations

from typing import Any


def parse_telegram_target(target: str) -> dict[str, Any] | None:
    target = target.strip()

    if target.startswith("tg://"):
        target = target[5:]
    elif target.startswith("tg:"):
        target = target[3:]
    elif target.startswith("telegram://"):
        target = target[11:]
    elif target.startswith("telegram:"):
        target = target[9:]

    if target.lstrip("-").isdigit():
        return {"chat_id": target, "type": "chat_id"}

    if target.startswith("@"):
        return {"username": target[1:], "type": "username"}

    return None


def parse_messaging_target(target: str) -> dict[str, Any] | None:
    parts = target.split("/")
    if len(parts) >= 2:
        chat_part = parse_telegram_target(parts[0])
        if chat_part and parts[1].isdigit():
            return {**chat_part, "thread_id": parts[1]}
    return parse_telegram_target(target)


def normalize_telegram_chat_id(chat_id: str | int) -> str:
    return str(chat_id).removeprefix("-100")


def normalize_telegram_target(target: str) -> str:
    parsed = parse_telegram_target(target)
    if not parsed:
        return target
    if "chat_id" in parsed:
        return f"tg:{normalize_telegram_chat_id(parsed['chat_id'])}"
    elif "username" in parsed:
        return f"tg:@{parsed['username']}"
    return target