from __future__ import annotations

import json
import time
from pathlib import Path
from typing import Any
from urllib import request

from config import BotConfig
from telegram_api import TelegramAPI


STATE_FILE = Path(__file__).resolve().parent.parent / ".new-qwen" / "telegram-state.json"


def load_state() -> dict[str, Any]:
    if not STATE_FILE.exists():
        return {"offset": None, "sessions": {}}
    return json.loads(STATE_FILE.read_text(encoding="utf-8"))


def save_state(state: dict[str, Any]) -> None:
    STATE_FILE.parent.mkdir(parents=True, exist_ok=True)
    STATE_FILE.write_text(json.dumps(state, ensure_ascii=False, indent=2), encoding="utf-8")


def post_json(url: str, payload: dict[str, Any]) -> dict[str, Any]:
    data = json.dumps(payload).encode("utf-8")
    req = request.Request(
        url,
        data=data,
        headers={"Content-Type": "application/json"},
        method="POST",
    )
    with request.urlopen(req, timeout=300) as response:
        return json.loads(response.read().decode("utf-8"))


def get_json(url: str) -> dict[str, Any]:
    with request.urlopen(url, timeout=60) as response:
        return json.loads(response.read().decode("utf-8"))


def ensure_auth(api: TelegramAPI, config: BotConfig, chat_id: int) -> bool:
    status = get_json(f"{config.server_url}/api/v1/auth/status")
    if status.get("authenticated"):
        return True
    started = post_json(f"{config.server_url}/api/v1/auth/device/start", {})
    api.send_message(
        chat_id,
        "Qwen OAuth не настроен.\n"
        f"Откройте ссылку:\n{started['verification_uri_complete']}\n\n"
        f"Потом отправьте /auth_check {started['flow_id']}",
    )
    return False


def handle_message(api: TelegramAPI, config: BotConfig, state: dict[str, Any], message: dict[str, Any]) -> None:
    chat_id = message["chat"]["id"]
    user_id = str(message.get("from", {}).get("id", chat_id))
    text = (message.get("text") or "").strip()
    if not text:
        api.send_message(chat_id, "Поддерживаются только текстовые сообщения.")
        return

    session_key = f"{chat_id}:{user_id}"
    session_id = state.setdefault("sessions", {}).get(session_key)

    if text == "/start":
        api.send_message(chat_id, "new-qwen bot готов. Команды: /auth, /clear.")
        return

    if text == "/auth":
        started = post_json(f"{config.server_url}/api/v1/auth/device/start", {})
        api.send_message(
            chat_id,
            "Откройте ссылку для авторизации Qwen OAuth:\n"
            f"{started['verification_uri_complete']}\n\n"
            f"После подтверждения отправьте /auth_check {started['flow_id']}",
        )
        return

    if text.startswith("/auth_check"):
        parts = text.split(maxsplit=1)
        if len(parts) != 2:
            api.send_message(chat_id, "Использование: /auth_check <flow_id>")
            return
        result = post_json(
            f"{config.server_url}/api/v1/auth/device/poll",
            {"flow_id": parts[1]},
        )
        if result.get("done"):
            api.send_message(chat_id, "Qwen OAuth успешно настроен.")
        else:
            api.send_message(chat_id, "Авторизация ещё не завершена. Повторите команду через пару секунд.")
        return

    if text == "/clear":
        if session_id:
            post_json(f"{config.server_url}/api/v1/session/clear", {"session_id": session_id})
            state["sessions"].pop(session_key, None)
        api.send_message(chat_id, "Контекст сессии очищен.")
        return

    if not ensure_auth(api, config, chat_id):
        return

    api.send_message(chat_id, "Обрабатываю запрос...")
    result = post_json(
        f"{config.server_url}/api/v1/chat",
        {
            "session_id": session_id,
            "user_id": user_id,
            "message": text,
        },
    )
    state["sessions"][session_key] = result["session_id"]
    answer = result.get("answer") or "Пустой ответ от модели."
    api.send_message(chat_id, answer[:4000])


def main() -> None:
    config = BotConfig.load()
    api = TelegramAPI(config.token)
    state = load_state()
    print("new-qwen bot polling started")
    while True:
        try:
            updates = api.get_updates(state.get("offset"), config.poll_timeout)
            for update in updates:
                state["offset"] = update["update_id"] + 1
                message = update.get("message")
                if message:
                    handle_message(api, config, state, message)
                save_state(state)
        except Exception as exc:
            print(f"bot loop error: {exc}")
            time.sleep(3)


if __name__ == "__main__":
    main()