from __future__ import annotations

import json
from typing import Any
from urllib import parse, request as urllib_request


class TelegramAPI:
    def __init__(self, token: str, proxy_url: str | None = None) -> None:
        self.base_url = f"https://api.telegram.org/bot{token}"
        handlers = []
        if proxy_url:
            handlers.append(urllib_request.ProxyHandler({"https": proxy_url, "http": proxy_url}))
        self.opener = urllib_request.build_opener(*handlers) if handlers else urllib_request.build_opener()

    def _post(self, method: str, payload: dict[str, Any]) -> dict[str, Any]:
        data = json.dumps(payload).encode("utf-8")
        req = urllib_request.Request(
            f"{self.base_url}/{method}",
            data=data,
            headers={"Content-Type": "application/json"},
            method="POST",
        )
        with self.opener.open(req, timeout=90) as response:
            return json.loads(response.read().decode("utf-8"))

    def _get(self, method: str, params: dict[str, Any]) -> dict[str, Any]:
        query = parse.urlencode(params)
        with self.opener.open(f"{self.base_url}/{method}?{query}", timeout=90) as response:
            return json.loads(response.read().decode("utf-8"))

    def get_updates(self, offset: int | None, timeout: int) -> list[dict[str, Any]]:
        params: dict[str, Any] = {"timeout": timeout}
        if offset is not None:
            params["offset"] = offset
        response = self._get("getUpdates", params)
        return response.get("result", [])

    def send_message(self, chat_id: int, text: str) -> None:
        self._post("sendMessage", {"chat_id": chat_id, "text": text})