from __future__ import annotations

import json
import time
from pathlib import Path
from typing import Any
from urllib import error, 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": {}, "auth_flows": {}}
    state = json.loads(STATE_FILE.read_text(encoding="utf-8"))
    state.setdefault("sessions", {})
    state.setdefault("auth_flows", {})
    return state


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 send_text_chunks(api: TelegramAPI, chat_id: int, text: str) -> None:
    normalized = text or "Пустой ответ."
    chunk_size = 3800
    for start in range(0, len(normalized), chunk_size):
        api.send_message(chat_id, normalized[start : start + chunk_size])


def summarize_event(event: dict[str, Any]) -> str | None:
    event_type = event.get("type")
    if event_type == "job_status":
        return event.get("message")
    if event_type == "model_request":
        return "Думаю над ответом"
    if event_type == "tool_call":
        return f"Вызываю инструмент: {event.get('name')}"
    if event_type == "tool_result":
        result = event.get("result", {})
        if isinstance(result, dict) and "error" in result:
            return f"Инструмент {event.get('name')} завершился с ошибкой"
        return f"Инструмент {event.get('name')} завершён"
    if event_type == "error":
        return f"Ошибка: {event.get('message')}"
    return None


def get_auth_flow(state: dict[str, Any], chat_id: int) -> dict[str, Any] | None:
    return state.setdefault("auth_flows", {}).get(str(chat_id))


def start_auth_flow(
    api: TelegramAPI,
    config: BotConfig,
    state: dict[str, Any],
    chat_id: int,
    *,
    force_new: bool = False,
) -> dict[str, Any]:
    existing = get_auth_flow(state, chat_id)
    now = time.time()
    if existing and not force_new and existing.get("expires_at", 0) > now:
        send_text_chunks(
            api,
            chat_id,
            "Авторизация Qwen OAuth ещё не завершена.\n"
            f"Открой ссылку:\n{existing['verification_uri_complete']}\n\n"
            "Бот сам проверит завершение и продолжит работу.",
        )
        return existing

    started = post_json(f"{config.server_url}/api/v1/auth/device/start", {})
    flow = {
        "flow_id": started["flow_id"],
        "user_code": started.get("user_code"),
        "verification_uri": started.get("verification_uri"),
        "verification_uri_complete": started["verification_uri_complete"],
        "expires_at": started["expires_at"],
        "interval_seconds": started.get("interval_seconds", 2),
        "next_poll_at": now + started.get("interval_seconds", 2),
        "pending_messages": existing.get("pending_messages", []) if existing else [],
    }
    state.setdefault("auth_flows", {})[str(chat_id)] = flow
    send_text_chunks(
        api,
        chat_id,
        "Нужна авторизация Qwen OAuth.\n"
        f"Открой ссылку:\n{flow['verification_uri_complete']}\n\n"
        f"user_code: {flow.get('user_code')}\n"
        "После подтверждения бот сам продолжит работу.",
    )
    return flow


def ensure_auth(api: TelegramAPI, config: BotConfig, state: dict[str, Any], chat_id: int) -> bool:
    status = get_json(f"{config.server_url}/api/v1/auth/status")
    if status.get("authenticated"):
        return True
    start_auth_flow(api, config, state, chat_id)
    return False


def enqueue_pending_message(
    state: dict[str, Any],
    chat_id: int,
    user_id: str,
    session_key: str,
    text: str,
) -> None:
    flow = get_auth_flow(state, chat_id)
    if not flow:
        return
    pending_messages = flow.setdefault("pending_messages", [])
    pending_messages.append(
        {
            "user_id": user_id,
            "session_key": session_key,
            "text": text,
            "created_at": int(time.time()),
        }
    )


def deliver_chat_message(
    api: TelegramAPI,
    config: BotConfig,
    state: dict[str, Any],
    chat_id: int,
    user_id: str,
    session_key: str,
    text: str,
    *,
    delayed: bool = False,
) -> None:
    session_id = state.setdefault("sessions", {}).get(session_key)
    prefix = "Обрабатываю отложенный запрос..." if delayed else "Обрабатываю запрос..."
    api.send_message(chat_id, prefix)
    start_result = post_json(
        f"{config.server_url}/api/v1/chat/start",
        {
            "session_id": session_id,
            "user_id": user_id,
            "message": text,
        },
    )
    state["sessions"][session_key] = start_result["session_id"]
    job_id = start_result["job_id"]
    seen_seq = 0
    sent_statuses: set[str] = set()
    answer = None
    while True:
        poll_result = post_json(
            f"{config.server_url}/api/v1/chat/poll",
            {"job_id": job_id, "since_seq": seen_seq},
        )
        for event in poll_result.get("events", []):
            seen_seq = max(seen_seq, int(event.get("seq", 0)))
            summary = summarize_event(event)
            if summary and summary not in sent_statuses:
                api.send_message(chat_id, summary[:4000])
                sent_statuses.add(summary)
        if poll_result.get("status") == "completed":
            answer = poll_result.get("answer")
            state["sessions"][session_key] = poll_result["session_id"]
            break
        if poll_result.get("status") == "failed":
            raise RuntimeError(poll_result.get("error") or "Chat job failed")
        time.sleep(1.2)

    answer = answer or "Пустой ответ от модели."
    send_text_chunks(api, chat_id, answer)


def poll_auth_flow(
    api: TelegramAPI,
    config: BotConfig,
    state: dict[str, Any],
    chat_id: int,
    *,
    force: bool = False,
) -> bool:
    flow = get_auth_flow(state, chat_id)
    if not flow:
        return False
    now = time.time()
    if flow.get("expires_at", 0) <= now:
        state["auth_flows"].pop(str(chat_id), None)
        api.send_message(chat_id, "OAuth flow истёк. Запусти /auth ещё раз.")
        return False
    if not force and now < flow.get("next_poll_at", 0):
        return False

    try:
        result = post_json(
            f"{config.server_url}/api/v1/auth/device/poll",
            {"flow_id": flow["flow_id"]},
        )
    except error.HTTPError as exc:
        body = exc.read().decode("utf-8", errors="replace")
        state["auth_flows"].pop(str(chat_id), None)
        send_text_chunks(
            api,
            chat_id,
            "Не удалось завершить OAuth flow на сервере.\n"
            f"Ответ сервера: {body}\n"
            "Запусти /auth ещё раз.",
        )
        return False

    if not result.get("done"):
        interval = result.get("interval_seconds", flow.get("interval_seconds", 2))
        flow["interval_seconds"] = interval
        flow["next_poll_at"] = now + interval
        return False

    state["auth_flows"].pop(str(chat_id), None)
    api.send_message(chat_id, "Qwen OAuth успешно настроен.")
    for item in flow.get("pending_messages", []):
        deliver_chat_message(
            api,
            config,
            state,
            chat_id,
            item["user_id"],
            item["session_key"],
            item["text"],
            delayed=True,
        )
    if not flow.get("pending_messages"):
        api.send_message(chat_id, "Можно отправлять обычные сообщения.")
    return True


def process_auth_flows(
    api: TelegramAPI,
    config: BotConfig,
    state: dict[str, Any],
) -> None:
    for chat_id_raw in list(state.setdefault("auth_flows", {}).keys()):
        try:
            poll_auth_flow(api, config, state, int(chat_id_raw), force=False)
        except Exception as exc:
            print(f"auth flow poll error for chat {chat_id_raw}: {exc}")


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)
    state.setdefault("auth_flows", {})

    if text == "/start":
        api.send_message(
            chat_id,
            "new-qwen bot готов.\nКоманды: /help, /auth, /status, /session, /clear.",
        )
        return

    if text == "/help":
        api.send_message(
            chat_id,
            "Команды:\n"
            "/auth - начать Qwen OAuth\n"
            "/auth_check [flow_id] - проверить авторизацию\n"
            "/status - статус OAuth и сервера\n"
            "/session - показать текущую сессию\n"
            "/clear - очистить контекст",
        )
        return

    if text == "/auth":
        start_auth_flow(api, config, state, chat_id, force_new=True)
        return

    if text.startswith("/auth_check"):
        parts = text.split(maxsplit=1)
        if len(parts) == 2:
            flow = get_auth_flow(state, chat_id)
            if flow:
                flow["flow_id"] = parts[1]
        flow = get_auth_flow(state, chat_id)
        if not flow:
            api.send_message(chat_id, "Нет активного flow_id. Сначала вызови /auth.")
            return
        if not poll_auth_flow(api, config, state, chat_id, force=True):
            api.send_message(chat_id, "Авторизация ещё не завершена. Повторите команду через пару секунд.")
        return

    if text == "/status":
        status = get_json(f"{config.server_url}/api/v1/auth/status")
        send_text_chunks(
            api,
            chat_id,
            "Сервер доступен.\n"
            f"OAuth: {'configured' if status.get('authenticated') else 'not configured'}\n"
            f"resource_url: {status.get('resource_url')}\n"
            f"expires_at: {status.get('expires_at')}",
        )
        return

    if text == "/session":
        if not session_id:
            api.send_message(chat_id, "У этого чата ещё нет активной сессии.")
            return
        session = post_json(
            f"{config.server_url}/api/v1/session/get",
            {"session_id": session_id},
        )
        send_text_chunks(
            api,
            chat_id,
            "session_id: {session_id}\nmessages: {count}\nlast_answer: {last_answer}".format(
                session_id=session_id,
                count=len(session.get("messages", [])),
                last_answer=session.get("last_answer") or "-",
            ),
        )
        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, state, chat_id):
        enqueue_pending_message(state, chat_id, user_id, session_key, text)
        api.send_message(chat_id, "Сообщение поставлено в очередь до завершения авторизации.")
        return

    deliver_chat_message(api, config, state, chat_id, user_id, session_key, text)


def main() -> None:
    config = BotConfig.load()
    api = TelegramAPI(config.token)
    state = load_state()
    print("new-qwen bot polling started")
    while True:
        try:
            process_auth_flows(api, config, state)
            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)
            save_state(state)
        except Exception as exc:
            print(f"bot loop error: {exc}")
            time.sleep(3)


if __name__ == "__main__":
    main()